A voice synthesizer is a device or software that can create and produce artificial or computer-generated sounds that mimic human speech. Full definition
They are the official characters of singing voice synthesizer software developed and owned by Crypton Future Media, INC.. (piapro.net)
«Hatsune Miku», «Kagamine Rin», «Kagamine Len», «Megurine Luka», «KAITO» and «MEIKO» (collectively called the «Piapro Characters») are characters developed for a line of singing voice synthesizer products by Crypton Future Media, INC.. (piapro.net)
The disease confined Hawking to a wheelchair for most of his adult life and eventually rendered him capable of speaking only through a computer - controlled voice synthesizer. (sciencemag.org)