公开(公告)号：US20140037100A1

公开(公告)日：2014-02-06

申请号：US13959695

申请日：2013-08-05

Applicant: QSound Labs, Inc.

Inventor： David Giesbrecht

IPC: G10K11/00

CPC classification number: G10K11/002 ,  H04R1/1083 ,  H04R1/406 ,  H04R3/005 ,  H04R29/006 ,  H04R2201/405 ,  H04R2410/05 ,  H04R2430/23 ,  H04R2499/11 ,  H04R2499/13

Abstract: Systems and methods of improved noise reduction include the steps of: receiving an audio signal from two or more acoustic sensors; applying a beamformer to employ a first noise cancellation algorithm; applying a noise reduction post-filter module to the audio signal including: estimating a current noise spectrum of the received audio signal after the application of the first noise cancellation algorithm, wherein the current noise spectrum is estimated using the audio signal received by the second acoustic sensor; determining a punished noise spectrum using the time-average level difference between the audio signal received by the first acoustic sensor and the current noise spectrum; determining a final noise estimate by subtracting the punished noise spectrum from the current noise spectrum; and applying a second noise reduction algorithm to the audio signal received by the first acoustic sensor using the final noise estimate; and outputting an audio stream with reduced background noise.

Abstract translation: 改进噪声降低的系统和方法包括以下步骤：从两个或更多个声学传感器接收音频信号; 应用波束形成器来采用第一噪声消除算法; 将噪声降低后置滤波器模块应用于所述音频信号，包括：在应用所述第一噪声消除算法之后估计接收到的音频信号的当前噪声频谱，其中使用由所述第二声音接收的所述音频信号来估计所述当前噪声频谱 传感器; 使用由第一声传感器接收的音频信号与当前噪声谱之间的时间平均电平差确定惩罚噪声谱; 通过从当前噪声谱减去惩罚性噪声谱确定最终噪声估计; 以及使用所述最终噪声估计对所述第一声学传感器接收的所述音频信号应用第二降噪算法; 并输出具有降低的背景噪声的音频流。