A family of low-pass filters having pseudo-monotonic magnitude response approximating linear phase
V. Ramachandran, Christian S. Gargour, Ravi P. Ramachandran · 2007
A new approximation to obtain close to linear phase is presented in this paper. This is based on the rational fraction expansion of the hyberbolic cotangent function. The resulting transfer function is always of odd order. It is shown that a good approximation of the phase is obtained in the pass-band. The magnitude response at most places is monotonic in character, but does show a degree of flatness on a portion of the frequency spectrum. Key words: linear phase, pseudo monotonic response 1.