Abstract
| Originalsprog | Engelsk |
|---|---|
| Tidsskrift | Journal of the Acoustical Society of America |
| Vol/bind | 119 |
| Udgave nummer | 1 |
| Sider (fra-til) | 620-626 |
| ISSN | 0001-4966 |
| DOI | |
| Status | Udgivet - 2006 |
Bibliografisk note
Keywordsacoustic wave propagation, acoustic wave transmission, acoustic wave reflection, acoustic field, acoustic intensity, bioacoustics, biocommunications, architectural acoustics, reverberation, hearing, forestry
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I: Journal of the Acoustical Society of America, Bind 119, Nr. 1, 2006, s. 620-626.
Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › peer review
}
TY - JOUR
T1 - Rainforests as concert halls for birds: Are reverberations improving sound transmission of long song elements?
AU - Nemeth, Erwin
AU - Dabelsteen, Torben
AU - Pedersen, Simon Boel
AU - Winkler, Hans
N1 - Keywords acoustic wave propagation, acoustic wave transmission, acoustic wave reflection, acoustic field, acoustic intensity, bioacoustics, biocommunications, architectural acoustics, reverberation, hearing, forestry
PY - 2006
Y1 - 2006
N2 - In forests reverberations have probably detrimental and beneficial effects on avian communication. They constrain signal discrimination by masking fast repetitive sounds and they improve signal detection by elongating sounds. This ambivalence of reflections for animal signals in forests is similar to the influence of reverberations on speech or music in indoor sound transmission. Since comparisons of sound fields of forests and concert halls have demonstrated that reflections can contribute in both environments a considerable part to the energy of a received sound, it is here assumed that reverberations enforce also birdsong in forests. Song elements have to be long enough to be superimposed by reflections and therefore longer signals should be louder than shorter ones. An analysis of the influence of signal length on pure tones and on song elements of two sympatric rainforest thrush species demonstrates that longer sounds are less attenuated. The results indicate that higher sound pressure level is caused by superimposing reflections. It is suggested that this beneficial effect of reverberations explains interspecific birdsong differences in element length. Transmission paths with stronger reverberations in relation to direct sound should favor the use of longer signals for better propagation.
AB - In forests reverberations have probably detrimental and beneficial effects on avian communication. They constrain signal discrimination by masking fast repetitive sounds and they improve signal detection by elongating sounds. This ambivalence of reflections for animal signals in forests is similar to the influence of reverberations on speech or music in indoor sound transmission. Since comparisons of sound fields of forests and concert halls have demonstrated that reflections can contribute in both environments a considerable part to the energy of a received sound, it is here assumed that reverberations enforce also birdsong in forests. Song elements have to be long enough to be superimposed by reflections and therefore longer signals should be louder than shorter ones. An analysis of the influence of signal length on pure tones and on song elements of two sympatric rainforest thrush species demonstrates that longer sounds are less attenuated. The results indicate that higher sound pressure level is caused by superimposing reflections. It is suggested that this beneficial effect of reverberations explains interspecific birdsong differences in element length. Transmission paths with stronger reverberations in relation to direct sound should favor the use of longer signals for better propagation.
U2 - 10.1121/1.2139072
DO - 10.1121/1.2139072
M3 - Journal article
SN - 0001-4966
VL - 119
SP - 620
EP - 626
JO - Journal of the Acoustical Society of America
JF - Journal of the Acoustical Society of America
IS - 1
ER -