C2-4000 Series RGB Scaler Operation Manual
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THEORY OF OPERATION
The C2-4100 Scaler supports up to 10 inputs and when an operator selects
an input, the RGB and YUV inputs are routed to a triple 8bit analog to digital
converter and then passed to the input of the scaling engine. The synchro-
nization pulses from these signals are buffered and passed to the scaling
engine and, in the case of composite sync, sync on green or sync on Y, the
sync pulses are separated from the video and then passed to the scaling
engine.
When a Genlock input is selected, its signal is not converted to digital––it’s
kept in the analog format since no processing is required for genlocking.
For a Preview input, the signal is simply routed and then buffered before
being output.
The input video processing circuit of the scaling engine converts the video
data to YUV 4:2:2, scales to a suitable internal resolution and stores the
image in the double-buffered frame store memory. Motion compensation or
3:2 pull down is applied before storing in memory.
If the Scaler is in a Genlock mode, genlock information is used to generate
the signals needed to read the data from the double-buffered memory and the
output sync signals. If the Scaler is not in genlock mode, the selected output
resolution is used to generate signals required to read the data from the
double buffer memory.
The double buffer output is then scaled to the proper resolution and sent to
the correct encoder. For RGB and YUV signals, the output of the scaling
engine is fed into a triple digital to analog converter.
Summary of Contents for C2-4000 Series
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