G - Physics – 10 – K
Patent
G - Physics
10
K
G10K 11/16 (2006.01) H04M 9/08 (2006.01)
Patent
CA 2234738
The present invention relates to a method and apparatus for cancelling an echo in a system, in order to improve the quality of sound significantly. Switch (141) continuously switches between received signal and a supplemental signal, which is obtained by processing the received signal (2) through filter (145). Accordingly, adaptive filters (122) and (124) operate sometimes by using received signal (2) as the input signal and sometimes by using the supplemental signal as the input signal, so that it is possible to obtain adaptive filter coefficients by using twice the number of conditional equations as the case of using only received signal (2) as the input signal. As the adaptive filter coefficients do not become indefinite, it is possible to converge the coefficients to the correct values. Further, by making the switching period between the original and the supplemental signals to be longer than the sampling period of the received signal, it is possible to suppress aliasing distortion of the received signal directly supplied to a speaker and to maintain better sound quality.
Corporation Nec
G. Ronald Bell & Associates
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