Parabolic waveform generating apparatus

Details Parabolic waveform generating apparatus Parabolic waveform generating apparatus

1993-01-27

1994-04-05

Groody, James J.

Television

Image signal processing circuitry specific to television

Sweep expansion or reduction

31536812, 31536821, 315392, 348806, H04N 323, H04N 322, H04N 3223, H04N 327

Patent

active

053010256

ABSTRACT:
Horizontal or vertical parabolic waveforms corresponding to arbitrary aspect ratios are generated with a relatively small number of memory devices for storing data values which are used for generating parabolic waveforms to compensate horizontal or vertical deflection distortion in television receivers. A first and second memory device which each store data values for generating parabolic waveforms necessary for the images of a specific aspect ratio (for example (4:3) and (16:9)) are provided. When a desired aspect ratio is given to a logic circuit, two coefficients are calculated in a coefficient arithmetic logic unit and the outputs of the first and the second memory devices are allocated proportionally in a logic circuit. The output data values of the logic circuit are then converted to a desired parabolic waveform.

REFERENCES:
patent: 3757161 (1973-09-01), Kline
patent: 4551754 (1985-11-01), Meise
patent: 5070281 (1991-12-01), Ogino et al.

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