Abstract: A stereo processing system which comprises a left channel and a right channel; a filter in each of the channels for separating an audio signal into a plurality of bands; a phase-shift/delay circuit in each of the channels for receiving a portion of the output of the corresponding filter and phase-shifting and delaying the received signal for each of the separated bands; a pair of input/output circuits interconnecting the left channel and the right channel for exchanging the signals between the two phase-shift/delay circuits for mixing the signal received from the filter of the left channel with the signal received from the phase-shift/delay circuit of the right channel in the phase-shift/delay circuit of the left channel and vice versa; a mixing circuit in each of the channels for mixing the signal received from the output of the corresponding filter with the output of the corresponding phase-shift/delay circuit; and a phase detector/delay circuit coupled to the outputs of the mixing circuits of the left and