| 摘要 |
The input signal X of one channel is divided by a multi-stage delay processing device Z<SUP>-1 </SUP>and each of the outputs is superimposed by a specified coefficient by a coefficient processing device W<SUB>0</SUB>, W<SUB>1</SUB>, . . . , W<SUB>k</SUB>. The results are added by an adder <img id="custom-character-00001" he="1.78mm" wi="1.02mm" file="US20060013101A1-20060119-P00900.TIF" alt="custom character" img-content="character" img-format="tif"/>, 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 device 5 for 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 othe 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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