Patent ID: 8041027

Claim:
An electricity echo cancellation device, wherein the electricity echo cancellation device is deployed in a terminal, comprising a network echo delay computation module, an input buffer memory module and an adaptive filtering module, wherein: the network echo delay computation module is configured to calculate a network echo delay according to a Real Time Control Protocol (RTCP) packet transmitted from the network; the input buffer memory module is configured to receive and save a terminal input signal, determine a terminal input signal to be adaptively filtered according to the network echo delay most recently outputted from the network echo delay computation module and the terminal input signal received and saved by the input buffer memory module, and output the terminal input signal to be adaptively filtered to the adaptive filtering module; and the adaptive filtering module is configured to calculate an electricity echo signal according to the terminal input signal to be adaptively filtered, output by the input buffer memory module, and the current filtering coefficient maintained in the adaptive filtering module, subtract the electricity echo signal from a network input signal from the network and output a network output signal derived through the subtraction to the outside.