United Time-Frequency Analysis For Background Sounds of CVR

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Journal of Vibration and Shock ›› 2009, Vol. 28 ›› Issue (1) : 143-145.

论文

United Time-Frequency Analysis For Background Sounds of CVR

Li Xiangbin Li Guo Li Xueren

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Abstract

Cockpit voice recorder (CVR) in aircraft records many cockpit voices, such as speaker voices, noises, background sounds with special meanings. Cockpit voices’ complexity exacerbates analysis difficulty through traditional differentiating & hearing methods, so that more cockpit voices’ characteristics are not resolved easily. According to the shortage in cockpit voice hearing and analyses by traditional short time Fourier transformation (STFT), the united time-frequency analysis, which is introduced into airplane cockpit voice
analyses, expands CVR analysis method. Compared with these methods, time-frequency distributions and reassigned versions each has its strong point at time-frequency resolution and immunity of cross term interference, and are adapted to analyze non-stationary cockpit background sounds, and offer a method as a reference for flight accident investigatations.