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Method for cancelling audio echo

An echo cancellation and audio technology, which is applied in the field of real-time voice transmission, can solve problems such as poor voice quality, short pickup distance, and narrow directivity, and achieve the effects of improving stability and high efficiency, eliminating echo, and improving sound effects

Inactive Publication Date: 2010-09-29
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Treatment of the environment, such as using a gooseneck microphone with narrow directivity and short pickup distance in the meeting room, or using sound-absorbing materials on the inner wall of the room, but only improving the terminal environment cannot completely eliminate the impact of noise
The echo suppressor uses the principle of half-duplex nonlinear noise cancellation to control the microphone and audio signal, and its nonlinear characteristics will cause poor voice quality

Method used

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  • Method for cancelling audio echo
  • Method for cancelling audio echo
  • Method for cancelling audio echo

Examples

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Embodiment Construction

[0018] The invention is an audio echo elimination method suitable for a video conference system or a telephone conference system, which can effectively eliminate echoes in multimedia communication and multimedia conference room applications, and improve sound effects.

[0019] Such as figure 1 As shown, the audio echo cancellation system includes: a core processing module, an analog / digital conversion module, an extended storage module, a clock and reset circuit module, a sound input device, a sound output device, a computer and a power supply. The core processing module, the analog / digital conversion module, the extended storage module, the clock and reset circuit module, the sound input device, the sound output device and the computer are respectively connected to the power supply. The analog / digital conversion module, the extended storage module, the clock and reset circuit module, and the computer are respectively connected with the core processing module. Both the sound ...

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Abstract

The invention discloses a method for cancelling audio echo. A system comprises a core processing module, an analogue / digital conversion module, an extended storing module, a clock and reset circuit module, a voice input device, a voice output device, a computer and a power supply. The method comprises the following steps of: initializing each module and a serial port; then detecting test data; inputting communication audio data; and finally, cancelling the audio echo by the core processing module. The method is suitable for a video conference system or a telephone conference system, and can effectively improve the stability and the high efficiency of the audio echo canceling system, and cancels the echo in a multimedia communication and a multimedia conference room so as to improve the sound effect.

Description

technical field [0001] The invention relates to the technical field of voice real-time transmission, in particular to an audio echo cancellation method. Background technique [0002] With the development of multimedia technology and the popularization of computers, whether it is a modern digital conference room or personal multimedia communication, more and more Internet is used for communication and transmission of information. At present, there is a main restriction factor in the real-time transmission of voice, which is the poor voice quality. There are many factors affecting the voice quality, and one of the most critical factors is the influence of audio echo. The definition of audio echo is that when the far-end voice is emitted by the near-end speaker, the sound waves in the room can be directly transmitted to the microphone or transmitted to the microphone through a series of reflections. When the audio echo is transmitted back from the microphone to the far end, th...

Claims

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Application Information

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IPC IPC(8): H04M9/08
Inventor 刘奇赵问道
Owner ZHEJIANG UNIV