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Chapter 12
DA7 Users’ Guide
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12
D-I/O
Video Sync Operations
When the DA7 is using the optional SMPTE/V SYNC card, it can receive a
video input signal from an external device and use it to drive the internal
wordclock. The video sync input port has a built-in 75Ω resistor for
termination.
Button
A video sync signal into the SMPTE option card can be used as an
incoming clock source to the DA7. The DA7 can then be slaved to a
video controller for video production applications. When the
button is selected, you can choose:
[Fs] (sampling frequency) of 44.1KHz or 48KHz
[REF] (reference)- 50Hz, 60Hz, or 59.94Hz
[+-0.1%] - 0/UP/DOWN
The V SYNC reference signal input specifications are:
signal format: composite (NTSC or PAL)
input level: 1Vp-p ±8mv (no load resistor)
source impedance: 75Ω
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When producing material for use with a video production,
reference the DA7 to an incoming video signal. Do this during all
stages of the production. You will need to know the video
reference characteristics for the production, so that you can
reference the DA7 correctly.