Signal Processing Module: Description and Operation

GF82.62-P-5000RC Digital Audio Broadcasting Control Unit, Component Description
- with CODE (537) Digital radio
- with CODE (833) Great Britain version

Component Identification:

Location
The Digital Audio Broadcasting control unit is located on the crossmember in the trunk under the trunk mat.

Depending on the equipment version, one of the following audio devices is installed (hereinafter called "Audio unit"):
- Radio (A2), with code (510) Audio 20 including CD changer
- Radio and navigation unit (A2/56), with code (525) MB Audio 50 APS radio or with code (511) Audio 50 APS with DVD changer
- COMAND operating, display and controller unit (A40/3), with code (527) COMAND APS with single DVD drive (with navigation) or with code (512) COMAND APS with DVD changer

Task
^ Receiving signals
^ Decoding of signals
^ Transmitting signals

Receiving signals
Discrete lines
- Power supply via circuit 31 and circuit 30g over one direct line each
- Electronic wake-up for Media Oriented System Transport (MOST) via one direct line
- DAB L-band signals over coaxial cable from DAB L-band antenna (A95/1)
- DAB band III signals over a coaxial line and the left antenna amplifier module (A2/64) from the rod antenna (A28)

Decoding of signals
The Digital Audio Broadcasting control unit decodes the DAB L- band signals and DAB band III signals to obtain PCM (Pulse Code Modulation) signals.

Transmitting signals
MOST
- Pulse Code Modulation PCM signals:
- Audio signals to sound system amplifier (N40/3), with code (810) Sound system
- Audio signals to "Audio unit", except code (810) Sound system

- DAB status and station lists to "Audio unit"
- Phantom voltage via a coaxial line to the DAB L-band antenna