The invention discloses a restraining method for residual echo in an echo cancellation system. An adaptive algorithm in the echo cancellation system utilizes input reference signals x (n) and signals d (n) collected by a microphone to adjust and deliver functional weight to be matched with a delivery function h (n) corresponding to an echo path as well as possible to obtain expected responding estimating value y (n) and then to obtain output error signals e (n), and the e (n) includes the residual echo delta (n). The y (n) and the e (n) are converted into frequency domain signals Y (omega) and E (omega) through fourier, and cross-power spectrum density Sye (omega) of the Y (omega) and the E (omega), cross-power spectrum density Syy (omega) of the Y (omega) and cross-power spectrum density See (omega) of the E (omega) are calculated. A filter is processed after calculating the Sye (omega), the Syy (omega) and the See (omega), and the residual echo delta (n) is further eliminated from the e (n). Simultaneously, the post-processing process adopts an overlapping accumulating smooth process for avoiding blocking effects caused by overlarge changing of post-processing filter results. The invention further discloses the equipment for performing the algorithm, and by means of the method and equipment, the residual echo is effectively restrained.

Restraining method for residual echo in echo cancellation system

The invention relates to a stereo echo offset method based on echo spectrum estimation and a speech existence probability. The method comprises the following steps: 1) performing framing, windowing and Fourier transformation on signals y(n) acquired by a microphone to obtain frequency domain signals Y(i, k), and performing the framing, the windowing and the Fourier transformation on received M distal channel signals xm(n) separately and successively to obtain frequency domain signals Xm(i, k); 2) estimating an echo spectrum of the microphone frequency domain signals Y(i, k) which is related to any distal channel frequency domain signal Xm(i, k); 3) calculating a final gain which is based on a Wiener gain and a proximal speech existence probability gain; 4) performing spectrum correction on the microphone frequency domain signals Y(i, k); 5) estimating an echo spectrum of the frequency domain signals after the spectrum correction which is related to any other distal channel frequency domain signal Xm (i, k); 6) calculating the final gain which is based on the Wiener gain and the proximal speech existence probability gain; 7) and performing the spectrum correction on the microphone frequency domain signals after the spectrum correction again according to the final gain obtained in 6).

Stereo echo offset method based on echo spectrum estimation and speech existence probability

A method for processing audio signals is provided comprising outputting an audio signal; receiving the output audio signal via a first receiving path as a first received audio signal; receiving the output audio signal via a second receiving path as a second received audio signal; determining an echo suppression gain based on the first received audio signal and the second received audio signal; and filtering echo suppression of the audio signal based on the first received audio signal and the echo suppression gain.

Methods for processing audio signals and circuit arrangements therefor

A harmonic echo power estimator estimates power of echo generated by harmonic loudspeaker nonlinearities in a user equipment having an echo path between a loudspeaker input and a microphone output. The estimator includes a frequency band mapper that maps each frequency band in a set of loudspeaker output signal frequency bands into a corresponding array of loudspeaker input signal frequency bands, where each frequency band in the set is mapped into several frequency bands in the corresponding array. A power estimator determines a power estimate of each input signal in each array of frequency bands. A power estimate combiner combines determined power estimates in each array of frequency bands into a corresponding estimate of loudspeaker input power generating harmonic loudspeaker nonlinearities. A power estimate transformer transforms the estimates of loudspeaker input power across the echo path into power estimates of the echo generated by the harmonic loudspeaker nonlinearities.

Estimation and suppression of harmonic loudspeaker nonlinearities

Howling suppression method based on feedback signal spectrum estimation

The embodiment of the invention discloses a method and a device for suppressing residual echo, comprising the following steps: receiving a reconstruction voice echo signal y' obtained according to a far-end voice signal, and receiving an input signal e comprising a residual echo signal delta, wherein the input signal e is obtained by counteracting the reconstruction voice echo signal y' from a near-end voice signal d comprising a voice echo signal; transforming signals y', d and e into frequency domain signals Y '(omega), D (omega) and E (omega) through Fourier transform; calculating the power spectrum estimation Sy'y' (omega) of cross-spectral density Sed (omega) and Y'(omega) of D (omega) and E (omega), and calculating the noise signal power spectrum estimation Sww (omega); calculating the power spectrum estimation S delta delta (omega) of a residual echo signal delta according to an echo suppression capacity factor mu and Sy'y'(omega), wherein, mu is a controllable gain which is adjusted according to echo suppression capacity; and filtering the residual echo signal delta from the input signal e according to Sed (omega), Sww (omega) and S delta delta (omega). In another aspect, the invention also discloses relevant equipment. By adopting the method and the device of the invention, residual echo can be effectively filtered.

Method and device for suppressing residual echo

The invention discloses a discrete type active noise-reducing, ventilating and sound-insulating window structure A window body is divided into an inner layer and an outer layer, each layer of the window consists of a casement window and a middle fixed window, and the fixed window can be divided into a plurality of discrete type active noise-control pipelines according to a noise-reducing requirement; a control system comprises a plurality of controllers, a plurality of reference microphones, a plurality of control sources and a plurality of error microphones; and the control sources are arranged in middle interlayer of each discrete type pipeline near to an indoor air vent, the reference microphones are arranged at each discrete type pipeline opening in the window which is near to an outdoor wind inlet, and the error microphones are arranged on a window frame which is near to the indoor air vent The window can obtain 12dBA of newly-increased noise attenuation quantity under 200-800Hz while natural ventilating, so that the afference of the low-frequency noise of wideband can be effectively attenuated Meanwhile, the frequency upper limit can be controlled according to the requirement of the family life, and the number of the discrete type pipelines can be increased, so that the frequency band can be effectively controlled under the condition that the natural ventilation is further improved Various work statuses can be provided to meet the requirements of the family life

Discrete type active noise-reducing, ventilating and sound-insulating window

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Method and device for suppressing residual echo

Discrete type active noise-reducing, ventilating and sound-insulating window