Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1982-03-30
1986-05-13
Buczinski, S. C.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
H04N 7167
Patent
active
045890170
ABSTRACT:
In a system for receiving a scrambled pay television signal wherein a radio frequency video signal with a horizontal synchronizing signal erased therefrom by elevating portions of the video signal containing picture information and a radio frequency aural signal with a horizontal synchronizing trigger pulse and a data processing trigger pulse superposed thereon are received, the data processing trigger pulses are detected from the radio frequency aural signal and are used for comparison with a code assigned to a pay television receiving subscriber, and the horizontal synchronizing signal is restored on the basis of the horizontal synchronizing trigger pulses when the pay television broadcast is receivable; the improvement comprising a waveform shaping circuit which shapes the horizontal synchronizing trigger pulse and the data processing trigger pulse into desired pulse forms, a clock isolating circuit and a data isolating circuit to which the shaped pulses are applied and which deliver horizontal synchronizing pulses and data pulses respectively, a data comparator which makes the comparison by the use of the data pulses applied thereto, a vertical synchronizing signal-regenerating circuit which delivers a vertical synchronizing pulse, a gate circuit which is controlled by an output of the data comparator and which, when enabled, delivers a signal with the vertical synchronizing pulse added to the horizontal synchronizing pulse, and a switching attenuator which is controlled by the output signal of the gate circuit.
REFERENCES:
patent: 3184537 (1965-05-01), Court et al.
patent: 3530232 (1970-09-01), Reiter et al.
patent: 3729576 (1973-04-01), Court
patent: 3777053 (1973-12-01), Wittig et al.
patent: 4022972 (1977-05-01), Pires
patent: 4024574 (1977-05-01), Nieson
patent: 4025948 (1977-05-01), Loshin
patent: 4095258 (1978-06-01), Sperber
patent: 4145717 (1979-03-01), Guif et al.
patent: 4323922 (1982-04-01), Toonder et al.
Buczinski S. C.
Shoup Guy W.
LandOfFree
Pay television receiving system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Pay television receiving system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Pay television receiving system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1773354