Matrox Vio, Installation And Hardware Reference

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34 Chapter 3: Matrox Vio Duo Hardware Reference
Matrox Vio Duo display section
Matrox Vio Duo can output video to an auxiliary display in either analog mode,
digital mode
1
, or both simultaneously. In either mode, video is output to the
display at the original acquisition resolution. In addition, if the acquisition mode
and the display mode are the same, video is output in its original acquisition
resolution; the format can change as long as the resolution is the same.
Digital display
The digital display path converts the digitized video output by the video controller
to its appropriate digital video format.
Multi-rate serializer
A multi-rate serializer converts the YCbCr 20-bit digitized video received from
the video controller into a serial digital bitstream and performs appropriate
encoding and scrambling. It does so in conjunction with the reference clock signal
from a Voltage Controlled Oscillator (VCO). When displaying acquired data, the
reference clock signal that is produced is the same as the reference clock signal
used during acquisition.
Cable driver
The digital video signal output by the serializer goes through a multi-rate cable
driver. This is a high-speed bipolar integrated circuit designed to drive signals sent
over one or two 75 Ohm co-axial cables.
Analog display
The analog display path converts the digitized video, output by the video
controller, to its appropriate analog video format.
Multi-format video encoder
A multi-format video encoder converts the 20-bit YCbCr digitized video stream
output by the video controller into an analog video signal. The encoder contains
six 12-bit D/A converters which perform high-speed digital-to-analog conversion.
Low-pass filters
Analog video signals, sent to the analog video output connector, pass through 4th
order Butterworth filters in a low-pass filtering stage. This limits high frequency
noise and smooths the reconstructed signal by removing unwanted higher
frequency components.
1. Except when outputting video captured with square pixel digitization.