Grass Valley Imagestore 750 v.2.0.1 - Manual (Page 374)

Dolby Decode/Encode Imagestore 750 User Manual
Page 374 Miranda Technologies Inc.
Profile
This field indicates the RF compression word of the AC-3 bitstream
associated with the specified program.
The setting allows the program provider (or broadcaster) to implement a
large dynamic range reduction (heavy compression) in a way which assures
that a monophonic downmix will not exceed a certain peak level. The heavily
compressed audio program may be desirable for certain listening situations
such as movie delivery to a hotel room, or to an airline seat. The peak level
limitation is useful when, for instance, a monophonic downmix will feed an
RF modulator and over modulation must be avoided.
A compression profile is one of the following:
•
None
•
Film, Standard
•
Film, Light
•
Music, Standard
•
Music, Light
•
Speech
Dynamic Range Tab
Each audio “program” (see page 365) carried within a Dolby E stream has a
stream of dynamic range control profiles associated with it. The dynamic
range is composed of the profile to which the value applies (value between 1
and 8), and the actual dynamic range profile value:
•
None
•
Film, Standard
•
Film, Light
•
Music, Standard
•
Music, Light
•
Speech