Multi-standard video option for oscilloscope

Details Multi-standard video option for oscilloscope Multi-standard video option for oscilloscope

1990-02-26

1991-06-25

Karlsen, Ernest F.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Cathode ray

358 10, 358139, 364487, G01R 1300, H04N 1702

Patent

active

050270583

ABSTRACT:
A multi-standard vide option for an oscilloscope detects whether an input video signal has a bi-level or a tri-level horizontal sync pulse from a composite sync signal derived from the input video signal. A ramp signal is generated from the horizontal sync pulse having a slope of one polarity that changes to a slope of the opposite polarity when the horizontal sync pulse is tri-level. For a bi-level horizontal sync pulse the ramp is limited in magnitude and rapidly discharged at the end of the horizontal sync pulse. A digital output signal is generated from the ramp signal and has a width equal to the width of the horizontal sync pulse regardless whether it is bi-level or tri-level. From the type of horizontal sync pulse and the width or the number of lines per frame, a video standard is determined and is subsequently used to determine field identification and to automatically set up the horizontal sweep of the oscilloscope according to a selected video setup.

REFERENCES:
patent: 4011506 (1977-03-01), Bowden
patent: 4743844 (1988-05-01), Odenheimer et al.
patent: 4843562 (1989-06-01), Kenyon et al.
patent: 4875089 (1989-10-01), Judge
patent: 4959716 (1990-09-01), Bugni et al.

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