Daimler Chrysler Ag

Daimler Ag

Konrad Boehm

Johann-Friedrich Luy

Thomas Mueller

A method and a device for determining the condition of roadway surfaces includes transmitting electromagnetic radiation at at least two different frequencies in the GHz range, reflecting and/or scattering the electromagnetic radiation by the roadway surface and subsequently receiving the electromagnetic radiation at the at least two frequencies. The condition of the roadway surface is determined on the basis of a comparison of the radiation intensities received at the different frequencies.

Method and device for determining the roadway condition

A method for analog-to-digital conversion of an analog signal includes decomposing the signal in the time domain into intervals, and transforming these intervals one after another using orthogonal functions, the coefficients corresponding to the orthogonal functions being defined and digitized. The transformed signal is then inversely transformed in the digital domain using the digitized coefficients and the same or different orthogonal functions. A high level of performance with respect to bandwidth and resolution may be achieved.

Method and device for analog-to-digital conversion of a signal

A method for digital-to-analog conversion of a digital signal (x (t )) comprises resolving the signal (x (t )) in the time region into intervals and successively transforming these intervals on the basis of orthogonal functions (g (t)). Coefficients (a ) associated with the orthogonal functions (g (t)) are determined and converted from digital to analog and the signal (x (t)) is transformed back in the analog region on the basis of analog coefficients (a ), which result therefrom, by means of orthogonal functions (h (t)).

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Blaustein, Germany

Konrad Boehm