Document Detail

Frequency and voice: perspectives in the time domain.
MedLine Citation:
PMID:  16626935     Owner:  NLM     Status:  MEDLINE    
Frequency variation is one of the most primitive features of voice production, endowing language and communication with richness and efficiency and enhancing enjoyment of the voice arts. In the first of two tutorial articles, the subject of frequency is examined formally, beginning in the time domain. A companion article explores the topic of frequency and voice from the frequency domain perspective. Frequency is a well-defined quantity of the sinusoidal function and of periodic functions of time. However, voice is inherently nonstationary, even over short time segments, to degrees that range from minor (stable vowels of a healthy voice) to major (singing voice and voiced consonants). For signals that are not periodic, the notion of frequency is ambiguous and often altogether unclear, which has led to a multitude of frequency-measurement techniques and discrepancy of measures. This article identifies the source of these discrepancies for a variety of time-domain techniques that are examined in the absence of noise. In the time domain, the subject of frequency is inherently coupled to the topic of signal modeling, which is explored in some detail. Sinusoidal models having time-varying phase are examined with the objective of achieving a frequency description of voice that is both continuous and instantaneous. The analytic signal method of mathematical physics is discussed and applied to the technology of empirical mode decomposition to demonstrate that the frequencies of voice may be comprehensively examined from the time domain point of view.
Rick M Roark
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Publication Detail:
Type:  Journal Article; Review     Date:  2006-04-19
Journal Detail:
Title:  Journal of voice : official journal of the Voice Foundation     Volume:  20     ISSN:  0892-1997     ISO Abbreviation:  J Voice     Publication Date:  2006 Sep 
Date Detail:
Created Date:  2006-08-21     Completed Date:  2008-04-15     Revised Date:  2013-05-20    
Medline Journal Info:
Nlm Unique ID:  8712262     Medline TA:  J Voice     Country:  United States    
Other Details:
Languages:  eng     Pagination:  325-54     Citation Subset:  IM    
Department of Otolaryngology, New York Medical College, Valhalla, NY 10595, USA.
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MeSH Terms
Sound Spectrography
Speech Acoustics*
Speech Production Measurement
Time Factors
Voice / physiology*
Voice Quality

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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