Inc. Home Theater System User Manual

Dolby E Multichannel Distribution System User Manual DP571 Dolby E Encoder

3-4

3.1.7 Main Out

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 outputs are electrically separate, not passive loop-through

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

3.1.8 PCM Delay Out

Encoding delay is added to the PCM signal transmitted from the PCM Delay Out

connector. The DSP subsystem calculates the delay equivalent to the main channel latency

and applies it to the PCM Delay Out.

3.1.9 Status

General Purpose Input/Output (GPI/O) signals for the DP571 are available from the

Status port, a female DB-9 connector. The input and output signals are 0 – 5 V TTL.

The pin configuration is defined in the table below:

Table 3-1

DP571 Status port pin functions

Using the Status Port to Select Presets

The two inputs on pins 7 and 8 select among the first three (of eight) presets stored in

the DP571. The inputs are normally high (internal pull-up) and trigger a preset recall by

sensing a momentary high-to-low transition. A momentary contact closure between

pins 7 and 9 (ground) or pins 8 and 9 is sufficient to activate a function but a held closure

also works. A low-to-high transition (i.e., a switch release) is ignored. Table 3-2

summarizes the operation of the two inputs.

Pin Connection Explanation

1 Preset Tally A Preset tally output

2 Reference Video Valid

: Valid;

: Ref video error

3 Dolby E Encoding Valid

: Valid;

: Encoding error

4 System Operational

: Functional;

: Failed

5Fault

: Functional;

: Hardware fault

6 Preset Tally B Preset tally output

7 Preset Ctrl A Preset control input

8 Preset Ctrl B Preset control input

9 Ground