Skew error correction circuit for video signal reproducing appar

Details Skew error correction circuit for video signal reproducing appar Skew error correction circuit for video signal reproducing appar

1985-06-26

1988-05-24

Psitos, Aristotelis M.

Dynamic magnetic information storage or retrieval

Monitoring or testing the progress of recording

360 76, H04N 578

Patent

active

047469960

ABSTRACT:
A skew error correction device for a video signal in a television receiver or the like is disclosed. An oscillator produces an oscillation output signal of a constant frequency which is phase-synchronized with horizontal synchronization information included in an input video signal, and the output signal is used as a write clock. In a vertical blanking period, the oscillation output signal or a frequency-divided signal thereof is phase-compared with an output of a reference signal generator of a predetermined frequency or a frequency-divided signal thereof, and a phase error signal is negatively fed back to voltage control means which voltage-controls the oscillation frequency of the oscillator. Thus, the oscillation frequency is stabilized without using an AFC circuit and a skew error in the input video signal is eliminated.

REFERENCES:
patent: 4065787 (1977-12-01), Owen et al.
patent: 4353099 (1982-10-01), Shum et al.
patent: 4368492 (1983-01-01), Chamberlain et al.
patent: 4389678 (1983-06-01), Mizukami et al.
patent: 4438456 (1984-03-01), Toshinaka
patent: 4577236 (1986-03-01), Takanushi
IBM Technical Disclosure Bulletin; vol. 18, No. 1, Jun. 1975, pp. 164-165, Grimes: "Skew Detector and Corrector for a Disk, Drum or Tape Storage".

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