The difference between difference tones and rapid beats
作者:
Donald E. Hall,
期刊:
The Journal of the Acoustical Society of America
(AIP Available online 1980)
卷期:
Volume 67,
issue S1
页码: 98-98
ISSN:0001-4966
年代: 1980
DOI:10.1121/1.2018511
出版商: Acoustical Society of America
数据来源: AIP
摘要:
Simultaneous production of two pure tones with frequenciesf1andf2is associated both with auditory beats (rapid fluctuations in loudness) and with audible difference tones. Since the same frequencyf1−f2is encountered in both cases, students tend to think a difference tone is nothing more than a beat phenomenon whose frequency is high enough to be in the audible range. But, in fact, these are two entirely distinct effects. I will discuss how to convincingly present this difference at three levels: (1) Simple theory of added and multiplied waveforms, (2) visual demonstration with oscilloscope plug‐in Fourier analyzer, and (3) audible demonstration. These show that our ears can literally hear and distinguish two separate phenomena.
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