The Analysis of the Speech of Communication Vocabulary of Military Pilot and Factors Affecting the Intelligibility

摘要

The vocabularies of communication used by military pilot and related to failure are established in this paper. The Chinese speeches of the words of the vocabularies are analyzed in time, frequency and spectrogram domain. The result shows that: (1) the main energy of these words concentrates mostly on the lower band, below 4000 Hz, it is the characteristic of the Chinese speech of the most words in above vocabularies. (2) the formants of each phoneme are less than five, and the first three formants are between 200 - 3200 Hz. The factors correlated to the speech intelligibility of military pilot, throat pickup, acoustic noise in cockpit, communication channel, recording device in control tower, are analyzed detailedly. The conclusions are obtained that the main factors affecting the intelligibility are throat pickup and the acoustic noise in cockpit. It is pointed out that the noise in cockpit occupies the same frequency band as the speech of pilots and the conventional filters with fixed parameters are not available to filter the noise from the speech. The method of improving pickup is proposed.