Circuit for correcting phase deviations between the line deflect

Details Circuit for correcting phase deviations between the line deflect Circuit for correcting phase deviations between the line deflect

1981-01-21

1982-09-21

Richardson, Robert L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

H04N 504

Patent

active

043510027

ABSTRACT:
A substantially digital circuit for correcting phase deviation which comprises a phase comparison stage and a synchronizing control stage. The phase comparison stage includes a reference oscillator, a frequency divider connected to the output of the oscillator and whose output signals constitute the useful line deflection drive signals, as well as a phase comparator comprising a logic circuit and a counter. The logic circuit receives the output signals of the frequency divider and the line synchronizing signals and the counter, which is connected to the output of the oscillator produces a signal which is representative of the phase deviation detected in control stage, the latter comprising a state detector for detecting the synchronized state, in which the phase deviation detected is below a limit value or the unsynchronized state and a correction signal generator for controlling the division ratio of the frequency divider. This frequency divider comprises a counter, an adder, and a decoder the output signal of which is stabilized by means of a stabilizing stage.

REFERENCES:
patent: 3821470 (1974-06-01), Merrell

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