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The speech synthesis tool VowelQuest is a piece of software for phonetic/phonological research into vowel systems.
VowelQuest allows the user to pinpoint vowels in the acoustic space, by identifying what constitutes aurally the best fit to each of the vowels in their language. The tool provides as output the list of formant frequencies that correspond to these perceptually identified vowels.
The speech synthesis tool Xphthong is software for phonetic/phonological research into vowel systems.
This tool allows the user to generate a monophthong (a sound with just one vowel target, like the vowel [ɒ] in English pot [pʰɒt]), diphthong (2 vowel targets, like the [aɪ] in English type [tʰaɪp]), triphthong (3 targets, as in English iron [aɪə]), or any higher number of successive vowel targets, hence the name ‘X-phthong’, where X refers to the number of targets.