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Glossary

Terms used in accessibility research and practice. Each entry has a definition, common aliases, and category tags.

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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…

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