Patents
Literature
Hiro is an intelligent assistant for R&D personnel, combined with Patent DNA, to facilitate innovative research.
443 results about "Signal envelope" patented technology
Efficacy Topic
Property
Owner
Technical Advancement
Application Domain
Technology Topic
Technology Field Word
Patent Country/Region
Patent Type
Patent Status
Application Year
Inventor
Integrated transceiver with envelope tracking
InactiveUS20090045872A1Amplifier modifications to reduce non-linear distortionResonant long antennasTransceiverSignal envelope
A transceiver comprises an amplifying circuit for amplifying an input signal to produce an output signal. A power supply is operable for varying the level of power supplied to the amplifying circuit in response to variation of an input signal envelope directed to the power supply. A processing circuit is operable for digitally detecting the input signal envelope to provide variation of the power supply level. The processing circuit is further operable for digitally delaying the digital input signal envelope to time align the power supply level with the input signal.
Owner:COMMSCOPE TECH LLC
High efficiency amplification
InactiveUS7482869B2Fast corrective loopWide bandwidthHigh frequency amplifiersGain controlAudio power amplifierSignal envelope
A radio frequency amplification stage including an amplifier for receiving an input signal to be amplified and a power supply voltage; and a power supply voltage stage for supplying said power supply voltage, including a circuit for providing a reference signal representing the envelope of the input signal; a circuit for selecting one of a plurality of supply voltage levels in dependence on the reference signal; and a circuit for generating an adjusted selected power supply voltage, including an ac amplifier for amplifying a difference between the reference signal and one of the selected supply voltage level or the adjusted selected supply voltage level, and a summer for summing the amplified difference with the selected supply voltage to thereby generate the adjusted supply voltage.
Owner:SNAPTRACK
Integrated transceiver with envelope tracking
InactiveUS7715811B2Resonant long antennasAmplifier modifications to reduce noise influenceTransceiverSignal envelope
Owner:COMMSCOPE TECH LLC
Wireless local area network repeater with in-band control channel
InactiveUS20060063484A1Cost of device is highReduce disadvantagesInformation formatNetwork topologiesVariable-gain amplifierEngineering
A frequency translating repeater (200) for use in a WLAN environment includes an in-band management link. A signal received on an antenna (300) is split to provide signal detection in a detection and control unit (385) wherein detection is performed by detectors (370, 371) filters (375, 376), converters (380, 381) and a processor (385). Delay is added using delay lines (360, 361). The in-band signal envelope may be modulated with variable gain amplifier (330) and demodulated with detectors (370, 371) to establish the management link with higher protocol layer capability. Alternatively, a modern function at least partially compliant to 802.11 modulation may be used in parallel with the frequency translating repeater.
Owner:QUALCOMM INC
High efficiency modulating RF amplifier
InactiveUS20100001793A1Simple designImprove efficiencyReconfigurable analogue/digital convertersAmplififers with field-effect devicesAudio power amplifierPower switching
A high efficiency modulating RF amplifier (10) for amplitude modulating a signal defined by a phase information signal (1) and an envelope signal (2) comprises a power supply (30) arranged to provide an operating voltage under control of the envelope signal (2). The power supply (30) comprises a plurality of power supply stages (40) and a plurality of supply switches (50) coupled between the plurality of power supply stages (40) and the modulator (20). The power supply (30) is arranged to select one of the power supply stages (40) to provide the operating voltage under control of the envelope signal (2). The high efficiency modulator RF amplifier further comprises a modulator (20) for receiving the phase information signal (1), the envelope signal (2) and the operating voltage. The modulator (20) is arranged to provide an output signal of which an amplitude is modulated under control of the envelope signal (2).
Owner:KONINKLIJKE PHILIPS ELECTRONICS NV
Polar envelope correction mechanism for enhancing linearity of RF/microwave power amplifier
InactiveUSRE37407E1Modest bandwidthImprove linearityAmplifier modifications to reduce non-linear distortionElectric devicesPhase distortionAudio power amplifier
Linearity of an RF / microwave power amplifier is enhanced by an amplitude and phase distortion correction mechanism based upon signal envelope feedback, that operates directly on the RF signal passing through the power amplifier. A phase-amplitude controller responds to changes in gain and phase through the RF / microwave power amplifier signal path caused by changes in RF input power, DC power supply voltages, time, temperature and other variables, and controls the operation of a gain and phase adjustment circuit, so as to maintain constant gain and transmission phase through the RF / microwave power amplifier.
Owner:INTEL CORP
On frequency repeater with AGC stability determination
An on frequency repeater for wireless networks with feedback oscillation detection is disclosed. The on frequency repeater includes an automatic gain control loop which samples amplified signal envelope. The automatic gain control loop is monitored and a characteristic saw tooth pattern in the gain control loop indicating feedback oscillation is detected. A nonlinear gain expander circuit may be periodically activated to allow feedback oscillation detection in repeater applications employing linearized amplifiers.
Owner:INTEL CORP
Temporal and spatial shaping of multi-channel audio signals
A selected channel of a multi-channel signal which is represented by frames composed from sampling values having a high time resolution can be encoded with higher quality when a wave form parameter representation representing a wave form of an intermediate resolution representation of the selected channel is derived, the wave form parameter representation including a sequence of intermediate wave form parameters having a time resolution lower than the high time resolution of the sampling values and higher than a time resolution defined by a frame repetition rate. The wave form parameter representation with the intermediate resolution can be used to shape a reconstructed channel to retrieve a channel having a signal envelope close to that one of the selected original channel. The time scale on which the shaping is performed is shorter than the time scale of a framewise processing, thus enhancing the quality of the reconstructed channel. On the other hand, the shaping time scale is larger than the time scale of the sampling values, significantly reducing the amount of data needed by the wave form parameter representation.
Owner:AVAGO TECH WIRELESS IP SINGAPORE PTE +2
Method and apparatus for performing seek operations in a disk drive having a disk surface with spiral servo information written thereon
InactiveUS6985316B1Filamentary/web record carriersRecord information storageStandard intervalSignal envelope
The present invention is directed to a method and apparatus for performing seek operations in a disk drive having a disk surface with spiral servo information written thereon. In one embodiment, a disk surface is provided with a read head associated therewith. The disk surface has spiral servo information written thereon. The read head generates a read signal envelope when reading the spiral servo information. A plurality of integration windows is provided. The plurality of integration windows have a standard interval therebetween. A position error signal is generated based upon a location of a read signal envelope within an integration window. The interval between adjacent integration windows is adjusted from the standard interval to generate a position error signal. The read head is moved in a radial direction based upon the position error signal. This process may be repeated to seek across the disk surface.
Owner:MAXTOR
Integrated transceiver with envelope tracking
InactiveUS20060199553A1Resonant long antennasAmplifier modifications to reduce noise influenceTransceiverEngineering
A transceiver comprises an amplifying circuit for amplifying an input signal to produce an output signal. A power supply is operable for varying the level of power supplied to the amplifying circuit in response to variation of an input signal envelope directed to the power supply. A processing circuit is operable for digitally detecting the input signal envelope to provide variation of the power supply level. The processing circuit is further operable for digitally delaying the digital input signal envelope to time align the power supply level with the input signal.
Owner:ANDREW LLC
Method for offset-modulation orthogonal frequency division multiplexing transmission with cyclic prefix
ActiveCN101795257ALow signal envelope fluctuation performanceReduce complexityMulti-frequency code systemsTransmitter/receiver shaping networksFrequency spectrumFourier transform on finite groups
Owner:HUAWEI TECH CO LTD
Method and apparatus for dynamic placement of an integration window in a disk drive having a disk surface with spiral servo information written thereon
InactiveUS7230786B1Small sizeDriving/moving recording headsRecord information storageSignal envelopePosition error
The present invention is directed to a method and apparatus for dynamic placement of an integration window in a disk drive having a disk surface with spiral servo information written thereon. A read head is provided for reading the spiral servo information and generating a read signal envelope. A repetitive spiral position error, associated with one spiral of the spiral servo information, is measured. Placement of an integration window is dynamically adjusted based upon the measured repetitive spiral position error, so that a read signal envelope read by the read head appears more towards the center of the integration window than if the placement of the integration window was not dynamically adjusted. By adjusting the placement of the integration window, dynamic range is increased without increasing the size of the integration window.
Owner:MAXTOR
Envelope tracking for high power amplifiers
ActiveUS20180138862A1Amplifier modifications to reduce non-linear distortionPower amplifiersSignal-to-noise ratio (imaging)Dc dc converter
Disclosed herein are circuits, devices and methods that address challenges associated with power amplifier systems. A power amplifier system includes two or more fast error amplifiers coupled to corresponding power amplifiers. The fast error amplifiers are configured to generate envelope tracking signals based on a signal envelope, the envelope tracking signals modifying a DC-DC regulated voltage from a DC-DC converter to more efficiently operate the power amplifiers. By splitting the envelope tracking between two or more fast error amplifiers and amplification between corresponding two or more power amplifiers, the power, frequency or bandwidth, linearity, signal-to-noise ratio, efficiency, or the like of the power amplifier system can be improved. Wireless communications configurations with such power amplifier systems can provide uplink carrier aggregation and / or cellular signals based on standards and protocols that require increased bandwidth and / or power.
Owner:SKYWORKS SOLUTIONS INC
Transmitter with an envelope tracking power amplifier utilizing digital predistortion of the signal envelope
InactiveUS20060209984A1Improve efficiencyReduce complexitySecret communicationTransmitter/receiver shaping networksAudio power amplifierSignal envelope
A transmitter comprises an amplifier operable for receiving an input signal and amplifying the input signal to produce an output signal. A power supply is coupled to the amplifier for supplying power to the amplifier, the power supply operable for tracking the input signal and varying the level of power supplied to the amplifier in response to variation of the input signal. A predistortion circuit is coupled to the power supply, the predistortion circuit operable for receiving the input signal and predistorting the input signal to the power supply for addressing input signal tracking capabilities of the power supply.
Owner:ANDREW LLC
Positioning system, device, and method for in-flight refueling
ActiveUS7093801B2Precise positioningImproving safety and efficiencyAircraft componentsWeapon componentsFlight vehicleSignal envelope
A positioning system, device, and method are provided to facilitate the in-flight positioning of two aircraft relative to one another such that a second aircraft is guided to an in-flight refueling position relative to a first aircraft. The system, device, and method of the present invention provide a signal emitted from a positioning device carried by the first aircraft, wherein the signal defines a signal envelope containing the in-flight refueling position. The signal is adapted to be receivable by the second aircraft such that the signal may guide the second aircraft to the in-flight refueling position relative to the first aircraft.
Owner:THE BOEING CO
Envelope Specific Stimulus Timing
An implantable stimulation arrangement is described for generating electrode stimulation signals for an implanted electrode array having stimulation electrodes. A filter bank pre-processor processes an input acoustic audio signal to generate band pass signals each corresponding to an associated band of audio frequencies. A signal envelope module computes a corresponding signal envelope for each band pass signal. A stimulation pulse generator extracts stimulation signal information from the rate of change of the signal envelopes such as a time-based derivative to generate stimulation event signals defining electrode stimulation timings and amplitudes for some or all of the stimulation electrodes.
Owner:MED EL ELEKTROMEDIZINISCHE GERAETE GMBH
On frequency repeater with AGC stability determination
An on frequency repeater for wireless networks with feedback oscillation detection is disclosed. The on frequency repeater includes an automatic gain control loop which samples amplified signal envelope. The automatic gain control loop is monitored and a characteristic saw tooth pattern in the gain control loop indicating feedback oscillation is detected. A nonlinear gain expander circuit may be periodically activated to allow feedback oscillation detection in repeater applications employing linearized amplifiers.
Owner:INTEL CORP
Temporal and spatial shaping of multi-channel audio signals
A selected channel of a multi-channel signal which is represented by frames composed from sampling values having a high time resolution can be encoded with higher quality when a wave form parameter representation representing a wave form of an intermediate resolution representation of the selected channel is derived, the wave form parameter representation including a sequence of intermediate wave form parameters having a time resolution lower than the high time resolution of the sampling values and higher than a time resolution defined by a frame repetition rate. The wave form parameter representation with the intermediate resolution can be used to shape a reconstructed channel to retrieve a channel having a signal envelope close to that one of the selected original channel. The time scale on which the shaping is performed is shorter than the time scale of a framewise processing, thus enhancing the quality of the reconstructed channel. On the other hand, the shaping time scale is larger than the time scale of the sampling values, significantly reducing the amount of data needed by the wave form parameter representation.
Owner:FRAUNHOFER GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG EV +1
Dynamic range improvements of load modulated amplifiers
InactiveUS20110148518A1Improve power efficiencyLow efficiencyHigh frequency amplifiersGain controlAudio power amplifierSignal envelope
The present invention relates to methods and devices to control and operate the functionality of a power amplifier system (100) capable of operating in at least three differential amplification modes. The drive signal's amplitude envelope controls an integrated switch network (104; 105, 106) that routes both the signal envelope and signal phase to different modulation blocks (111, 112: 109, 110: 115). Depending on the envelope strength, the operational mode of the amplifier system is possible to alter to best serve the signal statistics to provide the highest overall power efficiency.
Owner:TELEFON AB LM ERICSSON (PUBL)
Method and apparatus for using navigation signal information for geoencryption to enhance security
ActiveUS20090316900A1Increase entropyError detection/correctionVolume/mass flow measurementComputer hardwareSignal envelope
A data encryption and decryption system securely geoencrypts data using location-dependent navigation signals. To increase the entropy of the cryptographic key to guard against a brute-force attack, geoencryption is made to depend on largely time-independent characteristics of the navigation signals that are not easily spoofed, including the time difference of arrival, the envelope-to-cycle difference, the differential signal-to-noise, the signal envelope shape, and the directions of arrival of the navigation signal set.
Owner:SANDFORD UNIV +1
Systems and methods for key generation in wireless communication systems
A system and a method for providing a secure wireless ad-hoc network in a wireless communication system having at least two transceivers coupled by a wireless transmission link are disclosed. The method includes receiving a data transmission at a first transceiver from a second transceiver, wherein the data transmission identifies a source of a signal in the data transmission and the signal is identified by a signal envelope; detecting a deep fade in the data transmission, wherein the first and second transceivers are configured to sample the source of the signal in the data transmission; determining whether the received signal exceeds a predetermined threshold for deep fades, wherein the predetermined threshold is preset by the first and second transceivers; generating a bit-string corresponding to each of the transceivers based on channel fading information relating to the wireless transmission link; and, using the bit-string, generating a key.
Owner:UNIV OF CONNECTICUT +1
Method for eliminating interference to blood oxygen saturation monitoring
InactiveCN102499694ASuppression of motion interferenceAccurate blood oxygen saturationDiagnostic recording/measuringSensorsAdaptive filtering algorithmTarget signal
A method for eliminating interference to blood oxygen saturation monitoring includes steps of digitally filtering acquired red light and infrared light PPG (photoplethysmography) signals, removing low-frequency interference signals in direct current components, computing accurate direct-current component value, computing PPG signal envelope curves to extract alternating-current components, separating signals relevant with interference and serving the same as reference signals to be subjected to self-adaptive filtering, eliminating movement interference generated from aliasing of frequency and target signals in the alternating-current components, computing to obtain the accurate PPG alternating-current component value, and finally computing the blood oxygen saturation after the interference is eliminated according to the Lambert-Beer's law. The method is capable of suppressing movement interference well and computing to obtain the accurate blood oxygen saturation value. By extracting the reference signals directly from the red light and infrared light PPG signals to realize self-adaptive filtering, the method is simple in construction, simple in algorithm and small in computing number, has no need of an extra device for providing reference signals, is free of multiple self-adaptive filtering, and facilitates miniaturization and portability of monitoring equipment.
Owner:INST OF FIELD OPERATION SURGERY NO 3 MILITARY MEDICL UNIV PLA
Adaptive piezoelectric actuator control system
InactiveUS20090095821A1Reliable detectionReduce liquid viscosityPiezoelectric/electrostriction/magnetostriction machinesWatering devicesElectricityControl system
Adaptive piezoelectric actuator control system, including:a power supply,a piezoelectric actuator,a driver driving the actuator,a signal generator providing a frequency signal to the driver,a user interface allowing user input of operating conditions,memory storing parameters of the actuator, andsystem control means controlling the power supply, driver generator and memory so operating frequency of the actuator is monitored and regulated,wherein the driver comprisestest means providing a test signal to the actuator,voltage measurement means measuring voltage applied to the actuator caused by the test signal and voltage applied to the actuator caused by the frequency signal,the system control means receiving a response signal in response to the test, and receiving voltages measured by the voltage measurement means, and comprising signal analysis means creating a response signal envelope and controlling the generator to generate a frequency signal corresponding to the envelope maximum.
Owner:APTAR FRANCE SAS
Systems and methods for key generation in wireless communication systems
ActiveUS20090225982A1Encryption apparatus with shift registers/memoriesSecret communicationWireless transmissionCommunications system
A system and a method for providing a secure wireless ad-hoc network in a wireless communication system having at least two transceivers coupled by a wireless transmission link are disclosed. The method includes receiving a data transmission at a first transceiver from a second transceiver, wherein the data transmission identifies a source of a signal in the data transmission and the signal is identified by a signal envelope; detecting a deep fade in the data transmission, wherein the first and second transceivers are configured to sample the source of the signal in the data transmission; determining whether the received signal exceeds a predetermined threshold for deep fades, wherein the predetermined threshold is preset by the first and second transceivers; generating a bit-string corresponding to each of the transceivers based on channel fading information relating to the wireless transmission link; and, using the bit-string, generating a key.
Owner:UNIV OF CONNECTICUT +1
Dispersion compensation method for broadband light source
ActiveCN102332956AImprove test accuracyHigh precisionElectromagnetic transmissionFrequency spectrumMichelson interferometer
The invention discloses a dispersion compensation method for a broadband light source. A polarization-preserving fiber polarization coupling testing system based on a Michelson interferometer is formed by the broadband light source, and the Michelson interferometer compensates the optical path difference between an excitation mode and a coupling mode in the polarization-preserving fiber, and a detector acquires an interference signal; specifically, the method comprises the following steps of: intercepting the initial data acquired by the detector through a window function, and taking out the interference data Imain between the excitation modes and the interference data Icoupling between the excitation mode and the coupling mode; respectively executing Hilbert transformation and Gaussian fitting on the Imain and the Icoupling, obtaining envelopes (I)main and (I)coupling of the interference signal, getting a birefringence dispersion coefficient Delta D according to a ratio Eta of the width of the (I)main to the width of the (I)coupling at a 1 / e part, obtaining a phase factor needed for the dispersion compensation, and then multiplying the phase factor by a nonlinear frequency spectrum function with dispersion information to eliminate nonlinear phase items causing the widening of the interference signal envelopes; and finally, obtaining the dispersion compensated interference signal Icomp by executing Fourier inversion on the obtained linear frequency spectrum function.
Owner:TIANJIN UNIV
Method and apparatus for providing multi-point position demodulation of a read head when using spiral-written servo information
InactiveUS7136253B1Reduce noiseDriving/moving recording headsRecord information storageIntegratorSignal envelope
The present invention is directed to a method and apparatus for providing multi-point position demodulation of a read head when using spiral-written servo information. In one embodiment, a disk surface has spiral servo information written thereon. A read head generates a read signal envelope when reading the spiral servo information. A read signal envelope is detected within an integration window and integration values are accumulated over the integration window. The accumulated integration values are multiplied by a first number associated with a first integrator value and a second number associated with a second integrator value. A first position error signal associated with the first integrator value is determined, and a second position error signal associated with the second integrator value is also determined. A final position error signal is determined using the first position error signal and the second position error signal.
Owner:MAXTOR
Method for binary coding of quantization indices of a signal envelope, method for decoding a signal envelope and corresponding coding and decoding modules
The invention concerns a module (402) for binary coding of a signal envelope, comprising a coding module (502) of a first variable length mode. According to the invention, the coding module of a first mode incorporates an envelope saturation detector and said coding module (402) also comprises a second coding module (503) of a second mode, arranged parallel to the coding module (502) of the first mode, and a mode selector (504) capable of maintaining one of the two coding modes, based on a code length criterion and on the result derived from the envelope saturation detector. The invention is applicable to coding by audiofrequency signal transform.
Owner:FRANCE TELECOM SA
Acquiring spiral servo information on a storage surface
InactiveUS7382564B1Driving/moving recording headsRecord information storageComputer hardwareSignal envelope
Various embodiments of the present invention are generally directed to processing servo data on a storage surface by detecting a time difference between consecutive read signal envelopes from spiral servo information on the surface.
Owner:MAXTOR
Transmitter with an envelope tracking power amplifier utilizing digital predistortion of the signal envelope
InactiveUS7706467B2Improve efficiencyReduce complexitySecret communicationTransmitter/receiver shaping networksAudio power amplifierSignal envelope
A transmitter comprises an amplifier operable for receiving an input signal and amplifying the input signal to produce an output signal. A power supply is coupled to the amplifier for supplying power to the amplifier, the power supply operable for tracking the input signal and varying the level of power supplied to the amplifier in response to variation of the input signal. A predistortion circuit is coupled to the power supply, the predistortion circuit operable for receiving the input signal and predistorting the input signal to the power supply for addressing input signal tracking capabilities of the power supply.
Owner:ANDREW LLC
Low-altitude target detection method based on multi-frequency point echo amplitude reversed order statistics
InactiveCN102944873AImprove signal to noise ratioMiscellaneous ratio reductionWave based measurement systemsReverse orderSignal envelope
The invention discloses a low-altitude target detection method based on multi-frequency point echo amplitude reversed order statistics. The low-altitude target detection method based on the multi-frequency point echo amplitude reversed order statistics mainly solves the problem that low-altitude target detection performance in the prior art is poor in multi-path environment. The low-altitude target detection method includes: 1) performing matched filtering and linear detection on multi-frequency point echo signals received by a radar, and outputting signal envelope; 2) selecting detection units and reference units from the signal envelope; 3) performing reversed order arrangement on the detection units to obtain a group of reversed order data; 4) evaluating reflection coefficient, and calculating an optimal K value; 5) utilizing the optimal K value and the reversed order data to calculate detection amount of the echo signals; 6) utilizing reference unit data to evaluate clutter amplitude through a unit average method; 7) calculating a detection threshold coefficient; 8) utilizing the clutter amplitude and the threshold coefficient to obtain a detection threshold of the echo signals; and 9) comparing the detection value to the detection threshold, and judging whether a target exist. The low-altitude target detection method based on the multi-frequency point echo amplitude reversed order statistics is high in detection performance at low signal-to-clutter ratio and improves radar detection capacity of the low-altitude target.
Owner:XIDIAN UNIV
Features
- R&D
- Intellectual Property
- Life Sciences
- Materials
- Tech Scout
Why Patsnap Eureka
- Unparalleled Data Quality
- Higher Quality Content
- 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.
© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com