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Dolby Model DP583 Frame Synchronizer User’s Manual

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Chapter 1

Introduction

Terrestrial broadcast, cable, and satellite facilities routinely need to synchronize

externally generated audio and video signals to match their internal plant video

reference, or to pass them through different distribution systems, such as a cable head-

end. The DP583 accepts all Dolby E and Dolby Digital bitstreams, as well as PCM

audio, and provides an output that is synchronized to match the local plant reference.

The DP583 also allows postproduction facilities to reframe Dolby E streams that have

been stored on recorders without video frame reference capabilities (such as DAT,

hard-disk, or PC recorders), so they can be recorded to VTRs or servers.

The DP583 can operate with both a tracking and a fixed delay, up to a maximum of

310 ms for each audio format. The output clock can be derived either from a video

black reference or an AES reference. When tracking with Dolby E, the video

reference provides framing information; when tracking with PCM, a standard TTL

input signal compatible with most video frame synchronizers can be used. The DP583

also monitors the quality of Dolby E or Dolby Digital bitstreams as they pass through

the unit and logs any errors.

The front panel of the DP583 features a two-line, 16-character, alphanumeric display

and menu navigation buttons to facilitate operation of the status and setup menus. The

DP583 displays the incoming bitstream type (Dolby E, Dolby Digital, or PCM),

program configuration, and the current delay through the unit. Any buffer drops or

repeats are counted and stored for subsequent retrieval.

Front-panel LEDs indicate presence of input and reference signals, power-supply

status, and error or fault conditions. These are mirrored on the GPI/O status port. An

RS-232 connector on the front panel and RS-485 connector on the rear panel are

available for software upgrades and status monitoring.

The DP583 contains dual redundant power supplies with individual power inlets for

fail-safe operation in broadcast critical paths.

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Dolby Laboratories DM100 Instrukcja Użytkownika Strona 11