At he same time, muffler styles and evaluation of acoustic performance and analysis methods of acoustic characteristic are introduced detail by detail.
同时，对消声器的分类，消声性能评价以及消声特性分析方法进行了详细的说明。
Based on analysis of spectral characteristic of helicopter acoustic signal, a method of extracting harmonic frequencies from the helicopter acoustic signal via ESPRIT is proposed.
在对直升机声信号特征进行分析之后，提出了一种基于谐波恢复的ESPRIT方法来提取直升机声信号谐波频率作为特征用以识别直升机声目标。
A recognition method based on gray correlation analysis algorithm is proposed through extracting LPC, characteristic from tank, helicopter and car acoustic.
提出了一种基于灰关联分析的声目标识别算法。
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