Dimagic Co., Ltd.

Noriyuki Hanawa

Toshio Saito

Hareo Hamada

Kazuhiro Kawana

The input signal X of one channel is divided by a multi-stage delay processing device Zand each of the outputs is superimposed by a specified coefficient by a coefficient processing device W, W, . . . , W. The results are added by an adder, thereby providing a correlation eliminating filter for extracting a signal component from the input signal X of one channel having a high correlation with the input signal Y of the other channel. There is provided a coefficient updating processing devicefor successively changing the feature of the correlation eliminating filter according to an error signal e obtained from the output signal RES and the input signal Y from the other channel, and the input signal X of one channel. A surround signal is obtained from a difference between the output RES from the correlation eliminating filter and the input signal Y of the other channel. Thus, upon reproduction of a two channels stereo signal, it is possible to generate a surround signal not giving uncomfortable feeling to a listener.

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Foster City, CA, United States of America

Noriyuki Hanawa