Grass Valley Imagestore 750 v.3.0.1 - Manual (Page 131)

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Imagestore 750
User Manual
Down-Mix Options
Lo/Ro (Left-only/Right-only) is a down-mixed stereo signal created from 5.1 audio signals that is
fully stereo and mono compatible with very few side effects, but loses front-rear audio
information.
Lt/Rt (Left-total/Right-total) is a down-mixed stereo audio signal created from 5.1 audio signals
that keeps some front-rear audio information.
(See also ‘Modes & Levels’ Tab on page 127 and Features Tab on page 131.)
 Note: Lt/Rt down-mix is not available for Dolby decoding because this mode is broken in the
module’s firmware.
Dolby E Encoder Module
(The part number is CAT559E.)
This module provides Dolby E encoding. The module accepts up to 8 channels of audio, as well
as a metadata bitstream. The module outputs a stereo pair containing either encoded Dolby E,
or PCM when it is in pass-through mode:
Fig. 6-10: Dolby CAT559E Encoder module Input/Output
Fig. 6-11: Imagestore 750 Configurator - Audio Graph Dolby Encoder representation
The delay through the module is 1 frame. You should apply an appropriate video delay to
compensate for it.
Oxtel automation commands exist for controlling the module’s encoding modes. (See Automa-
tion Control on page 119.)
The following encode modes are supported:
Encode Audio is encoded.
Pass-through Audio is passed through the module.
Follow decoder The encoder follows a decoder’s decode status. (When it decodes, the
encoder will encode.)
E
8 audio ch. Dolby E, 2 audio ch.
1 Frame
Delay
Metadata