Extron Electronics VN-QUANTUM User Guide - Manual (Page 76)

Section 3: Functional Overview VN-QUANTUM User Guide
Page 76 I455GB issue 8
De-interlacing
VN-QUANTUM outputs a progressive scan to the target display. Therefore, incoming interlaced
sources are converted to a progressive format using one of two de-interlacing modes:
Single Field Interpolation: each field from the interlaced source is transferred separately across
the RAPT bus. The ‘missing’ lines from each field are then interpolated by the Output Card to
produce a new progressive frame.
Three Field Interpolation: the Input Card analyzes adjacent field pairs from the interlaced source
and interpolates a new (‘third’) progressive frame which is transferred across the RAPT bus.
The best mode to use will depend on the content of the original source and the number of sources
that need to be transported on the RAPT bus. This is summarized as follows:
Single Field Interpolation Three Field Interpolation
Source Content More suited to high-motion content.
Generally results in a sharper image on
the display. More suited to low-motion or static
content, especially text.
Generally results in a smoother/softer
image on the display.
RAPT Bandwidth More Single Field sources can be displayed
in real-time than Three Field sources.
Less Three Field sources can be displayed
in real-time than Single Field sources.