Microphone signal delay compensation control method based on echo cancellation

Abstract

The invention provides a microphone signal delay compensation control method based on echo cancellation. The method comprises the following steps: after conducting short-time data analysis on a microphone signal and a loudspeaker signal, relatively accurately calculating the time difference between the two signals, and then performing expansion and alignment operations on a buffering area to realize no time delay between the two digital signal sources. The microphone signal delay compensation control method based on echo cancellation effectively solves the problem that due to time delay between the microphone signal and the loudspeaker signal in a non-real-time system such as an Android system, an acoustic echo cancellation module cannot be used normally; and on the premise of not performing any bottom-driver modification on a system platform, the problem of time delay between the microphone signal and the loudspeaker signal is simply and effectively solved, so that the echo cancellation function can complete the same technical effect on an application software layer under Android as the way that the echo cancellation function is directly added to a bottom driver.

Description

technical field [0001] The invention relates to the technical field of echo cancellation, in particular to an echo cancellation-based microphone signal delay compensation control method. Background technique [0002] The echo is caused by the acoustic loop between the speaker and the microphone. The sound signal from the far end, through the communication connection, arrives at the near end and is released through the speaker at the near end, and then is collected by the microphone and transmitted back to the far end. At this time, the person talking at the far end can hear his own echo, which seriously affects the call quality. [0003] Since the acoustic loop from the loudspeaker to the microphone is unknown and time-varying, adaptive filtering methods are widely used in echo cancellation solutions commonly used in the prior art. For example, the Chinese patent application with the application number: 200610058449.9 and the invention name "A Microphone Echo Cancellation ...

AI Technical Summary

Problems solved by technology

In the design of the Android system software architecture, the audio driver and architecture have produced more data delays, and even compared to the delay of the sound card of the PC computer, the delay is low enough and stable.

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