Dolby Laboratories Multichannel Audio Tool DP570 - Manual (Page 105)

Dynamic Range Control Profiles
Dolby ® DP570 Multichannel Audio Tool User’s Manual 89
In some situations it may be necessary to further constrain signal peaks above the average
dialogue level so that there is less than 20 dB headroom. The selection of a suitable RF mode
profile achieves this.
D.4 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 D‐2 .
Figure D‐2
Figure D-2 DRC Profile
In each case, the center of the null band is assigned to the region surrounding or adjacent
to the Dialogue Level parameter setting, and the DRC profile is applied in relation to that
level. Here are the details of the range for each profile.
• Film Light
Max Boost: 6 dB (below –53 dB)
Boost Range: –53 to –41 dB (2:1 ratio)
Null Band Width: 20 dB (–41 to –21 dB)
Early Cut Range: –26 to –11 dB (2:1 ratio)
Cut Range: –11 to +4 dB (20:1 ratio)
• Film Standard
Max Boost: 6 dB (below –43 dB)
Boost Range: –43 to –31 dB (2:1 ratio)
Null Band Width: 5 dB (–31 to –26 dB)
Early Cut Range: –26 to –16 dB (2:1 ratio)
Cut Range: –16 to +4 dB (20:1 ratio)
• Music Light
(No early cut range)
Max Boost: 12 dB (below –65 dB)
Boost Range: –65 to –41 dB (2:1 ratio)
Null Band Width: 20 dB (–41 to –21 dB)
Cut Range: –21 to +9 dB (2:1 ratio)
• Music Standard
Max Boost: 12 dB (below –55 dB)
Boost Range: –55 to –31 dB (2:1 ratio)
Null Band Width: 5 dB (–31 to –26 dB)
Early Cut Range: –26 to –16 dB (2:1 ratio)
Cut Range: –16 to +4 dB (20:1 ratio)
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