Grass Valley Imagestore 750 v.2.0.1 - Manual (Page 368)

Dolby Decode/Encode Imagestore 750 User Manual
Page 368 Miranda Technologies Inc.
The Dialogue Normalization parameter indicates the average dialog loudness
during the program. It is used by the section of the sound reproduction
system responsible for setting the reproduction level.
Mix Level
The mix level indicates the absolute acoustic sound pressure level of an
individual program during the final audio mixing session. The code
represents a value in the range 0 to 31. The peak mixing level is 80 plus the
value of mixlevel dB SPL, or 80 to 111 dB SPL. The peak mixing level is the
acoustic level of a sine wave in a single channel whose peaks reach 100
percent in the PCM representation. The absolute SPL value is typically
measured by means of pink noise with an RMS value of 20 or 30 dB below
the peak RMS sine wave level. The value of the mix level is not typically
used within the AC-3 decoder, but may be used by other parts of the audio
reproduction equipment.
Room Type
The room type indicates the relative size and monitor frequency response
curve of the mixing room used for the final audio mixing session. The room
type value is not typically used by the AC-3 decoder, but may be used by
other parts of the audio reproduction equipment.
•
Not indicated
•
Large room, X curve monitor
•
Small room, flat monitor
Dolby Mix Mode
The preferred stereo down-mix mode setting indicates the type of stereo
down-mix preferred by the mastering engineer. This information may be used
by the AC-3 decoder to automatically configure the type of stereo down-mix,
but may also be overridden or ignored.
•
Not indicated
•
Lt/Rt downmix preferred
•
Lo/Ro downmix preferred