Apple Compressor 2 - Manual (Page 97)

Chapter 7 Creating Dolby Digital Professional Output Files 97
 Dialog Normalization: Specifies the average volume of the dialog in your sound files
relative to full modulation. The playback device uses this information to maintain
similar volume among different AC-3 streams. A setting of –31 dBFS ensures the
sound levels will not be altered at all.
 Enable Low Frequency Effects: Select this checkbox to include the LFE channel in the
encoded stream. (Not available for mono or stereo.)
Bitstream Tab Settings
These settings are stored in the finished stream for use by the playback device. Leave them
at their default values unless you have a specific technical reason for changing them.
 Center Downmix, Surround Downmix: If your encoded audio has these channels, but the
player does not, the channels are mixed into the stereo output at the specified level.
 Dolby Surround Mode: When encoding in 2/0 (stereo) mode, specifies whether the
signal uses Dolby Surround (Pro Logic).
 Copyright Exists: Select this checkbox to specify that a copyright exists for this audio.
 Content is Original: Select this checkbox to specify that this audio is from the original
source and not a copy.
 Audio Production Information: Select this checkbox and fill in the fields below to
specify how the encoded audio content was mixed. Playback devices may use this
information to adjust output settings.
 Peak Mixing Level: Specifies peak sound pressure level (SPL) (between 80 dB and
111 dB) in the production environment when this mix was mastered.
 Room Type: Specifies information about the mixing studio.