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1. 发明授权

US11418152B2 Biasing circuits for voltage controlled or output circuits 有权
公开(公告)号：US11418152B2
公开(公告)日：2022-08-16
申请号：US17112474
申请日：2020-12-04
申请人： Ronald Quan
发明人： Ronald Quan
IPC分类号： H03F1/32 , H03F1/02
摘要： A number of biasing circuits for amplifiers including voltage controlled amplifier is presented. Also a number of field effect transistor circuits include voltage controlled attenuators or voltage controlled processing circuits. Example circuits include modulators, lower distortion variable voltage controlled resistors, sine wave to triangle wave converters, and or servo controlled biasing circuits.

2. 发明申请

US20210344316A1 Field Effect Transistor Circuits 有权
公开(公告)号：US20210344316A1
公开(公告)日：2021-11-04
申请号：US16866399
申请日：2020-05-04
申请人： Ronald Quan
发明人： Ronald Quan
IPC分类号： H03G1/00 , H03G3/30
摘要： A number of field effect transistor circuits include voltage controlled attenuators or voltage controlled processing circuits. Example circuits include modulators, lower distortion variable voltage controlled resistors, sine wave to triangle wave converters, and or servo controlled biasing circuits.

3. 发明授权

US11041893B2 Method and apparatus to evaluate audio equipment for dynamic distortions and or differential phase and or frequency modulation effects 有权
公开(公告)号：US11041893B2
公开(公告)日：2021-06-22
申请号：US16572220
申请日：2019-09-16
申请人： Ronald Quan
发明人： Ronald Quan
IPC分类号： G01R23/20 , G01R23/18 , H03K19/003 , H03K17/16 , H03F1/26 , G01R31/28
摘要： 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.

4. 发明申请

US20210083640A1 METHOD AND APPARATUS TO EVALUATE AUDIO EQUIPMENT FOR DYNAMIC DISTORTIONS AND OR DIFFERENTIAL PHASE AND OR FREQUENCY MODULATION EFFECTS 有权
公开(公告)号：US20210083640A1
公开(公告)日：2021-03-18
申请号：US17099088
申请日：2020-11-16
申请人： Ronald Quan
发明人： Ronald Quan
IPC分类号： H03G11/08 , H03G3/30 , H04R29/00
摘要： 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.

5. 发明授权

US10868507B2 Biasing circuits for voltage controlled or output circuits 有权
公开(公告)号：US10868507B2
公开(公告)日：2020-12-15
申请号：US16208446
申请日：2018-12-03
申请人： Ronald Quan
发明人： Ronald Quan
IPC分类号： H03G1/00 , H03F3/45 , H03F1/02 , H03G3/30
CPC分类号： H03G1/007 , H03F1/0211 , H03F3/45174 , H03F3/45273 , H03G3/30 , H03F2203/45154
摘要： A number of biasing circuits for amplifiers including voltage controlled amplifier is presented. Also a number of field effect transistor circuits include voltage controlled attenuators or voltage controlled processing circuits. Example circuits include modulators, lower distortion variable voltage controlled resistors, sine wave to triangle wave converters, and or servo controlled biasing circuits.

6. 发明授权

US10651810B1 Field effect transistor circuits 有权
公开(公告)号：US10651810B1
公开(公告)日：2020-05-12
申请号：US16513376
申请日：2019-07-16
申请人： Ronald Quan
发明人： Ronald Quan
IPC分类号： H03K3/33 , H03K17/16 , H03K19/00 , H01L27/088 , H03K17/042 , H03G1/00 , H03G3/30 , H03K4/06 , H01L29/808 , H01P1/22
摘要： A number of field effect transistor circuits include voltage controlled attenuators or voltage controlled processing circuits. Example circuits include modulators, lower distortion variable voltage controlled resistors, sine wave to triangle wave converters, and or servo controlled biasing circuits.

7. 发明授权

US10067177B2 Method and apparatus to evaluate audio equipment via filter banks for dynamic distortions and or differential phase and frequency modulation effects 有权
公开(公告)号：US10067177B2
公开(公告)日：2018-09-04
申请号：US15151440
申请日：2016-05-10
申请人： Ronald Quan
发明人： Ronald Quan
IPC分类号： G01R31/28 , H04R29/00 , G01R23/20
摘要： 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.

8. 发明申请

US20170118569A1 METHOD AND APPARATUS TO EVALUATE AUDIO EQUIPMENT FOR DYNAMIC DISTORTIONS AND OR DIFFERENTIAL PHASE AND OR FREQUENCY MODULATION EFFECTS 审中-公开
公开(公告)号：US20170118569A1
公开(公告)日：2017-04-27
申请号：US15397767
申请日：2017-01-04
申请人： Ronald Quan
发明人： Ronald Quan
IPC分类号： H04R29/00
CPC分类号： H04R29/001 , H04R29/004 , H04R29/008 , H04R2430/03
摘要： 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.

9. 发明授权

US08643359B2 Method and apparatus to measure differential phase and frequency modulation distortions for audio equipment 有权
标题翻译：用于测量音频设备的差分相位和频率调制失真的方法和装置
公开(公告)号：US08643359B2
公开(公告)日：2014-02-04
申请号：US12456752
申请日：2009-06-22
申请人： Ronald Quan
发明人： Ronald Quan
IPC分类号： G01R23/16
CPC分类号： G01R23/20 , G01R27/28 , G01R31/2825 , G10L25/69
摘要： 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.
摘要翻译：测试方法或装置利用施加到被测器件的多个频率来测量新发现的频率调制效应。一个实施例可以包括具有较小振幅较高频率信号的较低频率信号，以测试频率响应，增益和/或相位的动态变化。这种动态测试可以显示频率调制效应。另一实施例可以包括使用多频率信号来动态地诱导具有差分相位失真的装置的时变相位或频率失真。然后使用FM检测器测量设备的输出，以测量测试信号中使用的一个频率的偏移量，或者测量来自设备的任何信号（包括失真产物）的调频效果。本发明的另一个实施例可以包括在测量各种工作点处的谐波或互调失真或相位或频率响应的同时偏置具有跨越器件的输出电压范围的电压的器件。

10. 发明申请

US20130058629A1 METHOD AND APPARATUS FOR REDUCING AND RESTORING THE EFFECTIVENESS OF A COMMERCIAL SKIP SYSTEM 有权
公开(公告)号：US20130058629A1
公开(公告)日：2013-03-07
申请号：US13584569
申请日：2012-08-13
申请人： Ronald Quan , John O. Ryan , Peter Wonfor
发明人： Ronald Quan , John O. Ryan , Peter Wonfor
IPC分类号： H04N9/80
CPC分类号： H04N21/812 , H04H60/375 , H04H60/58 , H04H60/59 , H04N5/76 , H04N21/233 , H04N21/234 , H04N21/4334
摘要： A method and apparatus is disclosed which reduces or removes the effectiveness of commercial skip systems such as presently found in VCRs, PVRs, etc. which are designed to delete commercials from signal material upon playback of a previously recorded version of the signal material. In an embodiment, the effectiveness of the commercial skip system is reduced or removed by adding a flat field of selected signal level to active line portions of video lines of the signal material. Other embodiments modify the normal fade to black signal indicative of a commercial to provide a fade to non-black signal. In further embodiments, a fade to non-black signal is inserted in an overscan area of the signal picture. Still further embodiments modify audio signals or selected signals in the horizontal blanking interval which may be used in commercial skip systems to detect the presence of commercials.

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