Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1982-03-12
1983-09-20
Masinick, Michael A.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
H04N 540, H04N 544
Patent
active
044059442
ABSTRACT:
A television signal audio transmission system comprises transmission means for developing first and second stereophonically related audio signals and means for developing a third audio signal. The transmission means further includes circuitry for developing a composite baseband signal having a first component comprising the sum of the first and second audio signals, a second component comprising a double sideband suppressed carrier signal formed by amplitude modulating a 2f.sub.H subcarrier with the difference between the first and second audio signals, a third component comprising a pilot signal having a frequency f.sub.H and a fourth component comprising a 4f.sub.H subcarrier signal frequency modulated according to the third audio signal, where f.sub.H represents the horizontal scanning line frequency. The composite baseband signal may include a fifth component comprising an approximately 5.5f.sub.H subcarrier signal frequency modulated in accordance with a first information signal and a sixth component comprising an approximately 6.5f.sub.H subcarrier signal frequency modulated in accordance with a second information signal. In an alternate embodiment, the fourth and fifth components are replaced by a 5f.sub.H subcarrier signal frequency modulated according to the third audio signal. The composite baseband signal is used to frequency modulate a transmitted main audio RF carrier, the transmitted signal being detected by receiving circuits for reproducing the stereophonic audio signals, the third audio signal and the first and second information signals.
REFERENCES:
patent: 3046329 (1962-07-01), Reesor
patent: 3221098 (1965-11-01), Feldman et al.
patent: 3257511 (1966-06-01), Adler et al.
patent: 3388214 (1968-06-01), Eilers et al.
patent: 4048654 (1977-09-01), Wegner
patent: 4139866 (1979-02-01), Wegner
Vol. 89, Jul., 1980 SMPTE Journal, pp. 513-519.
IEEE Transactions vol. BIR 11-3, pp. 17-22, Dec., 1965.
Eilers Carl G.
Fockens Pieter
Masinick Michael A.
Zenith Radio Corporation
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