Synthetic fricatives with two spectral peaks scanning a wide range of frequencies were put into three versions of the context [a_'ɛ:], also generated synthetically, and imitating a male speaker (1), a child (2), and an aroused male speaker (3) with elevated F0 and F1. The stimuli were presented in two orders, with increasing or decreasing frequencies of the spectral peaks, to 16 speakers of Swedish who identified the fricatives as [f], [s], [ɕ], [ʂ], or [ɧ]. In a given context, the obtained phonetic boundaries followed mainly the spectral peak lowest in frequency, while the upper peak contributed only marginally even if it was at a distance less than the "critical distance" of about 3 Bark. In context (2), as conpared with (1), the phonetic boundaries were shifted up, but less (in Bark) than the vowel formants.
1987. Vol. 5: 205-208 p.