蝙蝠回声定位叫声的时频分析

Analysis of Echolocation Calls of Bats by Using Time-Frequency Representation

大多蝙蝠回声定位叫声属于非平稳信号,目前大多专用商业软件采用短时傅立叶变换(STFT:ShortTime Fourier Transform)对其进行分析。STFT存在时频分辨率不高的缺点,因此研究其它时频分析方法在蝙蝠回声定位叫声分析中的应用很有意义。以一大棕蝠(Eptesicus fuscus)回声定位叫声为例比较了几种时频分析方法的应用效果,为编写蝙蝠回声定位叫声信号分析软件选择一种合适的时频分析方法提供依据。

Many commercial soft-wares analyze echolocation calls of the bat by using short time Fourier transform （STFI）, which suffers from limited time-frequency resolutions. Therefore, it＇s of great significance to study the applications of other time- frequency analysis techniques. The efficacy of some time-frequency techniques is compared and examined through the call of a Large Brown Bat （Eptesicus Fuscus）. The conclusions of this work provide some suggestions for selecting a suitable time-frequency technique to write software designed for bat call signal processing.