System for communicating a periodic signal by means of coherent

Details System for communicating a periodic signal by means of coherent System for communicating a periodic signal by means of coherent

1977-11-14

1979-08-14

Richardson, Robert L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

178 691, H04N 504, H04N 526

Patent

active

041647572

ABSTRACT:
A system for communicating a periodic signal, such as a timing signal, over a relatively low frequency channel. The periodic signal is modulated (e.g. amplitude modulated) onto a low frequency carrier signal which is phase-locked with the periodic signal. Since the carrier is coherent with the periodic signal, phase jitter and other spurious variations, which would otherwise be present in the subsequently demodulated signal, are essentially eliminated. The system is described with specific reference to the communication of timing signals between a television camera head and a camera control unit. In the described system, coherence between the carrier signal and the timing signal is assured by using the carrier signal to clock the circuit which generates the timing signal.

REFERENCES:
patent: 2987574 (1961-06-01), Gatfield et al.

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