Analysis of Sound Signal and Intensity of Frogs to Recognize Their Habitat in Artificial Wetlands
Date Issued
2007
Date
2007
Author(s)
Hsu, Cheng-Yu
DOI
zh-TW
Abstract
In recent years, along with the population growth and the economical development, the natural ecological environment received enormous suffering, threatening the survival of frogs. In metropolis' hustle, people can hardly hear the simple frogs’ song anymore. While acclaiming its pure wonderfulness, we wish to understand them better. However, as we look around without any trace of frogs, and the frog's sound difference too much for the human ears to tell one kind from another, we hopes to develops a set of simple, quick computer formulas that can automatically recognize which types of frog by the sound it made.
This study was combined with energy method, MFCC feature method, and neural networks to recognize the species of frogs. If the volume was over the set threshold, it was defined as one syllable. We extracted the first twelve MFCC features from every syllable, then analyzed its mean, variation, and the position which the max and min values appeared. Eventually, forty-eight dimensions was input to train and test. The result shows the accuracy was up to 70%.
Declines in amphibian populations have been noted all over the world and perceived as one of the most critical threats to global biodiversity. Wetland managers need more information concerning amphibian habitat requirements. There is a new artificial wetland between the Bai-Shi River and local community. It is the best buffer zone for amphibian production activity there。
Most ecosystems of amphibian animals took place on the lake banks, yet there was less related design solutions offered in Taiwan. This research selected 40 sample sites in Du-Nan Wetland. We test the feasibility for measuring frog abundance by sound-level meter first, and then study the relationship between some important habitat variables and frogs by factor analysis.
The result shows that sound-level meter can be used for measuring the abundance of Microhyla ornata Dumeril. Also, the amounts of frog and the bank slope are negatively relative. Bank slope is designed to be less than 40 recommending degrees. The pond size, plant diversity and plant density are positively relative to the species richness. The pond size is recommended to be larger than 500 square meters. The density of Hydrophila pogonocalyx Hayata is recommended to be 0.4-0.6 per stem/cm. Thos can be reference for designing frog corridor.
Subjects
蛙聲辨識
類
神
經網路
梅爾倒頻譜
兩
棲類
噪音計
棲地因子
生物廊
道
sound recognition
neural networks
mfcc
amphibian
sound-level meter
habitat requirements
corridor
Type
thesis
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