Activating/accepting call, function - GF82.70-P-2000M

MODELS 215.3, 220.0 /1 as of 1.9.03 with CODE (813) Voice control system (VCS) 

Shown on model 211 

Fig 1: Identifying Activating/Accepting Call Function - Shown On Model 211

Function activation 

The actuation of the voice control system switch (S93/2) in driver direction is read in by the steering column module (N80) and the corresponding message is transmitted on the CAN-B (Controller Area Network bus Class B (interior)) to the audio gateway control unit (N93/1). The audio gateway control unit (N93/1) then transmits the actuation message via the MOST (Media Oriented System Transport) to the voice control system control unit (A35/11), which activates the integrated voice recognition of the voice control system. This is announced to the user through an acoustic signal (beep). At the same time, the hands-free system is activated and the radio muted to ensure the greatest possible accuracy of the user input. By using the appropriate input commands, the user can select and operate telephone, radio, CD player, CD changer, cassette deck, and navigation. The spoken commands are received by the hands-free system microphone group (A67/b1) and forwarded in a conventional way to the voice control system (A35/11). This system processes the voice input of the user while taking the ambient noise into account (e.g., wind noise, tire rolling noise). If an entry is not made immediately, the hands-free system microphone is switched to a more sensitive setting. If there still is no entry, the VCS is deactivated after approx. 15 s.

Accepting call 

An incoming call can be received via the accept/terminate phone call button (S111s3) at the multifunction steering wheel. As during activation, the radio is also muted here to ensure the greatest possible stability of the user voice input. The user can immediately hold the phone conversation via the hands-free system microphone group (A67b1). In this case, the system voice output is accomplished via the handsfree system loudspeakers.

For echo compensation the VCS requires the data from the telephone fixed-line network, which is made available to the VCS via the MOST. The processed and digitized microphone data are read in by the VCS and made available on the MOST. They can then be read by the telephone control unit.

In order to achieve a very good hands-free call quality, the telephone has to switch off its own hands-free call processes (echo compensation, noise compensator, and noise reduction).