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6.5.1. Setting the De-Interlacer Mode
De-interlacing is only required for interlaced HDTV signals (e.g.1080i/59.94). It is used in order to restore
motion dependent elements to their correct positions in the down-converted raster. In 1080i/59.94
television, the interlaced line 2 commences 16.667ms after the start of line 1 and 16.636ms after the start
of line 3. Any significant movement on line 2 will be displaced in time, because of the delay in scanning
field 2 after the scanning of field 1 has been completed. This will cause motion related artifacts. For
interlaced material, it is therefore desirable to provide compensation for horizontally and vertically
displaced motion. Selecting the frame based mode of the down-converter enables these corrections. In
frame based mode, the signal is de-interlaced and both horizontal and vertical motion adaptive
interpolators are employed to correct the motion displacement. The de-interlacing process converts each
field into a full 1080 line frame at 59.94 frames per second. This signal is subsequently re-interlaced into
the new SDTV output format, with significantly reduced motion artifacts.
Deinterlacer
Deinterlacer Mode
Field
Frame
6.5.2. Setting the Freeze Frame Threshold
Deinterlacer
Freeze Frame
Threshold
16
0 to 31
6.5.3. Setting the Noise Reduction
Two controls allow you to control the de-interlacer noise reduction.
Deinterlacer
Noise Reduction
Resolution
1
0 to 7
With this control, you can set whether the module will perform field or frame
based down conversion.
In Field mode the Downconverter works on a field by field basis. This mode
is recommended for 3:2 pulldown content on interlaced video formats but
gives a softer vertical down conversion. This mode is applicable to
interlaced video input formats only. If Field mode is selected for progressive
or sF video formats the down converter will operate in Frame mode.
In Frame mode the downconverter works on a complete frame basis thus
providing a crisper image. It is a good choice for interlaced images that do
not contain 3:2 pulldown or for progressively scanned video. This mode is
the only mode available for progressive and sF video formats.
With this control, you can set the number of frames before frozen/missing
video is detected.
With this control, you can set the resolution for the Noise Reduction Level
control. Larger numbers mean coarser steps in the level control.
Revision 1.2
7712HDC HD Broadcast Quality Down Converter
7700 MultiFrame Manual
7712HDC-23
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