Dolby Laboratories DP564 - Manual (Page 84)

DP564 Multichannel Audio Decoder Appendix A: Metadata
A-14
Bitstream Mode
Setting
Definition
Complete Main
(CM)
CM flags the bitstream as the Main Audio Service for the program and all
elements are present to form a complete audio program. Currently, this is
the most common setting. The CM Service may contain from one (mono)
to six (5.1) channels.
Main M&E (ME)
The bitstream is 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.
Assc. Visual Imp.
(VI)
This is typically 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.
Assc. Hear Imp. (HI)
This is typically 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.
Assc. Dialogue (D)
This is typically a single-channel program intended to provide a dialogue
channel for an 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).
Assc. Commentary
(C)
This is typically 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.
Assc. Emergency
(E)
This is a single channel service that is given priority in reproduction.
When the E Service appears in the bitstream, it is given priority in the
decoder and the Main Service is muted.
Assc. Voice Over
(VO)
This is a single channel service intended to be decoded and mixed to the
center channel (requires special decoders).
Main Sv Karaoke
(K)
The bitstream is a special service for karaoke playback.
Line Mode Compression Profile
Line Mode is discussed in Section A.3, Dynamic Range Control.
RF Mode Compression Profile
RF Mode is discussed in Section A.3, Dynamic Range Control.