Echo processing method for meeting TV system

A processing method and conference TV technology, which is applied in the direction of video conference system, two-way working system, voice analysis, etc., can solve the problems of echo cancellation that cannot be heard in the venue, and the loud echo can be heard in the speaking venue, so as to achieve the effect of improving the effect

Inactive Publication Date: 2009-08-05
深圳市迪威新软件技术有限公司
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AI Technical Summary

Problems solved by technology

[0005] The reason is that the traditional echo cancellation algorithm cannot completely cancel the echo of the venue when the sound input level signal is too large, resulting in a large echo that can be heard in the speaking venue.

Method used

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  • Echo processing method for meeting TV system
  • Echo processing method for meeting TV system
  • Echo processing method for meeting TV system

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Embodiment Construction

[0023] This solution uses a software method to determine the current state of the venue, and achieves the ideal echo cancellation effect by pre-processing the audio sample data and post-processing the output of the echo cancellation module. Such as figure 1 As shown, its A / D represents the analog-to-digital conversion module of audio sample data.

[0024] In this embodiment, the status of the venue is divided into the following three types, and the current status of the venue is determined by software and corresponding processing is performed.

[0025] (1) State 1: Mute state

[0026] When the absolute value of all audio sample data in the conference venue during the continuous time t1 is less than M1, we consider the conference venue to be in a silent state. This state is usually the situation where the microphone is turned off or the microphone is turned on but there is no speech and the echo is very low. In this state, we post-process the output of the echo cancellation module...

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Abstract

This invention puts forward a method for processing echoes of conference TV system including: A, judging states according to audio sample data and converting them to related state, B, processing the audio according to a process method set in advance for related states, which judges the current state of a meeting place, pre-processes the audio sample data and post-processes the output of the echo cancel module to cancel echoes ideally.

Description

Technical field [0001] The invention relates to an echo processing method of a video conference system, in particular to the improvement of the echo cancellation effect of a video conference system based on broadcasting. Background technique [0002] At present, most of the applications of video conferencing systems are mainly based on broadcasting. Specifically speaking, one venue will speak and other venues will listen. In this kind of system, echo cancellation is a more complicated problem, which is affected by many factors, such as the performance of the echo cancellation algorithm, the acoustic characteristics of the venue, and so on. The following problems were found in specific applications: [0003] 1. Part of the echo can still be heard in the speaking venue when the microphone is turned off in the listening venue. [0004] 2. When the microphone of the listening site is turned on but no speech is made, a loud echo is heard in the speaking site. [0005] The reason is th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G10L21/02H04N7/15
Inventor 陈伟唐庶
Owner 深圳市迪威新软件技术有限公司
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