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公开(公告)号：US10726873B2
公开(公告)日：2020-07-28
申请号：US16103288
申请日：2018-08-14
Inventor： Ku He , Tejasvi Das , Xin Zhao , Xiaofan Fei
IPC: G11B27/034 , G11B27/19
Abstract: A polymorphic playback system is disclosed in which one or more parameters of a signal path of the polymorphic playback system are varied based on one or more characteristics of a playback signal processed by the signal path, wherein the polymorphic playback system may include a lower-latency detection filter, a higher-latency detection filter, and a control subsystem that uses the lower-latency detection filter for detecting the one or more first characteristics of the playback signal and uses the higher-latency detection filter for detecting the one or more second characteristics of the playback signal.
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公开(公告)号：US10701486B1
公开(公告)日：2020-06-30
申请号：US16522439
申请日：2019-07-25
Inventor： John L. Melanson , Xiaofan Fei , Lei Zhu , Xin Zhao , Wei-Shun Shum , Leyi Yin , Ku He , Johann G. Gaboriau
IPC: H04R3/04
Abstract: A system may include a filter configured to receive a digital audio input signal quantized at between two and 257 quantization levels and sampled at at least 500 kilohertz, the filter further configured to perform filtering on the digital audio input signal to generate a filtered digital audio input signal, the filter having a selectable variable group delay, a digital-to-analog converter configured to receive the filtered digital audio input signal and convert the filtered digital audio input signal into an equivalent analog audio input signal, and a driver configured to receive the equivalent analog audio input signal and drive an analog audio output signal to a transducer.
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公开(公告)号：US10020778B1
公开(公告)日：2018-07-10
申请号：US15651314
申请日：2017-07-17
Inventor： Ku He , Tejasvi Das , John L. Melanson
CPC classification number: H03F1/0205 , H03F1/0272 , H03F1/0277 , H03F3/185 , H03F3/187 , H03F3/2171 , H03F3/2175 , H03F2200/03 , H03F2200/432 , H04R3/04
Abstract: An amplifier may include a first stage configured to receive an input signal at an amplifier input and generate an intermediate signal which is a function of the input signal, and a final output stage configured to generate an output signal which is a function of the intermediate signal at an amplifier output, and a signal feedback network coupled between the amplifier output and input. The final output stage may be switchable among a plurality of modes including at least a first mode in which the final output stage generates the output signal as a modulated output signal which is a function of the intermediate signal, and a second mode in which the final output stage generates the output signal as an unmodulated output signal which is a function of the intermediate signal. Control circuitry may reduce audio artifacts associated with switching between modes.
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公开(公告)号：US10797651B2
公开(公告)日：2020-10-06
申请号：US16348824
申请日：2018-04-27
Inventor： Graeme Gordon Mackay , Lei Zhu , Ku He , Vamsikrishna Parupalli
Abstract: In accordance with embodiments of the present disclosure, a method for power supply rejection for an amplifier may include generating a correction signal by multiplying a quantity indicative of a power supply voltage of the amplifier by a transfer function defining a response from the power supply voltage of the amplifier to an output signal of the amplifier and subtracting the correction signal from a signal within a signal path of a circuit comprising the amplifier.
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公开(公告)号：US10313790B1
公开(公告)日：2019-06-04
申请号：US16103339
申请日：2018-08-14
Inventor： Ku He , Tejasvi Das , John L. Melanson
IPC: H04R3/02 , G11B27/022 , G11B20/24 , G10L21/0208
Abstract: A polymorphic playback system in which one or more parameters of a signal path of the polymorphic playback system are varied based on one or more characteristics of a playback signal processed by the signal path may include a control subsystem configured to detect an out-of-band noise profile of the playback signal and set one or more playback signal magnitude thresholds for switching between polymorphic modes of the polymorphic playback system based on the out-of-band noise profile, wherein the polymorphic modes comprise at least a first polymorphic mode in which one or more first parameters are applied to the signal path and a second polymorphic mode in which one or more second parameters are applied to the signal path.
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Patent Agency Ranking
公开(公告)号：US09967665B2
公开(公告)日：2018-05-08
申请号：US15286289
申请日：2016-10-05
Inventor： Tejasvi Das , Ku He , John L. Melanson
CPC classification number: H04R3/04 , H03F3/187 , H03F3/45475 , H03F3/45596 , H03F2200/78 , H03F2203/45048 , H03F2203/45522 , H03G3/04 , H03G3/3005 , H03G3/3089 , H03G3/32 , H03G7/002 , H03G7/007 , H04R2430/03
Abstract: An analog signal path portion of a signal path may have: (i) an audio input for receiving an analog signal, an audio output for providing an output signal, and a selectable analog gain, and may be configured to generate the output signal based on the analog signal and in conformity with the selectable analog gain; and (ii) a digital path portion having a selectable digital gain and configured to receive a digital input signal and convert the digital input signal into the analog signal in conformity with the selectable digital gain. A control circuit may be configured to modify the digital and analog gains in response to an indication to switch between gain modes of the signal path, determine a noise floor of an audio signal comprising the digital input signal or a signal derived therefrom, and control modification of the digital and analog gains based on the noise floor.
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公开(公告)号：US12039964B2
公开(公告)日：2024-07-16
申请号：US17540376
申请日：2021-12-02
Inventor： Ku He , Venugopal Choukinishi , Kemal S. Demirci , David M. Olivenbaum , Amar Vellanki , Xin Zhao , Wai-Shun Shum , Xiaofan Fei
IPC: G10K11/175 , H03F1/32 , H03F3/185 , H03G3/30 , G10K11/178 , H04R3/00
CPC classification number: G10K11/1752 , H03F1/3264 , H03F3/185 , H03G3/3005 , G10K11/178 , H03F2200/03 , H04R3/005
Abstract: An audio processing system reduces perception of audible artifacts due to changes in an element in an audio channel of the audio processing system. The system reproduces an audio input signal and produces an audio output signal with the audio channel. The channel has an adjustable or selectable element that, responsive to a control signal, changes a characteristic of the audio processing channel, which generates a transient in the audio output signal. The systems include a level detector for measuring a signal level of the audio input signal and a controller responsive to an output of the level detector to determine a masking time interval available from the audio output signal due to signal content in the audio input signal. The controller generates the control signal to change the characteristic of the audio processing channel so that at least a portion of the transient occurs in the masking time interval.
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公开(公告)号：US11539331B2
公开(公告)日：2022-12-27
申请号：US17348982
申请日：2021-06-16
Inventor： Amar Vellanki , Xin Zhao , Jing Bai , John L. Melanson , Ku He , Wai-Shun Shum , Xiaofan Fei , Alan M. Morton
Abstract: An amplification system with an output driver stage for providing an output signal to acoustic output transducers such as speakers or haptic output devices removes signal distortion caused by output stage non-linearities by pre-distorting an input signal. The system includes the output driver stage, an input stage for receiving the input signal, and a processing block that receives the input signal and provides an output signal to the output driver stage. The processing block includes a pre-distortion circuit that applies a pre-distortion function to the input signal to generate the output signal if a signal level of the input signal is greater than a threshold amplitude, and if the signal level is less than or equal to the threshold amplitude, generates the output signal from the input signal by bypassing the pre-distortion circuit.
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公开(公告)号：US20220329212A1
公开(公告)日：2022-10-13
申请号：US17348982
申请日：2021-06-16
Inventor： Amar Vellanki , Xin Zhao , Jing Bai , John L. Melanson , Ku He , Wai-Shun Shum , Xiaofan Fei , Alan M. Morton
Abstract: An amplification system with an output driver stage for providing an output signal to acoustic output transducers such as speakers or haptic output devices removes signal distortion caused by output stage non-linearities by pre-distorting an input signal. The system includes the output driver stage, an input stage for receiving the input signal, and a processing block that receives the input signal and provides an output signal to the output driver stage. The processing block includes a pre-distortion circuit that applies a pre-distortion function to the input signal to generate the output signal if a signal level of the input signal is greater than a threshold amplitude, and if the signal level is less than or equal to the threshold amplitude, generates the output signal from the input signal by bypassing the pre-distortion circuit.
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公开(公告)号：US20220284877A1
公开(公告)日：2022-09-08
申请号：US17540376
申请日：2021-12-02
Inventor： Ku He , Venugopal Choukinishi , Kemal S. Demirci , David M. Olivenbaum , Amar Vellanki , Xin Zhao , Wai-Shun Shum , Xiaofan Fei
IPC: G10K11/178 , H04R3/00
Abstract: An audio processing system reduces perception of audible artifacts due to changes in an element in an audio channel of the audio processing system. The system reproduces an audio input signal and produces an audio output signal with the audio channel. The channel has an adjustable or selectable element that, responsive to a control signal, changes a characteristic of the audio processing channel, which generates a transient in the audio output signal. The systems include a level detector for measuring a signal level of the audio input signal and a controller responsive to an output of the level detector to determine a masking time interval available from the audio output signal due to signal content in the audio input signal. The controller generates the control signal to change the characteristic of the audio processing channel so that at least a portion of the transient occurs in the masking time interval.
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