Glossary
Terms used in accessibility research and practice. Each entry has a definition, common aliases, and category tags.
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- Formant(also: Vocal Formant, Formant Frequency)
- A concentration of acoustic energy around a particular frequency in the speech signal, produced by the resonance of the vocal tract. Formants are labeled sequentially (F1, F2, F3, etc.) from lowest to highest frequency and are key to distinguishing different vowel sounds and…
- Fringe Vocabulary(also: Fringe Words, Context-Specific Vocabulary)
- Topic-specific or situation-specific words in an AAC system, typically nouns and other content words that are needed in particular contexts but not used frequently across all conversations. Examples include words like "dinosaur" at a museum, "swing" at a playground, or…
- Fundamental Frequency(also: F0, Pitch Frequency, Voice Pitch)
- The lowest frequency of a periodic sound wave, corresponding to the rate at which the vocal folds vibrate during voiced speech. Fundamental frequency (F0) is perceived by listeners as pitch and is a primary component of prosody — the rhythm, stress, and intonation of speech. F0…
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