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    Signal component estimation using coherence
    1.
    发明授权
    Signal component estimation using coherence 有权

    公开(公告)号：US12033657B2

    公开(公告)日：2024-07-09

    申请号：US17607649

    申请日：2020-04-30

    Applicant: Bose Corporation

    Inventor： Shiufun Cheung ,  Zukui Song ,  Cristian Marius Hera ,  Davis Y. Pan

    IPC: G10L25/21 ,  G10L21/0232 ,  H04R3/04 ,  G10L21/0208 ,  G10L21/0216

    CPC classification number: G10L25/21 ,  G10L21/0232 ,  H04R3/04 ,  G10L2021/02082 ,  G10L2021/02163

    Abstract: Systems, methods, and machine-readable storage devices that receive an input signal representing audio captured using a microphone. The input signal includes portions that represent acoustic output from one or more audio sources, and a portion that represents other acoustic energy in the environment. A frequency domain representation of the input signal is iteratively modified to substantially reduce effects due to all but a selected one of the portions, from which an estimate of the power spectral density, PSD, of the selected portion is determined. Based upon the estimated PSD a noise or echo component is reduced, or a replacement noise is provided. The iterative modification involves a diagonalization of the cross-spectral density matrix to remove content coherent with a first audio input from the auto and cross-spectra of other signals.

    SIGNAL COMPONENT ESTIMATION USING COHERENCE
    2.
    发明申请
    SIGNAL COMPONENT ESTIMATION USING COHERENCE 有权

    公开(公告)号：US20220199105A1

    公开(公告)日：2022-06-23

    申请号：US17607649

    申请日：2020-04-30

    Applicant: Bose Corporation

    Inventor： Shiufun Cheung ,  Zukui Song ,  Cristian Marius Hera ,  Davis Y. Pan

    IPC: G10L25/21 ,  G10L21/0232 ,  H04R3/04

    Abstract: Systems, methods, and machine-readable storage devices that receive an input signal representing audio captured using a microphone. The input signal includes portions that represent acoustic output from one or more audio sources, and a portion that represents other acoustic energy in the environment. A frequency domain representation of the input signal is iteratively modified to substantially reduce effects due to all but a selected one of the portions, from which an estimate of the power spectral density, PSD, of the selected portion is determined. Based upon the estimated PSD a noise or echo component is reduced, or a replacement noise is provided. The iterative modification involves a diagonalization of the cross-spectral density matrix to remove content coherent with a first audio input from the auto and cross-spectra of other signals.

    Dynamic Audio Headroom Management System
    3.
    发明申请
    Dynamic Audio Headroom Management System 有权

    公开(公告)号：US20220174442A1

    公开(公告)日：2022-06-02

    申请号：US17108633

    申请日：2020-12-01

    Applicant: Bose Corporation

    Inventor： Elie Bou Daher ,  Cristian M. Hera ,  Shiufun Cheung

    IPC: H04S7/00 ,  H04S3/00

    Abstract: In an audio system with a plurality of input signals, the input signals are prioritized from least important to most important. The level of the aggregate of all of the input signals is compared to a threshold level. If the level is greater than the threshold, the levels of one or more of the input signals are reduced one at a time, in order from the least important input signal to the most important input signal.

    Noise estimation for dynamic sound adjustment
    4.
    发明授权
    Noise estimation for dynamic sound adjustment 有权

    公开(公告)号：US10542346B2

    公开(公告)日：2020-01-21

    申请号：US16215755

    申请日：2018-12-11

    Applicant: Bose Corporation

    Inventor： Zukui Song ,  Shiufun Cheung

    IPC: H04R3/04 ,  H04R3/00

    Abstract: A system that performs noise estimation for an audio adjustment application comprises a coherence calculator that determines at least one coherence value between microphone signals generated by at least two microphones that each independently senses acoustic energy in a listening space. A first microphone of the at least two microphones generates a first microphone signal from the acoustic energy and a second microphone of the at least two microphones generates a second microphone signal from the acoustic energy. The acoustic energy comprises a combination of an audio signal transduced by one or more speakers and environmental noise of the acoustic energy that is local to the listening space. A noise estimate computation processor determines an estimate of a level of the environmental noise based on the at least one coherence value.

    DYNAMIC SOUND ADJUSTMENT BASED ON NOISE FLOOR ESTIMATE
    7.
    发明申请
    DYNAMIC SOUND ADJUSTMENT BASED ON NOISE FLOOR ESTIMATE 审中-公开

    公开(公告)号：US20190341020A1

    公开(公告)日：2019-11-07

    申请号：US16512464

    申请日：2019-07-16

    Applicant: Bose Corporation

    Inventor： Shiufun Cheung ,  Zukui Song

    IPC: G10K11/178 ,  G10L21/0208 ,  G10L21/0216

    Abstract: The technology described in this document can be embodied in a method that includes receiving a plurality of representations of the signal corresponding to samples of the signal within a frame of predetermined time duration, and estimating a power spectral density (PSD) for each of a plurality of frequency bins. The PSD for a particular frequency bin is estimated based on a smoothing parameter calculated from a noise estimate for the particular frequency bin as obtained from samples corresponding to a preceding frame. The method also includes generating, based on the PSD for each of the plurality of frequency bins, an estimate of the steady-state noise floor, and computing a measure of spectral flatness associated with the samples within the frame. The method also includes determining that the measure of spectral flatness satisfies a threshold condition, and in response, computing an updated estimate of the steady-state noise floor.

    Dynamic sound adjustment based on noise floor estimate
    8.
    发明授权
    Dynamic sound adjustment based on noise floor estimate 有权

    公开(公告)号：US10360895B2

    公开(公告)日：2019-07-23

    申请号：US15850847

    申请日：2017-12-21

    Applicant: Bose Corporation

    Inventor： Shiufun Cheung ,  Zukui Song

    IPC: G10K11/178

    Abstract: The technology described in this document can be embodied in a method that includes receiving a plurality of representations of the signal corresponding to samples of the signal within a frame of predetermined time duration, and estimating a power spectral density (PSD) for each of a plurality of frequency bins. The PSD for a particular frequency bin is estimated based on a smoothing parameter calculated from a noise estimate for the particular frequency bin as obtained from samples corresponding to a preceding frame. The method also includes generating, based on the PSD for each of the plurality of frequency bins, an estimate of the steady-state noise floor, and computing a measure of spectral flatness associated with the samples within the frame. The method also includes determining that the measure of spectral flatness satisfies a threshold condition, and in response, computing an updated estimate of the steady-state noise floor.

    DYNAMIC SOUND ADJUSTMENT BASED ON NOISE FLOOR ESTIMATE
    9.
    发明申请
    DYNAMIC SOUND ADJUSTMENT BASED ON NOISE FLOOR ESTIMATE 审中-公开

    公开(公告)号：US20190198005A1

    公开(公告)日：2019-06-27

    申请号：US15850847

    申请日：2017-12-21

    Applicant: Bose Corporation

    Inventor： Shiufun Cheung ,  Zukui Song

    IPC: G10K11/178

    CPC classification number: G10K11/17827 ,  G10K11/17813 ,  G10K11/17881 ,  G10K11/17883 ,  G10L21/0208 ,  G10L21/0216

    Abstract: The technology described in this document can be embodied in a method that includes receiving a plurality of representations of the signal corresponding to samples of the signal within a frame of predetermined time duration, and estimating a power spectral density (PSD) for each of a plurality of frequency bins. The PSD for a particular frequency bin is estimated based on a smoothing parameter calculated from a noise estimate for the particular frequency bin as obtained from samples corresponding to a preceding frame. The method also includes generating, based on the PSD for each of the plurality of frequency bins, an estimate of the steady-state noise floor, and computing a measure of spectral flatness associated with the samples within the frame. The method also includes determining that the measure of spectral flatness satisfies a threshold condition, and in response, computing an updated estimate of the steady-state noise floor.

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