System for deemphasizing and separating amplitude modulation components from a signal

Claim 1

A RECEIVER FOR USE IN A STEROPHONIC SOUND TRANSMISSION SYSTEM IN WHICH THE TRANSMITTED INTELLIGENCE IS COMPRISED OF A PREEMPHASIZED L+R SIGNAL ALLOCATED TO THE PORTION OF THE SPECTRUM BELOW A PREDETERMINED FREQUENCY AND AMPLITUDE MODULATION SIDEBANDS OF A CARRIER WAVE REPRESENTING A PREEMPHASIZED L-R SIGNALS THE SIDEBANDS BEING ALLOCATED TO A DIFFERENT PORTION OF THE SPECTRUM, THE COMBINATION OF A SOURCE OF THE L+R SIGNALS AND THE SIDEBANDS REPRESENTING THE PREEMPHASIZED L-R SIGNALS, A DEEMPHASIZING CIRCUIT COUPLED TO SAID SOURCE, SAID DEEMPHASIZING CIRCUIT HAVING A TRANSFER CHARACTERISTIC THAT FALLS OFF AS THE FREQUENCY INCREASES, SAID TRANSFER CHARACTERISTICS BEING SUCH AS TO OFFSET THE PREEMPHASIS OF SAID L+R SIGNAL AND TO PREVENT L-R SIDEBANDS FROM PASSING THROUGH SAID DEEMPHASIZING CIRCUIT, AN AMPLITUDE MODULATION DETECTION MEANS HAVING AN INPUT AND AN OUTPUT, MEANS FOR COUPLING SAID SOURCE TO SAID INPUT OF SAID AMPLITUDE MODULATION DETECTION MEANS, SAID COUPLING MEANS HAVING A TRANSFER CHARACTERISTIC WHICH IS A MAXIMUM AT THE FREQUENCY OF SAID CARRIER WAVE AND WHICH FALLS OFF ON EITHER SIDE IN SUCH MANNER SO AS TO OFFSET THE PREEMPHASIS OF SAID L-R SIDEBANDS SO THAT THE AMPLITUDE MODULATION DETECTION MEANS PRODUCES AN L-R SIGNAL IN ITS ORIGINAL FORM, AND MATRIXING MEANS COUPLED TO SAID DEEMPHASIZING CIRCUIT AND SAID OUTPUT OF SAID AMPLITUDE MODULATION DETECTION MEANS, SAID MATRIXING MEANS BEING SUCH AS TO COMBINE THE L+R AND L-R SIGNALS SO AS TO PRODUCE SEGREGATED L AND R SIGNALS.