Operating the Equipment Locally: Audio Menu – Dolby Digital (AC-3)
Page 4-74
Reference Guide: Voyager E5784 and E5788 HD DSNG Encoder
ST.RE.E10137.3
Bit Stream Mode Option
This option sets the bit-stream mode that is signalled in the bit-stream. It
is used to indicate the type of service the bit-stream conveys.
Table 4.69: Bit Stream Mode Options
Selected Option
Description
Complete Main
Music & Effects
Visually impaired
Hearing impaired
Dialogue
Commentary
Emergency
Reserved
Voice Over/Karaoke
In Dolby Digital when the coding mode is 1/0 this option
appears as ‘Voice Over’ otherwise as ‘Karaoke’.
Dialogue Level Option
This option sets the dialogue level that the Encoder will signal in the
bit-stream. The dialogue level indicates how far the average dialogue level
is below digital 100%. It is not used by the AC-3 decoder, but may be used
by other parts of the sound reproduction system.
Table 4.70: Dialogue Level Options
Selected Option
Description
–1 dB to –31 dB
Dialogue levels between –1 dB to –31 dB.
Dolby Srnd Mode Option
This option is only available if the coding mode is 2/0(L,R). It determines
whether the bit-stream is signalled as conveying a Dolby Surround
encoded program or not. This information is not used by the AC-3
Decoder, but may be used by other parts of the sound reproduction
system.
Table 4.71: Dolby Srnd Mode Options
Selected Option
Description
Not indicated
It is not known if the bit-stream is conveying a Dolby Surround
encoded program.
Not Dolby Surround
The bit-stream is not conveying a Dolby Surround encoded
program.
Dolby Surround
The bit-stream is conveying a Dolby Surround encoded
program.
Production Info Option
This option indicates whether the Mixing Level and Room Type parameters
exist within the bit-stream.
