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SCHIMMEL, J.
Original Title
Audible Aliasing Distortion in Digital Audio Synthesis
Type
journal article - other
Language
English
Original Abstract
This paper deals with aliasing distortion in digital audio signal synthesis of classic periodic waveforms with infinite Fourier series, for electronic musical instruments. When these waveforms are generated in the digital domain then the aliasing appears due to its unlimited bandwidth. There are several techniques for the synthesis of these signals that have been designed to avoid or reduce the aliasing distortion. However, these techniques have high computing demands. We have to realize that todays computer-aided music production requires tens of multi-timbre voices generated simultaneously by software synthesizers and the most of the computing power must be reserved for hard-disc recording subsystem and real-time audio processing of many audio channels with a lot of audio effects. Trivially generated classic analog synthesizer waveforms are therefore still effective for sound synthesis. We cannot avoid the aliasing distortion but spectral components produced by the aliasing can be masked with harmonic components and thus made inaudible if sufficient oversampling ratio is used. This paper deals with the assessment of audible aliasing distortion with the help of a psychoacoustic model of simultaneous masking and compares the computing demands of trivial generation using oversampling with those of other methods.
Keywords
Music, Signal processing algorithms, Signal synthesis.
Authors
RIV year
2012
Released
1. 4. 2012
ISBN
1210-2512
Periodical
Radioengineering
Year of study
21
Number
1
State
Czech Republic
Pages from
56
Pages to
62
Pages count
7
BibTex
@article{BUT91947, author="Jiří {Schimmel}", title="Audible Aliasing Distortion in Digital Audio Synthesis", journal="Radioengineering", year="2012", volume="21", number="1", pages="56--62", issn="1210-2512" }