Compatible stereophonic transmission and reception systems, and methods and components characterizing same

Claim 1

THE METHOD OF TRANSMITTING A STEREO PAIR OF AUDIO SIGNALS SO AS TO EACH BE RECEIVABLE ON CONVENTIONAL ENVELOPE DETECTION TYPE AM RECEIVER MEANS, COMPRISING GENERATING A STEREO PAIR OF AUDIO SIGNALS, PHASE AMPLITUDE MODULATING A RADIO FREQUENCY WAVE WITH A FIRST MODULATING WAVE WHICH IS SUBSTANTIALLY A LINEAR FUNCTION OF THE DIFFERENCE BETWEEN THE TWO STEREO SIGNALS, AMPLITUDE MODULATING THE PHASE MODULATED RADIO FREQUENCY WAVE WITH A SECOND MODULATING WAVE WHICH IS SUBSTANTIALLY A LINEAR FUNCTION OF THE SUMMATION OF SAID TWO STEREO SIGNALS, MAINTAINING SAID FIRST AND SECOND MODULATING WAVES SUBSTANTIALLY IN QUADRATURE RELATION FOR MODULATING FREQUENCIES OVER AT LEAST MOST OF THE STEREOPHONICALLY DISTINGUISHABLE AUDIO FREQUENCY SPECTRUM, AND MAINTAINING THE CORRESPONDING AMPLITUDE MODULATION AND PHASE MODULATION OF THE RADIO FREQUENCY WAVE IN QUADRATURE RELATION TO PROVIDE AN UPPER SINGLE-SIDEBAND REPRESENTING SUBSTANTIALLY THE INTELLIGENCE OF ONE OF SAID STEREO SIGNALS AND A LOWER SINGLE-SIDEBAND REPRESENTING SUBSTANTIALLY THE INTELLIGENCE OF THE OTHER OF SAID STEREO SIGNALS, AND TRANSMITTING THE MODULATED RADIO FREQUENCY WAVE THUS PRODUCED.

Claim 2

THE METHOD OF TRANSMITTING A STEREO PAIR OF AUDIO SIGNALS SO AS TO EACH BE RECEIVABLE ON CONVENTIONAL ENVELOPE DETECTION TYPE AM RECEIVER MEANS, COMPRISING GENERATING A STEREO PAIR OF AUDIO SIGNALS, PHASE AMPLITUDE MODULATING A RADIO FREQUENCY WAVE WITH A FIRST MODULATING WAVE WHICH IS SUBSTANTIALLY A LINEAR FUNCTION OF THE DIFFERENCE BETWEEN THE TWO STEREO SIGNALS, AMPLITUDE MODULATING THE PHASE MODULATED RADIO FREQUENCY WAVE WITH A SECOND MODULATING WAVE WHICH IS SUBSTANTIALLY A LINEAR FUNCTION OF THE SUMMATION OF SAID TWO STEREO SIGNALS, MAINTAINING SAID FIRST AND SECOND MODULATING WAVES SUBSTANTIALLY IN QUADRATURE RELATION FOR MODULATING FREQUENCIES OVER AT LEAST MOST OF THE STEREOPHONICALLY DISTINGUISHABLE AUDIO FREQUENCY SPECTRUM, AND MAINTAINING THE CORRESPONDING AMPLITUDE MODULATION AND PHASE MODULATION OF THE RADIO FREQUENCY WAVE IN QUADRATURE RELATION TO PROVIDE AN UPPER SINGLE-SIDEBAND REPRESENTING SUBSTANTIALLY THE INTELLIGENCE OF ONE OF SAID STEREO SIGNALS AND A LOWER SINGLE-SIDEBAND REPRESENTING SUBSTANTIALLY THE INTELLIGENCE OF THE OTHER OF SAID STEREO SIGNALS, AND TRANSMITTING THE MODULATED RADIO FREQUENCY WAVE THUS PRODUCED.