Non-stationary, filter-stable acoustic objects
نویسندگان
چکیده
In spite of the undisputedly high degree of non-stationarity of speech signals, the present day determination of its acoustic features is based on the assumption that speech production can be described as a linear time invariant (LTI) system on the time scale of about 20 ms [1]. In automatic speech recognition, the wide sense stationarity of an LTI–system is used as prerequisite for the consistent estimation of Fourier spectra or of autoregressive models [1]. As an evolutionarily plausible supplement, speech perception is also assumed to be focussed on acoustic features which are obtained by using the LTI assumption [2]. Present day models of pitch perception are no exception [2, 3].
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