TITLE:
Elegant and Practical Method of Fir Decimation Using Comb Filters in the Field of Digital Signal Processing
AUTHORS:
S. Arun Kumar, P. Ganesh Kumar
KEYWORDS:
Decimation, Multiband, Halfband, Comb Filter, MPS, APS, Multirate Signal Processing
JOURNAL NAME:
Circuits and Systems,
Vol.7 No.9,
July
22,
2016
ABSTRACT: This paper deals with the
technology of using comb filters for FIR Decimation in Digital Signal
Processing. The process of decreasing the sampling frequency of a sampled
signal is called decimation. In the usage of decimating filters, only a portion
of the out-of-pass band frequencies turns into the pass band, in systems
wherein different parts operate at different sample rates. A filter design,
tuned to the aliasing frequencies all of which can otherwise steal into the pass
band, not only provides multiple stop bands but also exhibits computational
efficiency and performance superiority over the single stop band design. These
filters are referred to as multiband designs in the family of FIR filters. The
other two special versions of FIR filter designs are Halfband and Comb filter
designs, both of which are particularly useful for reducing the computational
requirements in multirate designs. The proposed method of using Comb FIR
decimation procedure is not only efficient but also opens up a new vista of
simplicity and elegancy to compute Multiplications per Second (MPS) and
Additions per Second (APS) for the desired filter over and above the half band
designs.