50 Hz parabolic signal filter

Details 50 Hz parabolic signal filter 50 Hz parabolic signal filter

1994-03-08

1995-05-02

Issing, Gregory C.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315403, 327125, 327133, G09G 104, H03K 408

Patent

active

054122902

ABSTRACT:
A scanning waveform generator for operation at a first or a second scanning frequency comprises a source of a parabolic shaped signal having a frequency selectable between the first or second scanning frequency. A means for generating a switching signal indicative of a video signal operating at one of a first or a second scanning frequency. A means for generating a sawtooth shaped waveform is coupled to the switching signal for switching between the first or the second scanning frequency. A means for generating an S correction signal is coupled to the source and to the sawtooth generating means. A means for filtering the parabolic signal is controllably coupled to the switching signal generator, and is also coupled to the S correction signal generating means. The filtered parabolic signal has an substantially the same shape during the first or second scanning frequency.

REFERENCES:
patent: 3740611 (1973-06-01), Slavik
patent: 4686432 (1987-08-01), Berland et al.
SGS Thomson Data Sheet For Tea 2130 Scanning Processor IC, Dated Dec. 1992 pp. 1-8.

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