A hybrid-sideband communications system.
Feit, Harry H.
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The purpose of this paper is to present a communications system which uses a combination of single and double- sideband techniques. Audio intelligence information is transmitted via single sideband and a single frequency tone is transmitted via double sideband to provide a means of carrier- frequency reinsertion at the receiving terminal. This system provides the power and spectrum conservation achieved by single-sideband techniques, and the means of obtaining the proper frequency for carrier reinsertion at the receiver which can be obtained by synchronous reception of the double- sideband information. The carrier frequency, which is common to both the single and doublesideband signals during the generation process at the transmitter, is suppressed to the fullest possible extent prior to the actual transmission of the sidebands. Use of a narrow bandwidth filter for the double sidebands at the receiver allows the synchronizing tone to be transmitted at a level much lower than that of the intelligence-bearing single sideband, providing economy of transmitted power. The inherent automatic-frequency-control feature of the synchronous detector allows system frequency stability requirements to be lessened, and provides rapid frequency correction to overcome Doppler frequency shifts.
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