Firmware development system for dolphin's clicks waveform reproduction
1990
Ishii, K. (National Research Inst. of Fisheries Engineering, Hasaki, Ibaraki (Japan))
The author has researched the dolphin's behavior control technique to prevent them from being caught in drift nets. An acoustic study on Dall's porpoises in the Sea of Okhotsk off Hokkaido in 1985 is reported as follows: When porpoises were floating with ease around the vessel, and the sound waves were given off, they started to jump up and escaped in a direction away from transmitter. The signal source was synthesized using supersonic sinusoidal waves. As a result of this sound projection experiment, the author is of the opinion that clicks transmitted by dolphins themselves are more significant as a signal source of the threading device in respect to ecology. Then, the author designed a biosonar simulator and developed software, calling at the firmware development system for clicks waveform reproduction. This software has a consistent routine from drawing of a parameter and data by modeling program into IC memory chip. Wave parameters are evaluated from graphs made by the clicks acquisition system. The modeling divides the clicks between burst and waiting periods. The IC memory written clicks wave data is loaded into the biosonar simulator as the signal source of the projection supersonic
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