Dolby Laboratories DP564 - Manual (Page 78)

DP564 Multichannel Audio Decoder Appendix A: Metadata
A-8
Dynamic Range Control Profiles
Six preset DRC profiles are available to content producers: Film Light, Film
Standard, Music Light, Music Standard, Speech, and None. Each is applied in
the pattern shown in Figure A-2. All DRC profiles are encoded using a modified
B-weighted curve.
Input Level Low High
Boost
Range
Null
Band
Centered at
the Dialogue
Level Setting
Cut
Range
Cut
Range
Early
Dialogue Level
Setting
Low
Hi
g
h
Un
ity
Ga
in
O
u
put
Lev
el
Figure A-2 DRC Profile Pattern
In each case the center of the null band is assigned to the dialogue level parameter
setting, and the DRC profile is applied in relation to that level.
• Film Light
Max Boost: 6 dB (below –53 dB)
Boost Range: –53 dB to –41 dB (2:1 ratio)
Null Band Width: 20 dB (–41 dB to –21 dB)
Early Cut Range: –26 dB to –11 dB (2:1 ratio)
Cut Range: –11 dB to +4 dB (20:1 ratio)
• Film Standard
Max Boost: 6 dB (below –43 dB)
Boost Range: –43 dB to –31 dB (2:1 ratio)
Null Band Width: 5 dB (–31 dB to –26 dB)
Early Cut Range: –26 dB to –16 dB (2:1 ratio)
Cut Range: –16 dB to +4 dB (20:1 ratio)
• Music Light (No early cut range)
Max Boost: 12 dB (below –65 dB)
Boost Range: –65 dB to –41 dB (2:1 ratio)
Null Band Width: 20 dB (–41 dB to –21 dB)
Cut Range: –21 dB to +9 dB (2:1 ratio)