Glossary
Terms used in accessibility research and practice. Each entry has a definition, common aliases, and category tags.
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- Signal Drift(also: Baseline Drift, DC Drift)
- Signal drift is the gradual, unintended change in the baseline level of a measured signal over time, caused by factors unrelated to the intended measurement. In bio-electrical sensing for assistive technology, drift is a major challenge — for example, in electrooculography…
- Spatio-Temporal Modulation(also: STM)
- A rendering technique used in mid-air ultrasound haptics in which a single focal point is moved rapidly along a closed trajectory (commonly circular) while its intensity is modulated over time. When the trajectory is swept fast enough (typically tens to hundreds of Hz), the skin…
- Spectrogram(also: Sonogram, Spectral Display)
- A spectrogram is a visual representation of the frequency spectrum of a signal as it varies over time, typically showing time on the horizontal axis, frequency on the vertical axis, and intensity represented by color or brightness. In speech science and accessibility research,…
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