Table d-4 – Dolby Laboratories DP570 User Manual
Page 106
94
Dolby
®
DP570 Multichannel Audio Tool User’s Manual
A Guide to Dolby Metadata
Parameter Definitions
Dialogue Level
The Dialogue Level parameter is discussed in
Channel Mode
This parameter (also known as Audio Coding mode) indicates the active channels within the
encoded bitstream and affects both the encoder and consumer decoder. This parameter
instructs the encoder which inputs to use for this particular program; it tells the decoder
what channels are present in this program so the decoder can deliver the audio to the
correct speakers.
The setting is described as X/Y, where X is the number of front channels (Left, Center,
Right) and Y the number of rear (Surround) channels.
The availability of certain channel modes depends on the Dolby Digital encoder data rate
and whether the LFE channel is present. For example, you can’t have a mono stream with
an LFE channel (1.1) or a 3/2 stream at 96 kbps. Appropriate data rates are shown in the
definition of each setting.
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
Note: The presence of the LFE channel is indicated by a the LFE Channel parameter.
Table D-4 Channel Mode Definition and Data Rates
Channel Mode
Setting
Definition and Data
Rate
1+1
Dual mono (not valid for
DTV broadcast or DVD
production)
1/0 Mono
From 56 kbps, usually 96
kbps
2/0 Stereo
From 96 kbps, usually 192
kbps
3/0
From 256 kbps
2/1
From 256 kbps
3/1
From 320 kbps
2/2
From 320 kbps
3/2
From 384 kbps, often 448
kbps