中文摘要：

针对传统舱音译码系统在辨听、分析舱音背景声上的不足,并利用线性调频Z变换（CZT）适用于高采样频率的信号、而且计算中可以任意调整频率的分辨率等频谱分析的灵活性,提出基于CZT获取飞机舱音背景声的特征频率的新方法。通过仿真和以飞机驾驶舱高速配平移动背景声为例进行计算分析。和实验测试结果对比得出：CZT方法是一种适合于确定舱音背景声特征频率的有效方法,对调查飞机事故原因具有较好的实用性。

英文摘要：

Because of the deficiency of traditional cock voice decoding system （CVDS） in differentiating and analyzing cockpit background sound, the Chirp Z Transform （ CZT） algorithm was applied to obtain the exact characteristics frequency of the cockpit background sound in airplanes. The CZT algorithm can collect high sampling frequency and has the flexibility for adjusting frequency resolution in spectrum analysis. As an example, the simulation and calculation of the background sound due to high speed counterpoise movement from cockpit were given. It was proved in comparison with the experiment results that the CZT algorithm is a preferable method to confirm the exact characteristics frequency. It was concluded that this method is practical in investigating accident cause for airplane wrecking.