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Time‐Varying Spectra of Violin Tones

 

作者: James W. Beauchamp,  

 

期刊: The Journal of the Acoustical Society of America  (AIP Available online 1969)
卷期: Volume 46, issue 1A  

页码: 123-123

 

ISSN:0001-4966

 

年代: 1969

 

DOI:10.1121/1.1973428

 

出版商: Acoustical Society of America

 

数据来源: AIP

 

摘要:

Harmonic analyses of several violin tones have been performed by computer. Each sound is represented by a finite series of harmonic‐amplitude and phase‐spectrum components varying with time. Graphical representations of spectra being explored are: (1) individual plots of fundamental‐frequency harmonic amplitudes (both linear and dB), and relative phases as functions of time; (2) line‐spectra movies with harmonic amplitude changes slowed 20:1; (3) spectrograms with vertical frequency scale, horizontal time scale, and darkness indicating amplitude. Spectrum analysis can be performed synchronously with the fundamental or asynchronously at a base frequency much lower than the fundamental, with advantages for each method. Completeness of harmonic analysis is demonstrated by examples of tones resynthesized using smoothed versions of harmonic‐amplitude and pitch curves. For storage purposes, synthetic tones typically require 500 to 800 parameter‐time coordinates per 1 sec of sound. Over all, the violin tones analyzed are characterized by strong resonances in regions 500–700 Hz and 1800–2500 Hz, a strong antiresonance at 1100–1500 Hz, and many peaks and valleys above 2000 Hz. Features of attack, steady‐state, and decay will be discussed in terms of spectrum graphs.

 

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