Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1983-02-15
1985-06-11
Buczinski, S. C.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358122, H04N 716, H04K 104
Patent
active
045232288
ABSTRACT:
Sync suppressed television signals transmitted with timing pulses in dynamically variable time delayed relationship with respect to the suppressed sync pulses are descrambled with a high degree of noise immunity by decoding tag pulses transmitted with the timing pulses into a digital signal representing the dynamically variable time delay relationship in terms of the number of such tag pulses during a predetermined period of time during each field of the TV signal, into a digital signal. The decoding is carried out to provide the digital signal with different values for different groups, each containing a different number of tag pulses. The pulses which restore the sync pulses in the TV signal in each field are timed with respect to the timing pulses in accordance with the value of the digital signal. Dynamic delay variations which vary from field to field or for any selected number of fields, during any selected period of time, may be accommodated in the descrambling of the TV signals and with high noise immunity due to the use of groups of tagging pulses in the decoding of the dynamically varying delays.
REFERENCES:
patent: 4336553 (1982-06-01), den Toonder et al.
patent: 4390898 (1983-06-01), Bond et al.
patent: 4396946 (1983-08-01), Bond
patent: 4408225 (1983-10-01), Ensinger et al.
patent: 4466017 (1984-08-01), Banker
patent: 4471380 (1984-09-01), Mobley
Buczinski S. C.
Lukacher Martin
Scientific - Atlanta, Inc.
Wallace Linda J.
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