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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：US11798978B2
公开(公告)日：2023-10-24
申请号：US17019621
申请日：2020-09-14
Inventor： John L. Melanson , Lei Zhu , Wai-Shun Shum , Xiaofan Fei , Johann G. Gaboriau
IPC: H01L23/52 , H01L49/02 , H03F1/02 , H01L23/522
CPC classification number: H01L28/10 , H01L23/5227 , H03F1/0272
Abstract: A single integrated circuit may include a signal path configured to generate an output signal from an input signal, wherein the signal path includes an amplifier configured to drive the output signal, a direct-current-to-direct-current (DC-DC) power converter having a power inductor integrated in the single integrated circuit and configured to generate a supply voltage to the amplifier from a source voltage to the DC-DC power converter, and control circuitry for controlling operation of converter switches of the DC-DC power converter in order that the supply voltage tracks at least one among the input signal and the output signal.
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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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Patent Agency Ranking
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：US11552567B2
公开(公告)日：2023-01-10
申请号：US17218992
申请日：2021-03-31
Inventor： Xin Zhao , Jun Yan , Xiaofan Fei , Mark May , John L. Melanson
Abstract: A single-inductor multiple output (SIMO) switched-power DC-DC converter for a class-D amplifier provides outputs that are symmetric about a common-mode input voltage of the amplifier, while remaining asymmetric about a return terminal of the amplifier and switching converter. The DC-DC converter includes an inductive element, a switching circuit that energizes the inductive element from an input source, and a control circuit that controls the switching circuit. The control circuit may have multiple switching modes, and in one of the multiple switching modes, the switching circuit may couple the inductive element between outputs of the converter so that stored energy produces a differential change between the voltages of the outputs. The control circuit may implement a first control loop that maintains a common mode voltage of the pair of outputs at a predetermined voltage independent of the individual voltages of the pair of outputs.
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公开(公告)号：US11522509B2
公开(公告)日：2022-12-06
申请号：US17194395
申请日：2021-03-08
Inventor： Xin Zhao , Tejasvi Das , Xiaofan Fei
IPC: H03F3/45
Abstract: An operational amplifier with one or more fully-differential amplifier stages has a common-mode control input. A low-frequency feedback control path is coupled between an output of the fully-differential amplifier stages and the common-mode control input to control low-frequency drift of the common-mode voltage of the output of the stages. A high-frequency feed-forward control path couples a pair of inputs of the stages to control high-frequency ripple of a common-mode voltage of the inputs of the stages. One or more of the differential amplifier stages may have a bias input that controls a direct-current (DC) bias voltage of gates of pull-up transistors of the stage that is both DC and capacitively coupled to the gates so that the stage operates with class A bias at DC and with class AB bias at high frequencies.
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公开(公告)号：US20220286098A1
公开(公告)日：2022-09-08
申请号：US17194395
申请日：2021-03-08
Inventor： Xin Zhao , Tejasvi Das , Xiaofan Fei
IPC: H03F3/45
Abstract: An operational amplifier with one or more fully-differential amplifier stages has a common-mode control input. A low-frequency feedback control path is coupled between an output of the fully-differential amplifier stages and the common-mode control input to control low-frequency drift of the common-mode voltage of the output of the stages. A high-frequency feed-forward control path couples a pair of inputs of the stages to control high-frequency ripple of a common-mode voltage of the inputs of the stages. One or more of the differential amplifier stages may have a bias input that controls a direct-current (DC) bias voltage of gates of pull-up transistors of the stage that is both DC and capacitively coupled to the gates so that the stage operates with class A bias at DC and with class AB bias at high frequencies.
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公开(公告)号：US11050433B1
公开(公告)日：2021-06-29
申请号：US16945520
申请日：2020-07-31
Inventor： John L. Melanson , Johann G. Gaboriau , Lei Zhu , Wai-Shun Shum , Xiaofan Fei , Leyi Yin
Abstract: A system may include a current digital-to-analog converter (IDAC) configured to convert a digital input signal into an output current signal and a switched-mode power supply configured to provide electrical energy in the form of a supply voltage to the IDAC for operation of the IDAC, the switched-mode power supply configured to track a voltage signal derived from the digital input current signal and generate the supply voltage based on the voltage signal and a voltage headroom above the voltage signal.
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