Electronic television picture framing circuit

Details Electronic television picture framing circuit Electronic television picture framing circuit

1981-11-30

1984-05-22

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315384, H01K 2956

Patent

active

044503865

ABSTRACT:
An electronic image framing circuit is described for eliminating the visible effects of pincushion distortion at the edges of a television image. Toward this end, portions of video lines which extend beyond a selected straight line image boundary are blanked by a pulse processor. The pulse processor responds to conventional horizontal rate and vertical rate pulses for developing blanking pulses whose widths are varied at a vertical rate. The modified blanking pulses are applied to a conventional blanking circuit for blanking the portions of video lines which extend beyond the desired image area. A parabola generator is also described for use in developing the modified blanking pulses.

REFERENCES:
patent: 3040126 (1962-06-01), Newell
patent: 3459992 (1967-08-01), Griffey
patent: 4348617 (1982-09-01), Miyazaki et al.

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