Title :
Frequency-shift: a way to reduce aliasing in the complex cepstrum
Author_Institution :
Dept. of Inf. Technol., Tech. Univ. Denmark, Lyngby, Denmark
Abstract :
The well-known relation between a time signal and its frequency-shifted spectrum is introduced as an excellent tool for reduction of aliasing in the complex cepstrum. Using N points DFTs the frequency-shift property, when used in the right way, will reduce the aliasing error to a size which on average is identical to the one normally requiring 2N points DFTs. The cost is an insignificant increase in the number of operations compared to the total number needed for the transformation to the complex cepstrum domain
Keywords :
FIR filters; autoregressive moving average processes; cepstral analysis; discrete Fourier transforms; equiripple filters; low-pass filters; signal processing; ARMA model; N points DFTs; aliasing error; aliasing reduction; complex cepstrum; equiripple lowpass linear-phase FIR filter; frequency-shifted spectrum; signal processing; time signal; Cepstrum; Costs; Deconvolution; Discrete Fourier transforms; Fourier transforms; Frequency; Information technology; Seismology; Signal processing; Speech processing;
Conference_Titel :
Electronics, Circuits and Systems, 1998 IEEE International Conference on
Conference_Location :
Lisboa
Print_ISBN :
0-7803-5008-1
DOI :
10.1109/ICECS.1998.814091
