Receiver circuit for stereo separation

Claim 1

IN A RECEPTION CIRCUIT HAVING A STEREO DEMODULATOR CIRCUIT FOR DERIVING L AND R STEREO OUTPUT SIGNALS FROM A COMPOSITE SIGNAL COMPRISING AND L+R COMPONENT AND L-R SIDEBANDS, IN WHICH THE L OUTPUT SIGNAL TENDS TO CONTAIN AN UNDEDIRED COMPONENT OF R SIGNAL AND THE R OUTPUT SIGNAL TENDS TO CONTAIN AN UNDESIRED COMPONENTS OF L SIGNAL, AND UNDESIRED COMPONENTS HAVING RELATIVELY GREATER AMPLITUDES OF RELATIVELY HIGHER AUDIO FREQUENCIES MEANS FOR IMPROVING THE STEREO SEPARATION OF SAID L AND R OUTPUT SIGNALS, COMPRISING A SIGNAL CANCELLATION NETWORK ARRANGEMENT CONNECTED TO APPLY AN ARITHMETICAL COMBINATION OF L AND R SIGNALS WHICH IS DERIVED FROM THE COMPOSITE SIGNAL TO SAID L AND R OUTPUT SIGNALS IN A PHASE TENDING TO CANCEL SAID UNDESIRED COMPONENTS, SAID NETWORK ARRANGEMENT HAVING THE CHARACTERISTIC OF PASSING THE HIGHER AUDIO FREQUENCIES WITH GREATER AMPLITUDE THAN THE LOWER AUDIO FREQUENCIES, WHEREBY GOOD STEREO SEPARATION OF THE L AND R OUTPUT SIGNALS IS ACHIEVED OVER THE ENTIRE AUDIO FREQUENCY RANGE.