Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1975-02-25
1977-05-24
Wilbur, Maynard R.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358124, H04N 144
Patent
active
040259480
ABSTRACT:
At the sending end, a plurality of high-frequency oscillators each furnish a signal having a frequency different from the frequency of the other of the oscillators. Timing signals derived from the television signal and signals from a random pulse generator are combined to furnish enabling signals for enabling the high-frequency oscillators during predetermined time intervals of the television signal and in a random order. A logic circuit which includes externally operable switches for setting up a program code assignment receives the enabling signals and furnishes an encoder control signal only in response to certain selected enabling signals. The encoder control signal changes the polarity of the picture signals relative to the synchronizing signals in the television signal. A mixer mixes the oscillator signals into the encoded television signal. At the decoder the oscillator signals are filtered out, and a logic circuit set up in accordance with a punch card having a program corresponding to the code assignment at the encoder furnishes a decoder control signal which causes a reversal of the polarity of the picture signals thereby reestablishing a standard television signal.
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patent: 3081377 (1963-03-01), Watters
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patent: 3757035 (1973-09-01), Sullivan
patent: 3824332 (1974-07-01), Horowitz
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Buczinski S. C.
Rich Marianne
Teleglobe Pay-TV System, Inc.
Wilbur Maynard R.
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