Echo elimination device, communication terminal and method for confirming echo delay time
A technology of echo cancellation and acoustic echo cancellation, applied in the direction of selection device, sidetone cancellation circuit, telephone structure, etc., can solve the problems of large estimation error, cumbersome estimation method, increase of system overhead, etc., and achieve the effect of avoiding errors
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[0031] The key of the present invention is to first determine that the communication terminal has received a certain amount of downlink voice signals, and then calculate the correlation coefficient between the uplink and downlink voice signals, so as to select the time delay corresponding to the maximum value of the correlation coefficient as the final echo time. Extension.
[0032] The embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0033] See figure 1 , Is a schematic diagram of an echo cancellation device according to an embodiment of the present invention. The echo cancellation device exists in a communication terminal, such as a mobile phone, a Personal Digital Assistant (PDA) with a call function, or a PC with a call function. figure 1 Only the structure of the echo cancellation part is given, and there is no restriction on the remaining components of the communication terminal where it is located.
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