Signal Processing
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Lutz Lehmann

Lutz Lehmann, Dr. math., living in Berlin, Germany

I once was interested in discrete orthogonal wavelet transforms, constructing examples of symmetric 4-channel transforms and more exotic variants in 3, 5, 7, 8 channels using algebraic geometry with an elimination type algorithm (Kronecker in CAS Magma, research group OpTERA).

Nowadays my interest is in numerical algorithms, specifically for differential equations, the history of mathematics and science.

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Top posts (37) All Questions Answers | Votes Newest

8 Zero-pad before or after windowing for FFT Jan 12 '14
5 Fourier Transform of Morlet wavelet Function? Feb 11 '14
4 Difference between DFT and Z-Transform Feb 17 '14
4 Understanding $\mathcal Z$-transforms and pole locations Jan 2 '14
4 Generating a sound where end frequency is 1/2 of the start frequency Jan 2 '14
3 ifft of signal without phase information Jan 14 '14
3 What is a window function in DSP and why do we need it? Jan 29 '14
3 Nyquist Frequency Phase Shift Jan 31 '14
2 Digital filters and the Z-transform Jan 7 '14
2 Manipulating with frequencies through fftw Feb 17 '14
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