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This paper presents summary evidence for the relative intelligibility of speech synthesised using formant coding, and both uniform and auditorily scaled quantisation of the frequency spectrum. It shows that auditory quantisation in the region of IBark provides the highest and most consistent intelligibility of the systems evaluted both overall, and amongst individual phonetic segments.
Bibliographic reference. Clark, John E. / Mannell, Robert H. (1989): "Frequency resolution effects effects on phonetic level perception of synthesized speech", In SIOA-1989, Vol.2, 31-34.