飞机驾驶舱话音记录器中开关声的三尺度小波分析

Three scale wavelet analysis of switch sound recorded by airplane cockpit voice recorder

摘要: 国内目前主要采用基于计算机音频原理的译码系统对飞机驾驶舱话音记录器记录的舱音信号进行“辨听”分析,这种舱音分析方法存在不易获得准确的舱音信号特征的缺点。根据这一问题,针对某一真实舱音中的瞬态开关声信号,提出了利用一维离散小波函数进行三尺度分解小波方法,得到了基于传统“辨听”方法得不到的、更多、更准确的舱音声频特征,为识别分析瞬态、非平稳飞机舱音信号提供了一种较好的参考依据。

Abstract: Cockpit voice recorder(CVR) decoding systems are used for analysis of cockpit voice signals based on the "differentiating and hearing" method,which is difficult to provide accurate results.We use wavelet transform to analyze the real switch sound in the cockpit voice signal.A one-dimensional discrete wavelet function with three scales is used.Detailed spectral characteristics of the switch sound are obtained.This provides a better method for transient and non-steady state cockpit voice signal analyses.