Revision 1.03
5-12 ChannelMaster TX7 Transmitter
5.7.3 VSB
The following parameters can be
changed using the VSB sub-menu:
• Type: 2VSB, 8VSB, 8TVSB
• Bandwidth: 6 MHz
Table 5-4: VSB Data Rates at 6MHz
VSB
Data Rate (Mbit/s)
2VSB 9.696329
8TVSB* 19.392658
8VSB 29.088987
*The ATSC standard is 8TVSB at 6MHz.
5.8 Encoder Menu Selections
The Encoder Menu sets the MPEG 2
parameters, and has four sub-menus:
• Audio
• Video
• Service
• Mux
5.8.1 AUDIO
Under the Audio sub-menu, the user
can modify parameters for Digital Audio
Channel 1 and Digital Audio Channel 2
(if active).
• Input: Off, Line/Line, Line/Mic,
Line/Mic+PP, Tone, AES/EBU,
and Embedded
• Sample Rate: (Per Display)
• Level (L): Adjusts left-side input
level from –6 dB to +6 dB; (de-
fault 0.0 dB)
• Level (R): Adjusts right-side input
level from –6 dB to +6 dB; (de-
fault 0.0 dB)
The digital audio gain adjustment allows
for ±6 dB of gain, and can be used to
compensate for variance in line and mi-
crophone input levels.
If AES is selected, the unit accepts digi-
tal AES audio on Audio 1 (and Audio 3
in a four audio unit) and sends it to the
MPEG encoder. If only two audio chan-
nels are configured, they will be the first
channel in Group 1.
If Embedded is selected, the audio
channels embedded in the incoming SDI
stream will be used.
A 1 kHz Tone can be activated. The
tone is steady on the left channel, and
intermittent on the right channel.
If Line/Mic is selected, the unit is set to
accept a line input on the left connector,
and input from a microphone on the
right connector. The microphone input
range is -4dB to +41dB. This option is
only available on models with front
panel XLR inputs.
If Line/Mic+PP is selected, the unit is
set to accept a line input on the left con-
nector, and input from a microphone on
the right connector. Phantom power is
output on pins 2 and 3 of the right con-
nector to power the microphone. The
microphone input range is -4dB to
+41dB. This option is only available on
models with front panel XLR inputs.
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