Optimized Processing For Reducing Channels Of A Stereophonic Audio Signal

Abstract: The invention relates to a processing method for reducing channels of a stereophonic signal to obtain a monophonic signal, comprising, for a current frame: - a first step of selection (305) of a channel-reducing processing operation between two methods using filtering of the stereophonic signal and re-phasing of the signals, the selection being carried out according to a phase indicator (302), representative of a measurement of the degree of phase opposition between the frequency components of the channels of the stereo signal, - a second step of selection (307) between one of the two methods, selected at the end of the first selection step and a processing method for reducing channels without re-phasing, the selection being carried out according to the value of an energy ratio (306) between the channels of the stereo signal. The invention also relates to a processing device for reducing channels implementing the method.

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