7800/7700 MultiFrame Manual
7812UDXD Series 3G/HD Up/Down/Cross Converter with Simultaneous Dual Format Outputs and AES I/O
Page - 98
Revision 1.1.1
6.31.2. Program 1
6.31.2.1. Bitstream Mode
This control enables the user to set the bit-stream mode for Program 1. This parameter describes the
audio service contained within the Dolby bit-stream. A complete audio program may consist of a main
audio service (a complete mix of all the program audio), an associated audio service comprising a
complete mix, or one main service combined with an associated service. To form a complete audio
program, it may be (but rarely is) necessary to decode both a main service and an associated service. An
example of an exception to this is an emergency service within a digital television program. Most
programming typically uses Complete Main (CM) as its setting.
CM
CM
flags the bit-stream as the main audio service for the program and indicates that all
elements are present to form a complete audio program. This is the most common setting.
The CM service may contain from one (mono) to six (5.1) channels.
ME
ME
flags the bit-stream as the main audio service for the program, minus a dialogue
channel. The dialogue channel, if any, is intended to be carried by an associated dialogue
service. Different dialogue services can be associated with a single ME service to support
multiple languages.
VI
VI
flags the bit-stream as a single-channel program intended to provide a narrative
description of the picture content to be decoded along with the main audio service. The VI
service may also be a complete mix of all program channels, comprising up to six channels.
HI
HI
flags the bit-stream as a single-channel program intended to convey audio that has been
processed for increased intelligibility and decoded along with the main audio service. The HI
service may also be a complete mix of all program channels, comprising up to six channels.
D
D
flags the bit-stream as a single-channel program intended to provide a dialogue channel
for a ME service. If the ME service contains more than two channels, the D service is limited
to only one channel; if the ME service is two channels, the D service can be a stereo pair.
The appropriate channels of each service are mixed together (requires special decoders).
C
C
flags the bit-stream as a single-channel program intended to convey additional
commentary that can be optionally decoded along with the main audio service. This service
differs from a dialogue service because it contains an optional, rather than a required,
dialogue channel. The C service may also be a complete mix of all program channels,
comprising up to six channels.
E
E
flags the bit-stream as single-channel service that is given priority in reproduction. When
the E service appears in the bit-stream, it is given priority in the decoder and the main
service is muted.
VO
VO
flags the bit-stream as a single-channel service intended to be decoded and mixed to the
Center channel (requires special decoders).
