Bats Made Sound Field Intensity Distribution Of The Measurement Of The Simulation System,

Bat is the general designation of chiroptera animals. It is a kind of breast-feed mammal which most extensively distributed and most successfullly evolving. Bats distribute in all kinds of land ecology enviroments in the world expect the South Pole, the North Pole and some remote islands which are in oceans. During the evolution bait flys to avoid competitions with other animals which live in ocean or on land. Successful evolution of echolocation system in the sky makes them avoidcompetitions with birds. So thy occupied a special ecological niche-skyof night. Bat is expert in activing during the night. It has a poor sense of sight while an unusual developed sense of hearing. Because of using echolocation effectively they can fly freely and catch edibles accurately during the night or in very dark enviroments. So it is very meaningful to study their echolocation calls in ecology concentrates in researching time-frequency charaters of the signals. But in acoustics the three dimension field intensity distribution in space is an unignorant character of the signal of bat and is very valuble to be researched. There are not any special documents about surveying and studying the three dimensions field intensity distribution in space of bat. Furthermore, the calls of bats are supersonic pulse, so it is very necessary to use special digital signal processing equipments.Because there are no special instruments we plan to design a special instrument to study the soud field intensity distribution of bat. We use fix point DSPs TMS320VC5402 as a core chip which is made by TI. This paper summarizes the work what we have attempted to do. This thesis is consisted of 6 contents. First, we introduces the meaning of studying echolocation, what means have been used by now, accomplishments got by others and pose the meaning of surveying sound field intensity. Secondly, we expounds theory forecast of the sound field intensity distribution of batin acoustics and analysis the character of the signal that we collect at present. Thirdly, we discuss the problems we have met one by one. And then discusses hardware and software of this system in the two later parts. At last we analysis the results of this reseach. We attempt to survey the calls of bat initially by our work and make a foundation for the follow-up work.