Grass Valley Imagestore 750 v.2.0.1 - Manual (Page 357)

Imagestore 750 User Manual Dolby Decode/Encode
Miranda Technologies Inc. Page 357
Dolby Metadata
Dolby Metadata contains information about the audio bit-stream and is
different for Dolby Digital and Dolby E.
•
Dolby E metadata contains a copy of the Dolby Digital metadata for
every program carried in the transport stream, as well as parameters
specific to the transport stream such as what audio configuration of
programs is being carried, for example 5.1 + 2.
•
Dolby Digital metadata contains data to be used by consumer
electronics, such as mix levels for down-mixing surround sound into
stereo.
Metadata can accompany the audio input into an Imagestore 750 and be
routed though, or it can be supplied separately for use directly at the audio
outputs. Metadata is routed through the Imagestore 750, connected between
various metadata sources and destinations. Metadata may be carried with the
audio within SDI or AES transport or separately on a RS485 serial
connection.
The Metadata handling includes:
•
AB switching of metadata synchronously with audio AB-mixer
•
RS485 serial metadata connections, flexible inputs and outputs
3
•
User-defined Metadata presets
•
Internal Metadata generation from selectable user-defined presets
•
Changing internally-generated metadata via automation
•
Flexible Metadata internal routing
Program Configuration
Each Dolby encoder/decoder deals with up to eight (8) mono audio channels.
A “program configuration” contains a set of audio “programs”, each of which
contains a number of audio “channels”. For example, the program
configuration “5.1 + 2” comprises of two audio programs (5.1 surround +
stereo) with a total of eight audio channels.
3
Please refer to page 278 for details of the RS485 ports