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    Determining noise and sound power level differences between primary and reference channels
    1.
    发明授权
    Determining noise and sound power level differences between primary and reference channels 有权

    公开(公告)号：US10127919B2

    公开(公告)日：2018-11-13

    申请号：US14938798

    申请日：2015-11-11

    Applicant: Cirrus Logic Inc.

    Inventor： Jan S. Erkelens

    IPC: H04R29/00 ,  G10L21/0232 ,  G10L25/12 ,  G10L25/21 ,  H04R3/00

    Abstract: A method for estimating a noise power level difference (NPLD) between a primary microphone and a reference microphone of an audio device includes obtaining primary and reference channels of an audio signal with primary and reference microphones of an audio device and estimating a noise magnitude of the reference channel of the audio signal to provide a noise variance estimate for one or more frequencies. A modelled probability density function (PDF) of a fast Fourier transform (FFT) coefficient of the primary channel of the audio signal is maximized to provide a NPLD between the noise variance estimate of the reference channel and a noise variance estimate of the primary channel. A modelled PDF of an FFT coefficient of the reference channel of the audio signal is maximized to provide a complex speech power level difference (SPLD) coefficient between the speech FFT coefficients of the primary and reference channel. A corrected noise magnitude of the reference channel is then calculated based on the noise variance estimate, the NPLD and the SPLD coefficient.

    Determining noise and sound power level differences between primary and reference channels
    3.
    发明授权
    Determining noise and sound power level differences between primary and reference channels 有权

    公开(公告)号：US10332541B2

    公开(公告)日：2019-06-25

    申请号：US15730152

    申请日：2017-10-11

    Applicant: Cirrus Logic, Inc.

    Inventor： Jan S. Erkelens

    IPC: G10L25/21 ,  G10L21/0232 ,  G10L25/12 ,  H04R29/00 ,  H04R3/00 ,  G10L21/0216

    Abstract: A method for estimating and minimizing a noise power level difference (NPLD) between a primary channel and a reference channel of an audio device, includes receiving, by a primary channel, an audio signal that has a speech signal level and a noise signal level; receiving, by a reference channel, the audio signal with another speech signal level and another noise signal level; using the reference channel to estimate the noise signal level in the primary channel by reducing the another speech signal level; and compensating for a difference between the noise signal level and the another noise signal level to minimize a noise power level difference NPLD between the primary channel and the reference channel.

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