Dear collegues,
the paper:
Vyacheslav Ryabov. 2011. Some Aspects of Analisis of Dolphins' Acoustical
Signals. Open Jornal of Acoustics. 1: 41-54. doi:10.4236/oja.2011.12006, it
is openly accessible at http://www.scirp.org/journal/oja
Abstract
Dolphins produce various types of sounds in a wide range of frequencies.
Characteristics of some sounds till now have not been correctly registered,
that influenced on interpretation of their functions. Studying of the
characteristics and functions of dolphins’ acoustical signals is the purpose of
the present work. In this work the acoustical signals of two dolphins (Tursiops
truncatus) were registered by two-channel system in the frequencies band up to
200 kHz at quasi-stationary position of the dolphins. The dolphins along with
whistles are producing the packs of coherent and non-coherent broadband pulses.
The waveform and spectrum of coherent pulses was invariable within a pack, but
considerably varies from a pack to a pack. The waveform of each non-coherent
pulse vary from a pulse to a pulse in each pack, therefore their spectrum also
vary from a pulse to a pulse and have many extremums in the band of 6 - 200
kHz. It is very likely that the non-coherent
pulses play a part of phonemes of a dolphin spoken language and the probing
signals of dolphin’s noncoherent sonar. The use possibility of the signals by
dolphins for communication and orientation was considered, as the signals
apparently are bimodal. Results of the work have significance for further
studying of the dolphin’s sonar and spoken language.
Keywords: Dolphins, Hearing, Sonar, Acoustical Signals, Language, Orientation
Best regards,
Dr. Vyacheslav A. Ryabov
Karadag Natural Reserve
National Academy of Science of Ukraine
Kurortnoe, Feodosia, 98188, Crimea, Ukraine
mailto:ryab...@ukr.net
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