Conference Paper

An Acoustic Framework for Detecting Fatigue in Speech Based Human-Computer-Interaction.

DOI: 10.1007/978-3-540-70540-6_7 In proceeding of: Computers Helping People with Special Needs, 11th International Conference, ICCHP 2008, Linz, Austria, July 9-11, 2008. Proceedings
Source: DBLP

ABSTRACT This article describes a general framework for detecting accident-prone fatigue states based on prosody, articulation and
speech quality related speech characteristics. The advantages of this real-time measurement approach are that obtaining speech
data is non obtrusive, and free from sensor application and calibration efforts. The main part of the feature computation
is the combination of frame level based speech features and high level contour descriptors resulting in over 8,500 features
per speech sample. In general the measurement process follows the speech adapted steps of pattern recognition: (a) recording
speech, (b) preprocessing (segmenting speech units of interest), (c) feature computation (using perceptual and signal processing
related features, as e.g. fundamental frequency, intensity, pause patterns, formants, cepstral coefficients), (d) dimensionality
reduction (filter and wrapper based feature subset selection, (un-)supervised feature transformation), (e) classification
(e.g. SVM, K-NN classifier), and (f) evaluation (e.g. 10-fold cross validation). The validity of this approach is briefly
discussed by summarizing the empirical results of a sleep deprivation study.

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