公开(公告)号：US11490198B1

公开(公告)日：2022-11-01

申请号：US17384983

申请日：2021-07-26

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Ning Li ,  Teja Buddha ,  Mohamed Sabet ,  Doug Olsen

IPC: H04R3/00 ,  G06F3/16

Abstract: A method for detecting wind noise incident on a single microphone may include receiving an audio signal indicative of sound incident on the single microphone, dividing the audio signal into a plurality of audio frames, and determining whether wind noise is incident on the single microphone based on a combination of a correlation metric between successive audio frames of the plurality of audio frames and a power ratio difference between a first power ratio and a second power ratio. The first power ratio may equal an amount of power present in a first frequency range of the audio signal to a total amount of power present in the audio signal across all frequencies. The second power ratio may equal an amount of power present in a second frequency range of the audio signal to the total amount of power present in the audio signal across all frequencies.

公开(公告)号：US11682376B1

公开(公告)日：2023-06-20

申请号：US17713302

申请日：2022-04-05

Applicant: Cirrus Logic International Semiconductor Ltd.

Inventor： Khosrow Lashkari ,  Doug Olsen

IPC: G10K11/178

CPC classification number: G10K11/17853 ,  G10K11/17837

Abstract: An ambient-aware audio system reduces stationary noise and maintains dynamic environmental sound in a received input audio signal. The system includes a signal-to-noise ratio (SNR) estimator that estimates an a priori SNR and an a posteriori SNR, a gain function that uses the estimated SNRs as inputs to compute coefficients of a frequency domain noise reduction filter that uses the computed coefficients to filter a frame of the input audio signal to generate an output audio signal. The SNR estimator, gain function, and filter are configured to iterate over a plurality of frames of the input audio signal. The SNRs are estimated using the input audio signal and the output audio signal associated with one or more of the plurality of frames. The gain function is derived to minimize an expected value of differences between spectral amplitudes of the output audio signal and the input audio signal.