Apparatus for correcting the transmitted signal envelope of a compatible single sideband transmitter

Claim 1

A TRANSMITTER FOR TRANSMITTING SINGLE SIDEBAND SIGNALS COMPRISING A SOURCE OF INFORMATION SIGNALS, A SOURCE OF OSCILLATIONS OF PREDETERMINED FREQUENCY, MEANS FOR AMPLITUDE MODULATING SAID OSCILLATIONS WITH SAID INFORMATION SIGNALS TO PROVIDE FIRST SINGLE SIDEBAND SIGNALS INCLUDING SAID OSCILLATIONS AND ONE MODULATED SIDEBAND THEREOF, AN AMPLITUDE MODULATOR, FIRST AND SECOND PATHS FOR APPLYING SAID FIRST SINGLE SIDEBAND SIGN AL TO SAID AMPLITUDE MODULATOR, SAID AMPLITUDE MODULATOR COMPRISING MEANS FOR MULTIPLYING THE SIGNALS APPLIED BY WAY OF SAID FIRST AND SECOND PATHS, WHEREBY SAID AMPLITUDE MODULATOR PRODUCES A SECOND SINGLE SIDEBAND SIGNAL IN A FREQUENCY BAND AT TWICE THE FREQUENCY OF SAID OSCILLATIONS, SAID SECOND SINGLE SIDEBAND SIGNAL INCLUDING A CARRIER OSCILLATION AT TWICE THE FREQUENCY OF SAID OSCILLATIONS, MEANS FOR SYNCHRONOUSLY DEMODULATING A PORTION OF SAID FIRST SINGLE SIDEBAND SIGNAL, MEANS FOR DETECTING A PORTION OF SAID SECOND SINGLE SIDEBAND SIGNAL, MEANS FOR COMPARING THE OUTPUTS OF SAID DEMODULATING AND DETECTING MEANS TO PROVIDE A CORRECTION SIGNAL, MEANS FOR CORRECTING THE ENVELOPE OF SAID SECOND SINGLE SIDEBAND SIGNALS WITH SAID CORRECTION SIGNAL, AND MEANS FOR TRANSMITTING SAID ENVELOPE CORRECTED SECOND SINGLE SIDEBAND SIGNAL.