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Audio mode, function - GF82.85-P-2030CWC

MODEL 204.0 with CODE (494) USA version 

Function requirements 

Function sequence for audio mode in general 

The audio mode is made up of the following subfunctions:

Operating instructions 

Audio functions are operated or selected or adjusted using the following components:

Function sequence for radio mode (AM/FM) 

The antennas in the rear window receive high frequency (HF) signals for the FM and AM (MW, LW) radio frequency bands. The following useful signals relevant for radio reception are modulated onto these HF signals:

The HF signals are routed over discrete lines to the FM, AM and CL [ZV] antenna amplifier (A2/18) as well as the rear window antenna FM antenna amplifier (A2/19). These two amplifiers filter the frequencies of the radio frequency bands out of the received HF signals and amplify them. The amplified signals are then transmitted over coaxial lines (FM, AM) to the tuners integrated into the radio where they are demodulated. The demodulated audio signals for vehicles with code (810) Sound system are routed from the radio over the Media Oriented System Transport (MOST) to the sound system amplifier control unit (N40/3) and finally amplified.

Audio output then takes place over discrete lines through the following speakers:

IMPORTANT For vehicles except code (810) Sound system, audio output takes place over discrete lines directly from the radio via the following speakers:

The function sequence for radio operation is made up of the following subfunctions:

AM tuner (MW, LW) function

For the MW and LW radio frequency bands the useful signals are transmitted by means of amplitude modulation (AM). The AM tuner integrated into the radio demodulates these signals. In other words, it separates the useful signals (audible frequencies) from the carrier signal (inaudible).

FM double tuner with phase diversity (FM) function

For the FM radio frequency band the useful signals are transmitted by means of frequency modulation (FM). The FM double tuner integrated into the radio demodulates these signals. In other words, it also separates the useful signals (audible frequencies) from the carrier signal (inaudible).

The radio also performs a reception-specific switchover between the two antenna amplifiers. This function runs automatically.

RBDS function

Digital, inaudible information such as the name of the station, type of program (PTY) (e.g. pop, classic) are evaluated by the radio and displayed on the audio/COMAND display (A40/8).

Function sequence for audio CD and MP3 (on CD) 

A CD player is integrated into the radio. The CD drive reads in the audio CDs (also in MP3 format) and they are internally processed by the radio. The user navigation for controlling the CD functionality (e.g. track selection) and for displaying any supplemental information (e.g. track) is shown on the audio/COMAND display. For vehicles with code (810) Sound system, data exchange takes place between the radio and the sound system amplifier control unit over the MOST.

The audio output is then forwarded directly over discrete lines by the radio to the following speakers:

IMPORTANT For vehicles except code (810) Sound system, audio output takes place over discrete lines directly from the radio via the following speakers:

Satellite digital audio radio (satellite radio) (SDAR) function With code (536) SIRIUS satellite radio GF82.60-P-3021CWA
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