first generation system (from about half megabyte to twenty megabytes). The algorithms used in the system were developed at Ulm, Germany where what was then called DaimlerChrysler Research and Technology center was located in addition to other groups within the company. The system listens to the person's voice and records frequencies which are then analyzed by a computer and its software. The system looks for patterns called phonemes to understand what the person is saying, a process which it computes in milliseconds. What system the voice command can control can depend on the model year. In 2000, it could control the car phone, the radio, and the CD player (if installed) but in 2002 the navigation system was also added to its domain. An original goal of the Linguatronic system was to allow essentially hands-free control of interior systems, especially the car phone by using spoken words. This means there is microphone (located in the W220 S-Class) that can listen to the person; one of the issues is hearing the person over background noises and echos. The Linguatronic system used digital pre-processing to support this task. The features is run from hardware in a separate box in the back of the car. Suspension technologies The W220 featured two new suspension systems - an air suspension and a hydropneumatic suspension system. The Airmatic air system has an Adaptive Damping System (ADS) which adjusts the shock absorbers to difficult road conditions. Drivers can select a comfort or two sports suspension programmes as well as increased ride height (+25 mm) via switches on the dash. The increased ride height is automatically canceled after 5 minutes of 55 MPH driving or manually through driver's input. The electronically controlled hydropneumatic Active Body Control (ABC) system is technically more advanced than Airmatic and keeps the car level even in fast corners, provides a comfort and sports setting. Also, just like Airmatic equipped vehicles, the ride height can be raised by using a button (2 settings, compared with Airmatic's single setting), increasing ground clearance for driving on difficult terrain such as roads with deep ruts or snow. Prior to September 2002, only higher end models (e.g. S 600, which only was available with ABC) lowered themselves automatically at higher speeds by 15 mm in order to achieve greater stability (lower center of gravity) as well as better fuel efficiency through a slightly improved aerodynamic drag coefficient. As