Method for realizing echo counteraction
An echo cancellation and echo technology, which is used in echo reduction, telephone communication, automatic switching offices, etc., can solve the problems of reducing the resource utilization rate of echo cancellers, large echo cancellation time, and prolonging convergence time, so as to improve the Effects of voice quality, faster convergence, and improved convergence speed
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[0019] The present invention will be described in further detail below in conjunction with the accompanying drawings.
[0020] first reference figure 2 . figure 2 is the schematic diagram of echo path delay. figure 2 , the echo path delay is t d Indicates that it consists of two parts: pure delay (the transmission delay of the echo path) and diffuse delay (the duration of the echo signal). where the pure delay is given by t r Indicates that the scattering delay is given by t d -t r express. Generally speaking, the scattering delay is relatively fixed and generally does not exceed 10ms. The pure delay is related to the transmission distance between the echo canceller and the switch equipped with the 2-4 line converter that generates the echo and the network topology (how many switches are passed through in the middle). Therefore, the pure echo delays of different calls are different, which leads to great differences in the echo path delays of different calls. For ex...
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