Matrox Vio, Installation And Hardware Reference

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Matrox Vio Duo acquisition section 27
Matrox Vio Duo acquisition section
Matrox Vio Duo supports acquisition of both analog and digital video. Although
you can acquire data from only one video source at a time, you can attach several
video sources and switch between them. The board features six software-selectable
input channels: four for analog video and two for digital video.
For analog video acquisition, you can attach either:
• One CVBS video source.
• One Y/C video source (and if required one CVBS video source).
• One RGB video source (and if required one CVBS video source).
• One YPbPr video source (and if required one CVBS video source).
For digital video acquisition, you can attach up to two independent HD/SD-SDI
video sources.
To switch between video sources of the same type, allocate a single digitizer (using
the MIL-Lite function
MdigAlloc() ) and switch between the input channels
(using the MIL-Lite function MdigChannel() ). To grab and switch between
different types of video sources, allocate a digitizer for each type of video source.
Digital acquisition
The digital acquisition path captures SD or HD digital video in SDI format and
converts it to 20-bit YCbCr data.
Cable equalizer
The digital video signal acquired by the input BNC passes through a multi-rate
cable equalizer. This is a high speed bipolar integrated circuit that equalizes and
restores signals received over the 75 Ohm co-axial cable.
Multi-rate deserializer
A multi-rate deserializer is used to recreate data that is transmitted over a serial
digital input stream. The deserializer can accept SD-SDI video (480i) at
270 Mbytes/sec (SMPTE 259M-C) or HD-SDI video (720p, 1080i) at
1.485 Gbytes/sec (SMPTE 292M). It uses the reference clock signal from a voltage
controlled oscillator (VCO) to reclock the input stream and then convert the data
to YCbCr 20-bit pixel format.