Title :
Characterization of aperiodicity in nearly periodic signals
Author :
Schumacher, Robert ; Chafe, Chris
Author_Institution :
Dept. of Phys., Carnegie Mellon Univ., Pittsburgh, PA, USA
Abstract :
Nearly periodic waveforms produced by musical instruments fluctuate from period to period both in the length of the period and in the shape of the waveform of each period. A measure of these fluctuations that is sensitive to correlations in waveshapes for medium time scales (up to 16 in the present implementation) is described. The method also produces two-dimensional color or gray-scale plots that allow visualization of the complexity of waveforms produced by acoustic or electronic instruments over hundreds of periods of the waveform
Keywords :
acoustic waves; fast Fourier transforms; musical acoustics; musical instruments; DFT; aperiodicity characterization; gray-scale plots; musical instruments; nearly periodic signals; two-dimensional color; Acoustic measurements; Acoustic waves; Displays; Fluctuations; Frequency; Gray-scale; Instruments; Music; Physics computing; Sampling methods; Shape; Shape measurement; Time measurement; Visualization;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 1990. ICASSP-90., 1990 International Conference on
Conference_Location :
Albuquerque, NM
DOI :
10.1109/ICASSP.1990.116169
