Echo elimination device, communication terminal and method for confirming echo delay time

Abstract

The invention discloses an echo eliminating device, comprising: an acoustic echo eliminator which receives an echo time-delay value and determine parameters according to the echo time-delay value to eliminate the echo; a downlink voice detecting module which detects whether energy of a received downlink voice signal reaches the prearranged threshold value, if so, an identifier is output; a time-delay computing module which collects the uplink, downlink voice signals, computes correlative coefficient of the uplink, downlink voice signals at the time of receiving the identifier, determines the echo time-delay value corresponding to the maximum value of the correlative coefficient, and sends the echo time-delay value to the acoustic echo eliminator. The invention not only can configure appropriate parameters for terminal by the time of leaving factory, but also can be integrated to update relevant parameters in real time for a part of the acoustic echo eliminator, thereby the invention is apt for variation of the echo time-delay owing to change of the terminal's circumstance and improves effect of echo elimination as well as reduces expenditure of system resource. Meanwhile, the invention also discloses a communication terminal including the echo eliminating device, and a method for determining the echo time-dealy.

Description

technical field [0001] The invention relates to the technical field of acoustic echo cancellation, in particular to an echo cancellation device, a communication terminal and a method for determining echo time delay. Background technique [0002] Acoustic echo means that the sound played by the speaker is picked up by the microphone and sent back to the remote end, so that the remote user can hear their own voice. For example, when using a personal computer (Personal Computer, PC) to make a voice call, since the voice signal has to undergo a series of processing such as encoding, compression, and packaging, the echo problem is relatively prominent. In digital wireless applications, due to the non-linearity of speech compression technology and speech compression algorithm, a long processing delay time (round-trip delay greater than 200 milliseconds) is introduced, which makes the acoustic echo problem more obvious. For example, due to the unreasonable structure of the mobile ...

AI Technical Summary

Problems solved by technology

[0009]This purely artificial estimation method is not only troublesome, but also has a large estimation error. The error generally reaches tens of milliseconds. At this time, AEC has to adopt some very conservative parameters, such as increasing the order of the filter. In this way, not only the system overhead is multiplied, but also the effect of echo cancellation is seriously affected.

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