Design of the biosonar simulator for dolphin's clicks waveform reproduction.
1992
Ishii K. | Akamatsu T. | Hatakeyama Y.
Clicks of Dall's porpoises are pulse train of burst signals with an ultrasonic carrier frequency. The authors have designed the biosonar simulator for dolphin's clicks waveform reproduction under water. The total reproduction system consists of a clicks signal acquisition block, a waveform analysis block, a memory unit, a simulator of clicks signal and a transmitter of an ultrasonic wave under water. In the sea, data memorized in an EPROM are read out sequentially by a fast clock and converted to analog output signals. Then an ultrasonic power amplifier reproduces these signals through a transmitter against dolphins under water. Clicks signal replaying block is called Biosonar Simulator (BSS), which simulates the clicks of dolphin. The details of BSS are described in this paper. A unit waveform is defined, which is divided into a burst period and a waiting period. Clicks is a train of a unit waveform, where digital data are sequentially read out from EPROM of waveform data dependent on parameters. The basic functions of BSS are as follows. (1) Reading clock: 100 ns - 25.4 mus. (2) Number of reading clock: 34 - 1024 times. (3) Counter clock in a waiting period: 100 ns - 25.4 mus. (4) Number of count clock: 0 - 16777215 times. (5) Number of burst/waiting repetition cycle: 1 - 128 times. (6) Transmission level adjustment by a programmable attenuator: 0 - 86.5dB. These basic functions enable a biosonar simulator to replay clicks of Dall's porpoise precisely.
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