Dolby Laboratories DP564 - Manual (Page 83)

DP564 Multichannel Audio Decoder Appendix A: Metadata
A-13
LFE Channel
The status of the LFE Channel parameter indicates to a Dolby Digital encoder
whether an LFE Channel is present within the bitstream. Channel Mode determines
whether the LFE Channel parameter can be set. You must have at least three channels
in order to be able to add an LFE channel.
LFE Channel Setting
Enable
Disable
Bitstream Mode
This parameter describes the audio service contained within the Dolby Digital
bitstream. 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 using a maximum total bit rate of 512 kbps. Refer to the Guide
to the Use of the ATSC Digital Television Standard, Document A/54 (www.atsc.org)
for further information. Although a detailed description of each option follows, in
practice most programming uses the default setting, Complete Main. An example of
an exception to this rule is a special karaoke DVD, or an emergency service within
digital television.