Glossary
Terms used in accessibility research and practice. Each entry has a definition, common aliases, and category tags.
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- Semantic Hearing(also: Programmable Hearing, Intent-Aware Hearing)
- A research paradigm and class of systems that treat the user's auditory environment as something programmable: rather than uniformly amplifying or suppressing all sound, the wearable headphone or earbud uses on-device machine learning to selectively extract or attenuate specific…
- Sound Pressure Level(also: SPL, Decibel Level)
- A logarithmic measure of sound intensity expressed in decibels (dB), representing the pressure of a sound wave relative to a reference level. In accessibility, SPL is critical for designing auditory feedback systems—sounds must be loud enough to be detected above ambient noise…
- Speech Intelligibility(also: Speech Recognition Score, Word Recognition)
- A measure of how well speech can be understood by a listener, typically expressed as the percentage of words or sentences correctly identified under specific listening conditions. Speech intelligibility is affected by factors including audio bandwidth, background noise, signal…
- Speech Rate(also: Speaking Rate, Articulation Rate)
- The speed at which speech is produced, typically measured in words per minute (WPM) or syllables per second. Normal conversational speech ranges from 120-180 WPM, while screen reader users often configure synthetic speech at rates of 300-400 WPM or higher. Speech rate settings…
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