Extron Electronics VN-QUANTUM User Guide - Manual (Page 66)

Section 3: Functional Overview VN-QUANTUM User Guide
Page 66 I455GB issue 8
De-interlacing
VN-QUANTUM outputs a progressive scan to the target display. Most sources that will be connected
to the DVI Input Card will be progressive scan and will not require any special processing. However,
certain HD Video signals have an interlaced scan which will be converted to a progressive format
using one of two de-interlacing modes:
Single Field Interpolation
Three Field Interpolation
For a full explanation of these modes please see page 76.
Down-Scaling of DVI Video Sources
The on-board scaler provides down-scaling (minification) of DVI sources. Independent horizontal and
vertical scaling is possible down to 1/16 of native resolution. For example, a source of 1600x1200
pixels can be scaled down to around 100x75 pixels.
More than one scaled version of each source is possible, subject to the maximum number of sources
supported by the scaler:
Maximum number of
Sources Supported (per card)*
Real-time
Source Type De-interlacing
50Hz 60Hz
Absolute
Single field 7 5 64 HD 1080i
Three field 3 2 64
HD 1080p n/a 3 2 64
HD 720p n/a 8 6 64
UXGA n/a 3 3 64
SXGA+ n/a 5 4 64
SXGA n/a 5 4 64
WXGA n/a 7 6 64
XGA n/a 9 7 64
SVGA n/a 15 12 64
* Also dependant on the source capacity of the RAPT bus.
The scaling engine is built around Electrosonic’s patented convolver technology. This ensures that
original image detail and quality is maintained at all times.
Up-scaling (magnification) is achieved by a scaler on the Output Card. See page 75 for
further details on source scaling.
Source Transfer
DVI sources are transferred on to the RAPT bus for transport to the Output Card(s).
Only sources that are currently visible on the target display are transferred to the bus.