Stereo processing system

A stereo processing system having a first channel circuit and a second channel circuit, which comprises:

• (a) a first filter coupled to said first channel circuit for separating an audio signal input to said first channel circuit into a plurality of bands, said first filter having a first output for outputting a first portion of an output signal thereof and a second output for outputting a remaining portion of the output signal thereof;
• (b) a second filter coupled to said second channel circuit for separating an audio signal input to said second channel circuit into a plurality of bands, said second filter having a first output from outputting a first portion of an output signal thereof and a second output for outputting a remaining portion of the output signal thereof;
• (c) a first phase-shift/delay circuit coupled to said first channel circuit for receiving the first portion of the output signal of said first filter from the first output thereof and phase-shifting and delaying the received signal for each of the bands separated by said first filter;
• (d) a second phase-shift/delay circuit coupled to said second channel circuit for receiving the first portion of the output signal of said second filter from the first output thereof and phase-shifting and delaying the received signal for each of the bands separated by said second filter;
• (e) a pair of input/output circuits interconnecting said first phase-shift/delay circuit and said second phase-shift/delay circuit for inputting a signal from said second phase-shift/delay circuit to said first phase-shift/delay circuit and inputting a signal from said first phase-shift/delay circuit to said second phase-shift/delay circuit for mixing a signal received from said first filter with the signal received from said second phase-shift/delay circuit in said first phase-shift/delay circuit and for mixing a signal received from said second filter with the signal received from said first phase-shift/delay circuit in said second phase-shift/delay circuit, respectively;
• (f) a first mixing circuit coupled to said first channel circuit so as to mix a signal received from the second output of said first filter with an output signal of said first phase-shift/delay circuit;
• (g) a second mixing circuit coupled to said second channel circuit so as to mix a signal received from the second output of said second filter with an output signal of said second phase-shift/delay circuit;
• and
• (h) a phase detector-delay circuit coupled to the output of said first mixing circuit and the output of said second mixing circuit for detecting and delaying a portion of the output signal from said first mixing circuit having a 180.degree. phase-shift with respect to the output signal from said second mixing circuit and a portion of the output signal from said second mixing circuit having a 180.degree. phase-shift with respect to the output signal received from said first mixing circuit, respectively.