Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1981-08-13
1984-09-11
Buczinski, S. C.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358121, 358124, 358144, H04N 716
Patent
active
044713797
ABSTRACT:
There is disclosed herein a television system wherein television signals are scrambled or otherwise encoded at the transmitting facility and then unscrambled or decoded at the receiving facility, typically a home television subscriber. The television signals have a number of video fields inverted as transmitted, and these fields are reinverted by the home decoder. The normal sync pulses of a television signal are replaced with burst flags coded in the video portion of the signal. The decoder senses these burst flags and recreates conventional sync so that a composite video signal can be provided to the television receiver. The system includes a relatively simple string of decade counters and associated logic for determining which video fields are to be reinverted. The decoder is switchable, as with a suitable card or switches, to set the same for properly decoding the video. If a card is used, it may be any of various forms, such as a punched card, magnetic card or capacitive card, and such cards contain subscriber identification and different cards can be provided for a number of tiers of programming, such as normal monthly programming, sporting events, first run movies and the like. This system provides enhanced security and minimizes the chance that one subscriber's card can properly operate another subscriber's decoder. Furthermore, the system can provide audio in a form for direct reception by an FM receiver, has audio FM stereo capability, and enables audio coding and decoding to allow full stereo or a barker channel so that audio can be unintelligible to a nonsubscriber but still allow reception by the nonsubscriber of barker information.
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Buczinski S. C.
Focus Communications, Inc.
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