Yuka Mishima Oceanological of the University of Tokyo has developed a prototype device that is able to publish the entire range of sounds that are used in your lexicon real dolphins from the clacking and whistles to be used for echolocation ultrasound.
Dolphins live in the aquatic environment where vision is not very effective, so they have developed a communication very difficult communication and hearing aid. The spectrum of the sound waves on which it is based, is much broader than the range of the sound waves that are available to man. For a long time, "communication" with the dolphins came down to record their voices and study the reactions of dolphins to other sounds.
Scientists could not move from the use of records to the direct generation of sounds made by dolphins, as these mammals use to communicate with a very wide range of frequencies up to 200 kHz, compared to man the maximum frequency is 20 kHz sound. Another difficulty lies in the fact that the person on sound speaks or sings in the same key, and dolphins can simultaneously emit sounds of different frequencies.
Also, apparently, the devices used by scientists to play voice recordings of dolphins, were imperfect, because usually Dolphins, who lost their relatives recording the voices, very quickly lost interest in the signal.
To overcome these sound of Yuka Mishima developed the first broadband "communicator", which is based on four piezoelectric crystals that reproduce sounds at up to 150 kHz, and silver acoustic components, which are designed for low frequencies. All the elements of this "dolphin device" attached to the acrylic disk. For all frequency voltage is fixed and the intensity of the dolphin votes are equally high. The sensitivity of the switch in the range 6-170 kHz is 16 dB.
Scientists have investigated the effectiveness of a new device in the experiments with the ocean and dolphins have proven that it is actually very accurately reproduces the "speech" of dolphins in the whole range. In the near future Yuka Mishima is going to spend some more tests to see whether it is possible with this device to communicate with dolphins, using fixed "words" and "phrases" that use these mammals for intraspecific communication.
According to the materials Sciencemagic.ru