ICOM INCORPORATED Patent applications |
Patent application number | Title | Published |
20150264516 | NEAR-FIELD WIRELESS COMMUNICATION SYSTEM, COMMUNICATION TERMINAL, AND COMMUNICATION METHOD - The communication terminals each includes a communication controller for identifying the communication terminal to be reconnected as a communication destination after an inter-terminal connection is disrupted. The communication controller includes a first table and a second table. The first table is configured to, while placing a highest priority on the communication terminal most recently connected before the inter-terminal connection is disrupted, place a first connection priority on the other communication terminals according as a connection order in a direction of going back in time. The second table is configured to place a second connection priority on the other communication terminals by each device function thereof. The communication controller identifies, as the communication terminal to be reconnected as the communication destination, a communication terminal with the first connection priority ranked highest among the other communication terminals with the second connection priority ranked highest. | 09-17-2015 |
20150263793 | WIRELESS DEVICE AND NEAR-FIELD WIRELESS COMMUNICATION METHOD - The data to be supposed to be processed by a microcontroller unit (MCU) of the near-field wireless communication module in a wireless device is processed by a digital signal processor (DSP) of the module instead of the MCU in order to expedite processing of commands. | 09-17-2015 |
20150263788 | WIRELESS APPARATUS, WIRELESS DEVICE, AND COMMUNICATION METHOD - A wireless apparatus has a wireless device and a communication terminal. When an instruction associated with a first function of the wireless device is inputted, the communication terminal transmits the inputted instruction to the wireless device through near-field wireless communication. The wireless device performs data communication with the communication terminal. The wireless device, when the instruction is received through the near-field wireless communication, interprets the instruction as an instruction associated with a second function of the wireless device that differs from the first function, and accordingly controls the second function. | 09-17-2015 |
20150016568 | PREAMBLE GENERATING DEVICE, PREAMBLE GENERATING METHOD, AND NON-TRANSITORY COMPUTER-READABLE RECORDING MEDIUM STORING A PROGRAM - A first calculator generates first computational data by multiplying each element in a result obtained by applying a fast Fourier transform to data containing at least one of a real data sequence and an imaginary data sequence with reordered elements by an element of a preamble model at a same position as the each element. A second calculator generates second computational data by performing computation that converts an absolute value of each element in the inverse fast Fourier-transformed first computational data into a value in a predetermined range. A third calculator generates third computational data by multiplying each element in the fast Fourier-transformed second computational data by an element of the preamble model at a same position as the each element. A decider generates the third computational data as a preamble in a case of the PAPR of the inverse fast Fourier-transformed third computational data matching a predetermined criterion. | 01-15-2015 |
20140370888 | RADIO COMMUNICATION SYSTEM, LOCATION REGISTRATION METHOD, REPEATER, AND RADIO CLIENT DEVICE - A radio client device scans a channel allocated to a predetermined repeater, and transmits a request for location registration to the predetermined repeater in a case of detecting a usage condition signal. A repeater, in a case of receiving a request for location registration from a radio client device, conducts location registration for the radio client device, transmits information about the radio client device whose location is registered to a predetermined repeater in a communication area of the repeater or to a predetermined repeater in a different communication area, and in a case of receiving information about a radio client device whose location is registered from another repeater in the communication area of the repeater, transmits information about the radio client device whose location is registered to the predetermined repeater in the different communication area. | 12-18-2014 |
20140359355 | COMMUNICATION DEVICE AND COMMUNICATION METHOD - A modulator subjects an input signal to primary modulation to generate a primary modulated signal. A transmitter generates and transmits a transmission signal based on a secondary modulated signal generated from the primary modulated signal. A retransmission request receiver receives a retransmission request that contains identification information. An operator uses a data sequence that is a set of elements of a same number as a number of elements in an input signal identified by the identification information and with element values of 1 or 0 to generate operation data whose elements are values of exclusive OR of respective elements of the input signal and respective elements of the data sequence that are at same positions as positions of the respective elements of the input signal. If a retransmission request receiver receives a retransmission request, the modulator and transmitter perform the above processing using the operation data as an input signal. | 12-04-2014 |
20140301500 | COMMUNICATION DEVICE AND COMMUNICATION METHOD - A computational processor uses a binary signal, being a set of 1- or 0-valued elements of a same number as a number of elements in an input signal, to generate computational data whose elements are exclusive OR values between each element of the input signal and a corresponding element in the binary signal at a same position. The modulator | 10-09-2014 |
20140219371 | COMMUNICATION DEVICE AND COMMUNICATION METHOD - A modulator generates modulation signals from input signals. A combiner arranges subcarrier modulation signals based on the modulation signals in order thereby to generate a compound matrix. The shifter shifts elements of each row of the compound matrix to generate shift matrix. An IFFT calculator subjects the shift matrix to inverse fast Fourier transformation to generate inverse transformation matrix. A maximum detector detects a column with a highest peak-to-average power ratio among columns of the inverse transformation matrix. A minimum detector detects an inverse transformation matrix including a column with a lowest peak-to-average power ratio among columns of inverse transformation matrices detected by the maximum detector. A transmitter generates a transmission signal based on baseband signals generated from each column of the inverse transformation matrix detected by the minimum detector, and transmits the transmission signal. | 08-07-2014 |
20140198881 | COMMUNICATION APPARATUS AND COMMUNICATION METHOD - A communication apparatus comprises an inserter that inserts an element having a value of 0 or nearly 0 into a predetermined position of a modulated signal to generate inserted data; an operator that adds a pilot signal comprising a data series of which the elements at the positions corresponding to the predetermined positions in the modulated signal are multiplied by a first amplitude coefficient and the elements other than the elements multiplied by the first amplitude coefficient are multiplied by a second amplitude coefficient to the inserted data to generate a post-operation data; an IFFT unit that performs IFFT on the post-operation data; and a transmitter that generates a baseband signal based on the post-operation data on which the IFFT is performed and transmits a transmission signal generated from the baseband signal. | 07-17-2014 |
20140179327 | RELAYING DEVICE - A relaying device includes an uplink interface that continuously receives an audio signal in communication, a wireless apparatus interface to which a repeater acting as a wireless relaying apparatus is connected, a voice buffer that buffers the audio signal, and a control unit. The control unit performs a VOX processing of detecting whether or not a level of the audio signal is equal to or higher than a preset threshold. When the level of the audio signal is equal to or higher than the threshold, the control unit starts buffering the audio signal in the voice buffer, and requests the repeater to reserve a channel. After receiving, from the repeater, a reply indicating that a channel has been reserved, the control unit reads the buffered audio signal from the voice buffer, and transfers this audio signal to the repeater. | 06-26-2014 |
20140177516 | RELAYING DEVICE - The present invention relates to a relaying device which performs the individual calling in response to not only a call incoming from a telephone but also a call incoming from a transceiver. When receiving a communication request from another device over a network, the relaying device determines if this communication request is accompanied by the wireless-device specifying information (ID). When the communication request is not accompanied by the ID, the relaying device sends a signal for prompting another device to input the ID. When the ID is sent in response to the sent signal, the relaying device instructs the relaying wireless device to call the wireless terminal device specified by this ID. In addition, when the communication request is accompanied by the ID, the relaying device instructs the relaying wireless device to call the wireless terminal device specified by this ID. | 06-26-2014 |
20140177515 | RELAYING DEVICE - A relaying device is provided, which can mediate by using communications of a wireless apparatus without clipping off the beginning of verbal communication. The relaying device includes: a network interface that receives an audio signal as a group of packet trains via a network; a wireless apparatus interface to which a wireless apparatus is connected; a voice buffer that temporarily stores the audio signal; and a control unit that starts temporarily storing the audio signal in the voice buffer and requests the wireless apparatus to reserve a channel, when a leading packet of the group of packet trains is received, and that reads the temporarily stored audio signal from the voice buffer and transfers the audio signal to the wireless apparatus, after receiving from the wireless apparatus a reply indicating that a channel has been reserved. | 06-26-2014 |
20140140421 | Communication Apparatus and Communication Method - The communication apparatus comprises a modulator that modulates an input signal to generate a modulated signal; an inserter that inserts a predetermined element into the modulated signal at a predetermined position to generate inserted data of which the number of elements is equal to a size of Fast Fourier Transformation (FFT); a calculator that calculates Peak-to-Average Power Ratio (PAPR) of a baseband signal corresponding to the inserted data; and a transmitter transmits a transmission signal corresponding to the baseband signal based on the calculated PAPR. | 05-22-2014 |
20140119274 | RELAYING DEVICE AND COMMUNICATION SYSTEM - A relaying device includes a wireless apparatus interface, a signal processing unit connected to the wireless apparatus interface, a network interface, and a packet processing unit connected to the network interface. The relaying device is provided with multiple communication paths including the wireless apparatus interface, the signal processing unit, and the packet processing unit, and each communication path has a mixing unit configured to additively synthesize an uplink audio signal and a downlink audio signal of other communication path to the uplink audio signal and input the synthesized signal to the packet processing unit, and configured to additively synthesize an uplink audio signal and a downlink audio signal of other communication path to the downlink audio signal and input the synthesized signal to the signal processing unit. | 05-01-2014 |
20130315322 | COMMUNICATION DEVICE AND COMMUNICATION METHOD - A modulator | 11-28-2013 |
20130287213 | ELECTRONIC DEVICE - An electronic device with a speaker, an amplifier for driving the speaker and a speaker grill provided on the front surface of the speaker includes a pickup detection unit for detecting that the electronic device has been picked up from water and a water discharge sound generation unit for generating a water discharge sound signal for discharging water having entered inside the speaker grill according to the detection of the pickup from the water and inputting the generated water discharge sound signal to the amplifier. | 10-31-2013 |
20130285809 | ELECTRONIC APPARATUS - The electronic apparatus includes a submergence detector for detecting submergence of the electronic apparatus in the water and retrieval thereof, a light-emitting device provided within an enclosure of the electronic apparatus, an illumination circuit for lighting the light-emitting device when an illumination signal is input, a controller for causing the light-emitting device to blink by generating the illumination signal at prescribed blinking intervals at least during a period from a point of submergence to a point of retrieval of the electronic apparatus and inputting the illumination signal to the illumination circuit, and a power control circuit for activating the controller by supplying electric power thereto if the electric power is not supplied to the controller when the submergence detector detects submergence. | 10-31-2013 |
20130279625 | Communication Device and Communication Method - The modulator creates modulated signals from input signals. The series/parallel converter creates subcarrier modulated signals from the remaining data and modulated signals. The arithmetic operator arranges and combines a first number of elements of the subcarrier modulated signals from the first one and a second number of elements of a data series from the first one each multiplied by a given amplitude coefficient to create arithmetic operation data. The IFFT executor executes the inverse fast Fourier transformation of the arithmetic operation data. The combiner creates baseband signals from the arithmetic operation results. The determiner calculates the peal-to-average power ratio of the baseband signals. The processing of the arithmetic operator to the determiner is repeated while changing at least one of given numbers until the baseband signals complying with a given criterion are detected. The transmitter creates transmission signals from the baseband signals and transmits the transmission signals via an antenna. | 10-24-2013 |
20130254251 | COMMUNICATION APPARATUS AND COMMUNICATION METHOD - A series generator divides a data series having an autocorrelation property equally into a certain number to generate subdata series. A modulator multiplies a predetermined amplitude coefficient and a unique number by each element of the subdata series, respectively, and rearranges the subdata series and synthesizes the rearranged subdata series to generate the modulation data. An IFFT unit performs an IFFT on the modulation data. The calculator divides the calculation result equally into the certain number to generate the sub calculation results, and multiplies an equalization coefficient by each element of the sub calculation results. A synthesizer generates a baseband signal by arranging the sub calculation results, so that an arranged position corresponds to a position at the time of being divided equally, and synthesizing the arranged result. A transmitter generates the transmission signal and transmits it to another apparatus via an antenna. | 09-26-2013 |
20130251056 | COMMUNICATION DEVICE AND COMMUNICATION METHOD - A modulator generates a subcarrier modulation signal from an input signal, a parallel-serial converter generates a subcarrier modulation signal from the modulation signal. An IFFT calculator performs reverse Fast Fourier Transform on the subcarrier modulation signal, and a separator separates a calculation result into real part data and imaginary part data. A real part calculator performs a calculation on each element of the real part data to generate real part post-distribution data. An imaginary part calculator performs the data processing on the imaginary part data in the same manner, and generates imaginary part post-distribution data. A combiner combines the real part post-distribution data and the imaginary part post-distribution data to generate a baseband signal, and a transmitter which generates a transmission signal from the baseband signal to transmit generated transmission signal. | 09-26-2013 |
20130223560 | COMMUNICATION APPARATUS AND COMMUNICATION METHOD - A modulator generates a modulation signal from an input signal, and a serial-parallel converter generates a subcarrier modulation signal from the modulation signal. An IFFT unit performs an inverse fast Fourier transformation on the subcarrier modulation signal, and a decomposer decomposes a calculation result into a real part data and an imaginary part data. A calculator applies a predetermined calculation with respect to each element the value of which is equal to or greater than a positive threshold value and each element the value of which is equal to or less than a negative threshold value among the real part data and the imaginary part data. A synthesizer synthesizes the real part data and the imaginary part data to generate a baseband signal, and a transmitter generates a transmission signal from the baseband signal, and transmits it to another apparatus via an antenna. | 08-29-2013 |
20130215994 | COMMUNICATION APPARATUS AND COMMUNICATION METHOD - A serial-parallel converter generates a subcarrier modulation signal from a modulation signal which is generated from the input signal by a modulator. An IFFT unit performs an inverse fast Fourier transformation on the subcarrier modulation signal. A divider divides a calculation result to generate first subdata. A disperser adds dispersion coefficients to elements of first subdata. A sorter generates second subdata from post-dispersion first subdata. An operator performs a predetermined calculation using elements in the same line of the post-dispersion first subdata and second subdata. A corrector subtracts correction coefficients from elements of post-average first subdata. A synthesizer arranges post-correction first subdata in positions at the time of division and synthesizes them to generate a baseband signal. A transmitter generates a transmission signal to transmit. | 08-22-2013 |
20130202060 | COMMUNICATION APPARATUS AND COMMUNICATION METHOD - A modulator generates a modulation signal from an input signal, and a serial-parallel converter generates a subcarrier modulation signal from the modulation signal. An IFFT unit performs an inverse fast Fourier transformation on the subcarrier modulation signal to generate first data. An operator multiplies respective elements of the first data by amplitude coefficients, and further adds dispersion coefficients to the multiplication result, the amplitude coefficients being real numbers other than 0 defined for the respective elements, at least one of the amplitude coefficients having a value other than 1, the dispersion coefficients being complex numbers defined for the respective components, and at least one of the dispersion coefficients having a value other than 0. Then, data symbols are generated based on a calculation result. A transmitter transmits a transmission frame including the data symbols to another apparatus via an antenna. | 08-08-2013 |
20130195098 | COMMUNICATION APPARATUS AND COMMUNICATION METHOD - A modulator generates a modulation signal from an input signal. A serial-parallel converter generates a subcarrier modulation signal from the modulation signal. An IFFT unit performs an inverse fast Fourier transformation on the subcarrier modulation signal, generating first data. A decomposer decomposes the first data into real data and imaginary data. An operator performs a predetermined operation using a predetermined threshold value, a boundary value and the real data, generating positive data and negative data. Another operator performs a similar operation on the imaginary data. A generator adds the positive data and negative data based on the real data, and adds the positive data and negative data based on the imaginary data, generating real operation data and imaginary operation data. A synthesizer synthesizes both operation data to generate a baseband signal. A transmitter generates a transmission signal from the baseband signal, and transmits it to another apparatus via an antenna. | 08-01-2013 |
20130188631 | COMMUNICATION APPARATUS AND COMMUNICATION METHOD - A modulator generates a modulation signal from an input signal. A serial-parallel converter generates a subcarrier modulation signal from the modulation signal. An inserter inserts a transmission-side data series, generated by multiplying a data series having an autocorrelation property by a predetermined series amplitude coefficient, in a signal for synthesis, generated by multiplying the subcarrier modulation signal by a predetermined signal amplitude coefficient, in such a way that elements in the signal for synthesis and elements in the transmission-side data series are alternately positioned, thereby generating first data. An IFFT unit performs an inverse fast Fourier transformation on the first data. A separator generates a baseband signal based on first half data of an operation result from the IFFT unit. A transmitter generates a transmission signal from the baseband signal, and transmits it to another apparatus via an antenna. | 07-25-2013 |
20130128996 | COMMUNICATION APPARATUS AND COMMUNICATION METHOD - A modulator generates a modulation signal from an input signal. A serial-parallel converter generates a subcarrier modulation signal from the modulation signal. A first operator generates first data by multiplying a predetermined non-singular matrix by the subcarrier modulation signal. A second operator generates second data by multiplying a matrix calculated by multiplying a predetermined transformation matrix by the predetermined non-singular matrix by the subcarrier modulation signal, or multiplying the predetermined transformation matrix by the first data. A synthesizer generates a baseband signal from data obtained by adding the second data to the first data, or data obtained by subtracting the second data from the first data. A transmitter generates a transmission signal from the baseband signal, and transmits the transmission signal to another apparatus via an antenna. | 05-23-2013 |
20130107983 | COMMUNICATION APPARATUS AND COMMUNICATION METHOD | 05-02-2013 |
20130107982 | COMMUNICATION APPARATUS AND COMMUNICATION METHOD | 05-02-2013 |
20130084819 | GAIN CONTROL CIRCUIT, FM RECEIVER AND COMPUTER PROGRAM PRODUCT - The present invention provides a gain control circuit for an FM receiver that can reduce a reproduced audio output according to the magnitude of the noise component of an intended signal included in a received signal. | 04-04-2013 |
20120194345 | PORTABLE ELECTRONIC DEVICE - A drop detection part that detects drop of the device into the water, a light emitting body disposed in the housing, and a light-emission control circuit that makes the light emitting body emit light when the drop detection part detects the drop into the water are provided, and the rear face of the housing is made translucent, a lower part of a sealing member sealing the front housing and the rear housing is also made translucent, and a cover part covering the light emitting body is formed on this translucent part. | 08-02-2012 |
20120191335 | TARGET IDENTIFICATION DEVICE AND TARGET MOVEMENT PREDICTION METHOD - A target identification device in a user object includes: a user information obtaining part and a target information obtaining part obtaining a position, a speed over ground and a course over ground of the user object and a target object; a processor that calculates a CPA distance and a TCPA with respect to the target object relative and the user object, based on the positions, the speeds over ground and the courses over ground of the user object and the target object. The processor replaces the course over ground of the user object with a direction toward the target object and calculates the CPA and the TCPA when the speed over ground of the user object is a low speed determination value or less. | 07-26-2012 |
20120149311 | WIRELESS COMMUNICATION APPARATUS AND WIRELESS COMMUNICATION METHOD - A wireless communication apparatus is provided for selecting an optimum frequency even when radio wave conditions have changed. A wireless communication apparatus provided with a frequency selector for selecting an optimum frequency for establishing a link for mutually transmitting and receiving has a transceiver for transmitting radio waves to another wireless communication apparatus and receiving from the other wireless communication apparatus radio waves responding to those transmitted radio waves, a quality analyzer for analyzing communication quality indicating the condition of the link from the received radio waves, and a quality updater for updating the analyzed communication quality on the basis of time elapsed from when the radio waves were received. In addition, the frequency selector selects the optimum frequency on the basis of the updated communication quality. | 06-14-2012 |
20120147997 | PREAMBLE GENERATING APPARATUS, PREAMBLE GENERATING METHOD, AND COMPUTER READABLE RECORDING MEDIUM STORING PROGRAM - A preamble generating apparatus used for synchronization of a reception apparatus in an orthogonal frequency division multiplexing system and generating a preamble to be added to a beginning of data at a time of communication, receives preamble length identifying information and position specifying information, and generates a plurality of elements constituting a preamble according to a predetermined sequence based on those information. The preamble generating apparatus creates a preamble model, and generates a plurality of preambles by setting the generated elements at positions of elements in element deciding information included in the preamble model, the positions indicating elements in the preamble model which are to be used in data communication. The preamble generating apparatus calculates PAPRs respectively corresponding to the plurality of preambles, and compares the PAPRs of the preambles with one another to decide the preamble corresponding to a minimum PAPR as a preamble to be used in communication. | 06-14-2012 |
20120093264 | TONE SIGNAL CIRCUIT AND WIRELESS RECEIVER - In a tone signal circuit and a wireless receiver of the present invention, a digital signal in a frequency band including at least a tone signal component is input into a Goertzel filter. Further, an envelope of an output from the Goertzel filter is detected, and a derivative value of the envelope is derived. Then, if the derivative value is maintained to be equal to or greater than a first threshold value, it is determined that a first prerequisite for existence of the tone signal component is satisfied. The above tone signal circuit and the wireless receiver can perform highly-accurate tone detection in a small calculation amount. | 04-19-2012 |
20120043916 | PORTABLE ELECTRONIC DEVICE - A drop detection part that detects drop into the water, a light emission part, and a light-emission control circuit that makes the light emission part emit light when the drop detection part detects the drop into the water. Also, the light emission part may be disposed on the side to be turned up by buoyancy when the device is dropped into the water and the drop detection part may be disposed on the side to be turned down in the case of the drop into the water, for example. | 02-23-2012 |
20120001686 | HIGH FREQUENCY CIRCUIT - A high frequency circuit includes an amplifier part that includes a plurality of amplifier circuits amplifying a high frequency signal and connected in parallel, that synthesizes outputs of the amplifier circuit and that supplies the outputs to an antenna; a controller that outputs a low power signal during a low power mode in which the amplifier part operates at low power; and an operation suppressing circuit that disables one of the plurality of amplifier circuits based on the low power signal. | 01-05-2012 |
20110306290 | WIRELESS TERMINAL DEVICE, WIRELESS COMMUNICATION METHOD, AND WIRELESS COMMUNICATION SYSTEM AND PROGRAM - A wireless terminal device (TA) receives a downlink signal that is repeatedly transmitted from a pre registered home repeater when requesting communication, specifies an idle channel based on idle channel information that is included in the downlink signal, and using the frequency of the uplink signal of the idle channel requests communication permission from the relay device that provides the idle channel. When communication permission cannot be received from the relay device from which communication permission was previously requested, the wireless terminal device (TA) uses the same frequency as the frequency of the downlink signal from the home repeater to transmit a signal to the wireless terminal device (TB) of an intended other party requesting communication. | 12-15-2011 |
20110204921 | LEVEL CONVERSION CIRCUIT - Circuit blocks and respectively convert high-voltage logic signals in which two logical values are expressed by a first signal potential and a second signal potential into low-voltage logic signals in which the two logical values are expressed by a third signal potential at least as large as the first signal potential and a fourth signal potential that is the third signal potential to which a positive voltage has been added and which is no greater than the second signal potential, and outputs the converted logic signals. The transistors in the circuit block are of the form of replacing the respective transistors of the circuit block with elements of opposite polarity, so that when the third signal potential is changed and operation of one of the circuit blocks and becomes difficult, the other operates normally. Consequently, stable level conversion can be accomplished. | 08-25-2011 |
20110199960 | WIRELESS COMMUNICATION SYSTEM, RELAY SYSTEM, REPEATER DEVICES AND SYNCHRONIZATION METHOD - A wireless communication system comprises a relay system including a plurality of relay devices and a plurality of wireless terminal devices. Each relay device transmits control information to the wireless terminal device which is registered in the own relay device, and each wireless terminal device selects, based on the control information received from the relay device which registers the own wireless terminal device, a channel which is currently able to relay a communication among channels respectively allocated to the relay devices to establish a communication between the wireless terminal devices. Each relay device acquires information configuring the control information via a communication line and causes a downlink signal wirelessly transmitted by the own relay device to synchronize with a communication signal, and each wireless terminal device maintains, when shifting a channel for communication to another channel, a synchronized state established in a channel prior to shifting. | 08-18-2011 |
20110199959 | WIRELESS COMMUNICATION SYSTEM, WIRELESS COMMUNICATION METHOD THEREOF, REPEATER DEVICES AND WIRELESS TERMINAL DEVICES - Plural repeaters ( | 08-18-2011 |
20110199958 | RELAY SYSTEM, RELAY DEVICE AND SYNCHRONIZATION METHOD - When no synchronization signal is transmitted over a system bus ( | 08-18-2011 |
20110194486 | RELAY DEVICE, WIRELESS COMMUNICATION METHOD, AND WIRELESS COMMUNICATION SYSTEM - A frequency band of 12.5 kHz that two repeaters ( | 08-11-2011 |
20110189946 | WIRELESS COMMUNICATION SYSTEM, WIRELESS COMMUNICATION METHOD, WIRELESS COMMUNICATION TERMINAL DEVICE, RELAY DEVICE, AND RELAY SYSTEM - Wireless terminal devices (TA) to (TH) each detects whether channel information received from each of repeaters ( | 08-04-2011 |
20110189945 | WIRELESS COMMUNICATION SYSTEM, WIRELESS COMMUNICATION METHOD, RELAY DEVICE, AND WIRELESS TERMINAL DEVICE - There is provided a wireless communication system which causes a wireless terminal to select a relay device among plural relay devices connected together via a communication line when the wireless terminal attempts to communicate with another wireless terminal. The relay device has an information acquiring unit, a calling determining unit, and an information adding unit. The wireless terminal has an information analyzing unit which analyzes whether or not the own device is included in a communication counterparty of calling information when the calling information is included in communication information, a priority comparing unit which determines whether or not a priority level of the calling information is higher than that of a current communication when the own device is included, and a channel changing unit which changes a channel to that of another relay device of the calling information when the priority level of the calling information is higher. | 08-04-2011 |
20110110465 | FSK RECEIVER - In an FSK receiver according to the present invention, a correction operation for a DC offset component is performed based on a maximum value and a minimum value of a demodulation signal. If a difference between the maximum and minimum values is less than a predetermined threshold value TH | 05-12-2011 |
20110051855 | FRAME SYNC DETECTING CIRCUIT AND FSK RECEIVER USING THE SAME - A frame sync detecting circuit and FSK receiver sequentially derive a moving average value (□) from oversample values of a received word pattern, for given symbol periods, and a difference between the moving average value and an average value for the given symbol periods in a given sync word pattern is determined as DC offsets Δf. Subsequently, the DC offset Δf is subtracted from the received word pattern, and correlation processing with respect to the sync word pattern is performed to determine a correlation value (). If the correlation value exceeds a predetermined threshold, it is determined that a sync word candidate has been received, and symbol values of the received word pattern after the DC offset correction are compared with respective symbol values of the sync word pattern. A sync word pattern detection is determined if errors in the symbols are within a given range. | 03-03-2011 |
20110050302 | CHARGE PUMP CIRCUIT AND PLL CIRCUIT USING THE SAME - A charge pump circuit ( | 03-03-2011 |
20110019788 | CLOCK REGENERATION CIRCUIT AND RECEIVER USING THE SAME - Provided are a clock regeneration circuit and a receiver, wherein difference values (V | 01-27-2011 |
20100253438 | Phase Locked Loop Circuit - A PLL circuit comprises a phase detector, a charge pump, a loop filter, a voltage-controlled oscillator (VCO), and two variable voltage sources. The phase detector and the charge pump each comprises low-voltage transistors, and operates with a fixed supply voltage VCC1 (e.g., 5 V) which is a potential difference applied from the variable voltage source of a power-supply voltage VL and the variable voltage source of a power-supply voltage VDC (=VL+VCC1). A tuning control signal VC generated by integrating an output current signal of the charge pump using the loop filter is input to the VCO having an input voltage range of the tuning control signal from 0 V to VCC2 (e.g., 16 V). At this time, the output voltage range of the tuning control signal is from VL to VDC, but the output voltage range is expanded to cover the full input voltage range from 0 V to VCC2 by controlling the output voltages VL, VDC of the variable voltage sources, thereby allowing the VCO to output an output signal with a desired oscillation frequency. | 10-07-2010 |
20100208647 | COMMUNICATION APPARATUS AND COMMUNICATION CONTROL PROGRAM - A communication apparatus includes an input unit that inputs names of repeater stations to which the local communication apparatus and a communication counterpart belong respectively, a memory storing identification information of each repeater station, and information needed to set a communication path from the repeater station to another repeater station as communication path setting information associated with the name of the repeater station, an information retrieving section that retrieves identification information of the repeater station, and information needed to set a communication path to another repeater station from the associated information stored in the memory based on the input name of the repeater station, and a communication frame generating section that generates a communication frame including the identification information of the repeater station, and the information needed to set the communication path from the repeater station to which the local communication apparatus belongs to the repeater station of the communication counterpart from a result of the information retrieval. | 08-19-2010 |
20100124168 | REPEATER MONITOR SYSTEM AND REPEATER MONITOR METHOD - A monitor terminal transmits a monitor request command to monitor a repeater station designated by an operator to a monitor server via the Internet. The monitor server detects a monitor station located in the communication range of the designated repeater station from the content of the received monitor request command, and transmits a monitor instruction command to the detected monitor station via the Internet. The monitor station intercepts a radio signal during transmission from the repeater station to a radio communication device or vice versa. Upon reception of the monitor instruction command, the monitor station transmits the intercepted radio signal as monitor data to the monitor server. The monitor server transfers the monitor data to the monitor terminal. Upon reception of the monitor data transferred from the monitor server, the monitor terminal radio-transmits the received monitor data using a radio wave format receivable by the radio communication device. | 05-20-2010 |
20100098283 | MICROPHONE - A microphone which does not need a hanger plate structure is provided. A conductive hanger knob is provided at the back of the rear case of a microphone case. The hanger knob has three layers of a conductive shaft part, an insulator part and a conductive bolt part in the named order from its center. The shaft part is electrically insulated from the bolt part. A notch that locks the bolt part of the hanger knob at a hanger surface is formed at a conductive hanger hook on which the microphone is hooked via the hanger knob. A support spring portion disposed at the back of the hanger surface urges the shaft part of the hanger knob locked at the notch in a direction of pushing the shaft part back toward the hanger surface. This provides electric conduction between the shaft part and the bolt part via the hanger hook. | 04-22-2010 |
20100054174 | DATA COMMUNICATION CONTROL APPARATUS, DATA COMMUNICATION SYSTEM, DATA COMMUNICATION METHOD, AND COMPUTER-READABLE STORAGE MEDIUM RECORDING DATA COMMUNICATION PROGRAM - A user location monitoring unit of a data communication control apparatus monitors a message sent from a wireless device via a repeater. Upon detection of a change in the location of the wireless device, the user location monitoring unit updates the location information in the database and notifies via the Internet a management server of the location change. Upon receipt of the message via the Internet, a destination address confirming and correcting unit of the data communication control apparatus uses the user ID of a destination wireless device as a search keyword to search the database. In turn, the destination address confirming and correcting unit corrects the destination address of the message to the latest address of the pertinent user ID and outputs the corrected message to a received message forwarding unit. | 03-04-2010 |
20100052784 | LOW NOISE AMPLIFIER - A low noise amplifier having a wide operating frequency band and a high dynamic range is provided. A transformer having a secondary winding connected between an input terminal to which an input signal is applied and a positive differential output terminal, and a primary winding connected between a negative differential output terminal and an input node is provided as a feedback circuit between a cascode amplifier circuit, which includes transistors and a resistor, and an output circuit, which includes a transistor and a constant current source. Selective use of a transformer whose leakage inductance has an adequate value as the feedback transformer can realize a low noise amplifier which has a wide operating frequency band and a high dynamic range. | 03-04-2010 |
20090298452 | METHOD FOR SCANNING FREQUENCY, RECEIVER, AND COMPUTER-READABLE RECORDING MEDIUM - A receiver according to the present invention has a reception unit which receives reception signals; a storage unit which stores a band table, in which a plurality of frequency bands serving as scanning targets are registered so that the frequency bands correspond to band identifiers, respectively, and a link table, in which any number of the band identifiers registered in the band table are registered so that the band identifiers correspond to a link identifier; a control unit which, when the link identifier is specified, refers to the band table and the link table, obtains the frequency bands corresponding to the link identifier, carries out scanning within the frequency band for each of the frequency bands, and sequentially sets reception frequencies of the reception signals; and a frequency synthesizer. | 12-03-2009 |
20090268659 | REPEATER, WIRELESS COMMUNICATION SYSTEM, CONTROL METHOD AND RECORDING MEDIUM - The present invention provides a repeater that can transmit the same signal received by plural repeaters to the recipient wireless communication device without redundancy of the signal, a wireless communication system, a control method, and a recording medium. | 10-29-2009 |
20090262924 | TONE SIGNAL DETECTOR, TONE SIGNAL DETECTION METHOD, AND COMPUTER READABLE RECORDING MEDIUM - Upon selection of the frequency of a tone signal, a local oscillator generates a frequency signal having a shift frequency corresponding to the frequency of this tone signal. A frequency shifter generates a frequency-converted signal by shifting a frequency of the tone signal by a shift frequency of the frequency signal generated by the local oscillator. A BPF removes an image signal from the frequency-converted signal which the frequency shifter generated, and a normalizer normalizes the amplitude of the signal output from the second BPF. By this, even if the amplitude of the tone signal is small, the amplitude thereof is unified to a suitable magnitude. For this reason, even if there is a difference in the amplitude of the tone signal, the tone signal can be detected reliably and an false detection can be prevented. | 10-22-2009 |
20090220117 | MICROPHONE AND MICROPHONE HANGER-HOOK - A conductive hanger plate having a flat external face and a conductive hanger knob are so provided as to be electrically isolated with each other at the same side of the external face of a non-conductive rear casing of a microphone casing. A conductive hanger hook hanging the microphone casing via the hanger knob is provided with a notch for catching the hanger knob. The hanger hook has a first elastic member which pushes the caught hanger knob in a direction toward a hanger face, and second elastic members which urges the hanger plate in a direction apart from the hanger face. | 09-03-2009 |
20090195312 | DIFFERENTIAL AMPLIFIER - A differential amplifier comprises a left amplifier having transistors, a right amplifier having transistors, a negative feedback network having a resistor, and a negative feedback network having a transformer with a center tap. Phase compensation networks comprising a capacitor and a resistor, a capacitor and a resistor, and a capacitor and a resistor are further added to the amplifier. Both ends of a secondary winding of the transformer are connected to the output terminals of the right and left amplifiers, and the center tap of the secondary winding is grounded, so that a differential amplified output signal can be fed back to a single-phase input using one transformer, thereby reducing a cost and an area. | 08-06-2009 |
20090111396 | AM TRANSMITTER AND MODULATION METHOD USING SAME - An AM (Amplitude-Modulated) transmitter capable of improving modulation distortion is provided. An adder adds a modulation signal to a pre-set power reference signal. An APC (Automatic Power Control) amplifier compares a level of a detecting signal outputted by the LPF (Low Pass Filter) with a level of an adder signal. The APC amplifier, based on the comparison result, generates a gain controlling signal that makes a difference between a level of the detecting signal and level of the signal approach zero and feeds the gain controlling signal to a power amplifier. The power amplifier modulates the signal outputted from the amplifier by the gain controlling signal and power-amplifies the modulated signal according to a level of the gain controlling signal. Since the APC amplifier feeds the gain controlling signal to the power amplifier, a modulation degree does not depend on a nonlinear distortion characteristic of the power amplifier. | 04-30-2009 |
20090108937 | LOW NOISE AMPLIFIER AND DIFFERENTIAL AMPLIFIER - In a double-loop negative feedback low noise amplifier having double negative feedback paths by a feedback transformer and a feedback resistor added to a cascode amplifier comprising transistors and a resistor, a phase compensation circuit comprising a capacitor and a resistor is added between the output terminal of the double-loop negative feedback low noise amplifier and the input terminal of the cascode amplifier, i.e., the input terminal of the input transistor, and a phase compensation circuit comprising a capacitor and a resistor is added to the upper-stage transistor of the cascode amplifier, i.e., the input terminal of the upper-stage transistor. Those phase compensation circuits enable a low noise negative feedback amplifier which maintains a high feedback loop gain to a high frequency band, has a wider bandwidth than a conventional one, and has a high dynamic range. | 04-30-2009 |