DTC SOLO7 Series, Руководство пользователя

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Revision 19.1 SOLO7 Transmitter User Guide
Copyright © 2013 Domo Tactical Communications (DTC) Limited. All rights reserved.
Commercial in Confidence
Page 7-42
7.3 Recommended Manual Video Encoder Settings
Note : The preferred method to set range and video quality settings would be to use the sliders explained in
Section 4.3. This section may be used as a guideline for manual settings only.
The SOLO7 Transmitter can offer transmission bitrates from 150kbps
-1
to almost 30Mbps
-1
. The DTC product
uniquely offers this wide data rate range in the marketplace. When a user chooses a lower bitrate link they
will achieve much greater range than standard achieved by a DVB-T link. Range increases of 2 to 5 times
over DVB-T are possible.
DTC encoding products provide the user with a wide range of settings so that a user can trade-off increased
image resolution vs frame rate vs latency for any chosen COFDM link mode.
DTC Video Encoders offer both
Standard Delay
and
Low Delay
settings.
Standard Delay
provides between
0.5 to 1 second delay for bitrates above 1Mbps and slightly longer delays as the bitrate is reduced. Low
Delay typically reduces the end-to-end delay by a factor of 4 to 8. When operating with COFDM links below
600kbps of bitrate it is recommended to only use Standard Delay mode.
7.3.1 Recommended Single SD Video Settings
Table 7-1 details settings for a
single standard definition ( SD ) video input in NTSC or PAL format.
System and
Bandwidth Modulation Type Bitrate SD Video NTSC/PAL
Low Delay SD Video NTSC/PAL
Standard Delay
DVB-T
8MHz QPSK 1/2
Guard 1/32 6 Mbps Full resolution Full resolution
Narrowband
2.5MHz 16QAM 2/3 4.8Mbps Full resolution Full resolution
Narrowband
2.5MHz QPSK 2/3 2.4Mbps 3/4 horizontal
Full frame rate Full resolution
Narrowband
1.25MHz QPSK 2/3 1.2Mbps Low delay progressive
3/4 horizontal
Full frame rate
3/4 horizontal
Full frame rate
Narrowband
625MHz QPSK 2/3 600kbps N/A Progressive
3/4 horizontal
1/2 frame rate
Narrowband
625MHz BPSK 2/3 300kbps N/A Progressive
1/2 horizontal
1/2 frame rate
Table 7-1 Typical Single SD Video Settings