Method for improving IP phone echo

Abstract

The invention discloses a method for improving IP phone echo. At least one audio channel is contained in the method, wherein each audio channel comprises a recording thread, a receiving thread and a playing thread; the recording thread performs audio processing on microphone sound acquired each time through an echo cancellation module and transmits the processed audio data to the opposite side; the echo cancellation module contains a multiband-based echo delay determination method, a least mean square self-adaptive filtering method based on free step length, a single side band nonlinear filterbased on a multiphase structure, a comfort noise generator and a double-talk detection algorithm; and the receiving thread processes audio data sent by the opposite side and then sends the audio datato a buffer zone, and the playing thread processes the audio data in the buffer zone and plays the processed audio data. The method has the benefits as follows: the voice call quality is improved byreducing the echo phenomenon of an IP phone in a call, the internet phone practicability can be improved, the application range of the internet phone is enlarged, and the enterprise cost is reduced.

Description

Technical field [0001] The present invention relates to the technical field of digital voice processing, in particular to a method for improving the echo of IP telephones. Background technique [0002] IP telephony is a telephone communication technology that enables calls through the Internet. Compared with traditional fixed-line phones, IP telephony has many advantages such as low call costs, simple construction, and easy scalability. However, when using an IP phone to make a call, it is easily affected by the network or line, and sound quality problems such as echo occur, which affect the call quality. [0003] The existing methods to eliminate echo mainly include the following: (1) Improvement of the voice environment, such as adding sound-absorbing materials on the wall, by reducing the reflection of speaker sound, indirect acoustic echo can be suppressed, but the effect on direct echo is not great. (2) Use an echo suppressor to compare the received sound with the microphone ...

AI Technical Summary

Problems solved by technology

[0004] In addition, in the existing technical solutions, if the network environment is not good, the echo cancellation is not obvious and the original sound is greatly distorted when a single party, especially a multi-party call is made.

Images