Stereophonic sound receiver system

Claim 1

APPARATUS FOR THE TRANSLATION OF A CARRIER WAVE ANGLE MODULATED BY A FIRST SIGNAL AND AMPLITUDE MODULATED BY A SECOND SIGNAL STEREOPHONICALLY RELATED TO SAID FIRST SIGNAL INTO STEREOPHONICALLY RELATED AUDIO SIGNALS BEARING THE SAME RELATIVE AMPLITUDE RELATIONSHIP AS THE MODULATING SIGNALS DESPITE VARIATIONS IN CARRIER WAVE AMPLITUDE OCCURING AT A RATE BELOW THE LOWEST SIGNAL FREQUENCY, INCLUDING A COMMON PROCESSING CHANNEL FOR THE CARRIER WAVE AND THE ANGLE AND AMPLITUDE MODULATED SIDE BANDS, AN ENVELOPE DETECTOR COUPLED TO THE COMMON CHANNEL FOR RECOVERING THE AMPLITUDE MODULATING SIGNAL, AN ANGLE VARIATION DETECTOR COUPLED TO THE COMMON CHANNEL FOR RECOVERING THE ANGLE MODULATING SIGNAL, THE OUTPUT SIGNAL LEVEL OF SAID LAST-NAMED DETECTOR BEING A FUNCTION OF BOTH THE AMPLITUDE AND ANGLE OF THE WAVE IMPRESSED UPON ITS INPUT, A DYNAMIC LIMITER CIRCUIT INCLUDING A UNILATERAL CONDUCTING DEVICE AND A TIME CONSTANT NETWORK FOR BIASING THE DEVICE, THE TIME CONSTANT OF THE NETWORK BEING LONGER THAN THE PERIOD FOR THE LOWEST SIGNAL FREQUENCY, AND MEANS INTERPOSING THE SAID LIMITER CIRCUIT IN THE COUPLING PATH BETWEEN THE COMMON CHANNEL AND THE ANGLE VARIATION DETECTOR TO SET UP A FLOW OF CURRENT THROUGH THE DEVICE AND TO DEVELOP A BIASING POTENTIAL ACROSS THE NETWORK, SAID LAST-NAMED MEANS INCLUDING AN IMPEDANCE ELEMENT.