title: An acoustic key to eight languages/dialects: Factor analyses of critical-band-filtered speech.
abstract: The peripheral auditory system functions like a frequency analyser, often modelled as a bank of non-overlapping band-pass filters called critical bands; 20 bands are necessary for simulating frequency resolution of the ear within an ordinary frequency range of speech (up to 7,000 Hz). A far smaller number of filters seemed sufficient, however, to re-synthesise intelligible speech sentences with power fluctuations of the speech signals passing through them; nevertheless, the number and frequency ranges of the frequency bands for efficient speech communication are yet unknown. We derived four common frequency bands-covering approximately 50-540, 540-1,700, 1,700-3,300, and above 3,300 Hz-from factor analyses of spectral fluctuations in eight different spoken languages/dialects. The analyses robustly led to three factors common to all languages investigated-the low &mid-high factor related to the two separate frequency ranges of 50-540 and 1,700-3,300 Hz, the mid-low factor the range of 540-1,700 Hz, and the high factor the range above 3,300 Hz-in these different languages/dialects, suggesting a language universal.
authors.affiliation: Kyushu University, Department of Human Science/Research Center for Applied Perceptual Science, Fukuoka, 815-8540, Japan.
authors.forename: Kazuo
authors.initials: K
authors.lastname: Ueda
authors.affiliation: Kyushu University, Department of Human Science/Research Center for Applied Perceptual Science, Fukuoka, 815-8540, Japan.
authors.forename: Yoshitaka
authors.initials: Y
authors.lastname: Nakajima
mesh_terms: D000161:Acoustic Stimulation; D005163:Factor Analysis, Statistical; D005260:Female; D006801:Humans; D007802:Language; D008297:Male; D013060:Speech; D013061:Speech Acoustics; D013067:Speech Perception