A graphical display apparatus for motor vehicles. The infrared identification system includes a seed introduction system, in each friendly vehicle, that introduces trace quantities of a particular seed formulation into the vehicle’s exhaust. The second link and the third link are provided with rail portions respectively. The panels are provided with opposite first retaining profiles that are configured in such a manner that on a panel being in first line a new panel can be locked in second line by attaching the new panel to the installed panel at a temporary angle relative to the installed panel and then swiveling it down into the plane of the installed panel. The spectral characterization method is implemented using a spectral measurement instrument having an adjustable measurement bandwidth. A phoneme segmenting part 4 connects the voice data labeled with the same kind of phonemic data, and a formant extracting part 5 specifies the frequency of formant of each piece of phonemic data.