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公开(公告)号：US12041434B2
公开(公告)日：2024-07-16
申请号：US18296266
申请日：2023-04-05
Inventor： John Paul Lesso , Mark James Mccloy-Stevens , John Bruce Bowlerwell , Yanto Suryono , Xin Zhao , Morgan Timothy Prior
CPC classification number: H04R5/04 , H03F3/183 , H03G3/3005 , H04R5/02 , H04R29/001 , H04S1/007 , H03G2201/103
Abstract: This application relates to audio driving circuitry (100), and in particular to audio driving circuitry for outputting first and second audio driving signals for driving a stereo audio load (106), which may be a stereo audio load of an accessory apparatus (102) removably coupled to the audio driving circuitry in use. A load monitor (111) is provided for monitoring to monitor, from a monitoring node (112), an indication of a common mode return current passing through a common return path, together with an indication of a common mode component of the first and second audio driving signals and to determine an impedance characteristic of the stereo audio load. The load monitor (111) can provide dynamic monitoring of any significant change in load impedance. In some embodiments the load monitor (111) comprises an adaptive filter (301) which adapts a parameter of the filter which is related to the load impedance so as to determine the indication of load impedance.
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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：US11536758B2
公开(公告)日：2022-12-27
申请号：US16517046
申请日：2019-07-19
Inventor： Jason L. Wardlaw , Michael A. Kost , Anthony S. Doy , Tejasvi Das , Siddharth Maru , Xin Zhao , Matthew Beardsworth , Bruce E. Duewer
Abstract: A system may include an array of sensor elements, the array of sensor elements each comprising a first type of passive reactive element, a second type of passive reactive element electrically coupled to the array of sensor elements, a driver configured to drive the array of sensor elements and the second type of passive reactive element, and control circuitry configured to control enabling and disabling of individual sensor elements of the array of sensor elements to ensure no more than one of the array of sensor elements is enabled at a time such that when one of the array of sensor elements is enabled, the one of the array of sensor elements and the second type of passive reactive element together operate as a resonant sensor.
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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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Patent Agency Ranking
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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公开(公告)号：US10651801B2
公开(公告)日：2020-05-12
申请号：US16249619
申请日：2019-01-16
Inventor： Lei Zhu , Xin Zhao , John L. Melanson
IPC: H03F3/38 , H03F1/02 , H03F1/56 , H03F3/183 , H03F3/217 , H03G3/30 , H03F1/30 , H03F1/32 , H03F3/187 , H03M1/08 , H03M1/66
Abstract: Resistor mismatch may be digitally compensated based on a known resistor mismatch, power supply information, and/or other operating parameters of the amplifier. The digital compensation may be applied to the digital input signal before conversion for processing and amplification in the analog domain. An amplifier with digital compensation for resistor mismatch may be used in a class-D amplifier with a closed loop and feedforward feedback. A class-D or other amplifier with digital compensation may be integrated with electronic devices such as mobile phones.
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公开(公告)号：US10236827B2
公开(公告)日：2019-03-19
申请号：US15622722
申请日：2017-06-14
Inventor： Lei Zhu , Ku He , Xin Zhao , Miao Song , Saurabh Singh , Vinod Jayakumar
Abstract: A method may include, in an apparatus comprising a closed loop amplifier and a signal processing block configured to generate an amplifier input signal as a function of an upstream signal received at an input of the signal processing block, in a calibration mode of the apparatus: decoupling a second stage input of the amplifier from a first stage output of the amplifier; determining an offset signal that when applied to the input of a signal processing block as the upstream signal generates approximately zero as an intermediate signal generated by the first stage of the amplifier; and controlling one or more parameters of the apparatus based on the offset signal to compensate for an offset of at least one of the first stage and the signal processing block.
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公开(公告)号：US20170019725A1
公开(公告)日：2017-01-19
申请号：US15154350
申请日：2016-05-13
Inventor： Xin Zhao , Brad Lambert , Xiaofan Fei , Eric J. Swanson
CPC classification number: H04R1/1041 , G06F1/3215 , G06F1/3287 , G06F3/165 , H03M1/12 , H03M1/66 , H04M1/6058 , H04R5/04 , H04R2201/107 , H04R2420/05 , H04R2460/03 , Y02D10/171
Abstract: A headset power management system provides robust and low-power operation by detecting various connection conditions by measuring a voltage at the microphone terminal with and without injection of current from the headset. A power management circuit controls an operating state of the headset using a microphone terminal voltage detector and can determine whether a short circuit is present indicating a connection to a device that does not have a microphone input, a negative polarity voltage is present indicating that the device may be determining a connection and type of the headset using the microphone terminal, a normal connection, or whether the headset is not connected to a device at all. Depending on the connection state, some or all of the headset electronics may be disabled until a normal connection is detected. For example the microphone processing circuits may be disabled if the connection does not support a microphone input.
Abstract translation: 头戴式耳机电源管理系统通过检测各种连接条件来提供鲁棒和低功耗的操作，通过测量麦克风端口上的电压，并且不注射来自耳机的电流。 电源管理电路使用麦克风端子电压检测器控制耳机的操作状态，并且可以确定是否存在指示与不具有麦克风输入的设备的连接的短路，存在负极性电压，指示该设备 可以使用麦克风终端，正常连接或耳机是否没有连接到设备来确定耳机的连接和类型。 取决于连接状态，可以禁用部分或全部耳机电子设备，直到检测到正常连接。 例如，麦克风处理电路可能会被禁用，如果连接不支持麦克风输入。
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公开(公告)号：US11255892B2
公开(公告)日：2022-02-22
申请号：US16658755
申请日：2019-10-21
Inventor： Tejasvi Das , Siddharth Maru , Xin Zhao , Matthew Beardsworth , Michael A. Kost , John L. Melanson
IPC: G01R29/18
Abstract: A system may include a sensor having a variable phase response, a dummy impedance having a known phase response, and a measurement circuit communicatively coupled to the sensor and configured to measure first phase information associated with the sensor, measure second phase information associated with the dummy impedance, and determine a phase response of the measurement circuit based on a comparison of the first phase information to the second phase information.
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