A New Reverse IIR Filtering Algorithm
Straight and time-reversed filters may be combined to form linear phase filters. Examples include a Linkwitz-Riley crossover and a Hilbert filter.
Recursive Filters in Image Processing
Recursive filters in 2D, with examples of isotropic blurs, directional blurs and notch filters.
Matched Second Order Digital Filters
Biquad filters with magnitude response matching the analog counterpart for lowpass, bandpass, highpass, and peaking EQ prototypes.
A New Recursive Quadrature Oscillator
A recursive, stable, low-frequency accurate, equi-amplitude quadrature oscillator - the only one I am aware of which comprises these features.
Frequency Estimation from Two DFT Bins
Derivation of an exact (in the absence of noise) frequency estimation from two Fourier amplitudes.
© 2008 by Martin Vicanek