GF82.62-P-3102-04SK Audio Gateway Control Unit, Function
GF82.62-P-3102-04SK Audio Gateway Control Unit, Function
- with CODE (525) MB Audio 50 APS radio
- with CODE (527) COMAND APS with single DVD drive (with navigation)
- with CODE (498) Japan version
The audio gateway control unit (N93/1) is the central audio communications interface within the media-oriented system transport (MOST).
Depending on the equipment, the control commands are initialized by the particular operating unit and transmitted via MOST to the audio gateway control unit (N93/1).
Scope of function:
^ Amplitude-modulated reception
^ Tone processing and amplification
^ Realization of communication between MOST and Controller
^ Area Network bus class B (interior) (CAN-B)
^ Diagnostic interface
Function conditions:
^ Circuit 15R ON
^ Authentication positive
^ No undervoltage or overvoltage
Amplitude-modulated reception
If the user selects a particular radio program on the operating unit, a request is sent to the audio gateway control unit (N93/1) via MOST whereupon the radio tuner generates a tuned circuit to receive the respective transmission frequency. The appropriate radio frequency signals (FM and MW) are filtered out and transferred to the integrated audio processing stage and audio amplifier stage by the radio receiver in the audio gateway control unit (N93/1).
Sound processing and amplification
The control commands coming in from the operating units for audio sound and volume control as well as all system component audio signals sent are transmitted via MOST to the audio gateway control unit (N93/1).
The integral audio processing and amplification stage digitizes and processes the incoming signals and amplifies them before outputting them to the speakers.
Variants of audio gateway control unit (N93/1)
The audio gateway control unit (N93/1) is supplied in versions "Basis" and with code (810) sound system. The expansion of the device mainly relates to final signal processing. The "Basic" version is the standard version of the audio gateway control unit (N93/1) with 4 ohms output stages and a rated output of 4 x 25 W and a speaker impedance of 4 ohms. The sound system has 5 speaker outputs with a rated output of 40 W each (with 2 ohms) and 2 with a rated output of 70 W each (with 4 ohms).
To expand the variation options in order to optimize the sound quality, the audio gateway control unit (N93/1), with code (810) Sound system is equipped with an expanded audio processing and amplification stage.
In vehicles with code (810) Sound system up to 31.8.06 the audio gateway control unit (N93/1) also reads in the sound amplifier microphone (B25/6).
Microphone input with code (810) Sound system, up to 31.8.06
The audio gateway control unit (N93/1) has a connection for the sound amplifier microphone (B25/6) that is used for automatic vehicle interior noise adaptation. The noise level in the vehicle interior is measured using the sound amplifier microphone (B25/6). The volume of the music output signal is continuously adapted to this noise level. In order to do this, the audio gateway control unit (N93/1) must be able to detect, which signals in the measured level are driving noise and which are audio signals. This takes place by comparing the output signal with the measured signal. A simple way of looking at it is to regard the difference in both signals as being the driving noise level.
Interfaces
The audio gateway control unit (N93/1) acts as an interface between the MOST and the CAN B. Data which are read in voltage-coded by the instrument cluster (A1) and stored on CAN-B can as a result be made available on the MOST.
Fault management of the MOST components
The audio gateway control unit (N93/1) is the central diagnostic interface for the entire MOST. During operation the system stored all faults that have occurred in non-volatile memory.
These faults can only be read out via STAR DIAGNOSIS. The inquiry is initiated via the 16-pin diagnostic connector of STAR DIAGNOSIS. Via the central gateway control unit (N93), the diagnosis data are transmitted directly to the CAN-B. The audio gateway control unit (N93/1) recognizes the diagnosis command and converts the incoming data into messages that are suitable for MOST. The diagnosis of all MOST components is controlled by the audio gateway control unit (N93/1).
Each MOST component has its own diagnostic trouble code memory.