GF82.85-P-2030SX Audio Mode, Function

GF82.85-P-2030SX Audio mode, function
- except CODE (498) Japan version
- except CODE (494) USA version
- Radio, CD

Component Identification:

Radio mode, function
After the COMAND controller unit as well as the COMAND display have been switched on by pressing the button "ON" (A40/9s6) at the front central operating unit and the "Radio" menu has been activated, the antenna structures in the rear window start receiving high frequency (RF [HF]) signals for ultra-short wave (FM [UKW]), short wave (KW), medium wave (MW), and long wave (LW). Modulated onto these HF signals are music, voice and data signals. The rear window antenna amplifier module filters the radio frequency band frequencies from the RF [HF] signals received, and amplifies these. The amplified signals are then forwarded to the 2 radio tuners in the audio tuner control unit via a coaxial line. The 2 radio tuners separate the useful information (audible frequencies) from the carrier signal (not audible). The demodulated audio signals are amplified and converted into sound signals by the vehicle speakers.

Antenna diversity, function
In the case of the "antenna diversity" function, reception-dependent switching over is carried out between the FM antennas of the rear window. The function is automatic and is carried out by the rear window antenna amplifier module. The 2 radio tuners in the audio tuner control unit merely generate the intermediate frequency (IF) signal, which serves as a reference for changing the FM antenna.

2-receiver technology function
The second (integrated) radio receiver in the audio tuner control unit automatically generates, after the COMAND controller unit is switched on, a list of the FM stations received, which is constantly updated during operation. This list appears, sorted alphabetically, when the "FM station list" menu is called up. The displayed stations can be activated through selection and confirmation.

The FM station list is only available, if the "Radio data system (RDS)" function is activated. If reception problems occur while driving, the COMAND controller unit tries to receive the selected station on an alternative frequency with the aid of the second radio receiver and then switches over accordingly if reception improves.

Certain programs of the various radio broadcasting companies are subdivided into regional programs at certain broadcasting times. Since the COMAND controller unit automatically switches to an alternative station frequency in case of reception interference, this may also lead to a change in the regional program.

RDS function
In addition to the radio program, many radio stations (FM) also broadcast additional non-audible digital information. Possible information is for instance the station name or alternate frequencies, on which the same program is broadcast.

This information is evaluated by the COMAND controller unit and is displayed on the COMAND display if the following requirements a re met:
^ An RDS station is tuned in.
^ The "RDS" function is activated

The 2 radio tuners in the audio tuner control unit also offer:
^ a station list of the currently most powerful FM stations in RDS mode
^ An automatic memory for the strongest AM stations
^ a selection by program type (e.g. pop, culture) for FM stations in RDS mode

Station selection options are:
^ automatic station search with scan function (the stations of one waveband are played for 8 s)
^ Station search on multifunction steering wheel (MFL)
^ Manual station search
^ Station selection using list of stations
^ Station selection using numeric keyboard
^ Station selection using frequency input
^ station selection from the memory (10 stations per waveband)

DVD and CD mode, function
The COMAND controller unit is equipped with an integrated CD/ DVD drive for playing audio and video CDs and audio and video DVDs. With code (527) COMAND APS with single DVD drive (with navigation), it is possible in addition to read navigation DVDs. In addition to playing back audio signals, the COMAND controller unit provides the following functions in DVD and CD mode:
^ "Random" function
All tracks on a CD or DVD are played according to the random principle.
^ "Repeat" function
A track, CD, or DVD can be repeated if required.
^ "Scan" function
The tracks on a CD or DVD are played for t = 8 s. After this has been run through completely, the scan function is automatically terminated.
^ "Select next/previous" function
The system only jumps forward or backward to the next or previous track; no audio signals can be heard in the process.
^ "Music search" function
The music that is being played is audible during music search. This enables certain sections of a track to be played or skipped.
^ "Track list" function
The desired track is selected with the aid of the front central operating unit on the COMAND display and confirmed.

In addition to the listed functions, supplemental information is shown on the COMAND display (e.g. playing time, track list and name of the performer).

DVD changer mode (with code (814) DVD changer)
The DVD changer is integrated in the COMAND controller unit and is operated via the COMAND controller unit.

The media that can be played in the DVD changer of the COMAND controller unit also include audio CDs and audio DVDs in MP3 format.