Data Translation 18729, User Manual

Page: 24 / 128

Principles of Operation
7
2
2
2
2
2
2
2
2
2
Video Input Signals
This section describes the following aspects of the supported input
signals:
• Video signal types,
• Video formats,
• Video input channels,
• Color controls,
• Pixel clock, and
• Triggers.
Video Signal Types
The DT3120 can acquire images from the following signal types:
• Monochrome
−
Data is represented as 8-bit grayscale values.
• Composite (CVBS )
−
The Color Video Broadcast Standard,
where both luminance and chrominance information is encoded
on a single composite video signal. The signal passes through
high- and low-pass filters on the board to separate the
chrominance and luminance signals. The decoded signals are
represented as 8-bit data.
• S-Video
−
This signal contains both luminance and chrominance
information. The filters on the board are bypassed. S-video
signals are generally “cleaner,” since the high- and low-pass
filters can sacrifice signal integrity.