Japanese forensic phonetics: non-contemporaneous within-speaker variation in natural and read-out speech

This paper aims to explore non-contemporaneous withinspeaker variation of a Japanese male speaker, focusing on the difference between speech styles, viz.. natural speech and read-out speech. Recordings under forensic conditions are mostly of natural speech. A suspect’s recording to be compared are, however, sometimes read-out speech, but not natural speech, in order to obtain the similar phonological conditions to the original criminal speech. This paper aims to examine the validity of such a procedure.