Digital filter

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专利汇可以提供Digital filter专利检索,专利查询,专利分析的服务。并且PURPOSE: To execute echo identification without fail by using an infinite impulse response type digital filter and an (n)-th finite impulse response type digital filter as a means to prepare a pseudo-echo from an input signal to an echo canceller.
CONSTITUTION: A signal S to be same as the input signal is obtained as the input of an FIR type ADF and an output from this filter is inputted to a circuit composed of a unit delay element Z
-1 . Then, an M signals where delay from 0 to (M-1)T is given are obtained. Next, this signal is inputted to multipliers K
0 -KM
+1 and a coefficient is controlled according to an adaptive algorithm. Then, the part from 0 to (M-1)T is identified out of the impulse response of an echo route and erased. Further, a signal S' where the delay of an MT is given by the FIR type ADF part is inputted to an IIR type ADF in a rear step and the part after the MT is identified and erased. Thus, a pseudo-echo HX obtained from the outputs of the FIR type and IR type ADFs.
COPYRIGHT: (C)1989,JPO&Japio,下面是Digital filter专利的具体信息内容。

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