Facsimile and static presentation processing – Static presentation processing – Attribute control
Patent
1984-03-02
1987-05-12
Shepperd, John W.
Facsimile and static presentation processing
Static presentation processing
Attribute control
358 12, 358143, 358 13, H04N 1100, H04N 706
Patent
active
046654275
ABSTRACT:
A wide-band frequency modulated DBS signal of the type having time sequential compressed chrominance and luminance (video) components is received by an aerial (1), frequency converted in a down converter (2) and applied to the input (4) of a conversion unit. The conversion unit has a tuner (5), i.f. stage (9,10) and a frequency demodulator (11) to produce baseband video which is applied after de-emphasis at (12) to a modulator (27) where the video is amplitude modulate onto a vision carrier from an oscillator (28). The modulated carrier is applied through a vestigial sideband filter (29) and an adder (30) to an output (31). Sound/data bursts present in the DBS signal are recovered in a stage (13) and processed in a processor (14) where the sound/data bursts are expanded to occupy approximately a line period at a bit rate which is an integral sub-multiple of the bit rate for the sound/data bursts in the received DBS signal. The expanded sound/data and clock frequency are digitally modulated in a modulator (32 ) onto a sound carrier from an oscillator (33), the modulated sound carrier being applied through a bandpass filter (34) and the adder (30) to the output (31). The output (31) is connected to a cable distribution system for which the narrow band signals produced by the conversion unit are suited as such systems cannot cope with high bit-rates. The processing of the sound/data bursts such that their bit rate is substantially reduced also simplifies the handling and demodulation processes for these bursts.
REFERENCES:
patent: 3781463 (1973-12-01), Van den Bussche
patent: 3789137 (1974-01-01), Newell
patent: 4245235 (1981-01-01), Poetsch
patent: 4335393 (1982-06-01), Pearson
patent: 4476484 (1984-10-01), Haskell
patent: 4544950 (1985-10-01), Tu
Herold, "A Compatible High-Resolution TV System for Cable Casting", Proceedings of the IEEE, vol. 36, No. 7, Jul. 1970.
K. Lucas and M. D. Windram, Direct Television Broadcasts by Satellite-Desirability of a New Transmission Standard, IBA Report 116/81, pp. 1-19.
Beckley John C.
Brennand Peter R.
Murray Bruce
Briody Thomas A.
Oisher Jack
Shepperd John W.
Streeter William J.
U.S. Philips Corporation
LandOfFree
Method and apparatus for converting C-MAC television signals for does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for converting C-MAC television signals for, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for converting C-MAC television signals for will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1805187