Glossary
Terms used in accessibility research and practice. Each entry has a definition, common aliases, and category tags.
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- Hearing Aid Compatibility(also: HAC, HAC Rating)
- Federal Communications Commission (FCC) requirements and ratings for telephones to work effectively with hearing aids and cochlear implants. HAC standards address acoustic coupling (how well the phone works with hearing aid microphones) and telecoil coupling (magnetic signal…
- Narrowband Audio(also: NB Audio, Standard Definition Voice)
- Audio transmission limited to the frequency range of approximately 300-3,400 Hz, which has historically been the standard for telephone networks (PSTN). While sufficient for basic speech intelligibility, narrowband audio excludes higher frequency consonant sounds that aid speech…
- Telecoil(also: T-Coil, Telephone Coil, Induction Coil)
- A small copper coil inside a hearing aid or cochlear implant processor that picks up magnetic signals and converts them to sound. Telecoils allow hearing device users to receive audio directly from telephones, loop systems, and other compatible devices while reducing background…
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