仓储粮食中害虫活动声的提取与频谱分析

以无规声源作为粮食中害虫爬行发声的理论模型，分别对20只黑菌虫（Alphitobius diaperinus Panzer）成虫在小麦中的爬行声和20只赤拟谷盗（Tribolium castaneum Herbst）成虫在玉米中的爬行声进行了数据采集．在Matlab下，对爬行声信号进行了再现．依据噪声特征，综合利用滤波器消噪和小波消噪提取出了明显的声信号．对信号的功率谱特征进行了分析，黑菌虫成虫在小麦中的爬行声频谱和赤拟谷盗成虫在玉米中的爬行声均是离散谱，前者频率最高1600Hz，主频在205Hz．后者主频在350Hz，最高频率800Hz．其结果表明，用爬行声功率谱特征可以区分粮食中害虫的种群．

The Sampling of the Insect Activity Sound in the Storage Grain and Its Frequency Spectrum Analysis

With random sound source as the acoustical model of grain insect creeping, creeping sound sampling of, 20 Alphitobius diaperinus Panzer adults in wheat and 20 Tribolium castaneum Herbst adults in corn, are made separately. The acoustical signals have been reproduced utilizing Matlab software. According to noise characteristic, and by using filter and wavelet to the signals to denoise synthetically, the obvious acoustical signals are drawn. The power spectrum characteristic of their signals have been analysed, and main frequency and the highest frequency are 205 Hz, 1 600 Hz, and 350 Hz, 800 Hz for Alphitobius diaperinus Panzer adults in wheat and Tribolium castaneum Herbst adults in corn separately.