Quantitative and Graphic Acoustic Analysis of Phonatory Modulations: The Modulogram.
A method is presented for analyzing phonatory instabilities that occur as modulations of fundamental frequency (fo) 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 dist...
| Publicado en: | Journal of Speech, Language & Hearing Research Vol. 46; no. 2; pp. 475 - 491 |
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| Autores principales: | , |
| Formato: | Artículo |
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American Speech-Language-Hearing Association
April 2003
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| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ssf&AN=507820512&site=ehost-live header: @attributes: shortDbName: ssf uiTerm: 507820512 longDbName: Social Sciences Full Text (H.W. Wilson) uiTag: AN controlInfo: bkinfo: jinfo: jid: 10924388 1SM jtl: Journal of Speech, Language & Hearing Research issn: 10924388 maglogo: N pubinfo: dt: April 2003 vid: 46 iid: 2 pid: 42 pub: American Speech-Language-Hearing Association artinfo: ui: 507820512 10.1044/1092-4388(2003/039) ppf: 475 ppct: 16 formats: fmt: – @attributes: type: T – @attributes: type: P size: 7.4MB tig: atl: Quantitative and Graphic Acoustic Analysis of Phonatory Modulations: The Modulogram. aug: au: Buder, Eugene H. Strand, Edythe A. su: Sound Speech Speech disorders Amyotrophic lateral sclerosis Fourier transformations sug: subj: Sound Speech Speech disorders Amyotrophic lateral sclerosis Fourier transformations ab: A method is presented for analyzing phonatory instabilities that occur as modulations of fundamental frequency (fo) 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 (fo, in Hz, and SPL, in dB), 3 frequency domains are proposed: (a) flutter (10-20 Hz), lb) tremor (2-10 Hz), and (c) wow (0.2-2.0 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. Reprinted by permission of the publisher. pubtype: Academic Journal doctype: Article src: R language: English refInfo: copyright: @attributes: flag: N holdings: @attributes: islocal: N |
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