Specifications

Model DP579 Dolby Tri-Level Sync Interface
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1 Introduction
Postproduction is migrating towards 24-frame acquisition and storage
to give high quality and flexibility across multiple delivery formats.
The DP579 Dolby E Tri-Level Sync Interface allows high-quality
Dolby E multichannel audio and metadata to be stored on these
24-frame systems using the DP571 and DP572 Dolby E encoder and
decoder. Applications for the DP579 include DTV postproduction,
electronic cinema, telecine, and archiving.
The DP579 converts tri-level video sync into a specific reference
signal (which we have termed Dolby Black) that can be used by
existing Dolby E equipment. The DP579 also accepts traditional
NTSC and PAL program and black reference. The DP579 enables a
pair of Dolby E codecs to operate at 23.98, 24, and 30 fps in addition
to 25 and 29.97 fps. Please note that this requires a software upgrade
for the Dolby E codecs; the new software is included with the DP579.
The DP579 includes a loop-through for the input video reference
signal, and two Dolby Black outputs. Front-panel LEDs indicate power,
tri-level or composite sync presence, as well as error and fault conditions.
Its convenient half-rack width allows a single DP579 to be installed
alongside (or behind) existing DP571 and DP572 units. A rack-mount
kit (Cat. No. 546) is also available that allows two units to be mounted
side by side for redundancy or to drive multiple Dolby E codecs.
1.1 Dolby Black
Dolby Black is a bi-level, interlaced reference signal consisting of
sync information only. It contains between 500 and 700 lines, and is
compatible with the video front end of the DP570, DP571, DP572, and
other Dolby products. Dolby Black is a non-standard reference signal,
intended for use only with Dolby products, and should not be used as a
reference generator for other equipment.
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