The ear as a speech analyzer  

Oleh:

Greenberg, S.

Jenis: Article from Journal - ilmiah internasional
Dalam koleksi: Journal of Phonetics vol. 16 no. 1 (Jan. 1988), page 139 - 150.

Ketersediaan

Perpustakaan PKBB Nomor Panggil: 405/JOP/16 Non-tandon: tidak ada Tandon: 1

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Isi artikel

The representation of speech in the auditory periphery is evaluated from the perspectives of physiology and psychoacoustics. Current models fall into one of four broad classes: rate/place, synchrony/place, synchrony/quasi-place and synchrony/place-independent. Each representational type is evaluated in terms of its ability to account for the perceptual features of speech and on the basis of physiological plausibility. The optimum representational form may vary as a function of the acoustic environment. It is suggested that the rate/place representation operates primarily at low sound-pressure levels and for encoding the gross spectral characteristics of the high-frequency portion of a periodic signals, such as stops and fricatives. The synchrony/place and synchrony/quasi-place representations may also play an important role, primarily at low sound-pressure levels and under conditions of low signal-to-noise ratio in the high-frequency auditory channels. The place-independent synchrony pattern may provide the basis for the representation of voiced sounds (particularly vowels) at moderate-to-high sound-pressure levels and for conditions where the signal-to-noise ratio in the low-frequency channels is particularly poor. The "onset" units of the posteroventral cochlear nucleus may act to integrate such across-channel synchronous activity to provide a stable of representation of the signal spectrum in terms of both rate and temporal activity.

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