An Inter-Channel Decorrelation Method for Stereo Acoustic Echo Cancellation
An acoustic echo and stereo technology, which is applied in the fields of stereo acoustic echo cancellation and inter-channel decorrelation, can solve the problems of complex calculation process and high-quality distortion requirements, and achieves a high-energy, low-computation, and high-frequency decorrelation effect. Effect
Active Publication Date: 2019-04-23
INST OF ACOUSTICS CHINESE ACAD OF SCI
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However, for occasions with high requirements for echo cancellation, the current method based on psychoacoustic effects cannot meet the high requirements for sound quality distortion, and the calculation process of this method is relatively complicated.
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[0119] Example 1: The size of the near-end room is 4×3×3m 3 , the two near-end speakers are respectively located at {1,2,1.2}m and {3,2,1.2}m; examine the near-end microphone located at {1.8,1,1.2}m, and the acoustic signal picked up by it Taken as the near-end microphone signal d(n). Gaussian white noise with a signal-to-noise ratio of 30dB is used to simulate the near-end signal. The sampling rate is 16kHz, and the NLMS algorithm is used for adaptive channel identification. The performance of the method of the present invention is compared with the traditional nonlinear transform decorrelation method (NLT).
[0120] The inter-channel coherence coefficient (Inter-Channel CoherenceCoefficient, ICCC) of the two-channel signals x1(n) and x2(n) is defined as:
[0121]
[0122] ICCC takes a value within [0,1], the smaller the value, the weaker the coherence between channels, and the better the decorrelation effect. Such as Figure 4 As shown, among the processing results o...
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The invention provides a stereophonic acoustic echo cancellation inter-channel decorrelation method, which comprises the following steps: 1) picking up acoustic reference signals x1(n) and x2(n) by a far-end microphone, and obtaining frequency spectrum X1(k) and X2(k) through Fourier transform; 2) carrying out high-frequency decorrelation processing on the frequency spectrum X1(k) and X2(k) and obtaining time domain reference signals x1d(n) and x2d(n) obtained after processing; 3) carrying out low-frequency decorrelation processing on the time domain reference signals x1(n) and constructing three sinusoidal signals; 4) adding the three sinusoidal signals to the x1d(n) through time domain addition to obtain x1'(n), x2'(n) being x2d(n); and 5)carrying out adaptive channel identification on the signals x1'(n) and x2'(n) obtained in the step 4) through an adaptive algorithm to realize echo cancellation. The method effectively reduces inter-channel correlation of the stereophonic loudspeaker signals and improves imbalance performance of a stereophonic acoustic echo cancellation system.
Description
technical field [0001] The invention relates to the technical field of acoustic echo cancellation, in particular to an inter-channel decorrelation method for stereo acoustic echo cancellation. Background technique [0002] In hands-free communication systems, acoustic echoes exist due to the closed-loop transmission of acoustic signals. Such problems commonly exist in scenarios such as mobile phone communications, teleconferencing systems, and video conferencing systems. Acoustic echo will reduce the communication quality of the system, so it needs to be eliminated. Generally, an adaptive channel identification algorithm is used (reference [1]: Benesty J, KellermannK et al. A perspective on stereophonic echo cancellation. Berlin, Heidelberg: Springer-Verlag Berlin Heidelberg, 2011: 10.) to achieve echo cancellation. In a stereo communication system, there is a strong inter-channel correlation in the stereo speaker signal in the near-end room, which leads to non-unique conv...
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IPC IPC(8): H04M9/08
Inventor 杨鹤飞郑成诗李晓东彭任华厉剑
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI