By H. C. Gerhardt (auth.), Dr. Steven L. Hopp, Dr. Michael J. Owren, Dr. Christopher S. Evans (eds.)
The final a long time have introduced an important raise in learn on acoustic communi cation in animals. book of clinical papers on either empirical and theoretical points of this subject has tremendously elevated, and a brand new magazine, Bioacoustics, is fullyyt dedicated to such articles. Coupled with this proliferation of labor is a attractiveness that the various present concerns are most sensible approached with an interdisciplinary point of view, requiring technical and theoretical contributions from a couple of parts of inquiry that experience regularly been separated. With the extraordinary exception of a set edited by means of Lewis (1983), there were fewvolumes predominatelyfocused on technical concerns in comparative bioacoustics to stick to up the earlyworks edited through Lanyon and Tavolga (1960) and Busnel (1963). It was once the large progress of workmanship c:()ncerning this subject specifically that supplied the preliminary impetus to prepare this quantity, which makes an attempt to offer primary info from either theoretical and utilized points of present bioacoustics learn. whereas a totally finished overview will be impractical, this quantity bargains a uncomplicated remedy of a large choice of issues geared toward delivering a conceptual framework during which researchers can deal with their very own questions. every one presentation is designed to be necessary to the broadest attainable spectrum of researchers, together with either these presently operating in any of the various and various disciplines of bioacoustics, and others that could be new to such studies.
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Additional info for Animal Acoustic Communication: Sound Analysis and Research Methods
A pure tone), the output is a sinusoid of exactly the same frequency. , a delay). These two properties depend on the frequency of the input and are collectively described by the filter's magnitude response and its phase response. Figure 2 shows the frequency response of the recursive smoothing filter described in Eq. (4). As illustrated, the amplitudes ofhigh-frequency components (fast variations) are attenuated. Phase-shifts imposed by the filter are also frequency-dependent, but in a quite different II1apIler than in the case of amplitude.
WestviewPress, Boulder, pi Harris CM (1991) Definitions, abbreviations, and symbols. In: Harris CM (ed) Handbook of acoustical measurements and noise contro!. 1 Hassall JR (1991) Noise measurement techniques. In: Harris CM (ed) Handbook of acoustical measurements and noise contro!. 1 Heller KG (1990) Evolution of song pattern in east Mediterranean Phaneropterinae: constraints by the communication system. In: Bailey WJ, Rentz DCF (eds) The Tettigonüdae: Biology, systematics and evolution. Crawford House Press, Bathurst, p 130 Langbauer WR, Payne KB, Charif RA, Rapaport L, Osborn F (1991) African elephants respond to distant playbacks oflow-frequency conspecific calls.
However, the perceptual significance of such a fine-grained analysis is dubious because both auditory systems and spectrum analyzers perform frequency analyses by averaging over some finite time interval. Very short sounds often do not have a very well-defined pitch. For a single pulse ofthe pine woods tree frog, for example, the bandwidth (-10 dB) is about 600 Hz (Figure 9F). This value is obtained by determining the frequencies above and below the peak frequency (2190 Hz, 0 dB) that have a relative amplitude of -lO dB, and subtracting the lower frequency from the higher one.
Animal Acoustic Communication: Sound Analysis and Research Methods by H. C. Gerhardt (auth.), Dr. Steven L. Hopp, Dr. Michael J. Owren, Dr. Christopher S. Evans (eds.)