Class / Patent application number | Description | Number of patent applications / Date published |
375356000 | Network synchronizing more than two stations | 77 |
20080205567 | Methods and Receives of Data Transmission Using Clock Domains - A receiver (RCV) for receiving data from a transmitter, comprises a first clock domain operating at a data rate synchronous with a clock of the transmitter, and having an input (RI) for receiving data. The data includes primary data, secondary data and control data. The receiver further has a second clock domain operating at a clock rate independent from the transmitter, and a clock-domain crossing unit for transferring data from the first to the second clock domain. The receiver further includes a slot counter for counting a number of units of received data converted by the clock-domain crossing unit into the second clock domain, a first identification unit (PRIM) for identifying control data indicative for the presence of primary and secondary data and a second identification unit (PAUSE) for identifying control data indicative whether slot counter of the receiver will be updated or not. It has an output (RO) for communicating an indicator indicative for the value of the slot counter. The receiver cooperates with a transmitter comprising a unit (M | 08-28-2008 |
20080212728 | METHOD AND APPARATUS FOR GENERATING CLOCKS FOR A HANDHELD MULTISTANDARD COMMUNICATION SYSTEM - Systems and methods for processing signals are disclosed. The method may include, in a communication system comprising a plurality of devices, controlling the supply of one or more clock signals from a first clock source to one or more of the plurality of devices based on a signal communicated from a particular one of the plurality of devices to a second clock source and a request for a clock signal from one of the plurality of devices. The communicated signal may control an accuracy of the second clock source. The particular one of the plurality of devices may have highest accuracy requirements among the plurality of devices. At least one main clock signal may be generated for at least one of the plurality of devices utilizing an input clock signal received from the second clock source. | 09-04-2008 |
20080219391 | Systems and Methods for Distributing a Clock Signal - One embodiment of the present invention includes a distributed clock system. The distributed clock system includes a clock transmitter configured to programmably amplify and transmit a sine-wave signal corresponding to a clock signal, and a clock receiver configured to receive the sine-wave signal and to convert the sine-wave signal into a square-wave clock signal. | 09-11-2008 |
20080232525 | Network system and audio signal processor - An audio network system that performs transport of audio signals among nodes by cascading a plurality of nodes each including two sets of transmission I/Fs and reception I/Fs, and circulating among the nodes in each fixed period an audio transport frame generated by a master node, the audio transport frame including a plurality of storage regions for audio signals, is configured such that the master node measures time periods Dfw and Dbw after the audio transport frame is transmitted until the audio transport frame returns to the master node after passing through the transmission route and writes them into the audio transport frame, and each of the other nodes generates a signal processing wordclock based on those time periods, two reception times Tr | 09-25-2008 |
20080240321 | Aligning Timebases to Share Synchronized Periodic Signals - A system and method for aligning a local timebase to a remote timebase given a timebase error value from a higher-level protocol, and using the aligned timebases to generate and distribute synchronized events and synchronized adjustable frequency periodic signals across a domain using the aligned timebases. Slightly speeding up or slowing down a periodic signal used to count time, a local timebase may be aligned to a remote timebase when given an error value from a higher-level protocol. A device may be configured to begin generating a periodic waveform at an agreed upon time in the future, once the timebases are aligned, where the time may be synchronized to remote devices via a synchronization protocol and an alignment mechanism. Remote periodic signals may remain synchronized to each other as long as the higher-level protocol and timebase alignment algorithm keep the timebases aligned. A common reference periodic signal may be shared between all devices, and the reference periodic signal or a conditioned version of the reference periodic signal may be specified as the periodic signal to control the operation of the timebase circuitry. The common reference periodic signal may improve synchronization performance beyond the capabilities of the higher-level protocol, and may in addition provide means for synchronization fault tolerance. | 10-02-2008 |
20080240322 | Communication controller and method for saving power in transmitting and receiving - A communication controller mounted on a node includes a data communicator transmitting a data signal, a transmission cycle information decider deciding transmission cycle information of that node on the basis of occurrence frequency of traffic, and a timing control signal receiver receiving a timing control signal. The timing control signal is indicative of a communication timing of the node. The communication controller further includes a communication timing calculator calculating a communication timing of that node in response to reception of the timing control signal, a timing control signal transmitter transmitting a merged signal of a timing control signal and the transmission cycle information to neighboring nodes, and a transmission-reception interruption controller determining whether or not to interrupt transmission and/or reception of the data signal and/or the timing control signal in that node, on the basis of transmission cycle information of the neighboring nodes or the node itself. | 10-02-2008 |
20080247497 | Clock distribution for 10GBase-T analog front end - A 10GBASE-T clocking method that limits EMI and increases SNR, while reducing power and conserving chip space is provided. The method includes simultaneous clocking of transmitters in an analog front end of a 10 gigabit Ethernet. The method includes providing at least two channels to a 10GBase-T analog front end, where the channel has at least a transmitter port and a receiver port, and providing at least two phase interpreters to the analog front end, where each phase interpreter is dedicated to one receiver port. A central clock generator is disposed to distribute a transmit clock to the phase interpreters and to the transmitter ports, where the transmit clock is further provided to the receiver ports from the phase interpreters. Any clock delay between the clock generator and each channel is balanced and clock phases between the channels are matched. | 10-09-2008 |
20080279321 | Method and apparatus for synchronizing data in utility system - A time synchronization device (TSD) that produces a synchronization signal and couples it onto energized power conductors in a power monitoring system. Monitoring devices coupled to the TSD include frequency detection algorithms, such as a Goertzel filter, for detecting the synchronization signal and interpreting the information encoded in the signal. The frequency of the synchronization signal may correspond to the fourth or tenth harmonic component of the fundamental frequency of the voltage on the power conductors. The magnitude of the signal is selected to be above the expected or established noise floor of the power monitoring system plus a predetermined threshold. The duration of the signal can be varied, such as lasting a full cycle of the fundamental frequency. Multiple TSD signals received in a predetermined sequence may be converted into digital words that convey time, configuration, reset, control, or other information to the monitoring device. | 11-13-2008 |
20080298525 | METHOD AND ARRANGEMENT FOR TRANSFERRING SYNCHRONIZING INFORMATION - The invention relates to a method and arrangement for transferring synchronizing information in a data transmission system including modem connections. The arrangement according to the invention comprises a modulator ( | 12-04-2008 |
20080304606 | SYNCHRONIZING A DEVICE THAT HAS BEEN POWER CYCLED TO AN ALREADY OPERATIONAL SYSTEM - A method comprises a system comprising a host device coupled to a first remote device actively operating according to a state diagram that the host device and all remote devices follow during operation of the system. The method further comprises powering up a second remote device while the host device and first remote device are actively operating according to the state diagram. The second remote device waits for a synchronization point sequence. Upon detecting the synchronization point sequence, the second remote device implements a predetermined feature set and synchronizes itself to the state diagram at a common point as the host device and first remote device. | 12-11-2008 |
20080317183 | Method for Determining Clock Trace Path and Method for Clock Trace in the Network - A method for clock tracing in a network and a method for clocking tracing, the method for clock tracing in a network includes: distributed network element or a centralized server in the network determining a shortest path to each of clock-source network elements according to stored network topology information and clock-tracing link weight information; determining, among clock sources provided by reachable clock-source network elements, one with an optimal quality, where a clock-source network element with that clock source being considered optimal; and taking a shortest path to the optimal clock-source network element as a clock-tracing path. Furthermore, the method for clocking tracing uses such a clock-tracing path for clock tracing. | 12-25-2008 |
20090016474 | METHOD FOR SWITCHING A COMPONENT TO AN OPERATION MODE FOR REDUCING POWER CONSUMPTION IN A WIRELESS COMMUNICATION DEVICE - An embodiment of a method for switching to an operating mode a device comprising a counter counting the pulses number of a first clock and a date synchronized with an external reference date. | 01-15-2009 |
20090016475 | STEP TIME CHANGE COMPENSATION IN AN INDUSTRIAL AUTOMATION NETWORK - One or more embodiments provide Common Industrial Protocol (CIP) based time synchronization systems and methods. The CIP Sync solution can be part of Ethernet/IP and can be based on standard UDP (User Datagram Protocol) and/or IEEE 1588 (Time Synchronization) Ethernet technology. According to an embodiment is a system that compensates for step changes in a master clock. | 01-15-2009 |
20090022255 | Communication System, Real-Time Control Device, and Information Processing System - In addition to fast on-off timing, instructive information on an output wave such as an amplitude or a slope is transmitted through a small number of signal lines. Output wave modifier information such as the amplitude or slope is transferred through serial communication | 01-22-2009 |
20090086867 | Method and System for Multi-Point Signal Generation with Phase Synchronized Local Carriers - A method and system of applying modulated carrier signals to tree networks and processing signals tapped from the tree networks to generate output signals with phase-synchronized carriers are disclosed. | 04-02-2009 |
20090097604 | METHODS FOR MULTI-CHANNEL DATA DETECTION PHASE LOCKED LOOP ERROR COMBINATION - Phase-error combination methods for a multi-channel data detection system with a phase locked loop for each channel, comprises receiving phase error information with respect to each channel; combining the received phase error information and generating a combined phase error; and applying the combined phase error to at least one channel phase locked loop. Error signal combination comprises receiving error information of a signal relevant to a phase locked loop with respect to each channel; combining the received error signal information and generating a combined error signal, weighting the received error signal information from each channel, for example with reliability information. The combined, weighted error signal is applied to at least one channel phase locked loop. | 04-16-2009 |
20090168935 | METHODS AND APPARATUS FOR SYNCHRONIZING NETWORKED AUDIO DEVICES - A method includes determining a network counter value indicative of a network clock time of a system at a first time instant and a second time instant occurring later in time than the first time instant. The method further includes determining an audio counter value indicative of an audio clock time of the system at a third time instant occurring the first and second time instants and a fourth time instant occurring later in time than the second time instant. The method further includes determining an offset based upon the determined network counter values and the audio counter values. The method further includes adjusting the audio clock time based upon the determined offset to synchronize operation of at least one audio component operating according to the audio clock with at least one audio component operating according to the network clock. An associated system is also disclosed. | 07-02-2009 |
20090213970 | Intermittent operative communication apparatus adaptively controlling the timing of waiting data reception and a method therefor - An intermittent operative communication apparatus can send data, received from a source communication device, to any receiver communication device at a predetermined interval and wait for receiving data at the predetermined interval. The communication apparatus has a selector for selecting one or multiple receiver communication devices as a reference communication device that gives a reference timing at which the communication apparatus waits for receiving data, and a timing controller for setting a timing, at which the communication apparatus waits for receiving data, to a timing according to operation of any reference communication device. | 08-27-2009 |
20090279651 | NETWORK AND METHOD FOR CLOCK SYNCHRONIZATION OF CLUSTERS IN A TIME TRIGGERED NETWORK - The invention relates to a network operating on a time triggered protocol using time slots, wherein at least two clusters are included in the network, each cluster includes at least a node. Further, it relates to a method for clock synchronization within a time triggered network. To provide a network and a method reducing the amount of time needed for aligning multiple communication clusters as much as possible it is proposed to provide a network operating on a time triggered protocol using time slots, wherein at least two clusters (A, B, X) are included in the network, each cluster (A, B, X) includes at least a node ( | 11-12-2009 |
20090279652 | Synchronizing Clocks Across a Communication Link - Apparatus, system and method for synchronizing one or more clocks across a communication link. A slave clock may be synchronized to a master clock by means of a synchronization signal sent from the master to the slave clock side of the link. The synchronization signal may be an expected signal pattern sent at intervals expected by the slave side. The slave clock may correlate received signals with a representation of the expected synchronization signal to produce a correlation sample sequence at a first sample rate which is related as n times the slave clock rate. The synchronization signal receipt time indicated by the correlation sample sequence may be refined by interpolating the correlation sample sequence around a best correlation sample to locate a best interpolation at an interpolation resolution smaller than the sample resolution. The best interpolation may in turn be further refined by estimating between interpolator outputs adjacent to the best interpolation output. The synchronization signal receipt time thus determined is compared to the expected time based upon the slave clock, which is adjusted until the times match. After initialization, all slave clock errors are preferably accumulated to prevent long-term slip between the slave and master clocks. Formerly independent master and slave clocks synchronized across the communication link constitute a noncommon clock which may be compared on each side of the link to secondary independent clocks, and the secondary independent clocks may then be separately synchronized by adjusting one to have the same difference from its local noncommon clock as the secondary clock on the other side of the link has from its local noncommon clock. | 11-12-2009 |
20090290668 | Communication apparatus and control method - A first communication apparatus receives, from a second communication apparatus, information indicating the number of relays from a first supplying apparatus to the second communication apparatus. The first communication apparatus receives, from a third communication apparatus, information indicating the number of relays from a second supplying apparatus to the third communication apparatus. The first communication apparatus transmits, to the third communication apparatus, information indicating the number of relays from the first supplying apparatus to the first communication apparatus. The first communication apparatus transmits, to the second communication apparatus, information indicating the number of relays from the second supplying apparatus to the first communication apparatus. The first communication apparatus selects the second communication apparatus, which has a smaller number of relays among the second and the third communication apparatuses. The first communication apparatus synchronizes a clock thereof with a clock of the second communication apparatus. | 11-26-2009 |
20100002820 | MULTISTATION COMMUNICATION APPARATUS - A multistation communication apparatus in which each of a plurality of primary stations ( | 01-07-2010 |
20100040183 | METHOD, CIRCUIT, AND DESIGN STRUCTURE FOR CAPTURING DATA ACROSS A PSEUDO-SYNCHRONOUS INTERFACE - A structure for performing cross-chip communication with mesochronous clocks. The structure includes: a data delay line; a remote clock delay line; a structure that captures at least one value of a state of a delayed remote clock signal on the remote clock delay line; and a control that influences a delay associated with the data delay line and the remote clock delay line. | 02-18-2010 |
20100080332 | CLOCK-SYNCHRONOUS COMMUNICATION APPARATUS AND COMMUNICATION SYSTEM - In a clock-synchronous communication system, a clock pulse as a communication clock is outputted from a master device to a slave device so as to synchronize the master device and slave device. The transmitting side transmits a data to a data line with a first edge timing of the clock pulse, and the receiving side receives the data from the data line with a second edge timing of the clock pulse. A microcomputer as the master device is configured to enable separate setting of high-level duration and low-level duration of a clock pulse to be outputted, using a program. High-level duration and low-level duration are each set to a minimum value that satisfies the requirements for constituting communication with a communication destination. Uprating not only the cycle of a clock pulse but also the communication baud rate, efficient clock-synchronous communication can be performed. | 04-01-2010 |
20100086091 | METHOD AND APPARATUS FOR SYNCHRONIZING TIME OF DAY OF TERMINAL IN CONVERGENT NETWORK - Provided is a method and apparatus for synchronizing a time of day (TOD) in a convergent network, wherein the TOD is received from a time server connected in the convergent network and is provided to a terminal connected in a wired or wireless network, specifically a terminal connected in a heterogeneous network, that requires TOD information. The apparatus includes a time server that provides standard TOD information, a gateway or a host personal computer (PC) that provides the standard TOD information of the time server to the terminal in a 3rd layer or lower instead of an upper layer of the open system interconnection (OSI) 7 layer model, and the terminal that adjusts a local clock according to the provided standard TOD information. According to the method and apparatus, the terminal not only maintains a very precise TOD by obtaining TOD information of the time server periodically or when required, but also obtains the TOD information without using application software for processing the TOD information. Accordingly, power consumption of the terminal is decreased. | 04-08-2010 |
20100098202 | NETWORK CONNECTION APPARATUS AND COMMUNICATION SYSTEM AND METHOD APPLYING THE SAME - In a communication network, a network connection apparatus accepts timing information of a grand master to achieve timing synchronization. Next, the network connection apparatus requests slave nodes to be in timing synchronization with itself to achieve the timing synchronization. Even when the grand master is removed or crashed, when a new slave node is added, or when a hack node tries to hack the communication network, the network connection apparatus still periodically requests the slave nodes to be in timing synchronization with itself so that the timing synchronization inside the communication network is not negatively affected. | 04-22-2010 |
20100150288 | Synchronization of Low Noise Local Oscillator using Network Connection - Two or more local-oscillator-equipped instruments connected to a network are disclosed. Among the instruments, one instrument is designated as the master instrument and the rest, slave instruments. A master clock signal generated by the local oscillator of the master instrument is used by the slave instruments, through the network, to discipline their own local oscillators to generate slave clock signals that are synchronized to the master clock signal. | 06-17-2010 |
20100172454 | SYNCHRONIZATION PROTOCOL - An efficient synchronization procedure applicable to mesh WLAN based on the 802.11s standard is proposed. A first and second stations initiate the process and establish a communication link between them. Next, the first station transmits to the second station a synchronization element that contains: a capability information element indicative of a capability of the first station to synchronize, and a status information element indicative of whether the first station has established a synchronized peer link with another station. One of the two stations may then initiate the actual handshake for synchronization. The initiator transmits a request for synchronization and receives a response from the other station representative of the acceptance by the other station of the synchronization, the request and the acceptance being restrained in that the stations may not entertain conflicting synchronization procedures with different links. The request may include a set of the synchronization profile. | 07-08-2010 |
20100183108 | High Speed Serializer - According to one embodiment, a high speed serializer for multiplexing | 07-22-2010 |
20100254499 | NETWORK SYNCHRONIZATION OVER IP NETWORKS - Network timing is derived from the PSTN and distributed through the network to gateways capable of deriving timing from the incoming UDP stream. The derived timing has the correct frequency for voice telephony without using external timing sources or extraneous hardware components. For example, a digital signal processor (DSP) can derive the timing from a timed TDM bus and distribute messages, such as IP messages, to other gateways or port networks. The other gateways and port networks use the incoming stream to extract the timing which is then used to time their TDM bus. The port networks and gateways can also distribute other streams to other gateways in a fan-out type of arrangement. This internally generated timing can be used, for example, for Circuit Emulated Services (CES). | 10-07-2010 |
20100290572 | NETWORK SYNCHRONIZATION METHOD AND APPARATUS FOR PERFORMING TIME SYNCHRONIZATION BETWEEN NODES - Provided is a network synchronization method and apparatus for performing a time synchronization between nodes. When a system starts up and the time synchronization between the nodes is initiated, the network synchronization method and apparatus may enhance jitter, wander, and a time synchronization performance by gradually increasing a window size for a propagation time measurement. When a full window of propagation time measurements is collected, the network synchronization method and apparatus may enhance jitter, wander, and the time synchronization performance by applying an exponential to a computation of an average propagation time value. | 11-18-2010 |
20100329403 | DYNAMIC QUADRATURE CLOCK CORRECTION FOR A PHASE ROTATOR SYSTEM - A system and method for closed loop clock correction includes adjusting two or more input signals comprising at least one in-phase clock and one quadrature clock, and applying adjusted quadrature clock signals to a device capable of generating a 4-quadrant interpolated output clock phase. An interpolated output clock phase is delayed to form a clock for a measurement device. Two or more adjusted input signals are measured on a measurement device over a range of interpolated output clock phases. Errors are determined on the in-phase clock and the quadrature clock using sampled information from the measurement device. The in-phase clock and the quadrature clock are adapted using determined error information. | 12-30-2010 |
20100329404 | SYSTEM FOR SYNCHRONIZING CLOCK - A system for synchronizing clock, which is used to realize the synchronization between a radio frequency module and a base band module in a base station, comprises: one or more time generators, located on the radio frequency module side, configured to generate a synchronous signal according to an external clock signal, and to send the synchronous signal to a time distributor; the time distributor, located on the base band module side, configured to generate a synchronous clock according to a synchronous signal from one of the one or more time generators, and to adjust the synchronous clock according to a communication delay between the time generator which outputs the synchronous signal and the time distributor, and to send the synchronous clock adjusted to the radio frequency module and the base band module to realize the synchronization between the radio frequency module and the base band module. | 12-30-2010 |
20110002429 | NETWORK DEVICES, METHODS AND/OR SYSTEMS FOR USE IN A MEDIA NETWORK - In certain aspects, the present disclosure is related to devices, methods, systems and/or computer-readable media for use in an isochronous media network in which media devices connected to a network employ one or more synchronization signal to regulate or facilitate the transmission of media signals through the network. In certain aspects, the present disclosure is also related to devices, methods, systems and/or computer-readable media for use in a larger unified, or substantially unified, isochronous network created from aggregating local isochronous media networks in which media devices connected to a network employ a one or more synchronisation signal distributed from a local master clock to regulate or facilitate the transmission of media signals. | 01-06-2011 |
20110007856 | METHOD AND SYSTEM FOR REDUCED SYSTEM-TIME OVERHEAD PARAMETER LENGTH REPRESENTATION FOR INTER-RADIO ACCESS TECHNOLOGY COMMUNICATION - A wireless access terminal, system and method for the wireless access terminal to synchronize to system times in a wireless communication system. A first timing hierarchy in a first wireless communication network is used to operate the wireless access terminal. The first wireless communication network has a first radio access technology. Operating with the first timing hierarchy includes determining a frame cycle for the first wireless communication network. The frame cycle has a frame cycle boundary. Broadcast parameters for a second wireless communication network having a second radio access technology different from the first radio access technology are received. The broadcast parameters include the system time of the second wireless communication network. The system time of second wireless communication network is aligned, from the perspective of the wireless access terminal, with the frame cycle boundary. The wireless access terminal engages in a communication session using the second wireless communication network. | 01-13-2011 |
20110013737 | TIME SYNCHRONIZATION APPARATUS BASED ON PARALLEL PROCESSING - A parallel processing-based time synchronization apparatus is disclosed. The time synchronization apparatus employs a double-filter structure based on parallel processing, thereby providing more precise and reliable time synchronization between a master device and a slave device. | 01-20-2011 |
20110026654 | NETWORK DEVICE OF HIGH-PRECISION SYNCHRONIZATION TYPE, NETWORK SYSTEM, AND FRAME TRANSFER METHOD - A network device that arranges and transfers in an initial period of a cycle a synchronization frame that synchronizes network devices within a network includes: a cycle timer that measures a time within the cycle and a synchronization management unit that suspends frame transmission for a predetermined period till a start of the next cycle in each cycle, on the basis of information from a cycle timer. | 02-03-2011 |
20110051871 | METHOD OF SYNCHRONISING A PLURALITY OF FORMATTING MODULES - In the field of the broadcasting of digital services intended for terminals retrieving these services, the concern is with the problem of synchronisation in the context of a network transmitting on a single modulation frequency and the reliability of the broadcasting channel by redundancy of equipment. | 03-03-2011 |
20110064177 | Device and Method for Time Synchronization in a Communication Network - A device and method for time synchronization in a communication network, wherein a virtual clock is produced by a controller in each network node based on the PROFINET-Standard and/or the Precision Transparent Clock Protocol. In contrast to known methods for estimating the time, the time of the virtual clock does not undergo sudden changes. The virtual clock includes a controlled, continuous path. As a result, the virtual clock is particularly suitable for time-critical applications. Here, the estimation of the time of a reference clock is improved by 18-35%. Accordingly, a markedly greater number of network nodes may be synchronized with a predetermined level of accuracy for the time synchronization. | 03-17-2011 |
20110122980 | METHOD AND SYSTEM FOR SYNCHRONISING STATIONS WITHIN COMMUNICATIONS NETWORKS AND STATIONS FOR USE THEREIN - A system for synchronising stations in a communications network comprising: at least one airborne or space-based vehicle; and at least two stations, each station having receiver means in data communication with the at least one airborne or space-based vehicle and control means in data communication with the receiver means and in control communication with a communication means. When each receiver means receives a synchronisation signal from the at least one airborne or space-based vehicle each receiver means forwards the synchronisation signal to its respective control means. The respective control means processes the synchronisation signal to determine the operational frequency required by its respective communication means to maintain or establish communication with the other station. The respective control means also operates to control its respective communication means to change to the determined operational frequency. | 05-26-2011 |
20110122981 | SYNCHRONIZING CLOCKS ACROSS A COMMUNICATION LINK - Apparatus, system and method for synchronizing one or more clocks across a communication link. A slave clock may be synchronized to a master clock by means of a synchronization signal sent from the master to the slave clock side of the link. The synchronization signal may be an expected signal pattern sent at intervals expected by the slave side. The slave clock may correlate received signals with a representation of the expected synchronization signal to produce a correlation sample sequence at a first sample rate which is related as n times the slave clock rate. The synchronization signal receipt time indicated by the correlation sample sequence may be refined by interpolating the correlation sample sequence around a best correlation sample to locate a best interpolation at an interpolation resolution smaller than the sample resolution. The best interpolation may in turn be further refined by estimating between interpolator outputs adjacent to the best interpolation output. The synchronization signal receipt time thus determined is compared to the expected time based upon the slave clock, which is adjusted until the times match. After initialization, all slave clock errors are preferably accumulated to prevent long-term slip between the slave and master clocks. Formerly independent master and slave clocks synchronized across the communication link constitute a noncommon clock which may be compared on each side of the link to secondary independent clocks, and the secondary independent clocks may then be separately synchronized by adjusting one to have the same difference from its local noncommon clock as the secondary clock on the other side of the link has from its local noncommon clock. | 05-26-2011 |
20110135047 | TIME SYNCHRONIZATION IN INDUSTRIAL PROCESS CONTROL OR AUTOMATION SYSTEMS - Improved time synchronization is provided among the devices of an industrial process control system, e.g., a Substation Automation system, during a temporary absence of a system reference time. Hence, disruption of time-critical protection and control functions due to re-synchronization following the temporary absence of the system reference time is avoided, and the availability of time-critical functions configured on the devices is increased. During normal operation, a device of the system records an offset or discrepancy between the system reference time and an internal local clock of the device for a period of several hours. As soon as the system reference time breaks down, the device starts predicting the offset or drift between its local clock and the unavailable system reference time based on the recorded offset history. As a transient clock master, the device then distributes an approximated or transient system reference time, based on the device's local clock corrected for the predicted offset, to other devices of the system which, in turn, run time-critical protection and control functions. | 06-09-2011 |
20110150159 | CLOCK-FORWARDING TECHNIQUE FOR HIGH-SPEED LINKS - A repeater circuit, such as a clock regeneration and multiplication circuit, is described. In this repeater circuit, a clock multiplier unit (CMU) generates an internal clock signal based on a forwarded clock signal, which is received on a link. Furthermore, a phase interpolator (PI) in the repeater circuit provides the output clock signal based on the forwarded clock signal and the internal clock signal. Note that the CMU and the PI filter reduce the cycle-to-cycle jitter in the forwarded clock signal and the internal clock signal, and that the output clock signal has a phase that is a weighted average of the phases of the forwarded clock signal and the internal clock signal. In addition, the relative weights of the forwarded clock signal and the internal clock signal (i.e., the amount of phase averaging and jitter filtering) may be adjusted based on a position or location on the link. | 06-23-2011 |
20110286560 | NETWORK SYSTEM WITH SYNCHRONIZATION AND METHOD OF OPERATION THEREOF - A method of operation of a network system including a network line terminal coupled to a slave network unit and a master network unit over a first network includes: calculating a master round trip time between the network line terminal and the master network unit; sending a master message to the slave network unit, the master message having the master round trip time and a master local time; and calculating a slave local time based on the master round trip time and the master local time. | 11-24-2011 |
20110299641 | Synchronous Network Device - A physical layer device including a plurality of ports and a clock synchronization module. Each port of the plurality of ports is programmable to receive a grandmaster clock. The clock synchronization module is configured to i) receive the grandmaster clock from a first port of the plurality of ports (wherein the first port has been programmed to receive the grandmaster clock), and ii) clean up the grandmaster clock, wherein cleaning up the grandmaster clock includes one or more of removing jitter from the grandmaster clock, controlling a voltage swing or the grandmaster clock, or establishing fixed edge rates of the grandmaster clock. Other ones of the plurality of ports, not including the first port, are programmed to receive the cleaned up grandmaster clock for use when transmitting data. | 12-08-2011 |
20120027145 | DISTRIBUTED DIGITAL REFERENCE CLOCK - A communication system includes master host unit, hybrid expansion unit, and remote antenna unit. Master host unit communicates analog signals with service provider interfaces. Master host unit and hybrid expansion unit communicate N-bit words of digitized spectrum over communication link. Hybrid expansion unit converts between N-bit words and analog spectrum. Hybrid expansion unit and remote antenna unit communicate analog spectrum over analog communication medium. Remote antenna unit transmits and receives wireless signals over air interfaces. Master host unit includes master clock distribution unit that generates digital master reference clock signal. Master host unit communicates digital master reference clock signal over communication link. Hybrid expansion unit receives digital master reference clock signal from master host unit over communication link and generates analog reference clock signal based on digital master reference clock signal. Hybrid expansion unit sends, and remote antenna unit receives, analog reference clock signal across analog communication medium. | 02-02-2012 |
20120027146 | CLOCK RECOVERY IN A COMMUNICATIONS NETWORK - The invention relates in general to clock recovery in a communications network, and in particular to clock recovery in a packet based communications network. Methods and apparatus are disclosed for determining a client timing signal | 02-02-2012 |
20120087453 | METHOD FOR SELECTING CLOCK SOURCE IN SYNCHRONIZATION DIGITAL HIERARCHY NETWORK - A method for selecting a clock source in Synchronization Digital Hierarchy (SDH) network and a clock module are provided in the present invention. The method includes: generating a clock information message based on the clock quality information in SDH network, and the clock module of every network node in said SDH network independently selects a clock source by using said clock information message. The method and clock module for selecting a clock source in SDH provided in the present invention enable automatic switch and recovery for a clock source, and effectively solve the problem of clock looping, and adequately maintain the compatibility with the existing system without increasing the cost of the system. | 04-12-2012 |
20120134456 | METHODS AND APPARATUSES FOR SYNCHRONIZATION OF WIRELESS DEVICES IN WIRELESS NETWORKS - To maintain a synchronized wireless peer group, timing signals may be periodically transmitted by one or more devices in the wireless peer group. These periodic timing signals may be transmitted by different wireless devices in the peer group, distributing (sharing) the transmit power burden among the different wireless devices, increasing the useful operation time of the individual wireless devices. Similarly, the wireless peer group may monitor for timing signals received from devices that are not part of the wireless peer group. This monitoring burden may also be distributed (shared) among the devices in the peer group allowing for a greater sleep time for individual wireless devices, increasing the useful operation time of the individual wireless devices. | 05-31-2012 |
20120134457 | NODE SYSTEM AND SUPERVISORY NODE - A node system includes a first node, a second node, and a supervisory node which transmit frames while increasing or decreasing the cycle microtick count, and determines reduced cycle microtick counts by subtracting or adding a rate correction limit value from or to the cycle microtick count of the supervisory node when reception of the first frame transmitted by the first node stop and the cycle microtick count of the supervisory node when reception of the first and second frames stop. | 05-31-2012 |
20120140861 | Data Sensor Coordination Using Time Synchronization in a Multi-Bus Controller Area Network System - A method is provided for synchronizing time in an unsynchronized vehicle controller area network system. A master control unit receives a global time from a time synchronization source. The master control unit estimates a respective time delay in transmitting messages by electronic control units on each controller area network bus. The time delay is a difference between a time when a message is generated by a respective electronic control unit for transmission on a respective controller area network bus and a time when the message is transmitted on the respective controller area network bus. The global time is adjusted for each respective controller area network bus based on the estimated time delays associated with each respective controller area network bus. Global time messages from the master control unit are transmitted to each electronic control unit that include the adjusted global times for an associated controller area network bus. | 06-07-2012 |
20120163520 | SYNCHRONIZING SENSOR DATA ACROSS DEVICES - Techniques are provided for synchronization of sensor signals between devices. One or more of the devices may collect sensor data. The device may create a sensor signal from the sensor data, which it may make available to other devices upon a publisher/subscriber model. The other devices may subscribe to sensor signals they choose. A device could be a provider or a consumer of the sensor signals. A device may have a layer of code between an operating system and software applications that processes the data for the applications. The processing may include such actions as synchronizing the data in a sensor signal to a local time clock, predicting future values for data in a sensor signal, and providing data samples for a sensor signal at a frequency that an application requests, among other actions. | 06-28-2012 |
20120163521 | SECURE CLOCK SYNCHRONIZATION - The present disclosure provides a secure one-step IEEE 1588 clock using either a symmetric or asymmetric protection scheme. Clocks of mission-critical or highly-available devices in industrial automation systems connected to a communication network are synchronized by sending, by a master clock, a synchronization message, e.g., a single message of the one-step-clock type according to IEEE 1588, including a time stamp, and by receiving and evaluating, by a slave clock, the synchronization message. A synchronization component or module of the master clock prepares, or composes, prior to a projected send time, a synchronization message including a time stamp of the projected send time, and secures the synchronization message in advance of the projected send time. Securing the synchronization message occurs by suitable cryptographic means allowing for authentication of the time stamp at a receiving slave clock. At the projected send time, the secured synchronization message is transmitted. | 06-28-2012 |
20120275553 | SYSTEMS, DEVICES AND METHODS OF SYNCHRONIZING INFORMATION ACROSS MULTIPLE HETEROGENEOUS NETWORKS - The various embodiments include methods, computers and communication systems that enable synchronizing information in a telecommunications system, which may include receiving a first message including communication information to be synchronized from a first domain, receiving a second message including information associated with a communication on a component in a second telecommunication domain, synchronizing information included in the first message with information included in the second message, and sending the synchronized information to a public interface of the first domain. Synchronizing the information included in the first message with information included in the second message may include synchronizing one or more of metering, rating, charging, balance, policy, and contextual information. | 11-01-2012 |
20120294400 | METHOD AND SYSTEM FOR MULTI-POINT SIGNAL GENERATION WITH PHASE SYNCHRONIZED LOCAL CARRIERS - A method and system of applying modulated carrier signals to tree networks and processing signals tapped from the tree networks to generate output signals with phase-synchronized carriers are disclosed. | 11-22-2012 |
20130044843 | METHOD AND APPARATUS FOR PERFORMING TIMING SYNCHRONIZATION - A method, apparatus and computer program product are provided in order to cause a timing alignment timer or a plurality of timing alignment timers to be reset based on a timing alignment timer message. In this regard, a method is provided that provides receiving a message. The method further includes determining whether the message includes a restart indication. The method additionally includes causing a plurality of timing alignment timers to be restarted in an instance in which the message includes a restart indication. | 02-21-2013 |
20130089170 | Egress Clock Domain Synchronization to Multiple Ingress Clocks - Synchronization techniques for multiple clock domains from two or more clients or common pluggable interfaces connected to multiple interfaces on one or more ingress line cards to multiple interfaces on one or more egress line cards are provided. The plurality of clock domain information from the clients that are connected on the ingress side is transmitted to the egress line cards. Two or more egress interfaces generate different clocks that are synchronized to the multiple clock domains. | 04-11-2013 |
20130136218 | INFORMATION PROCESSING APPARATUS, METHOD, AND PROGRAM - The present invention relates to an information processing apparatus, a method, and a program capable of suppressing deterioration of content quality. An integrated reception buffer time adjustment unit 114 obtains a maximum transmission delay time that is the longest delay time among the transmission delays of data transmission performed by each reception unit 113. The reception buffer time setting unit 208 calculates a reception buffer time using the maximum transmission delay time, a transmission delay time of the data transmission by the reception unit 113, and a prescribed reception buffer time. The reception buffer time setting unit 208 sets various delay times and waiting times such as a variable compression encoding delay time, a redundant encoding block reception waiting time, an ARQ retransmission packet waiting time, and a network jitter handling buffer time from the reception buffer time. The present invention can be applied to an information processing apparatus, for example. | 05-30-2013 |
20130182806 | Method for Time Synchronization in a Communications Network - A method for time synchronization in a communications network having multiple nodes, wherein the nodes comprise a first node and at least one second node, where the first node generates first cycle counter states according to a reference clock frequency and the second node or nodes each generate second cycle counter states according to an internal clock frequency, where a time synchronization is carried out in sequential synchronization cycles, in which synchronization messages originating from the first node are sequentially transmitted from one node to another node, and a synchronization message transmitted by a node contains information used for time synchronization in the at least one second node receiving the synchronization message such that a time synchronization is performed in a given second node based on an estimation of a first cycle counter state and a compensation factor in combination with a linear quadratic regulator. | 07-18-2013 |
20130272463 | DISTRIBUTED DIGITAL REFERENCE CLOCK - A communication system includes master host unit, hybrid expansion unit, and remote antenna unit. Master host unit communicates analog signals with service provider interfaces. Master host unit and hybrid expansion unit communicate N-bit words of digitized spectrum over communication link. Hybrid expansion unit converts between N-bit words and analog spectrum. Hybrid expansion unit and remote antenna unit communicate analog spectrum over analog communication medium. Remote antenna unit transmits and receives wireless signals over air interfaces. Master host unit includes master clock distribution unit that generates digital master reference clock signal. Master host unit communicates digital master reference clock signal over communication link. Hybrid expansion unit receives digital master reference clock signal from master host unit over communication link and generates analog reference clock signal based on digital master reference clock signal. Hybrid expansion unit sends, and remote antenna unit receives, analog reference clock signal across analog communication medium. | 10-17-2013 |
20130336435 | Communication System and Method for Synchronizing a Plurality of Network Nodes After a Network Lock Condition Occurs - A communication system and method is provided herein for synchronizing a plurality of network nodes after a network lock condition occurs within a network. According to one embodiment, the method may generate a local trigger signal simultaneously at each of the plurality of network nodes by compensating for unique phase delays attributed to each of the plurality of network nodes. As described herein, the local trigger signals may be used for synchronizing devices, such as multimedia devices, which may be coupled to the network nodes. More specifically, the local trigger signals may be used to synchronize events occurring within devices, which are coupled to different nodes of the network. | 12-19-2013 |
20140037034 | METHOD AND SYSTEM FOR MULTI-POINT SIGNAL GENERATION WITH PHASE SYNCHRONIZED LOCAL CARRIERS - A method and system of applying modulated carrier signals to tree networks and processing signals tapped from the tree networks to generate output signals with phase-synchronized carriers are disclosed. | 02-06-2014 |
20140086375 | SYNCHRONIZATION DISTRIBUTION IN MICROWAVE BACKHAUL NETWORKS - In some embodiments, a system comprises a clock, a root node, a radio channel network, and first and second child nodes. The clock may be configured to generate a clock signal. The root node may be configured to generate a first frame including a first payload and a first overhead and generate a second frame including a second payload and a second overhead. The first and second overheads may comprise a synchronization value based on the clock signal. The radio channel network may be in communication with the root node for transmitting the first and second frames. Each first and second child nodes may be configured to perform clock recovery including frequency synchronization using the synchronization value and a respective phase-lock loop. | 03-27-2014 |
20140177769 | AUTOMATED SYSTEM AND METHOD FOR SYNCHRONIZING AN AUTOMATED SYSTEM - An automated system and method that includes at least two cooperating electrical components, each having a time counter. The electrical components being coupled to one another via signals for cyclically transmitting process data via a signal network, and are synchronized with one another based on global, relative time information as a reference quantity. | 06-26-2014 |
20140334582 | MEASURING TIME OFFSETS BETWEEN DEVICES WITH INDEPENDENT SILICON CLOCKS - Methods and apparatus relating to measuring time offsets between devices with independent silicon clocks are described. In some embodiments, logic is provided to synchronize a first clock of a first agent with a second clock of a second agent based on one or more messages exchanged between the first agent and the second agent and a platform time. The first agent and the second agent are coupled via a link. Other embodiments are also disclosed and claimed. | 11-13-2014 |
20140376676 | Methods, devices, and algorithms for the linearization of nonlinear time variant systems and the synchronization of a plurality of such systems - Methods, devices and algorithms for the linearization of nonlinear time variant systems and the synchronization of a plurality of such systems. An example of such a system would be a transmit path, including the power amplifier, as used in wireless transmit systems. Advances made in CMOS technology, digital to analog converter (DAC) technology make it possible to implement a substantial part of such a system in the digital domain. Another aspect is the integration of a substantial part of such a transmit system in a single integrated circuit (IC). A digital implementation that allows for linearization of a broad range of nonlinear and time variant effects. Since this digital implementations operate a high clock frequency a energy efficient implementation is essential to keep the power consumption under control. Another aspects is the reuse of methods, devices and algorithms used for the linearization a transmit system to synchronize multiple transmit systems. | 12-25-2014 |
20150098539 | Method for synchronizing the recording of data in pipeline networks - A method and device for synchronizing the recording of data in pipeline networks, in which at least two sensor units arranged spaced apart are disposed for detecting a leak, each sensor unit including at least one sensor for registering an analog signal, at least one GPS receiver and at least one communication module which communicates by radio with at least one data logger, characterized in that the synchronization for the purpose of recording data is started via a GPS trigger pulse from at least one GPS satellite. | 04-09-2015 |
20150098540 | CLOCK DISTRIBUTION MODULE, SYNCHRONOUS DIGITAL SYSTEM AND METHOD THEREFOR - A clock distribution module for a digital synchronous system is described. The clock distribution module comprising a first node arranged to comprise a clock signal comprising a propagation delay relative to a reference clock signal, at least one further node arranged to comprise a clock signal comprising a propagation delay relative to the reference clock signal corresponding to that of the first node, and a clock configuration module. The clock configuration module is arranged to receive at least one indication of clock skew between the first node and at least one further node of the clock distribution module, and to selectively couple the first node to the at least one further node based at least partly on the at least one indication of clock skew there between. | 04-09-2015 |
20150139375 | COMMUNICATION SYSTEM, RECEIVER, AND EYE-OPENING MEASURING METHOD - A communication system includes: a plurality of lanes; a plurality of transmission circuits respectively outputting data to the lanes in accordance with a transmission clock; and a plurality of reception circuits respectively receiving data from the lanes, each reception circuit includes: a clock data recovery circuit extracting own clock information from received data: a clock information switch circuit selecting either one of the own clock information of the reception circuit or another own clock information of an another reception circuit; a phase shifter generating a phase adjusted clock from a common reception clock source in accordance with clock information selected by the clock information switch circuit; and an input circuit taking in transmitted data in accordance with the adjusted clock, and the clock information switch circuit selects the own clock information in a normal operation and selects the another own clock information in an eye-opening measurement operation. | 05-21-2015 |
20150349947 | SIGNAL PROCESSING DEVICE, SIGNAL PROCESSING METHOD, AND PROGRAM - Provided is a signal processing device including: a valid clock width calculation unit configured to calculate a valid clock width corresponding to a bit rate of a valid section in which a transport stream (TS) packet exists; and a TS clock signal generation unit configured to generate, on a basis of the valid clock width calculated by the valid clock width calculation unit, a TS clock signal by combining clocks with different frequency dividing rates. | 12-03-2015 |
20160028535 | SYSTEM AND METHOD FOR SYNCHRONIZING GROUND CLOCKS - A system and method of synchronizing clocks within a system having a plurality of base stations, wherein each base station includes a frequency locked clock. A fast moving emitter transmits pulses that are received at each base station. A time of arrival for each pulse received by each base station is recorded and the recorded times of arrival are communicated to at least one of the other base stations. The clocks are synchronized as a function of the recorded times of arrival received from each base station. | 01-28-2016 |
20160056859 | METHOD OF STARTUP SEQUENCE FOR A PANEL INTERFACE - A system for starting a point-to-multi-point serial communications system. The system includes a transmitter having a sync connection and a plurality of data outputs and a plurality of receivers, each of the plurality of receiver having a sync connection and a data input; the data input of each of the plurality of receivers being connected to a respective one of the plurality of data outputs of the transmitter; and the sync connection of the transmitter being connected, by a conductor, to the sync connection of each of the plurality of receivers, each of the plurality of receivers comprising a first impedance and a first switch, the first impedance and the first switch configured to establish, when the first switch is closed, a current path between the sync connection of the receiver and a first voltage source in the receiver. | 02-25-2016 |
20160087782 | MULTI-DROP CHANNELS INCLUDING REFLECTION ENHANCEMENT - A clock channel to couple a transmitter to a plurality of receivers, the clock channel including: a transmission line to be coupled to an input of at least one receiver from among a plurality of receivers, the transmission line including: a reflection portion to reflect a clock signal propagating through the clock channel according to a clock frequency. | 03-24-2016 |
20160094335 | DISTRIBUTION OF DYNAMIC ACCURACY INFORMATION IN A NETWORK OF IEEE 1588 CLOCKS - An intermediate clock, either a boundary clock or a transparent clock, may have to adjust its local clock to match that of a grandmaster clock. If such adjustment is frequent or large, then the intermediate clock may not have much confidence in the reliability of the timing information it passes to a downstream clock in an IEEE 1588 Announce message even if the quality of its local clock is high. The intermediate clock determines a measure of the reliability of its timing information. The intermediate clock inserts an indication of the reliability of the timing information in a transmitted IEEE 1588 Announce message. The intermediate clock may consider an indication of reliability found in an Announce message it receives when inserting an indication of the reliability of timing information into an Announce message which it transmits. | 03-31-2016 |
20160094337 | SYSTEM-ON-CHIP TO SUPPORT FULL HANDSHAKE AND MOBILE DEVICE HAVING THE SAME - A system-on-chip (SoC) comprises a clock management unit (CMU) including a first clock generator and a second clock generator, the first and second clock generators being configured to generate clock signals. The SoC comprises at least one logic block configured to request the clock signals from the CMU according to a full handshake method and receive the clock signals from the CMU in response to the request. The first clock generator and the second clock generator are configured to communicate according to the full handshake method. | 03-31-2016 |
20160128013 | DIRECT COMMUNICATION NETWORK SYSTEM AND SIGNAL SYNCHRONIZATION METHOD THEREOF - A direct communication network system and a signal synchronization method thereof are provided. The direct communication network system includes a first direct communication apparatus and a second direct communication apparatus. The first direct communication apparatus synchronizes with a base station within communication coverage of the base station. The second direct communication apparatus synchronizes with the first direct communication apparatus outside the communication coverage of the base station according to at least one first synchronization signal of the first direct communication apparatus. The first direct communication apparatus determines an abnormal synchronization status with the base station, and adjusts a transmitting status of the at least one first synchronization signal. The second direct communication apparatus switches synchronization to a third direct communication apparatus according to the transmitting status of the at least one first synchronization signal and synchronizes with the third direct communication apparatus via at least one second synchronization signal. | 05-05-2016 |
20160164662 | COMMUNICATION SYSTEM HAVING SYNCHRONIZED UNITS AND SYNCHRONIZATION METHOD FOR UNITS - Disclosed are a communication system and a synchronization method for enabling synchronization of units included in the communication system in case of a communication line failure. In the communication system according to the present invention, all units are synchronized with the period of an ADSYNC outputted from a master unit when the ADSYNC, in which a data transmission preparation period and a data transmission period make a single cycle, is outputted from the master unit; slave units output a free-run ADSYNC when an ADSYNC is not outputted from the master unit; and, when a plurality of the slave units output free-run ADSYNCs, the slave units are synchronized with any one free-run ADSYNC from among the outputted free-run ADSYNCs. | 06-09-2016 |