Low-power Dolphin Sound-triggered Underwater Acoustic Recorder Based on Energy Spectrum and Cross-correlation Analysis

In order to study how dolphins transmit information through sound, a dolphin sound-triggered underwater acoustic recorder was designed to collect sound samples of dolphins communicating. When working underwater for a long time, the dolphin voice signal recorder often faces the problem of insufficient power and limited storage space. In response to this problem, this paper proposes a dolphin sound signal recorder with STM32F407 as the main processor and MSP430F5438A as the coprocessor, which can work on the seabed for a long time and store sufficient samples of dolphins' communication sounds for scientific analysis. The recorder first uses short-term energy to detect whether the dolphin is coming, and then uses a function that describes the correlation between two different signals to calculate the degree of similarity between the sound feature parameters extracted at the sound collection site and the sound feature parameters extracted at the dolphin sound sample, then the similarity value is compared with the set similarity threshold. If the similarity value is greater than or equal to the threshold, the sound signal is stored in the SD card. If the similarity value is less than the threshold, it will not be stored. The paper specifically introduces the design of acoustic triggering algorithm and the design of dolphin sound signal recorder.