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Optimal FIR filters with almost linear phase

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1 Author(s)

FIR filters are known to be stable and have a linear phase when symmetry properties, e.g., h[n]=h[M-n], are kept. A common FIR filter design method is the Parks-McClellan algorithm. In this algorithm, linear phase FIR filters, which are optimal in the minimax sense, are designed. These filters have the form of H(ω)=A(ω)ej(β-ωα), where A(ω) is real, α is an integer or an integer plus 1/2 and β is 0 or π/2. These FIR filters are always symmetric or antisymmetric. We introduce a simple procedure for designing almost linear phase FIR filters, having a similar form to H(ω), but an arbitrary α, that are optimal in a similar sense.

Published in:

Acoustics, Speech, and Signal Processing, 2003. Proceedings. (ICASSP '03). 2003 IEEE International Conference on  (Volume:6 )

Date of Conference:

6-10 April 2003