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42results about How to "Reduce and or frequency modulation" patented technology
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Method and apparatus to measure differential phase and frequency modulation distortions for audio equipment
ActiveUS20100141269A1Reduce and or frequency modulationSpectral/fourier analysisResistance/reactance/impedenceSmall amplitudeOperating point
A testing method or apparatus utilizes multiple frequencies applied to a device under test for measuring newly discovered frequency modulation effects. An embodiment may include a lower frequency signal with a smaller amplitude higher frequency signal to test a dynamic change in frequency response, gain, and or phase. This dynamic test can reveal frequency modulation effects. Another embodiment may include the use of a multiple frequency signal to dynamically induce a time varying phase or frequency distortion for the device that has differential phase distortion. The device's output is then measured with an FM detector or spectrum analysis system to measure a shift in one of the frequencies used in the test signal or to measure frequency modulation effects of any signals, including distortion products, from the device. Yet another embodiment of the invention may include biasing a device with a voltage to span the output voltage range of the device while measuring harmonic or intermodulation distortion or phase or frequency response at the various operating points.
Owner:QUAN RONALD
Method and apparatus to evaluate audio equipment via filter banks
ActiveUS20140355774A1Reduce and or frequency modulationSignal processingAudio power amplifierHarmonic
A testing method or apparatus utilizes filter banks to measure time varying or dynamic harmonic distortion or intermodulation distortion. With a stairstep signal and filter banks, Nth order harmonic and or intermodulation distortion is measured via the filter banks at different offsets provided by an arbitrary low frequency signal. An amplifier with crossover distortion will show increased harmonic and or intermodulation distortion near the zero crossing while providing less distortion in other portions of the transfer curve of the amplifier.
Owner:QUAN RONALD
Method and apparatus to evaluate audio equipment for dynamic distortions and or differential phase and or frequency modulation effects
ActiveUS20170118569A1Reduce and or frequency modulationSignal processingDifferential phaseFrequency modulation
A system is provided to analyze cross-modulation distortion in audio devices, which may include testing with audio frequencies. One or more distortion signals from the audio device may be measured for an amplitude, phase, and or frequency modulation effect. In another embodiment a musical signal may be used as a test signal. Providing additional test signals to the audio device can induce a time varying cross-modulation distortion signal from an output of the audio device.
Owner:QUAN RONALD
Method and apparatus to measure differntial phase and frequency modulation distortions for audio equipment
ActiveUS20130188795A1Reduce and or frequency modulationSpectral/fourier analysisElectrical apparatusFundamental frequencyFrequency modulation
A testing method or apparatus utilizes multiple frequencies applied to a device under test for measuring newly discovered frequency modulation effects. An embodiment may include a lower frequency signal combined with two (or more) higher frequency signals to test a dynamic change in frequency response, gain, and or phase of the lower frequency signal from an audio device. This dynamic test can reveal frequency modulation effects via the two higher frequency signals emulate a modulated signal that provides a phase or frequency modulation frequency related to the difference of the two higher frequency signals. Another embodiment may include the use of a higher frequency signal and pulsed waveform to dynamically induce a time varying phase or frequency distortion of the pulsed waveform or components of the pulsed waveform from the device that has differential phase distortion. In another embodiment, the device's output is then measured with an FM detector and or phase detector to measure a phase and or frequency shift in one or more signals of the frequencies related to the pulsed waveform, such as a signal of the fundamental frequency and or one or more harmonic related to the pulsed waveform the device.
Owner:QUAN RONALD
Method and apparatus to measure differential phase and frequency modulation distortions for audio equipment
ActiveUS20070069739A1Reduce and or frequency modulationSpectral/fourier analysisResistance/reactance/impedenceSmall amplitudeOperating point
A testing method or apparatus utilizes multiple frequencies applied to a device under test for measuring newly discovered frequency modulation effects. An embodiment may include a lower frequency signal with a smaller amplitude higher frequency signal to test a dynamic change in frequency response, gain, and or phase. This dynamic test can reveal frequency modulation effects. Another embodiment may include the use of a multiple frequency signal to dynamically induce a time varying phase or frequency distortion for the device that has differential phase distortion. The device's output is then measured with an FM detector to measure a shift in one of the frequencies used in the test signal or to measure frequency modulation effects of any signals, including distortion products, from the device. Yet another embodiment of the invention may include biasing a device with a voltage to span the output voltage range of the device while measuring harmonic or intermodulation distortion or phase or frequency response at the various operating points.
Owner:QUAN RONALD
Method and apparatus to measure differential phase and frequency modulation distortions for audio equipment
ActiveUS7550977B2Reduce and or frequency modulationSpectral/fourier analysisResistance/reactance/impedenceSmall amplitudeMeasurement test
Owner:QUAN RONALD
Method and apparatus to evaluate audio equipment via filter banks for dynamic distortions and or differential phase and frequency modulation effects
ActiveUS20140254812A1Reduce and or frequency modulationSpectral/fourier analysisElectrical apparatusFrequency modulationCrossover distortion
A testing method or apparatus utilizes filter banks to measure time varying or dynamic harmonic distortion or intermodulation distortion from a device. With a stairstep or arbitrary signal and filter banks, Nth order harmonic and or intermodulation distortion is measured via the filter banks at different offsets provided by an arbitrary low frequency signal. An amplifier with crossover distortion will show increased harmonic and or intermodulation distortion near the zero crossing while providing less distortion in other portions of the transfer curve of the amplifier. One or more distortion signals from the device (e.g., audio device) may be measured for a phase and or frequency modulation effect.
Owner:QUAN RONALD
Method and apparatus to evaluate audio equipment for dynamic distortions and or differential phase and or frequency modulation effects
ActiveUS20180332415A1Reduce and or frequency modulationFrequency response correctionPhase responseDifferential phase
A system is provided to analyze cross-modulation distortion in audio devices, which may include testing with audio frequencies. One or more distortion signals from the audio device may be measured for an amplitude, phase, and or frequency modulation effect. In another embodiment a musical signal may be used as a test signal. Providing additional test signals to the audio device can induce a time varying cross-modulation distortion signal from an output of the audio device. Also utilizing at least one additional filter, filter bank, demodulator and or frequency converter and or frequency multiplier provides extra examination of distortion. Also frequency and or phase response can be measured with the presence of a de-sensing signal and or another signal that induce near slew rate limiting or near overload condition of the device under test.
Owner:QUAN RONALD
Method and apparatus to measure differential phase and frequency modulation distortions for audio equipment
ActiveUS20110002472A1Reduce and or frequency modulationSpectral/fourier analysisElectrical apparatusSmall amplitudeMeasurement test
A testing method or apparatus utilizes multiple frequencies applied to a device under test for measuring newly discovered frequency modulation effects. An embodiment may include a lower frequency signal with a smaller amplitude higher frequency signal to test a dynamic change in frequency response, gain, and or phase. This dynamic test can reveal frequency modulation effects. Another embodiment may include the use of a multiple frequency signal or a modulated signal such as an amplitude modulated to dynamically induce a time varying phase or frequency distortion for the device that has differential phase distortion. In another embodiment, the device's output is then measured with an FM detector, Wow and / or Flutter meter, phase detector, and or spectrum analysis system to measure a shift in one of the frequencies used in the test signal or to measure phase and or frequency modulation effects of any signals such as a distortion product, a carrier signal, and or a distortion product of the carrier signal from the device.
Owner:QUAN RONALD
Method and apparatus to evaluate audio equipment for dynamic distortions and or differential phase and or frequency modulation effects
ActiveUS20180024175A1Reduce and or frequency modulationSpectral/fourier analysisSignal processingDifferential phaseFrequency multiplier
A system is provided to analyze cross-modulation distortion in audio devices, which may include testing with audio frequencies. One or more distortion signals from the audio device may be measured for an amplitude, phase, and or frequency modulation effect. In another embodiment a musical signal may be used as a test signal. Providing additional test signals to the audio device can induce a time varying cross-modulation distortion signal from an output of the audio device. Also utilizing at least one additional filter, filter bank, demodulator and or frequency converter and or frequency multiplier provides extra examination of distortion.
Owner:QUAN RONALD
Method and apparatus to measure differential phase and frequency modulation distortions for audio equipment
ActiveUS20090261808A1Reduce and or frequency modulationSpectral/fourier analysisResistance/reactance/impedenceSmall amplitudeOperating point
A testing method or apparatus utilizes multiple frequencies applied to a device under test for measuring newly discovered frequency modulation effects. An embodiment may include a lower frequency signal with a smaller amplitude higher frequency signal to test a dynamic change in frequency response, gain, and or phase. This dynamic test can reveal frequency modulation effects. Another embodiment may include the use of a multiple frequency signal to dynamically induce a time varying phase or frequency distortion for the device that has differential phase distortion. The device's output is then measured with an FM detector to measure a shift in one of the frequencies used in the test signal or to measure frequency modulation effects of any signals, including distortion products, from the device. Yet another embodiment of the invention may include biasing a device with a voltage to span the output voltage range of the device while measuring harmonic or intermodulation distortion or phase or frequency response at the various operating points.
Owner:QUAN RONALD
Method and apparatus to evaluate audio equipment for dynamic distortions and or differential phase and or frequency modulation effects
ActiveUS20200153406A1Reduce and or frequency modulationSpectral/fourier analysisSignal processingDistortionFrequency multiplier
A system is provided to analyze cross-modulation distortion in audio devices, which may include testing with audio frequencies. One or more distortion signals from the audio device may be measured for an amplitude, phase, and or frequency modulation effect. In another embodiment a musical signal may be used as a test signal. Providing additional test signals to the audio device can induce a time varying cross-modulation distortion signal from an output of the audio device. Also utilizing at least one additional filter, filter bank, demodulator and or frequency converter and or frequency multiplier provides extra examination of distortion. Also frequency and or phase response can be measured with the presence of a de-sensing signal and or another signal that induce near slew rate limiting or near overload condition of the device under test. Another system is provided to analyze modulation index differences between input and output signals for a test signal including modulation.
Owner:QUAN RONALD
Method and apparatus to measure differential phase and frequency modulation distortions for audio equipment
ActiveUS8704533B2Reduce and or frequency modulationSpectral/fourier analysisElectrical apparatusSmall amplitudeOperating point
A testing method or apparatus utilizes multiple frequencies applied to a device under test for measuring newly discovered frequency modulation effects. An embodiment may include a lower frequency signal with a smaller amplitude higher frequency signal to test a dynamic change in frequency response, gain, and or phase. This dynamic test can reveal frequency modulation effects. Another embodiment may include the use of a multiple frequency signal to dynamically induce a time varying phase or frequency distortion for the device that has differential phase distortion. The device's output is then measured with an FM detector or spectrum analysis system to measure a shift in one of the frequencies used in the test signal or to measure frequency modulation effects of any signals, including distortion products, from the device. Yet another embodiment of the invention may include biasing a device with a voltage to span the output voltage range of the device while measuring harmonic or intermodulation distortion or phase or frequency response at the various operating points.
Owner:QUAN RONALD
Method and apparatus to evaluate audio equipment for dynamic distortions and or differential phase and or frequency modulation effects
ActiveUS20200011912A1Reduce and or frequency modulationSpectral/fourier analysisAmplifier modifications to reduce noise influenceDistortionFrequency multiplier
A system is provided to analyze cross-modulation distortion in audio devices, which may include testing with audio frequencies. One or more distortion signals from the audio device may be measured for an amplitude, phase, and or frequency modulation effect. In another embodiment a musical signal may be used as a test signal. Providing additional test signals to the audio device can induce a time varying cross-modulation distortion signal from an output of the audio device. Also utilizing at least one additional filter, filter bank, demodulator and or frequency converter and or frequency multiplier provides extra examination of distortion. Also frequency and or phase response can be measured with the presence of a de-sensing signal and or another signal that induce near slew rate limiting or near overload condition of the device under test.
Owner:QUAN RONALD
Method and apparatus to evaluate audio equipment for dynamic distortions and or differential phase and or frequency modulation effects
ActiveUS20180288548A1Reduce and or frequency modulationElectrical apparatusDifferential phaseFrequency multiplier
A system is provided to analyze cross-modulation distortion in audio devices, which may include testing with audio frequencies. One or more distortion signals from the audio device may be measured for an amplitude, phase, and or frequency modulation effect. In another embodiment a musical signal may be used as a test signal. Providing additional test signals to the audio device can induce a time varying cross-modulation distortion signal from an output of the audio device. Also utilizing at least one additional filter, filter bank, demodulator and or frequency converter and or frequency multiplier provides extra examination of distortion.
Owner:QUAN RONALD
Method and apparatus to measure differential phase and frequency modulation distortions for audio equipment
ActiveUS20090252342A1Reduce and or frequency modulationSpectral/fourier analysisResistance/reactance/impedenceSmall amplitudeOperating point
A testing method or apparatus utilizes multiple frequencies applied to a device under test for measuring newly discovered frequency modulation effects. An embodiment may include a lower frequency signal with a smaller amplitude higher frequency signal to test a dynamic change in frequency response, gain, and or phase. This dynamic test can reveal frequency modulation effects. Another embodiment may include the use of a multiple frequency signal to dynamically induce a time varying phase or frequency distortion for the device that has differential phase distortion. The device's output is then measured with an FM detector to measure a shift in one of the frequencies used in the test signal or to measure frequency modulation effects of any signals, including distortion products, from the device. Yet another embodiment of the invention may include biasing a device with a voltage to span the output voltage range of the device while measuring harmonic or intermodulation distortion or phase or frequency response at the various operating points.
Owner:QUAN RONALD
Method and apparatus to evaluate audio equipment via at least one filter for dynamic distortions and or differential phase and or frequency modulation effects
ActiveUS20170328939A1High frequencyImprove FM effectSpectral/fourier analysisSignal processingAudio power amplifierDifferential phase
A testing method or apparatus utilizes a filter or modifier to measure time varying or dynamic harmonic, intermodulation, cross modulation, and or N-Beat or triple distortion from a device. With a stairstep or arbitrary signal and another signal, Nth order harmonic, cross modulation, triple beat, N-Beat, and or intermodulation distortion is measured via the filter or modifier at different offsets or time provided by an arbitrary low frequency signal. For example, an amplifier with crossover distortion will show increased (e.g., time varying) harmonic, cross modulation, triple beat, and or intermodulation distortion near the zero crossing while providing less distortion in other portions of the transfer curve of the amplifier. One or more distortion signals from the device (e.g., audio device) may be measured for a phase and or frequency modulation effect.
Owner:QUAN RONALD
Method and apparatus to evaluate audio equipment via filter banks for dynamic distortions and or differential phase and frequency modulation effects
ActiveUS20160252567A1Reduce and or frequency modulationSpectral/fourier analysisElectrical apparatusCrossover distortionFrequency modulation
Owner:QUAN RONALD
Method and apparatus to evaluate audio equipment for dynamic distortions and or differential phase and or frequency modulation effects
ActiveUS20190037310A1Reduce and or frequency modulationSpeech analysisFrequency response correctionPhase responseFrequency multiplier
A system is provided to analyze cross-modulation distortion in audio devices, which may include testing with audio frequencies. One or more distortion signals from the audio device may be measured for an amplitude, phase, and or frequency modulation effect. In another embodiment a musical signal may be used as a test signal. Providing additional test signals to the audio device can induce a time varying cross-modulation distortion signal from an output of the audio device. Also utilizing at least one additional filter, filter bank, demodulator and or frequency converter and or frequency multiplier provides extra examination of distortion. Also frequency and or phase response can be measured with the presence of a de-sensing signal and or another signal that induce near slew rate limiting or near overload condition of the device under test.
Owner:QUAN RONALD
Method and apparatus to evaluate audio equipment for dynamic distortions and or differential phase and or frequency modulation effects
ActiveUS20210083640A1Reduce and or frequency modulationSignal processingGain controlDistortionFrequency multiplier
A system is provided to analyze frequency (or phase) modulation distortion in an audio device, which may include testing with audio frequencies. In one embodiment a change in pitch (or frequency) is measured at an output of the audio device. One or more distortion signals from the audio device may be measured for an amplitude, phase, and or frequency modulation effect. In another embodiment a musical signal may be used as a test signal. Providing additional test signals to the audio device can induce a time varying cross-modulation distortion signal (or static cross-modulation distortion signal) from an output of the audio device. Also utilizing at least one additional filter, filter bank, demodulator and or frequency converter and or frequency multiplier provides extra examination of distortion. Also frequency and or phase response can be measured with the presence of a de-sensing signal and or another signal that induce near slew rate limiting or near overload condition of the device under test. Another system is provided to analyze modulation index differences between input and output signals for a test signal including modulation.
Owner:QUAN RONALD
Method and apparatus to evaluate audio equipment for dynamic distortions and or differential phase and or frequency modulation effects
ActiveUS9820065B2Reduce and or frequency modulationSignal processingDifferential phaseFrequency modulation
A system is provided to analyze cross-modulation distortion in audio devices, which may include testing with audio frequencies. One or more distortion signals from the audio device may be measured for an amplitude, phase, and or frequency modulation effect. In another embodiment a musical signal may be used as a test signal. Providing additional test signals to the audio device can induce a time varying cross-modulation distortion signal from an output of the audio device.
Owner:QUAN RONALD
Method and apparatus to evaluate audio equipment for dynamic distortions and or differential phase and or frequency modulation effects
ActiveUS20190342682A1Reduce and or frequency modulationSpectral/fourier analysisSignal processingConvertersPhase response
A system is provided to analyze cross-modulation distortion in audio devices, which may include testing with audio frequencies. One or more distortion signals from the audio device may be measured for an amplitude, phase, and or frequency modulation effect. In another embodiment a musical signal may be used as a test signal. Providing additional test signals to the audio device can induce a time varying cross-modulation distortion signal from an output of the audio device. Also utilizing at least one additional filter, filter bank, demodulator and or frequency converter and or frequency multiplier provides extra examination of distortion. Also frequency and or phase response can be measured with the presence of a de-sensing signal and or another signal that induce near slew rate limiting or near overload condition of the device under test.
Owner:QUAN RONALD
Method and apparatus to evaluate audio equipment via filter banks for dynamic distortions and or differential phase and frequency modulation effects
ActiveUS9386385B2Reduce and or frequency modulationSpectral/fourier analysisElectrical apparatusFrequency modulationCrossover distortion
Owner:QUAN RONALD
Method and apparatus to evaluate audio equipment via filter banks
ActiveUS9271097B2Reduce and or frequency modulationSpectral/fourier analysisSignal processingAudio power amplifierHarmonic
A testing method or apparatus utilizes filter banks to measure time varying or dynamic harmonic distortion or intermodulation distortion. With a stairstep signal and filter banks, Nth order harmonic and or intermodulation distortion is measured via the filter banks at different offsets provided by an arbitrary low frequency signal. An amplifier with crossover distortion will show increased harmonic and or intermodulation distortion near the zero crossing while providing less distortion in other portions of the transfer curve of the amplifier.
Owner:QUAN RONALD
Method and apparatus to evaluate audio equipment for dynamic distortions and or differential phase and or frequency modulation effects
ActiveUS20210314716A1Reduce and or frequency modulationElectrical apparatusPhase responseDifferential phase
A system is provided to analyze cross-modulation distortion in audio devices, which may include testing with audio frequencies. One or more distortion signals from the audio device may be measured for an amplitude, phase, and or frequency modulation effect. In another embodiment a musical signal may be used as a test signal. Providing additional test signals to the audio device can induce a time varying cross-modulation distortion signal from an output of the audio device. Also utilizing at least one additional filter, filter bank, demodulator and or frequency converter and or frequency multiplier provides extra examination of distortion. Also frequency and or phase response can be measured with the presence of a de-sensing signal and or another signal that induce near slew rate limiting or near overload condition of the device under test.
Owner:QUAN RONALD
Method and apparatus to evaluate audio equipment for dynamic distortions and or differential phase and or frequency modulation effects
ActiveUS10879864B2Reduce and or frequency modulationSpectral/fourier analysisSignal processingPhase responseDifferential phase
A system is provided to analyze cross-modulation distortion in audio devices, which may include testing with audio frequencies. One or more distortion signals from the audio device may be measured for an amplitude, phase, and or frequency modulation effect. In another embodiment a musical signal may be used as a test signal. Providing additional test signals to the audio device can induce a time varying cross-modulation distortion signal from an output of the audio device. Also utilizing at least one additional filter, filter bank, demodulator and or frequency converter and or frequency multiplier provides extra examination of distortion. Also frequency and or phase response can be measured with the presence of a de-sensing signal and or another signal that induce near slew rate limiting or near overload condition of the device under test. Another system is provided to analyze modulation index differences between input and output signals for a test signal including modulation.
Owner:QUAN RONALD
Method and apparatus to evaluate audio equipment for dynamic distortions and or differential phase and or frequency modulation effects
ActiveUS11041893B2Reduce and or frequency modulationSpectral/fourier analysisAmplifier modifications to reduce noise influenceConvertersPhase response
A system is provided to analyze cross-modulation distortion in audio devices, which may include testing with audio frequencies. One or more distortion signals from the audio device may be measured for an amplitude, phase, and or frequency modulation effect. In another embodiment a musical signal may be used as a test signal. Providing additional test signals to the audio device can induce a time varying cross-modulation distortion signal from an output of the audio device. Also utilizing at least one additional filter, filter bank, demodulator and or frequency converter and or frequency multiplier provides extra examination of distortion. Also frequency and or phase response can be measured with the presence of a de-sensing signal and or another signal that induce near slew rate limiting or near overload condition of the device under test.
Owner:QUAN RONALD
Method and apparatus to evaluate audio equipment for dynamic distortions and or differential phase and or frequency modulation effects
ActiveUS20190229694A1Reduce and or frequency modulationSignal processingGain controlPhase responseDifferential phase
A system is provided to analyze cross-modulation distortion in audio devices, which may include testing with audio frequencies. One or more distortion signals from the audio device may be measured for an amplitude, phase, and or frequency modulation effect. In another embodiment a musical signal may be used as a test signal. Providing additional test signals to the audio device can induce a time varying cross-modulation distortion signal from an output of the audio device. Also utilizing at least one additional filter, filter bank, demodulator and or frequency converter and or frequency multiplier provides extra examination of distortion. Also frequency and or phase response can be measured with the presence of a de-sensing signal and or another signal that induce near slew rate limiting or near overload condition of the device under test.
Owner:QUAN RONALD
Method and apparatus to evaluate audio equipment for dynamic distortions and or differential phase and or frequency modulation effects
ActiveUS10158957B2Reduce and or frequency modulationElectrical apparatusDifferential phaseFrequency multiplier
A system is provided to analyze cross-modulation distortion in audio devices, which may include testing with audio frequencies. One or more distortion signals from the audio device may be measured for an amplitude, phase, and or frequency modulation effect. In another embodiment a musical signal may be used as a test signal. Providing additional test signals to the audio device can induce a time varying cross-modulation distortion signal from an output of the audio device. Also utilizing at least one additional filter, filter bank, demodulator and or frequency converter and or frequency multiplier provides extra examination of distortion.
Owner:QUAN RONALD
Method and apparatus to measure differential phase and frequency modulation distortions for audio equipment
ActiveUS8624602B2Reduce and or frequency modulationSpectral/fourier analysisElectrical apparatusSmall amplitudeCarrier signal
A testing method or apparatus utilizes multiple frequencies applied to a device under test for measuring newly discovered frequency modulation effects. An embodiment may include a lower frequency signal with a smaller amplitude higher frequency signal to test a dynamic change in frequency response, gain, and or phase. This dynamic test can reveal frequency modulation effects. Another embodiment may include the use of a multiple frequency signal or a modulated signal such as an amplitude modulated to dynamically induce a time varying phase or frequency distortion for the device that has differential phase distortion. In another embodiment, the device's output is then measured with an FM detector, Wow and / or Flutter meter, phase detector, and or spectrum analysis system to measure a shift in one of the frequencies used in the test signal or to measure phase and or frequency modulation effects of any signals such as a distortion product, a carrier signal, and or a distortion product of the carrier signal from the device.
Owner:QUAN RONALD
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