Patent application number | Description | Published |
20120245681 | FLOW ESTIMATION IN A BLOOD PUMP - The flow rate of blood in an implantable blood pump is determined at least in part based on a parameter related to thrust on the rotor of the pump. The parameter may be a parameter related to displacement of the rotor along its axis, such as a function of the back electromotive force generated in one or more coils of the stator. The back electromotive force may be measured during open-phase periods of a particular coil or set of coils, during which no power is applied to the coil or set of coils by the motor drive circuit. The parameter related to thrust may be used in conjunction with the speed of rotation of the rotor, the magnitude of current supplied to the rotor, or both to determine the flow rate. The pump may be controlled responsive to the determined flow rate. | 09-27-2012 |
20140100413 | SUCTION DETECTION ON AN AXIAL BLOOD PUMP USING BEMF DATA - The presence or absence of a suction condition in an implantable blood pump is determined at least in part based on a parameter related to flow, such as a parameter related to thrust on the rotor of the pump. A local extreme of the parameter representing the minimum flow during ventricular diastole in an earlier interval is used to establish a threshold value. A value of the parameter representing the minimum flow during ventricular diastole in a later interval is compared to this threshold. If the comparison indicates a substantial decline in the minimum flow between the earlier and later intervals is associated with a suction condition. During the absence of a suction condition, the threshold is continually updated, so that the system does not indicate presence of a suction condition if the flow decreases gradually. | 04-10-2014 |
20140357937 | AXIAL FLOW PUMP PRESSURE ALGORITHM - The presence or absence of a high pressure condition in an implantable blood pump is determined at least in part based on a comparison between a determined amount of differential pressure across the pump and a pressure threshold value. The amount of differential pressure parameter may be determined based at least in part on a parameter related to flow, such as a parameter related to thrust on the rotor of the pump. In response to determining the presence of a high pressure condition, an updated speed of rotation of the rotor that is less than the rotor's initial speed may be determined. The rotor's speed may be increased when the flow rate of blood is determined to be at least equal to a flow recovery threshold value. | 12-04-2014 |
Patent application number | Description | Published |
20120198745 | RAPID ATTACHMENT/DETACHMENT MECHANISM FOR WEAPON-MOUNTABLE LIGHTING DEVICES - A mechanism adapted for rapid attachment/detachment of a lighting device to a rail system of a host weapon system. The mechanism includes a body, a fixed rail clamp, and a floating rail clamp that is adjustably attached to the body in an opposing manner to the fixed rail clamp to provide a clamping effect therebetween. The floating rail clamp has a recess in a surface opposite the fixed rail clamp. A holding screw passes through a bore in the fixed rail clamp, and a clamp screw passes through a slot in the floating rail clamp and is threaded into one end of the holding screw. An oppositely-disposed end of the clamp screw protrudes within the recess of the floating rail clamp, and a cam arm has a first end pivotably coupled to the second end of the clamp screw and an oppositely-disposed distal end that protrudes from the recess. | 08-09-2012 |
20120206799 | BINOCULARS WITH INTEGRATED LASER DESIGNATOR/ILLUMINATOR FOR ILLUMINATING AN OPTICAL FIELD OF VIEW - Binoculars with an integrated laser light source capable of illuminating the optical field of view through the binoculars to provide concise and effective viewing under limited visibility conditions. The integrated light source generates a coherent laser light beam that has variably adjustable divergence. | 08-16-2012 |
20120206908 | LASER SIGNALING BUOY AND METHOD OF USING - A signaling buoy and method suitable for emitting a light signal over long distances in marine environments. The buoy includes a watertight enclosure having a compartment, an aperture at an upper end of the enclosure for emitting a laser light beam therethrough, a laser light source disposed within the enclosure for generating the light beam, and a battery within the enclosure for powering the light source. Electrical contacts are disposed on an exterior of the enclosure and are adapted to complete an electrical circuit when an electrical short exists therebetween to conduct electrical power from the battery to the laser light source. The buoy is configured to float upright in water with the electrical contacts submersed in the water. | 08-16-2012 |
20120216440 | MODULAR POWER SUPPLY FOR USE IN A WEAPON MOUNTABLE DESIGNATOR/ILLUMINATOR UNIT - A weapon-mountable designator/illuminator unit having a light source adapted to generate a light beam in a direction away from the unit. The light beam is variable between a collimated light beam and a divergent light beam for, respectively, designating a target and illuminating a target area of the weapon. At least a first modular power supply is adapted for installation in the designator/illuminator unit. The power supply includes a cage adapted to receive a power source, a first end adapted to be received within the designator/illuminator unit, and an end cap adapted to be exposed when the power supply is assembled with the unit. The power supply is adapted to deliver power from its power source to the light source of the designator/illuminator unit. The end cap may contain a light source for generating a light beam in addition to the light beam generated by the designator/illuminator unit. | 08-30-2012 |
Patent application number | Description | Published |
20140194723 | MULTI-LAYER COATING FOR OPTOACOUSTIC PROBE - Disclosed is an optoacoustic probe with a coated transducer assembly. The probe includes a transducer assembly with a multi-layer coating on the active end thereof. The multi-layer coating includes a layer of parylene and at least two layers of metal. In an embodiment, the multi-layer coating includes a layer of nickel, at least one layer of parylene, and a layer of gold. | 07-10-2014 |
20140206978 | PROBE WITH OPTOACOUSTIC ISOLATOR - An optoacoustic probe including an ultrasound transducer array, an acoustic lens and a light path separated from the transducer array by an isolator to mitigate light energy from the light path from reaching the transducer array. The isolator being formed from a mixture including a flexible carrier, a coloring and between 10% and 80% by volume micro-bubbles. The isolator mixture being adapted to both absorb light energy and the optoacoustic response to light energy. In an embodiment, an optoacoustic probe also comprises an optical window and/or a diffuser, and the isolator also separating the transducer array from these components. | 07-24-2014 |
20150018662 | PROBE WITH OPTOACOUSTIC ISOLATOR - An optoacoustic probe including an ultrasound transducer array, an acoustic lens and a light path separated from the transducer array by an isolator to mitigate light energy from the light path from reaching the transducer array. The isolator can be formed from a mixture including a carrier material and between 10% and 80% by volume micro-bubbles. The isolator can be adapted to absorb, reflect or scatter light energy and absorb the optoacoustic response to light energy. In an embodiment, an optoacoustic probe also comprises an optical window and/or a diffuser, the isolator also separating the transducer array from these components. | 01-15-2015 |
Patent application number | Description | Published |
20090115903 | AUDIO/VIDEO SEPARATOR - An audio/video separator provides a high-performance and cost-effective solution to analog TV reception with only one A/D converter and a minimum of analog IF components. The apparatus may operate on a digitized TV signal and, when integrated with a digital video processor, process video signals while separating audio signals. The resultant audio and video signals may be considered to have excellent signal quality due to highly optimized demodulation architecture and digital signal processing techniques on both audio and video data paths. | 05-07-2009 |
20090262864 | SYMMETRICAL DATA SIGNAL PROCESSING - In a digital communications receiver configured to receive, via a communications channel, a received first signal representing a sequence of symbols, each symbol being encoded to be representative of data bits, a method of processing the received signal includes adjusting a magnitude, filtering, and applying cyclic prefix restoration, to the received signal to produce a second signal, converting the second signal from time domain to frequency domain to produce a frequency domain signal, and determining a first quantity of values representing a first portion of the symbols by evaluating a relationship of channel values representing characteristics of the communications channel and a second quantity of values representing a portion of the frequency domain signal, the first quantity being smaller than the second quantity. | 10-22-2009 |
20090295995 | RAPID CHANNEL SIGNAL IDENTIFICATION - An apparatus, for use in a receiver configured to receive electronic signals, for identifying digital signals that are available for reception, includes a timing recovery device configured to receive an incoming signal, related to a transmitted signal, the incoming signal having a first symbol rate, and to re-sample the incoming signal to provide a second symbol rate, and an analyzer that is in communication with the timing recovery device and that is configured to make a determination as to whether a difference between the second symbol rate and a third symbol rate of a transmitter providing the transmitted signal is within an acceptable tolerance and to use the determination in an analysis of whether the transmitted signal is available for reception. | 12-03-2009 |
Patent application number | Description | Published |
20090067486 | Method and apparatus for joint decoding and equalization - The present invention is related to joint trellis decoding and equalization using a decision feedback equalizer. | 03-12-2009 |
20090296799 | Channel identification, emulation, and frame synchronization for digital television signals - The present invention is related to channel identification, equalizer initialization, and framing synchronization of GB 20600-2006 digital television signals. In one embodiment, the present invention provides, in a communications receiver having an equalizer that processes GB 20600-2006 digital television signals that include payload data, a method that initializes the equalizer coefficients for processing the payload data comprising: identifying a channel estimate based on correlation techniques; producing known, mock received data and filtering the mock, received data through the channel estimate to produce mock filtered data; adjusting the equalizer coefficients with the mock received data or the mock filtered data to obtain an initial equalizer setting; and processing the payload data with the initial equalizer setting. | 12-03-2009 |
20120281140 | COHERENT SYNCHRONIZATION AND FRAMING IN A DIGITAL TELEVISION RECEIVER - The current application is directed to maintaining the correct number of symbols in a protocol frame in a digital communications receiver, to prevent catastrophic failure due to dynamic multipath or cycle slips. Timing recovery and framing are coherent, facilitated by placing channel estimation directly into a larger timing recovery loop. | 11-08-2012 |
20140047497 | METHOD AND SYSTEM FOR SYMBOL-RATE-INDEPENDENT ADAPTIVE EQUALIZER INITIALIZATION - The current document is related to the equalization of digital communications signals, including GB 20600-2006 and ATSC digital television signals, and is directed to methods that initialize adaptive filters for processing payload data within equalizers. These methods may operate at a clock speed faster than the symbol transmission rate and are applicable to a multitude of digital communications standards and protocols. In certain implementations, the initialization method generates input records, from output of a pseudorandom number generator, and output records, from the output of a pseudorandom number generator and a channel estimate, that are decoupled from transmitted and received data and are used to adjust equalizer coefficients to an initialization setting suitable for processing payload data. | 02-13-2014 |