Revision 2.2
Operation
5-11
VSB
For the VSB (Digital) sub-menu, the
following parameters can be changed:
• Type: 2VSB, 4VSB, 8VSB,
16VSB, 8TVSB
• Bandwidth: 6 MHz, 7 MHz,
8 MHz
BW = 6 MHz
Data Rate
(Mbit/s)
2 VSB 9.7
VSB
4/8T VSB 19.4
8 VSB 29.1
16 VSB 38.8
BW = 7 MHz
Data Rate
(Mbit/s)
2 VSB 11.3
VSB
4/8T VSB 22.6
8 VSB 33.9
16 VSB 45.3
BW = 8 MHz
Data Rate
(Mbit/s)
2 VSB 12.9
VSB
4/8T VSB 25.5
8 VSB 38.8
16 VSB 51.7
Note that the data rate for non-Trellis
coded 4 VSB is the same as 8 VSB
with Trellis coding.
8 VSB with Trellis coding @ 6MHz is
the ATSC standard.
VSB Data Rates
Encoder Menu Selections
The Encoder Menu establishes the
operating parameters for the MPEG 2
Encoder (Digital). The Encoder Menu
has four active sub-menus:
• Audio
• Video
• Table
• GOP
Under the Audio sub-menu, the user
can choose between Digital Audio
Channel 1 and Digital Audio Channel 2
(if active). For each of these channels,
changes can be made to the following
parameters:
• Input: Off, Line, Tone, AES/EBU,
and Embedded
• Sample Rate: (Display Only)
• Level (L): Adjusts left-side input
level from –6 dB to +6 dB;
(default 0.0 dB)
• Level (R): Adjusts right-side input
level from –6 dB to +6 dB;
(default 0.0 dB)
The digital audio gain adjustment allows
for ±6 dB of gain, and can be used to
compensate for variance in line levels.
If AES is selected, the unit accepts de-
embedded SDI audio on Audio 1 (and
Audio 3 in a four audio unit) and sends it
to the MPEG encoder. If only two audio
channels are configured, they will be the
first channel in Group 1.
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