Dolby E Multichannel Distribution System User Manual DP572 Dolby E Decoder
4-3
4.1.1 Main In
A Dolby E encoded signal is applied to Main In, sent to an AES3 receiver, then passed
to the DSP subsystem for decoding. A PCM signal can also be input to Main In and
passed directly to Digital Outputs 1/2. The DP572 automatically detects whether the
Main In signal is Dolby E or PCM.
4.1.2 Video Reference
An analog composite video reference signal is required for Dolby E decoding. Versions
1.05 and later support two frame rates: 29.97 Hz (NTSC) and 25 Hz (PAL).
If the video reference signal is not present or invalid, the:
• DP572 will stop decoding the Dolby E bitstream;
• PCM outputs on the decoder will be muted;
• VRef LED will be red (Vref not present) or yellow (Vref unequal to frame rate
of Dolby E Main Input).
4.1.3 PCM Input
A separate PCM signal can be applied to the PCM Input and transported in parallel with
the Main In signal. A delay equal to the main channel latency is added to the PCM signal.
4.1.4 Remote
Future versions of the DP572 will permit remote control through the front- (RS-232)
or rear-panel (RS-485) remote ports.
4.1.5 Auxiliary
The RS-485 auxiliary port will be implemented in future versions.
4.1.6 10BASE-T
This port will be implemented in future versions.
4.1.7 Metadata
Dolby Digital metadata is extracted from the Dolby E bitstream and sent out the metadata
port. This port can be connected to the DP569 Dolby Digital Multichannel Encoder
(software must be version 1.21 or later).