Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1983-06-10
1985-09-17
Buczinski, S. C.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358122, H04N 716
Patent
active
045424071
ABSTRACT:
A method for scrambling and descrambling television programs in which the horizontal synchronizing information is suppressed at a CATV supplier's head-end and then regenerated at the subscriber's converter. The pulse frequency is multiplied by a factor N/M, in which N and M are integers thereby generating a synthesized pulse stream which is, in turn, encoded with data identifying the values for N and M. This encoded pulse stream is modulated onto the audio subcarrier wave in the TV video signal and transmitted to the converter. The converter then demodulates and recovers the encoded pulse stream, decodes the same to recover the identifying data, using this data to obtain the correct values for N and M which have been transmitted separately on a digital data channel. The converter then multiplies the synthesized pulse stream by M/N regenerating the horizontal synchronizing pulse stream and inserts the same into the TV video signal at the proper phase.
REFERENCES:
patent: 2892882 (1959-06-01), Hughes
patent: 4292650 (1981-09-01), Hendrickson
patent: 4390899 (1983-06-01), Osaka et al.
patent: 4398215 (1983-08-01), Osaka
patent: 4466017 (1984-08-01), Banker
Cooper Jeffrey L.
Johnson Brian C.
Briody Thomas A.
Buczinski S. C.
Goodman Edward W.
North American Philips Corporation
Streeter William J.
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