Glossary

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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…

Data-based Synthesis(also: Corpus-based Synthesis, Unit Selection Synthesis)

A speech synthesis technique that generates speech by selecting and concatenating segments from a large database of prerecorded human speech, rather than using rules to generate acoustic waveforms from scratch. The database is indexed with phoneme boundaries, pitch, and prosodic…

Deaf-Accented Speech(also: Deaf Accent, Deaf-Accented English)

Speech produced by Deaf or Hard of Hearing people whose articulation, prosody, and voicing patterns differ from typical hearing speakers because the speaker has limited or no auditory feedback for their own voice. Deaf-accented speech is intelligible to familiar listeners but is…

Diphone(also: Diphone Synthesis)

A unit of speech used in text-to-speech synthesis, consisting of the transition from the middle of one phoneme to the middle of the next. Diphone-based synthesis works by recording a set of all possible phoneme-to-phoneme transitions in a language and concatenating the…

Dragon NaturallySpeaking(also: Dragon Dictation, Dragon Speech Recognition, Nuance Dragon)

Dragon NaturallySpeaking is a commercial speech recognition software product, originally developed by Dragon Systems and later acquired by Nuance Communications (now part of Microsoft). It converts spoken words into text and computer commands, enabling hands-free computer…

DragonDictate(also: Dragon Dictate)

An early discrete speech recognition system developed by Dragon Systems that allowed users to control computers and dictate text by speaking one word at a time with brief pauses between words. Released in the early 1990s, DragonDictate was one of the first commercially viable…

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