Dolby Laboratories DP524 Manual de usuario descargar pdf (Pagina 36)

DP571 Dolby

E Encoder User’s Manual Hardware Description

6.2.4 Main Out Connectors

The encoded Dolby E bitstream is output from the rear-panel Main Out connector as

an AES3 coaxial digital signal. Two connectors are available for transmission of

Dolby E data to multiple decoders or monitoring units.

Note: The two Main Out connectors are electrically separate, not passive loop-

through connections, so there is no need to terminate an unused output.

6.2.5 Video Ref Connectors

The DP571 requires a video reference signal to lock the audio and video at frame

boundaries.

The DP571 supports the following frame rates:

• 29.97 Hz

• 25 Hz

• 23.98 Hz

• 24 Hz (P or PsF)

• 30 Hz

For the 29.97 and 25 Hz frame rates, standard black burst or color bars locked to the

plant reference can be used as a video reference. All other frame rates require a Dolby

DP579 Tri-Level Sync Interface to convert tri-level reference signals into Dolby

Black (a signal similar to standard black burst that is compatible with the DP571). In

addition, vertical interval timecode (VITC) information can be extracted from a 25 or

29.97 fps composite video reference signal sent to the DP571. The video reference

can be either terminated at the loop-through connection, or passed on to additional

devices.

Note: The reference signal must be terminated with a 75Ω impedance on the last

device in the signal chain.

If a suitable video reference signal is not present or invalid, the:

• DP571 does not encode a Dolby E bitstream.

• Dolby E output on the Main Output and PCM Output are muted.

• VRef LED is yellow if the wrong frame rate reference is present, and red if no

valid reference is present.

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Dolby Laboratories DP524 Manual de usuario Pagina 36