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    Automatic noise cancellation using multiple microphones
    1.
    发明授权
    Automatic noise cancellation using multiple microphones 有权

    公开(公告)号：US11056093B2

    公开(公告)日：2021-07-06

    申请号：US16446064

    申请日：2019-06-19

    Applicant: Avnera Corporation

    Inventor： James Scanlan

    IPC: H04R1/10 ,  G10K11/178 ,  H04R1/40 ,  H04R3/00 ,  H04R29/00

    Abstract: The disclosure includes a headset comprising one or more earphones including one or more sensing components. The headset also includes one or more voice microphones to record a voice signal for voice transmission. The headset also includes a signal processor coupled to the earphones and the voice microphones. The signal processor is configured to employ the sensing components to determine a wearing position of the headset. The signal processor then selects a signal model for noise cancellation. The signal model is selected from a plurality of signal models based on the determined wearing position. The signal processor also applies the selected signal model to mitigate noise from the voice signal prior to voice transmission.

    Headphone off-ear detection
    2.
    发明授权
    Headphone off-ear detection 有权

    公开(公告)号：US11032631B2

    公开(公告)日：2021-06-08

    申请号：US16505554

    申请日：2019-07-08

    Applicant: Avnera Corporation

    Inventor： Deepika Kumari ,  Colin Michael Doolittle ,  Amit Kumar

    IPC: H04R1/10 ,  H04R3/04 ,  H04R3/00 ,  H04R29/00 ,  H04R1/40 ,  G10L25/21 ,  G10K11/175

    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 is 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.

    Headphone with off-ear and on-ear detection
    3.
    发明授权
    Headphone with off-ear and on-ear detection 有权

    公开(公告)号：US10945062B2

    公开(公告)日：2021-03-09

    申请号：US16274075

    申请日：2019-02-12

    Applicant: Avnera Corporation

    Inventor： Amit Kumar ,  Eric Sorensen ,  Shankar Rathoud

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

    Abstract: A headphone having a speaker, a feedforward microphone, a feedback microphone, and an OED processor. The speaker is configured to transmit an audio playback signal based on a headphone audio signal. The feedforward microphone is configured to sense an ambient noise signal and transmit a feedforward microphone signal based at least in part on the ambient noise signal. The feedback microphone is configured to sense a total audio signal and transmit a feedback microphone signal based at least in part on the total audio signal, in which the total audio signal is the sum of the audio playback signal and at least a portion of the ambient noise level. The OED processor is configured to determine whether the headphone is off ear or on ear, based at least in part on the headphone audio signal, the feedforward microphone signal, and the feedback microphone signal.

    SPDIF clock and data recovery with sample rate converter
    5.
    发明授权
    SPDIF clock and data recovery with sample rate converter 有权

    公开(公告)号：US10476659B2

    公开(公告)日：2019-11-12

    申请号：US16049474

    申请日：2018-07-30

    Applicant: AVNERA CORPORATION

    Inventor： Samuel J. Peters, II ,  Eric P. Etheridge ,  Victor Lee Hansen ,  Alexander C. Stange

    IPC: H04L7/033 ,  G06F13/42 ,  H04L7/00 ,  H04L7/02

    Abstract: A system can include a digital oversampler configured to oversample an input data stream; a rate generator configured to select a frequency that is not less than an expected frequency of the input data stream; a rate generator clock of the rate generator configured to output a clock signal that has the selected frequency; a sample receiver configured to receive at least one sample of the input data stream from the digital oversampler; a sample counter configured to be incremented by each received sample responsive to a determination that the sample receiver has received at least one sample of the input data stream from the digital oversampler; a sample rate converter configured to accumulate samples from the sample receiver at the rate of a “toothless” clock signal, wherein the sample counter is configured to be decremented by the “toothless” clock signal at the selected frequency responsive to a determination that the sample receiver has not received at least one sample of the input data stream from the digital oversampler; and an AND gate configured to pass the “toothless” clock signal to the sample rate converter responsive to a determination that an output of the sample counter is greater than zero.

    HEADPHONE OPERATION DURING HEADPHONE INSERTION DETECTION
    6.
    发明申请
    HEADPHONE OPERATION DURING HEADPHONE INSERTION DETECTION 审中-公开

    公开(公告)号：US20190335263A1

    公开(公告)日：2019-10-31

    申请号：US16398043

    申请日：2019-04-29

    Applicant: AVNERA CORPORATION

    Inventor： Michael Jon Wurtz ,  Amit Kumar ,  Jiajin An

    IPC: H04R1/10 ,  H04R1/08

    Abstract: A method of operating a headphone configured to be removed from and placed in close proximity to a user's ear can include generating an input signal by an input signal generating device. The method can also include determining whether an insertion event has occurred based on the generated input signal and causing the headphone to operate in a low power mode responsive to an absence of an insertion event determination after a first period of time. The method can also include causing the headphone to operate in an ultra-low power mode responsive to the absence of an insertion event determination after a second period of time that occurs after the first period of time, the ultra-low power mode having a lower power consumption than the low power mode.

    Headphone off-ear detection
    7.
    发明授权
    Headphone off-ear detection 有权

    公开(公告)号：US10448140B2

    公开(公告)日：2019-10-15

    申请号：US16174067

    申请日：2018-10-29

    Applicant: Avnera Corporation

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

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

    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.

    Power supply for class G amplifier
    8.
    发明授权
    Power supply for class G amplifier 有权

    公开(公告)号：US10425053B2

    公开(公告)日：2019-09-24

    申请号：US15858101

    申请日：2017-12-29

    Applicant: Avnera Corporation

    Inventor： Garry N. Link ,  Eric King ,  Xudong Zhao ,  Wai Lee ,  Alexander C. Stange ,  Amit Kumar

    IPC: H03G3/00 ,  H03G3/32 ,  H03F1/02 ,  H03F1/30 ,  H03F3/187

    Abstract: A Class G amplifier system including a processing unit configured to receive an input signal and output a delayed processed input signal, a class G amplifier configured to receive the delayed processed input signal, and a power supply. The power supply includes a regulator configured to operate in a plurality of configurations, each configuration outputs a different supply voltage to the class G amplifier and a control circuit configured to receive the input signal and determine the supply voltage required from the regulator when the delayed processed input signal is received at the class G amplifier, and output a signal to the regulator to indicate the required configuration for the required supply voltage.

    REAL-TIME ACOUSTIC PROCESSOR
    9.
    发明申请
    REAL-TIME ACOUSTIC PROCESSOR 审中-公开

    公开(公告)号：US20190259369A1

    公开(公告)日：2019-08-22

    申请号：US16404514

    申请日：2019-05-06

    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).

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