公开(公告)号：US10269368B2

公开(公告)日：2019-04-23

申请号：US15608224

申请日：2017-05-30

Applicant: Oticon A/S

Inventor： Jesper Jensen ,  Ulrik Kjems ,  Andreas Thelander Bertelsen ,  Michael Syskind Pedersen

IPC: G10L15/20 ,  G10L21/0232 ,  H04R1/10 ,  G10L21/0264 ,  H04R25/00 ,  G10L21/0216 ,  A61F11/06 ,  H04B1/3827 ,  H04M1/60

Abstract: An audio processing device comprises a) at least one input unit for providing time-frequency representation Y(k,n) of an electric input signal representing sound consisting of target speech and noise signal components, where k and n are frequency band and time frame indices, respectively, b) a noise detection and/or reduction system configured to b1) determine an a posteriori signal to noise ratio estimate γ(k,n) of said electric input signal, and to b2) determine an a priori target signal to noise signal ratio estimate ζ(k,n) of said electric input signal from said a posteriori signal to noise ratio estimate γ(k,n) based on a recursive decision directed algorithm. The application further relates to a method of of estimating an a priori signal to noise ratio. The invention may e.g. be used for the hearing aids, headsets, ear phones, active ear protection systems, handsfree telephone systems, mobile telephones, etc.

公开(公告)号：US09224393B2

公开(公告)日：2015-12-29

申请号：US13967055

申请日：2013-08-14

Applicant: OTICON A/S ,  Retune DSP ApS

Inventor： Ulrik Kjems ,  Jesper Jensen

IPC: G10L21/0208 ,  G10L15/20 ,  H04R3/00 ,  G10L21/0232 ,  H04M9/08 ,  G10L21/0216 ,  H04R1/10 ,  H04R3/02

CPC classification number: G10L15/20 ,  G10L21/0232 ,  G10L2021/02166 ,  H04M9/082 ,  H04R1/1083 ,  H04R3/005 ,  H04R3/02 ,  H04R2225/43 ,  H04R2227/009

Abstract: A method comprises processing M subband communication signals and N target-cancelled signals in each subband with a set of beamformer coefficients to obtain an inverse target-cancelled covariance matrix of order N in each band; using a target absence signal to obtain an initial estimate of the noise power in a beamformer output signal averaged over recent frames with target absence in each subband; multiplying the initial noise estimate with a noise correction factor to obtain a refined estimate of the power of the beamformer output noise signal component in each subband; processing the refined estimate with the magnitude of the beamformer output to obtain a postfilter gain value in each subband; processing the beamformer output signal with the postfilter gain value to obtain a postfilter output signal in each subband; and processing the postfilter output subband signals to obtain an enhanced beamformed output signal.

Abstract translation: 一种方法包括利用一组波束形成器系数来处理每个子带中的M个子带通信信号和N个目标消除信号，以获得每个频带中N阶的逆目标消除协方差矩阵; 使用目标缺失信号来获得在每个子带中目标不存在的最近帧上平均的波束形成器输出信号中的噪声功率的初始估计; 将初始噪声估计与噪声校正因子相乘以获得每个子带中波束形成器输出噪声信号分量的功率的精确估计; 用波束形成器输出的幅度处理精细估计，以获得每个子带中的后置滤波器增益值; 用后置滤波器增益值处理波束形成器输出信号以获得每个子带中的后滤波器输出信号; 以及处理后置滤波器输出子带信号以获得增强的波束形成输出信号。