AUDIO APPARATUS AND ITS REPRODUCTION PROGRAM

摘要

An input signal X of a first channel is divided by a multi-stage delay processor (Z-1) and each of the outputs is superimposed by a predetermined coefficient by a coefficient processor (W0, W1, ..., Wk). The results are added by an adder Sigma, thereby providing a non-correlating filter for extracting a signal component from the input signal X of the first channel having a high correlation with an input signal Y of a second channel. There is provided a coefficient updating processor (5) for successively changing the feature of the non-correlating filter according to an error signal e obtained from the output signal RES and the input signal Y from the second channel, and the input signal X of the first channel. A surround signal is obtained from a difference between the output RES from the non-correlating filter and the input signal Y of the second channel. Thus, upon reproduction of a two-channel stereo signal, it is possible to generate a surround signal not giving uncomfortable feeling to a listener.