Stereophonic detector and matrixing circuit

Claim 1

A CIRCUIT FOR DEMODULATING A COMPLEX WAVE WHICH IS MODULATED IN AMPLITUDE AS A FUNCTION OF THE SUM OF TWO INFORMATION SIGNALS AND IS ANGULARLY MODULATED AS A FUNCTION OF THE DIFFERENCE OF SAID TWO INFORMATION SIGNALS, SAID CIRCUIT COMPRISING MEANS RESPONSIVE TO SAID COMPLEX WAVE FOR GENERATING FIRST AND SECOND DETECTED SIGNALS, SAID FIRST AND SECOND DETECTED SIGNALS VARYING IN AMPLITUDE IN THE SAME SENSE IN REPONSE TO THE AMPLITUDE MODULATION COMPONENT OF SAID COMPLEX WAVE AND VARYING IN AMPLITUDE IN THE OPPOSITE SENSE IN RESPONSE TO THE ANGULAR MODULATION OF SAID COMPLEX WAVE, MEANS FOR GENERATING A THIRD SIGNAL WHICH IS PROPORTIONAL TO THE AMPLITUDE VARIATIONS OF SAID FIRST AND SECOND DETECTED SIGNALS WHICH ARE IN THE SAME SENSE, MEANS FOR GENERATING A FOURTH SIGNAL WHICH IS PROPORTIONAL TO THE INSTANTANEOUS DIFFERENCE OF SAID FIRST AND SECOND DETECTED SIGNALS, INTEGRATING MEANS RESPONSIVE PRINCIPALLY TO SAID FOURTH SIGNAL FOR PROVIDING A FIFTH SIGNAL REPRESENTATIVE OF THE TIME INTEGRAL OF SAID FOURTH SIGNAL, MEANS FOR GENERATING A SIXTH SIGNAL WHICH IS THE INVERSE OF SAID FIFTH SIGNAL, MEANS FOR COMBINING SAID THIRD SIGNAL AND SAID FIFTH SIGNAL TO PROVIDE A FIRST OUTPUT SIGNAL REPRESENTATIVE PRINCIPALLY OF A FIRST ONE OF SAID INFORMATION SIGNALS, AND MEANS FOR COMBINING SAID THIRD AND SAID SIXTH SIGNALS TO PROVIDE A SECOND OUTPUT SIGNAL REPRESENTATIVE PRINCIPALLY OF SAID SECOND INFORMATION SIGNAL.