Glottal Efficiency of Periodic and Irregular In Vitro Red Deer Voice Production
Two female red deer larynges were artificially phonated in an excised larynx setup by varying subglottal pressure as the independent parameter. The acquired data were annotated as periodic, subharmonic and irregular by means of the recently developed phasegram technique. Glottal efficiency was non-linearly dependent on subglottal pressure. Above 1 kPa subglottal pressure the glottal efficiency increased linearly by about 3.1 and 3.7 dB per kPa, respectively, in the two larynges. At subglottal pressures above 1.5 kPa the glottal efficiency of the irregular segments was in average about 2.5 to 3 dB greater than that of the periodic and subharmonic segments. The results of this pilot study suggest that an irregular sound production mechanism at higher subglottal pressures could be a means to gain an energetic advantage in animal vocal communication when converting metabolic to acoustic energy.
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Document Type: Research Article
Publication date: July 1, 2014
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- Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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