Two-loop horizontal AFPC system

Details Two-loop horizontal AFPC system Two-loop horizontal AFPC system

1980-09-29

1982-02-23

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

H04N 504

Patent

active

043171338

ABSTRACT:
A television horizontal AFPC system is provided including a first AFPC loop responsive to horizontal sync signals for producing a noise immune signal in phase and frequency synchronism with the horizontal sync signals. A second AFPC loop includes a phase detector responsive to a second horizontal frequency signal and flyback pulses, and produces horizontal deflection drive signals as a function of the phase relationship determined by the phase detector. A delay circuit is responsive to the noise immune horizontal frequency signal for producing the second horizontal frequency signal for the phase detector with a phase delayed with respect to the noise immune signal. A lowpass filter may be provided to delay the application of the flyback pulses to the second phase detector, its delay being chosen in accordance with the delay of the delay circuit so that a centered picture is produced on the television kinescope.

REFERENCES:
patent: 3891800 (1975-06-01), Janssen et al.
Feindt et al., "Integrated Line Oscillator Combination TBA920", Mullard Technical Communications, No. 118, Apr. 1973, pp. 240-257.

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