Cisco D9054 Installation And Operation Manual page 71

Audio Menu,
Continued
Dolby Digital, <ch1 to ch6>, Mode
Parameters:
Description:
Dolby Digital, <ch1 to ch6>, Passthrough
Parameters:
Description
4038938 Rev A
Note: This menu will only be displayed if you have installed the
Dolby Digital audio option.
Stereo 2/0, Dual Mono 1+1, Mono 1/0, 3/2 (L,R,C,Ls,Rs).
Use this setting to select the number of channels and the channel
format within the encoded bit stream.
The three available audio encoding modes are listed below. The
mode definition uses two numbers (
number of front channels, and
(surround) channels.
Mode
Stereo 2/0
Dual Mono 1+1
Mono (Center) 1/0
3/2 (L,R,C,Ls,Rs)
The default setting is Stereo (
If the mode is set to Dual Mono (1+1), then two completely
independent program channels, referenced as Mono Channel 1 and
Mono Channel 2, are encoded into the bit stream. Dual-mono mode
is primarily intended for professional applications. Dual-mono
cannot be expected to work with consumer Dolby Digital (AC-3)
decoders.
Note: The 3/2 (L,R,C,Ls,Rs) mode is only available for encoders
equipped with a Multiple Channel Audio (MCA) card.
Note: The 3/2 (L,R,C,Ls,Rs) mode is only available for ch1 and ch4.
Enable, Disable.
From this menu you enable or disable passthrough of Dolby Digital.
The D9054 HD Encoder accepts a pre-encoded Dolby Digital audio
input. It is recommended that you set the maximum data rate to
that of the external Dolby Encoder. If the data rate of the Dolby
Encoder is lower than the setting in the D9054 HD Encoder the
audio will be passed through and only the actual bits in the data
stream will be used. The default rate is 192 kbit/s.
The external Dolby Encoder must be locked to the clock of the
D9054 HD Encoder. This can be achieved by connecting the Ref Out
(Reference Output) ports to the external encoder.
D9054 HDTV Encoder Intstallation and Operation Guide
/ ), with
m n
indicating the number of rear
n
Channel Format
Left, Right
(Left – Channel 1, Right – Channel 2)
Center
Left, Right, Center, Left surround, Right surround
.
2/0)
indicating the
m
4-17