Wolfgang Wokurek

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We address the possibility of combining the results from hemodynamic and electrophysiological methods for the study of cognitive processing of language. The hemodynamic method we use is Event-Related fMRI, and the electrophysiological method measures Event-Related Band Power (ERBP) of the EEG signal. The experimental technique allows us to approach the(More)
This paper investigates the influence of different types of disturbances to the estimation of voice quality parameters. Here, voice quality is not only based on the pitch or pitch contour as in many approaches. The parameters are estimated by spectral gradients of the vocal tract compensated speech signal. We present a set of five parameters for describing(More)
It is difficult to recognize accented or non-native speech with speech recognition systems that are trained using native speech. While standard acoustic speaker adaptation techniques are often applied in these cases, they can only reduce the recognition errors that are due to mispronunciations on the phoneme level. They are not able to handle severe(More)
In this study Hidden Markov models are employed for the automatic classiication of pitch accents in German utterances. A sim-pliied version of the tone sequence model (i.e. a linguistic theory of pitch accents) is applied. In this approach only two of the nuclear tones (rise, fall) are used. They are represented by continuous density Hidden Markov models.(More)
Simultaneous recordings of the laryngograph signal and speech recorded in an non-reverberating environment are investigated for acoustic evidence of the glottal opening within the microphone signal. It is demonstrated that the high resolution time-frequency analysis of the microphone signal by the smoothed pseudo Wigner distribution (SPWD) shows responses(More)