Composite video synchronization pulse separator for color image

Details Composite video synchronization pulse separator for color image Composite video synchronization pulse separator for color image

1985-04-09

1987-06-09

Masinick, Michael A.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358 34, 358155, H04N 508

Patent

active

046724508

ABSTRACT:
An image processing system includes a synchronization separator 20 which operates to separate the synchronization pulses from the analog video information supplied. The separator includes an amplifier with a pair of input terminals. The video is coupled to one of the input terminals and a feedback loop coupled between an output terminal and the other input terminal. In this manner the negative synchronization pulses may be amplified while the positive video signals are limited. The extracted sync signal is used to control an analog-to-digital converter 70. The analog video information is then converted to digital form by an analog-to-digital converter. The converter operates under control of a time base generator 100, including a programmable delay line 300, which receives synchronization pulses from the synchronization separator, and following a programmable time delay supplies a control pulse to the converter to cause it to sample the analog waveform and convert it to digital format.

REFERENCES:
patent: 3699256 (1972-10-01), Roth
patent: 4064541 (1977-12-01), Schneider et al.
patent: 4084187 (1978-04-01), Schlotzhauer et al.
patent: 4254435 (1981-03-01), Dayton et al.

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