Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1982-03-01
1984-05-01
Martin, John C.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
H04N 510
Patent
active
044464835
ABSTRACT:
A circuit arrangement for deriving a field synchronizing signal from an incoming signal which contains at least line synchronizing and field synchronizing pulses the amplitude of which extends between a reference and a peak level, comprising a signal generator for generating a signal each time a pulse having a value which is located between the reference and the peak level occurs in the incoming signal. Said signal whose value is a measure of the duration of said pulse is compared with a first threshold value. During the occurrence of the line synchronizing pulses the signal of the signal generator is inhibited as long as the first threshold value has not yet been reached. The signal from the signal generator is compared with a second threshold value which is a measure of a pulse duration which exceeds the duration corresponding to the first threshold value. The field synchronizing signal is generated as soon as the second threshold value is reached.
REFERENCES:
patent: 3527888 (1970-09-01), Clapp et al.
patent: 3632872 (1972-01-01), Ridley
Radio Shack, Dictionary of Electronics, 1974-1975, pp. 368-369, "Monostable".
Briody Thomas A.
Martin John C.
Parker Michael D.
Streeter William J.
U.S. Philips Corporation
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