Quantitative and Graphic Acoustic Analysis of Phonatory Modulations: The Modulogram.
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| Title: | Quantitative and Graphic Acoustic Analysis of Phonatory Modulations: The Modulogram. |
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| Authors: | Buder, Eugene H., Strand, Edythe A. |
| Source: | Journal of Speech, Language & Hearing Research. Apr2003, Vol. 46 Issue 2, p475. 16p. 6 Graphs. |
| Subject Terms: | *Voice disorders, *Articulation disorders, Amyotrophic lateral sclerosis |
| Abstract: | A method is presented for analyzing phonatory instabilities that occur as modulations of fundamental frequency (f[sub0] ) and sound pressure level (SPL) on the order of 0.2 to 20 cycles per second. Such long-term phonatory instabilities, including but not limited to traditional notions of tremor, are distinct from cycle-to-cycle perturbation such as jitter or shimmer. For each of the 2 parameters (f[sub0] , in Hz, and SPL, in dB), 3 frequency domains are proposed: (a) flutter (10u20 Hz), (b) tremor (2u10 Hz), and (c) wow (0.2u2.0 Hz), yielding 6 types of instability. Analyses were implemented using fast Fourier transforms (FFTs) with domain-specific analysis parameters. Outputs include a graphic display in the form of a set of low-frequency spectrograms (the "modulogram") and quantitative measures of the frequencies, magnitudes, durations, and sinusoidal form of the instabilities. An index of a given instability is developed by combining its duration and average modulation magnitude into a single quantity. Performance of the algorithms was assessed by analyzing test signals with known degrees of modulation, and a range of applications was reviewed to provide a rationale for use of modulograms in phonatory assessment. [ABSTRACT FROM AUTHOR] |
| Copyright of Journal of Speech, Language & Hearing Research is the property of American Speech-Language-Hearing Association and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Education Research Complete |
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| Abstract: | A method is presented for analyzing phonatory instabilities that occur as modulations of fundamental frequency (f[sub0] ) and sound pressure level (SPL) on the order of 0.2 to 20 cycles per second. Such long-term phonatory instabilities, including but not limited to traditional notions of tremor, are distinct from cycle-to-cycle perturbation such as jitter or shimmer. For each of the 2 parameters (f[sub0] , in Hz, and SPL, in dB), 3 frequency domains are proposed: (a) flutter (10u20 Hz), (b) tremor (2u10 Hz), and (c) wow (0.2u2.0 Hz), yielding 6 types of instability. Analyses were implemented using fast Fourier transforms (FFTs) with domain-specific analysis parameters. Outputs include a graphic display in the form of a set of low-frequency spectrograms (the "modulogram") and quantitative measures of the frequencies, magnitudes, durations, and sinusoidal form of the instabilities. An index of a given instability is developed by combining its duration and average modulation magnitude into a single quantity. Performance of the algorithms was assessed by analyzing test signals with known degrees of modulation, and a range of applications was reviewed to provide a rationale for use of modulograms in phonatory assessment. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 10924388 |
| DOI: | 10.1044/1092-4388(2003/039) |
