System for detecting the initial point of a digital signal in a

Details System for detecting the initial point of a digital signal in a System for detecting the initial point of a digital signal in a

1979-09-20

1981-05-05

Richardson, Robert L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358147, H04N 700

Patent

active

042662443

ABSTRACT:
A system for detecting the initial point of a digital signal is used in a system for reproducing a composite digital signal which is composed of a composite synchronizing signal having horizontal synchronizing signals, vertical synchronizing signals and equalizing pulses, and a digital signal interposed between the composite synchronizing signals. The detection system has a circuit for forming a signal of horizontal scanning period responsive to the composite synchronizing signal separated from the composite digital signal, a circuit for frequency dividing the horizontal scanning period signal located immediately after the vertical synchronizing signal in the composite synchronizing signal, and a circuit for forming, responsive to the output signal of the frequency dividing circuit, a signal corresponding to the initial point of the digital signal following the equalizing pulse in the composite digital signal.

REFERENCES:
patent: 4122477 (1978-10-01), Gallo

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