Apparatus and method for processing a multichannel audio signal
An audio signal and multi-channel technology, applied in the use of detectable carrier information, voice analysis, information storage, etc., can solve problems such as stereo image distortion, sound quality reduction, and stereo information loss
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[0099] figure 2 A block diagram of an embodiment of the inventive method is shown in , for the example of an input signal having two channels (eg left and right channels of stereo sound).
[0100] The input audio signal is x=[x 1 x 2 ] T , where x 1 Indicates the first channel signal, x 2 Indicates the second channel signal. In step STFT, for x 1 and x 2 Compute the short-time Fourier transform (STFT) representation, resulting in X 1 and x 2 .
[0101] According to the invention, in a step named MS, the channel signal (here the transformed channel signal X of the multi-channel audio signal is obtained according to the following formula 1 and x 2 ) to calculate and signal X s sum and difference signal X d :
[0102] x s =(X 1 +X 2 ), (6)
[0103] x d =(X 1 -X 2 ) (7)
[0104] In a different embodiment, the order of STFT and signal combination in step MS is swapped. This takes into account that calculating the sum and difference signals can also be perfor...
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