Coincident sound recording and matrix encoding techniques represent the sound stage by a set of intermediate signals, which encode the directional information. A passive decoder employs virtual microphone signal mixing to combine these intermediate signals into multiple of signals pointing to various directions corresponding to the surround sound playback speaker configuration. Such passive decoding technique generally suffers from high channel crosstalk, which narrows the reproduced soundstage and creates directional confusion. This paper provides an efficient frequency-domain method to decode the intermediate signals into speaker playback signals with reduced channel crosstalk. Such method can be used, for example, to convert coincident sound recording signals or to decode matrix-encoded stereo signals into multichannel surround sound playback signals. The scheme has been tested and implemented on embedded platform, giving enhanced surround sound playback experience on standard ITU 5.0 surround sound playback setup.
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