DocumentCode :
1386049
Title :
Reducing Aliasing from Synthetic Audio Signals Using Polynomial Transition Regions
Author :
Kleimola, Jari ; Välimäki, Vesa
Author_Institution :
Dept. of Signal Process. & Acoust., Aalto Univ., Espoo, Finland
Volume :
19
Issue :
2
fYear :
2012
Firstpage :
67
Lastpage :
70
Abstract :
Sampling of discontinuous audio signals with rich spectra is a valuable asset in subtractive synthesis, but results in aliasing distortion. This letter proposes an aliasing-reduction technique, which is cost-effective, transient-free, and extensible to various discontinuities. It replaces the samples on a finite region around each discontinuity with values taken from a smooth polynomial, based on a novel interpretation of the differentiated polynomial waveform (DPW) method. In the musical pitch range, the number of operations in the proposed method is at least 40% smaller than in the DPW algorithm. The method is widely usable in sound synthesis applications.
Keywords :
audio signal processing; music; polynomial approximation; signal synthesis; smoothing methods; aliasing distortion; aliasing reduction technique; discontinuous audio signal Sampling; musical pitch range; polynomial transition region; smooth polynomial; sound synthesis application; subtractive synthesis; synthetic audio signal; transient free aliasing reduction; Acoustic distortion; Educational institutions; Materials; Polynomials; Radiation detectors; Table lookup; Time domain analysis; Acoustic signal processing; antialiasing; audio oscillators; music; signal synthesis;
fLanguage :
English
Journal_Title :
Signal Processing Letters, IEEE
Publisher :
ieee
ISSN :
1070-9908
Type :
jour
DOI :
10.1109/LSP.2011.2177819
Filename :
6093730
Link To Document :
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