Goertek Inc.

Xiaojie Wu

Bo Li

Shasha Lou

The present invention relates to a method and device for dereverberation of single-channel speech. The method includes the following steps of framing an input single channel speech signal, and processing the frame signals as follows according to a time sequence: performing short-time Fourier transform on a current frame to obtain a power spectrum and a phase spectrum of the current frame; selecting several frames previous to the current frame and having a distance from the current frame within a set duration range, and performing linear superposition on the power spectra of these frames to estimate the power spectrum of a late reflection sound of the current frame; removing the estimated power spectrum of the late reflection sound of the current frame from the power spectrum of the current frame by a spectral subtraction method to obtain the power spectra of a direct sound and an early reflection sound of the current frame; and performing inverse short-time Fourier transform on the power spectra of the direct sound and the early reflection sound of the current frame and the phase spectrum of the current frame together to obtain a signal of the current frame after dereverberation. The dereverberation method and device can solve the problem that the estimation of a transfer function of a reverberation environment or the estimation of reverberation time is difficult in the dereverberation of single-channel speech.

Method and device for dereverberation of single-channel speech

Disclosed in the invention is a method and system for sampling rate mismatch correction of transmitting and receiving terminals, which can obtain a high-precision sampling rate mismatch in real time, carry out sampling rate correction on transmitting and receiving terminal signals, and send the transmitting terminal signal and the receiving terminal signal that have the same sampling rate after corrected to an echo cancellation system to carry out echo cancellation. The present invention can improve the quality of echo cancellation, simplify the computation and reduce the cost. The method for sampling rate mismatch correction of transmitting and receiving terminals provided in the embodiments of the invention comprises: calculating a transfer function of a receiving terminal signal relative to a transmitting terminal signal at each sampling timing according to the transmitting and receiving terminal signals; obtaining a transmission time delay of the transmitting and receiving terminals at each sampling timing using the transfer function; obtaining a sampling rate mismatch of the transmitting and receiving terminals at each sampling timing by means of parameter fitting using the transmission time delay and the linear relationship between the transmission time delay and the sampling rate mismatch; and adjusting the sampling rate of the transmitting terminal signal or the receiving terminal signal at each sampling timing according to the sampling rate mismatch.

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Weifang, China

Xiaojie Wu