Fixed wing aircraft have fairly broad band vibration characteristics concentrated below 10 Hz, whilst rotary-wing aircraft have discrete, often intense vibration frequencies between 15-25 Hz. Unfortunately major body resonances affecting speech production also occur within these frequency ranges. Research results published by Nixon and Nixon and Sommer have shown how whole-body sinusoidal vertical (Gz) vibration at 6, 8 and 10 Hz, can contribute to a reduction in speech intelligibility. Low frequency whole-body sinusiodal vibration has also been observed by Leeks to cause a reduction in automatic speech recognition accuracy, particularly when speakers are subjected to 10 Hz or 20 Hz Gz vibration at acceleration levels of 0.25 g(rms). This paper describes further experiments which contribute towards the understanding of automatic speech recogniser performance when speakers are subjected to controlled Gz sinusoidal whole-body vibration. Correlations are made between significant increases in recognition error rate and resonance of the abdomen-thorax and head sub-systems of the body.
Effects of low frequency whole-body sinusoidal vibration of automatic speech recognition
Auswirkungen von Vibrationen bei Flugzeugen mit starren Flügeln auf die automatische Spracherkennung
1989
10 Seiten, 5 Bilder, 10 Quellen
Conference paper
English
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