How are unvoiced vowels represented in IPA？


As far as I know, there are some unvoiced vowels in Japanese. For example,
when 「す」 is at the end od a sentence, it will sound like [s]. Such process is
referred to as 「無声化」. I wonder how to represent these unvoiced vowels in IPA？




IPA has the devoicing diacritic ◌̥ (ring below) — you can see this used in the
narrow transcriptions on Wiktionary for Japanese words that have devoicing
such as [好き](https://en.wiktionary.org/wiki/%E5%A5%BD%E3%81%8D).

