Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1980-04-14
1982-03-23
Martin, John C.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358145, H04N 704
Patent
active
043216234
ABSTRACT:
Auxiliary signals suitable for conveying additional audio signals for stereophonic television broadcasts, bilingual sound, and the like, are transmitted in the form of modulated bursts of such auxiliary signal placed on the front porch of the composite video signal and continued through the vertical synchronization pulse intervals. At the receiver, a transmission gate is connected to receive the composite video signal and has an output coupled to an auxiliary signal demodulation circuit. The transmission gate is operated to pass only the auxiliary signal bursts in response to control signals obtained from the sweep circuit of the television receiver. By utilizing composite AM/FM modulation of the auxiliary signal or by employing quadrature modulation, dual or stereophonic sound signals may be obtained for reproduction with corresponding output utilization circuitry.
REFERENCES:
patent: 3071643 (1963-01-01), Matthews
patent: 3378773 (1966-04-01), Jeffers
patent: 3423520 (1969-01-01), Kelly
patent: 3902007 (1975-08-01), Justice
patent: 3916092 (1975-10-01), Justice
patent: 3949418 (1976-04-01), Srivastava
patent: 4134127 (1979-01-01), Campioni
Martin John C.
Matsushita Electric Corp. of America
Ptak LaValle D.
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