DocumentCode :
1561180
Title :
Efficient computation of aliasing noise in down-sampling filters
Author :
Quirk, Maureen P.
Author_Institution :
Inst. for Defense Analyses, Princeton, NJ, USA
fYear :
1989
Firstpage :
817
Abstract :
The author describes an efficient algorithm for evaluating the frequency response of the aliased noise in FIR (finite impulse response) down-sampling filters. The algorithm uses Parseval´s theorem and an index-mapped DFT (discrete Fourier transform) decomposition to obtain the resolution of an MK-point transform using only K transforms of length M, where K is the down-sampling factor and 1/M is the desired frequency resolution in the down-sampled domain. For real symmetric FIR filters the symmetries in the spectrum can be exploited to reduce the computation by another factor of four. The algorithm was used to evaluate the frequency response and expected aliasing noise for a low-pass filter designed to be decimated by 128
Keywords :
digital filters; filtering and prediction theory; FIR; MK-point transform; aliasing noise; digital filters; discrete Fourier transform; down-sampling filters; finite impulse response; frequency resolution; low-pass filter; Discrete Fourier transforms; Fast Fourier transforms; Filter bank; Finite impulse response filter; Frequency conversion; Frequency response; Multiplexing; Passband; Transfer functions;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Acoustics, Speech, and Signal Processing, 1989. ICASSP-89., 1989 International Conference on
Conference_Location :
Glasgow
ISSN :
1520-6149
Type :
conf
DOI :
10.1109/ICASSP.1989.266553
Filename :
266553
Link To Document :
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