Pitch Detection

The computational process of determining the fundamental frequency (pitch) of an audio signal in real time. In accessibility, pitch detection is used in non-speech voice interfaces where changes in humming or vocal pitch are mapped to control commands — for example, a rising pitch might move a cursor right while a falling pitch moves it left. Pitch detection algorithms, often based on autocorrelation, analyse the periodicity of the sound waveform to estimate frequency. The technique is also used in hearing aid processing, speech therapy tools, and musical accessibility applications. Accurate pitch detection is essential for making non-speech acoustic input reliable enough for practical use as an assistive input method.