Horizontal deflection phasing arrangement

Details Horizontal deflection phasing arrangement Horizontal deflection phasing arrangement

1983-03-28

1985-04-09

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

315371, H04N 504, H01J 2956

Patent

active

045105278

ABSTRACT:
A frequency and phase control circuit for a television receiver comprises a first phase detector for adjusting the frequency of the horizontal oscillator in response to horizontal sync pulses. A second phase detector maintains a predetermined phase relationship between the deflection circuit switching signals and a pulse indicative of the amplitude zero crossing of the horizontal deflection current. The zero crossing signal is derived from a transformer in series with the horizontal deflection winding. The transformer is normally magnetically saturated by the deflection current, except when the deflection current amplitude is close to zero. A voltage is then developed across the transformer secondary windings, producing the zero crossing pulse.

REFERENCES:
patent: 3891800 (1975-06-01), Janssen et al.
patent: 4228462 (1980-10-01), van Straaten
patent: 4321511 (1982-03-01), Willis
patent: 4327376 (1982-04-01), Balaban et al.
patent: 4385263 (1983-05-01), Luz et al.

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