Inc. Program Optimizer Manual

Table Of Contents

Profile Descriptions

Dolby

DP600 Program Optimizer Manual 69

B.2 Profile Descriptions

FollowingaredescriptionsofallthecurrentDP600profiles.Profilesthatperform

encoding,decoding,andtranscodingfunctionsrequiretheDP600‐C.

Profile: AC3_AC3-1 Æ Dolby Digital (AC-3) Speech-Based Loudness Correction

via Metadata

ProfileAC3_AC3‐1correctsthemetadatavalues(dialnorm,dynrng,and compr)withinthe

.ac3fileifthemeasureddialogueloudnessisgreater thantheoriginaldialogue

normalizationvalueby±1dB.

Profile: AC3_AC3-2 Æ Dolby Digital 2/0 to 5.1 (adaptive) Upmix with Loudness

Correction

ProfileAC3_AC3‐2automaticallyupmixes2/0(stereo).ac3filesto3/2L.ac3(at384kbps),

andalsocorrectsthemetadatavalues(

dialnorm,dynrng,andcompr)ifthemeasured

dialogueloudnessisgreaterthantheoriginaldialnormvalueby±11dB.

Note: DP600profilesareupdatedperiodically.ForthelatestDP600profiles,pleasegoto

theDP600areaonwww.dolbysupport.com.

Note: Thisprofilealsosupports1/0,3/2,and3/2L.ac3 sourcefiles,whichonlypass

throughtheloudnessanalysisandcorrectionprocesses(thatis,theupmixeris

adaptivelybypassedinsuchcases).

.ac3 file

Process Æ Loudness estimate & correction

Measurement type Æ Speech-based ITU-R BS.1770

.ac3 file

Process Æ Upmix 2/0 AC-3 to 3/2L AC-3 with

Loudness estimate & correction

NOTE: .ac3 files with 1/0, 3/2, & 3/2L acmod types

are supported w /o upmixing

(i.e. Loudness estimate & correction ONLY )

Measurement Type Æ Speech-based ITU-R BS.1770

.ac3 file