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Method for eliminating echo from multi-party call

An echo cancellation, multi-party call technology, applied in the direction of the two-way sound reinforcement telephone system, etc., can solve the problems of echo interference of multi-party calls, and achieve the effect of simple performance

Inactive Publication Date: 2015-06-24
黄文明
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is the problem of echo interference in multi-party conversations in the prior art, and a new method for echo cancellation in multi-party conversations is provided

Method used

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  • Method for eliminating echo from multi-party call
  • Method for eliminating echo from multi-party call
  • Method for eliminating echo from multi-party call

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] refer to figure 1 The method described is specific to an embodiment of a two-channel stereo audio system, which is applied to a video conferencing system. In this system, a microphone MIC1 and two speakers SPK1-L and SPK1-R are placed in the far end room, with the participants as the center, SPK1-L is placed on the left, and SPK1-R is placed on the right. distance. MIC1 is correspondingly placed within a range not far from the speaker, and is used to collect the audio signal of the participant speaking. Similarly, place a microphone MIC2 and two speakers SPK2-L and SPK2-R in the near-end room, centering on the participants, place SPK2-L on the left and SPK2-R on the right at the same distance, Corresponding SPK2-L and SPK2-R restore the signal of MIC1 in the distal chamber.

[0054] Accepting references from remote rooms figure 2 After processing the voice signals of multiple participants, while restoring the sound through the near-end SPK2-L and SPK2-R, the near-e...

Embodiment 2

[0057] With [embodiment 1], just adopt 4 microphones MIC to collect voice signal, refer to Image 6 The method shown is converted into a dual-channel stereo signal. The signals collected by 4 microphones need to be processed by 4*2 head-related transfer function HRTF, and then linearly superimposed to synthesize a dual-channel stereo signal and fed to the left and right speakers for playback.

[0058] Using the echo cancellation system of the present invention, the test of 200M audio data shows that not only can effectively eliminate multi-channel echo interference, but also the calculation speed of the FFT part of the echo cancellation algorithm executed by the GPU is about 5.5 times faster than that of the FFT part of the echo cancellation algorithm executed by the CPU times, greatly improving the overall performance of the system.

Embodiment 3

[0060] Same as [Example 1], except that 2 microphones MIC and 2 speakers SPK are set in each independent space. When collecting signals with 2 microphones MIC, 4 pairs of head-related transfer function HRTF are required for processing, and the echo cancellation system requires 4 groups of MDF filters detector and residual echo and background noise post-processing modules form a system.

[0061] Using the echo cancellation system of the present invention, the test of 100M audio data shows that not only can effectively eliminate the multi-channel echo interference, but also the calculation speed of the FFT part of the echo cancellation algorithm executed by the GPU is about 4 times faster than that of the FFT part of the echo cancellation algorithm executed by the CPU times, greatly improving the overall performance of the system.

[0062] By analogy, if there are N microphones MIC and 2 speakers SPK, then there must be N output signals after processing by this system. Since the...

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Abstract

The invention relates to a method for eliminating an echo from a multi-party call. The invention mainly solves the problem of echo interference in the multi-party call in the prior art. The method comprises the following steps: 1, obtaining a multipath voice signal by adopting equipment capable of accepting a voice or sound signal at a sending end and encoding through an encoder; 2, after packing an encoded voice data flow, sending to a receiving end through a network; 3, decoding the voice data at the receiving end and processing on the basis of a head related transfer function, and then superposing and combining into a double-channel voice signal; 4, performing echo eliminating treatment on the combined double-channel voice signal through an echo eliminating system; and 5, adopting at least two devices with a voice or sound playing function for outputting the treated double-channel voice signal. According to the technical scheme, the echo eliminating system comprises a preprocessing module, a voice detecting module, an adaptive filtering module and a residual echo and background noise post-processing module. The problem is more effectively solved according to the technical scheme. The method can be applied to a video conference system.

Description

technical field [0001] The invention relates to a method for eliminating echo in multi-party conversation. Background technique [0002] A video conferencing system refers to a system in which two or more people or groups in different places transmit sound, video files and document materials to each other through transmission lines and multimedia equipment to achieve instant and interactive communication to complete the purpose of the meeting. The video conferencing system solves the problem of long-distance communication, saves costs and improves work efficiency, and has been recognized by more and more organizations and individual users. With the rapid development of Internet technology and voice technology, video conferencing system has become the mainstream remote remote communication method for geographically dispersed users (government agencies, multinational groups, enterprises, individuals, etc.). [0003] In recent years, with the development of communication techn...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04M9/08
Inventor 于洋林国夫张伟
Owner 黄文明