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Dolby Model DP583 Frame Synchronizer User’s Manual Front-Panel Menus

4-5

4.3.2 I/O Control

The I/O Control menu allows configuration of the. DP583’s inputs and outputs.

The submenus are:

• Clock Source

• TTL Input

• PCM Attenuation

• Bypass Mode

Clock Source

The selected clock source is used as the clock reference to lock the output AES audio

signal. The choices are Video Ref, Digital Input, or AES Ref. A video reference is

required to lock and synchronize Dolby E signals, and either an AES or video

reference is required to synchronize Dolby Digital and PCM audio signals. If the

clock source is set to Digital In, the DP583 can be used as a simple delay line with

any audio format.

TTL Input

The TTL Input activates the TTL tracking input for use when synchronizing PCM

audio. This allows the DP583 to track its audio delay to match the delay through an

associated video frame synchronizer. The setting has no effect when processing

Dolby E or Dolby Digital audio.

In distribution or backhaul applications it is usual to incorporate a video frame

synchronizer in the video path to re-frame the video to local reference. As the delay

through a video frame synchronizer varies depending on timing differences between

the signal and reference to maintain lip sync, it is necessary for an associated audio

frame synchronizer to follow this delay. The standard method for linking audio

synchronizers to video synchronizers is the TTL tracking pulse.

PCM Attn

The PCN Attn menu allows PCM audio signals being processed by the DP583 to be

reduced in level. This allows for simple level matching between PCM and coded

audio sources. The menu shows the amount of attenuation in dB. The setting has no

effect when processing Dolby E or Dolby Digital audio.

Bypass Mode

When enabled, the Main Output is directly connected to the Bypass Input via a relay.

4.3.3 System Settings

The System Settings menu gives you access to submenus controlling communication

with other devices, and for upgrading software.

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Dolby Laboratories DM100 Bedienungsanleitung Seite 31