Eastman-kodak Company

Peter J McNeilly

Martin E Trzcinski

Joseph P Maune

Elliot D Macomber

A sync stripper circuit receives from a medical imaging modality a composite video signal with a horizontal sync frequency within one of first, second, third or fourth frequency ranges. The sync stripper circuit includes a circuit for stripping the composite sync signal from the received signal; horizontal sync detection circuit for detecting the horizontal sync signal from the stripped composite sync signal; a vertical sync detection circuit for detecting the vertical sync signal; an F1/F2 field detection circuit for detecting the F1/F2 field from the stripped composite sync signal; and a control circuit for controlling the horizontal sync detection circuit, the vertical sync detection circuit and the F1/F2 field detection circuit to operate in the selected one of said first, second, third or fourth frequency ranges of the received composite video signal. A serrating signal circuit inserts a horizontal signal into the vertical sync signal if serrating signals are absent therein.

Sync stripper circuit

A medical imaging system includes a video interface connecting different medical imaging modalities to a laser printer. The video interface includes a clock recovery phase-lock-loop (PLL) as a frequency synthesizer video signal from a modality. A second PLL inserts a pulse train equal to the horizontal frequency into an analog video signal having a vertical sync interval with no serrating pulses. This assures the clock recovery PLL will maintain lock during the vertical sync interval.

Clock recovery circuit

A medical imaging system includes a video interface having a DC restore circuit for dynamically shifting an analog video signal so that its peak to peak amplitude is equal to the preselected range of an analog-to-digital converter.

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Rochester, NY, United States of America

Peter J McNeilly