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CPP100
SECTION 9
CPP1OPS
25/10/06
www.snellwilcox.com
Version 1 Issue 6
9.22
Enhancer cont.
Mode - Video Mode
The aim of the video mode is to reduce the temporal bandwidth of video source material by pre-filtering and
temporal sub-sampling. Temporal sub-sampling reduces the number of fields that contain picture differences,
which in turn increases the encoding efficiency.
Mode 1
In Mode 1, a single input field is filtered to produce two output fields. Two different apertures are used for the
input field (skewed by one field) and the output is generated by switching between the two filters at field rate.
Mode 2
In Mode 2, two input fields are combined using a vertical temporal filter to produce two output fields.
Although mode 2 attenuates high frequency diagonals more than mode 1, it has no 25Hz temporal flicker
component as both input fields are identically filtered.
Filter 1
Filter 2
Field
switch