Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1985-02-14
1985-11-19
Buczinski, S. C.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358114, 358176, 358178, H04N 716, H04N 552
Patent
active
045545812
ABSTRACT:
An addressable subscription television decoder includes an input stage including an IF amplifier for converting a scrambled RF television signal to a composite baseband video signal. The baseband video signal comprises either a nominal sync component or a sync component having suppressed horizontal sync pulses during video fields and having non-suppressed sync pulses during vertical intervals, the vertical intervals also including selected encoded data signals. An AGC voltage for controlling the gain of the IF amplifier is developed by a circuit exhibiting a relatively short time constant whenever the composite baseband video signal is characterized by nominal level sync pulses, the time constant being increased in response to suppressed horizontal sync pulses. The sync pulses produced during the vertical intervals of the composite baseband video signal are thereby not subjected to excessive IF gain for facilitating processing of the data signals by the decoder.
REFERENCES:
patent: 4100575 (1978-07-01), Morio et al.
patent: 4222068 (1980-09-01), Thompson et al.
patent: 4253114 (1981-02-01), Tang et al.
patent: 4360825 (1982-11-01), Srivastava
patent: 4408225 (1983-10-01), Ensinger et al.
Bretl Wayne E.
Tentler Michael
Walker David L.
Williams Gregory A.
Buczinski S. C.
Koltak Melissa
Zenith Radio Corporation
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