Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1989-08-11
1991-11-05
Sheppard, John W.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358143, 358144, H04N 707, H04N 706, H04N 704
Patent
active
050634461
ABSTRACT:
Apparatus for converting a signal having a substantially continuous frequency spectrum to a signal having its energy concentrated at multiples of the line frequency of a video signal, includes circuitry for apportioning the signal into two intermediate signals including, in part, mutually exclusive portions of the original signal and inverting the polarity of portions of the signal. The two intermediate signals are thereafter used to quadrature phase modulate a carrier of multiple line frequency to generate a signal for combining with a video signal for transmission.
REFERENCES:
patent: 2635140 (1953-04-01), Dome
patent: 3231818 (1966-01-01), Court
patent: 3478166 (1969-11-01), Reiter et al.
patent: 4661850 (1987-04-01), Strolle et al.
Craig C. Todd, "A Compatible Digital Audio Format for Broadcast and Cable Television", IEEE Transactions on Consumer Electronics vol. CF-33, No. 3, Aug. 1987, pp. 297-305.
(Translation) "Digital Sound Signals Multiplexed in Quadrature with TV Signals" Hitachi, Ltd., ITEJ 17.varies.6-88.
General Electric Company
Hayes James B.
Herrmann Eric P.
Parker Michael D.
Sheppard John W.
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