Fraunhofer-gesellschaft Zur Foerderung Der Angewandten Forschung E.v.

Rolf Kapust

Harald Popp

Ernst Eberlein

Karlheinz Brandenburg

Dieter Seitzer

Heinz Gerhauser

Hartmut Schott

Dieter Seltzer

A frequency analysis method comprises using a window function to evaluate a emporal input signal present in the form of discrete sampled values. The windowed input signal is subsequently subjected to Fourier transformation for the purpose of generating a set of coefficients. In order to develop such a method so that the characteristics of the human ear are simulated not only with respect to the spectral projection in the frequency range, but also with respect to the resolution in the temporal range, a set of different window functions is used to evaluate a block of the input signal in order to generate a set of blocks, weighted with the respective window functions, of sampled values whose Fourier transforms have different bandwidths, before each of the simultaneously generated blocks of sampled values is subjected to a dedicated Fourier transformation in such a way that for each window function at least respectively one coefficient is calculated which is assigned the bandwidth of the Fourier transforms of this window function, and that the coefficients are chosen such that the frequency bands assigned to them essentially adjoin one another.

Frequency analysis method

Apparatus for checking audio signal processing systems

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Erlangen, Germany

Rolf Kapust