Title :
Audio signal processing via harmonic separation using variable Laguerre filters
Author :
Tay, David B. H.
Author_Institution :
Dept. of Electron. Eng., La Trobe Univ., Bundoora, Vic., Australia
Abstract :
In audio processing, such as data compression and time/pitch scale modification, it is necessary to model the audio signal using an appropriate ´analysis´ model. The ´sines+transient+noise´ model, where the signal is separated into components of harmonic, transient and residual noise, is such a model that can be used in the analysis. In this model the harmonic separation is achieved by sending the signal through a uniform set of filters, usually having a fixed frequency resolution (bandwidth). In this paper we propose a pitch-synchronous IIR Laguerre filter having a time varying bandwidth (constant Q-factor) for the filter set. The advantages of using such a filter set in audio processing are discussed in the paper.
Keywords :
IIR filters; Q-factor; audio signal processing; data compression; filtering theory; harmonics; audio processing; audio signal processing; constant Q-factor; data compression; frequency resolution; harmonic noise; harmonic separation; pitch-synchronous IIR Laguerre filter; residual noise; sines+transient+noise model; time varying bandwidth; time/pitch scale modification; transient noise; variable Laguerre filters; Bandwidth; Data compression; Frequency; Harmonic analysis; IIR filters; Power harmonic filters; Signal analysis; Signal processing; Signal resolution; Transient analysis;
Conference_Titel :
Circuits and Systems, 2003. ISCAS '03. Proceedings of the 2003 International Symposium on
Print_ISBN :
0-7803-7761-3
DOI :
10.1109/ISCAS.2003.1205080