| 摘要 |
PROBLEM TO BE SOLVED: To reduce the amount of computation performed a by pseudo echo generating filter. SOLUTION: An adaptive filter 106a computes a linear prediction residual vectorε(t) which is a finite number of non-zero sound source pulse trains with a tap coefficient H(t) to generate a whitened pseudo echo rw(t). An inverse filter 106b whitens a digital transmission audio signal y(t). An adder 106c subtracts the whitened pseudo echo rw(t) from a whitened transmission audio signal yw(t) to obtain a whitened residual signal ew(t). A pseudo echo generating filter 106d computes the linear prediction residual vectorε(t) with the tap coefficient H(t) output from the adaptive filer 106a to generate a whitened pseudo echo rw'(t). A synthesis filter 106e synthesizes the whitened pseudo echo rw'(t) using a linear prediction coefficient L(t) to generate a pseudo echo r(t). An adder 106f subtracts the pseudo echo r(t) from the digital transmission audio signal y(t) to obtain a residual signal e(t). COPYRIGHT: (C)2010,JPO&INPIT
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