Acoustic-phonetic analysis of loud and Lombard speech in simulated cockpit conditions

Acoustic-phonetic differences between normal and abnormal speech in reference to recognition systems for the aircraft cockpit are studied. The speech used in this research was collected in an anechoic chamber with an oxygen mask, and the speaker spoke (1) normally, (2) loudly ( approximately 10 dB above normal), and (3) with 90 dB of pink noise injected into the ears (invoking the Lombard reflex). Eighteen features were analyzed for approximately 11000 phonemes (from five speakers) to determine significant differences in the three types of speech. The most reliable trends observed were energy migrations in the frequency domain and the associated changes in spectral tilt for the sonorants.<<ETX>>

[1]  H. Lane,et al.  Regulation of voice communication by sensory dynamics. , 1970, The Journal of the Acoustical Society of America.

[2]  H. Lane,et al.  The Lombard Sign and the Role of Hearing in Speech , 1971 .

[3]  John E. Markel,et al.  Linear Prediction of Speech , 1976, Communication and Cybernetics.

[4]  R. G. Klumpp,et al.  Effects of Ambient Noise and Nearby Talkers on a Face‐to‐Face Communication Task , 1962 .

[5]  George R. Doddington,et al.  Recognition of speech under stress and in noise , 1986, ICASSP '86. IEEE International Conference on Acoustics, Speech, and Signal Processing.

[6]  David B. Pisoni,et al.  Some acoustic-phonetic correlates of speech produced in noise , 1985, ICASSP '85. IEEE International Conference on Acoustics, Speech, and Signal Processing.

[7]  T. D. Hanley,et al.  Effect of level of distracting noise upon speaking rate, duration and intensity. , 1949, The Journal of speech disorders.

[8]  Hong C. Leung,et al.  The Development of Speech Research Tools on MIT's Lisp Machine-based Workstations , 1986 .

[9]  G. Doddington,et al.  Speech recognition in the F-16 cockpit using principal spectral components , 1985, ICASSP '85. IEEE International Conference on Acoustics, Speech, and Signal Processing.

[10]  B. Atal,et al.  Speech analysis and synthesis by linear prediction of the speech wave. , 1971, The Journal of the Acoustical Society of America.

[11]  B. Beek,et al.  An assessment of the technology of automatic speech recognition for military applications , 1977 .