公开(公告)号：US20190214036A1

公开(公告)日：2019-07-11

申请号：US16242424

申请日：2019-01-08

Applicant: Avnera Corporation

Inventor： David Wurtz ,  Michael Wurtz ,  Amit Kumar ,  Colin Doolittle

IPC: G10L21/0216 ,  G10L15/20 ,  G10L25/78

CPC classification number: G10L21/0216 ,  G10K11/17827 ,  G10K11/17833 ,  G10K2210/108 ,  G10L15/20 ,  G10L21/0208 ,  G10L25/78 ,  G10L2021/02082 ,  G10L2021/02165 ,  G10L2021/02166 ,  H04M9/082 ,  H04R1/1083 ,  H04R3/005 ,  H04R5/033

Abstract: The disclosure includes a voice isolation system comprising an acoustic echo-cancelation subsystem configured to receive a plurality of input signals, subtract an interference component from the input signals, and provide a plurality of output signals. The system also includes an adaptive beamformer subsystem configured to receive the plurality of output signals from the acoustic echo-cancelation subsystem and compute a signal-to-noise ratio enhanced signal based on the received output signals. The system also includes a residual noise suppressor subsystem configured to attenuate at least one portion of the SNR enhanced signal received from the adaptive beamformer subsystem based on the at least one portion having an SNR below a predetermined SNR threshold. The system also includes an automatic gain control subsystem configured to process a signal outputted from the residual noise suppressor subsystem and transmit a resulting signal as an output signal.

公开(公告)号：US10283103B2

公开(公告)日：2019-05-07

申请号：US15916885

申请日：2018-03-09

Applicant: Avnera Corporation

Inventor： Amit Kumar

IPC: G10K11/175 ,  G10K11/178

Abstract: The disclosure includes an acoustic processing network comprising a Digital Signal Processor (DSP) operating at a first frequency and a Real-Time Acoustic Processor (RAP) operating at a second frequency higher than the first frequency. The DSP receives a noise signal from at least one microphone. The DSP then generates a noise filter based on the noise signal. The RAP receives the noise signal from the microphone and the noise filter from the DSP. The RAP then generates an anti-noise signal based on the noise signal and the noise filter for use in Active Noise Cancellation (ANC).

公开(公告)号：US10231047B2

公开(公告)日：2019-03-12

申请号：US15946194

申请日：2018-04-05

Applicant: Avnera Corporation

Inventor： Amit Kumar ,  Eric Sorensen ,  Shankar Rathoud

IPC: H04R1/10 ,  G10K11/178 ,  H04R3/00 ,  H04R29/00

Abstract: A headphone detector including a headphone and a processor. The headphone has a microphone and a speaker, and the microphone is configured to generate an audio signal based on an output of the speaker. The processor is configured to receive the audio signal, determine a characteristic of the audio signal, and assess whether the headphone is on ear or off ear based on a comparison of the characteristic to a threshold. The threshold corresponds to one or more of an audio response of the audio signal at a corresponding frequency and an audio response of a feedback microphone signal at a corresponding frequency, under one or more known conditions.

公开(公告)号：US20180337636A1

公开(公告)日：2018-11-22

申请号：US15984250

申请日：2018-05-18

Applicant: Avnera Corporation

Inventor： Gilbert C. Martinez ,  Amit Kumar ,  Ali Hadiashar ,  Mark Gehring ,  Wai Lee

IPC: H03F1/02 ,  H03F3/183 ,  H03M1/00 ,  H03M3/00 ,  H03G3/30

Abstract: An audio system can include an amplifier having two parallel drivers, one having common source transistors and one having common drain transistors, also called source following. At low signals, the source followers dominate the open-loop gain signal path, while large signals cause the common source transistors to be dominant. At low signal amplitudes, the common source transistor gain is reduced and the common drain transistors provide the load current. At a pre-determined level of signal amplitude, the common source transistors take over and provide the current load. A calibration system for a DAC is also provided. The calibration system measures individual cell performance in the DAC, then stores its digital equivalent in a coefficient storage. Then, a quantizer can refer to the stored coefficients when selecting the appropriate final quantized digital value.

公开(公告)号：US20180227659A1

公开(公告)日：2018-08-09

申请号：US15946194

申请日：2018-04-05

Applicant: Avnera Corporation

Inventor： Amit Kumar ,  Eric Sorensen ,  Shankar Rathoud

IPC: H04R1/10 ,  G10K11/178

CPC classification number: H04R1/1041 ,  G10K11/178 ,  G10K11/17855 ,  G10K2210/1081 ,  G10K2210/3021 ,  H04R1/1083 ,  H04R3/00 ,  H04R29/00 ,  H04R2410/05 ,  H04R2460/03

Abstract: A headphone detector including a headphone and a processor. The headphone has a microphone and a speaker, and the microphone is configured to generate an audio signal based on an output of the speaker. The processor is configured to receive the audio signal, determine a characteristic of the audio signal, and assess whether the headphone is on ear or off ear based on a comparison of the characteristic to a threshold. The threshold corresponds to one or more of an audio response of the audio signal at a corresponding frequency and an audio response of a feedback microphone signal at a corresponding frequency, under one or more known conditions.

公开(公告)号：US09980034B2

公开(公告)日：2018-05-22

申请号：US15792394

申请日：2017-10-24

Applicant: Avnera Corporation

Inventor： Amit Kumar ,  Shankar Rathoud ,  Mike Wurtz ,  Eric Etheridge ,  Eric Sorensen

IPC: H04R1/10 ,  H04R29/00 ,  G10K11/178

CPC classification number: H04R1/1041 ,  G10K11/178 ,  G10K2210/1081 ,  G10K2210/3026 ,  G10K2210/3027 ,  H04R1/1008 ,  H04R29/001 ,  H04R2460/01

Abstract: Disclosed is a signal processor for headphone off-ear detection. The signal processor includes an audio output to transmit an audio signal toward a headphone speaker in a headphone cup. The signal processor also includes a feedback (FB) microphone input to receive a FB signal from a FB microphone in the headphone cup. The signal processor also includes an off-ear detection (OED) signal processor to determine an audio frequency response of the FB signal over an OED frame as a received frequency response. The OED processor also determines an audio frequency response of the audio signal times an off-ear transfer function between the headphone speaker and the FB microphone as an ideal off-ear response. A difference metric si generated comparing the received frequency response to the ideal off-ear frequency response. The difference metric is employed to detect when the headphone cup is disengaged from an ear.

公开(公告)号：US20180137851A1

公开(公告)日：2018-05-17

申请号：US15570273

申请日：2016-10-14

Applicant: Avnera Corporation

Inventor： Amit Kumar ,  Eric Sorensen

IPC: G10K11/178

CPC classification number: G10K11/178 ,  G10K2210/1081 ,  G10K2210/3014 ,  G10K2210/3026 ,  G10K2210/3027 ,  G10K2210/3028

Abstract: A system including an automatic noise canceling (ANC) headphone and a processor. The ANC headphone has a microphone configured to generate a microphone signal and at least two non-zero ANC gain levels. The processor is configured to receive the microphone signal, determine a characteristic of the microphone signal, identify a revised ANC level from the ANC gain levels based on a comparison of the characteristic to at least one threshold, and output a signal corresponding to the revised ANC level. Methods are also disclosed.

公开(公告)号：US20180115815A1

公开(公告)日：2018-04-26

申请号：US15792394

申请日：2017-10-24

Applicant: Avnera Corporation

Inventor： Amit Kumar ,  Shankar Rathoud ,  Mike Wurtz ,  Eric Etheridge ,  Eric Sorensen

IPC: H04R1/10 ,  H04R29/00

CPC classification number: H04R1/1041 ,  G10K11/178 ,  G10K2210/1081 ,  G10K2210/3026 ,  G10K2210/3027 ,  H04R1/1008 ,  H04R29/001 ,  H04R2460/01

Abstract: Disclosed is a signal processor for headphone off-ear detection. The signal processor includes an audio output to transmit an audio signal toward a headphone speaker in a headphone cup. The signal processor also includes a feedback (FB) microphone input to receive a FB signal from a FB microphone in the headphone cup. The signal processor also includes an off-ear detection (OED) signal processor to determine an audio frequency response of the FB signal over an OED frame as a received frequency response. The OED processor also determines an audio frequency response of the audio signal times an off-ear transfer function between the headphone speaker and the FB microphone as an ideal off-ear response. A difference metric si generated comparing the received frequency response to the ideal off-ear frequency response. The difference metric is employed to detect when the headphone cup is disengaged from an ear.

公开(公告)号：US20170013345A1

公开(公告)日：2017-01-12

申请号：US14850859

申请日：2015-09-10

Applicant: Avnera Corporation

Inventor： Amit Kumar ,  Eric Sorensen ,  Shankar Rathoud

IPC: H04R1/10

CPC classification number: H04R1/1041 ,  G10K11/178 ,  G10K11/17855 ,  G10K2210/1081 ,  G10K2210/3021 ,  H04R1/1083 ,  H04R3/00 ,  H04R29/00 ,  H04R2410/05 ,  H04R2460/03

Abstract: A headphone detector including a headphone and a processor. The headphone has a microphone and a speaker, and the microphone is configured to generate an audio signal based on an output of the speaker. The processor is configured to receive the audio signal, determine a characteristic of the audio signal, and assess whether the headphone is on ear or off ear based on a comparison of the characteristic to a threshold. In another aspect, an off-ear detection (OED) system includes a headphone and an OED processor. The headphone has a speaker, a feedforward microphone, and a feedback microphone. The OED processor is configured to determine whether the headphone is off ear or on ear, based at least in part on a headphone audio signal, a feedforward microphone signal, and a feedback microphone signal.

Abstract translation: 一种耳机检测器，包括耳机和处理器。 耳机具有麦克风和扬声器，麦克风被配置为基于扬声器的输出产生音频信号。 处理器被配置为接收音频信号，确定音频信号的特性，并且基于特征与阈值的比较来评估耳机是耳朵还是耳朵。 在另一方面，一种耳朵检测（OED）系统包括耳机和OED处理器。 耳机具有扬声器，前馈麦克风和反馈麦克风。 OED处理器被配置为至少部分地基于耳机音频信号，前馈麦克风信号和反馈麦克风信号来确定耳机是否脱离耳朵或耳朵。

公开(公告)号：US08643525B1

公开(公告)日：2014-02-04

申请号：US13733301

申请日：2013-01-03

Applicant: Avnera Corporation

Inventor： Jianping Wen ,  Amit Kumar ,  Garry N. Link ,  Wai Laing Lee

IPC: H03M1/66

CPC classification number: H03M1/067 ,  H03M1/74 ,  H03M3/502

Abstract: A system and method dynamically selects digital-to-analog (DAC) circuit elements to provide a True differential-output delta-sigma (ΔΣ) DAC. The sign and magnitude of a received N-bit input code is determined. If the input code comprises a positive value, m+r circuit elements are selected from a plurality of circuit elements by a positive element selector, in which comprises a number of rotational elements, and r circuit elements are selected by a negative element selector. Each selected circuit element comprises a circuit element that was not selected for an immediately preceding received input code and has a corresponding minimum usage count value. If the input digital code comprises a negative value, m+r circuit elements are selected by the negative element selector, and r circuit elements are selected by the positive element selector. The circuit elements are capable of being configured as positive or negative circuit elements.

Abstract translation: 一种系统和方法动态地选择数模（DAC）电路元件，以提供真差分输出Δ-Σ（DeltaSigma）DAC。 确定接收到的N位输入代码的符号和大小。 如果输入代码包括正值，则通过正元件选择器从多个电路元件中选择m + r个电路元件，其中包括多个旋转元件，并且r个电路元件由负元件选择器选择。 每个所选择的电路元件包括未被选择用于紧接在前的接收输入代码并且具有对应的最小使用计数值的电路元件。 如果输入数字代码包含负值，则由负选择器选择m + r个电路元件，并且通过正元件选择器选择r个电路元件。 电路元件能够被配置为正或负电路元件。