Extron electronics VN-Matrix 250 Series, Руководство пользователя

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Bandwidth Management – Advanced Control
6. If necessary, click
More Detail
to open the
Video Quality
and
Bandwidth
panel:
1 1
2 2 3 3
4 4
5 5 6 6
7 7
8 8
Figure 51. Encoder Video Bandwidth Tab Advanced Control
Spatial compression luminance and chrominance settings
7. Set the
Luminance
(see figure 51,
1
) and
Chrominance
(
2
) values from the
appropriate drop-down list. These controls are normally locked, using the
Lock
check
box (
3
), with an offset of 2 units between them.
A
Luminance
value of
0
provides the minimum spatial compression; a
Luminance
value
of
10
provides the maximum spatial compression.
8. If required, the
Chrominance
compression can be set independently by clearing the
Lock
check box. A spatial compression setting of
4
/
6
(luma 4; chroma 6) provides
visually lossless compression.
9. Apply temporal compression by selecting the
Temporal
check box (
4
). By default, this
option is selected.
10. Adjust the
Threshold
(
5
) to modify the detection point of the temporal compression
algorithm. A value of
0
results in all changes between frames being sent. As the
threshold value is increased, only changes above a certain level are sent, thus reducing
the bit rate.
NOTE:
This control compensates for sources with high levels of noise.
11. Enable
Chroma
( 6 ) to determine whether the temporal algorithm should consider
changes in the color or chrominance of the image. Enabling
Chroma
gives better
results on digital simulation type sources but results in a higher bit rate for any given
compression.
12.
Adjust the
Refresh Rate
( 7 ) to control how frequently the non-changing parts of
the screen are updated in temporal compression mode. A refresh rate setting of
1
is
suitable for most applications.
13. If it is necessary to set a bit rate limit, select the control mode from the
Mode
drop-down
box (
8
and see the figure at right).
See Bandwidth Management panel on page 49 for a
complete explanation of these options.
None
None
Manual Frame Drop
Shared Flowrate (FD)
Peak Flowrate (FD)
PBR-F
PBR-F (FD)
None
VNM 250 • Configuration with the VNM 250 GUI 70