Method and its system for eliminating stereophonic echo based on voice signal separate model

Abstract

This invention provides a system for eliminating echo of stereos based on the separation of phone signals including an echo eliminator, a microphone and a loudspeaker, in which, said eliminator includes a periodic power detection module, a pulse response difference measurement module, a phone signal separation module, an intercommunication test module, an echo path estimation module and an adder. A method includes: estimating or renovating difference of near end room pulse response and echo path pulse response to separate single-path echo from multi-path echo when there is no intercommunication, getting the estimation of the echo path pulse response to further get the estimation of the separated single-path echo combining the source signal from a far end room, the single-path echo left from the separation of the received signal of a near end room microphone subtracts the corresponding estimation value so as to eliminate echos.

Description

technical field [0001] The invention relates to an echo cancellation technology in a closed speech environment, in particular to a stereo echo cancellation method and system based on a speech signal separation model. Background technique [0002] With the development of multimedia communication technology, video teleconferencing and vehicle-mounted hands-free wireless telephone systems have become increasingly popular. In such a closed voice environment composed of speakers, rooms and microphones, there are acoustic echoes that affect the normal progress of communication, so it is necessary to set up an echo canceller to reduce the interference of echoes. With the improvement of people's requirements for fidelity, in order to enhance the immersive feeling of the participants, it is essential to use stereo sound. However, due to the increase in the number of speakers and microphones, the resulting multi-channel echo cancellation question. Compared wit...

AI Technical Summary

Problems solved by technology

With the improvement of people's requirements for fidelity, in order to enhance the immersive feeling of the participants, it is essential to use stereo sound. However, due to the increase in the number of speakers and microphones, the resulting multi-channel echo cancellation question

Compared with the single-channel echo cancellation, the multi-channel echo cancellation represented by the stereo situation exists because of the strong correlation between the input signals. The solution of the echo canceller is not unique, and the offset is large, that is, the near-end cannot be uniquely identified. The impulse response of the room is inherently problematic and does not meet the application requirements well

Many of the existing echo cancellation patent technologies are aimed at single-channel echo cancellation. The use of traditional adaptive filters has achieved relatively good results, but the traditional method of directly extending the single-channel situation to multiple channels cannot meet the requirements. actual application needs

The Chinese invention patent application with the application number 200610034214.6 discloses a "multi-channel echo cancellation system based on SIMO channel blind identification", which is a technology for multi-channel echo cancellation. The separation technology is applied to the multi-channel echo cancellation model; however, this technology is difficult to overcome the defects of the huge amount of calculation and the slow operation speed of the blind signal separation technology itself, and the initial construction matrix and subsequent construction matrix that need to be used in this technology Both occupy a large storage space and will also lead to high hardware costs

Images