DECTalk

A text-to-speech synthesis system originally developed by Digital Equipment Corporation in the 1980s, using rule-based formant synthesis to generate speech from text input. DECTalk offered several preset voices (including "Paul" and "Betty") and was widely adopted in AAC communication devices and assistive technology products due to its acceptable intelligibility and compact rule set. Although newer concatenative and neural synthesis technologies produce more natural-sounding speech, DECTalk voices remain culturally significant in the disability community — notably, physicist Stephen Hawking used a DECTalk-derived voice and declined to upgrade because it had become part of his identity.