Zero-crossing rate
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The zero-crossing rate is the rate of sign-changes along a signal. This feature has been used heavily in both speech recognition and music information retrieval and is defined formally as
- <math>zcr = \frac{1}{T} \sum_{t=0}^{T-1} {{\mathbb I}\left\{{s_t s_{t-1} < 0}\right\}}</math>
where <math>s</math> is a signal of length <math>T</math> and the indicator function <math>{{\mathbb I}\left\{{A}\right\}}</math> is 1 if its argument <math>A</math> is true and 0 otherwise.
For monophonic tonal signals, the zero-crossing rate can be used as a primitive pitch detection algorithm.
[edit] See also
[edit] References
- Fabien Gouyon, Francois Pachet, Olivier Delerue (2000), On the Use of Zero-Crossing Rate for an Application of Classification of Percussive Sounds, in Proceedings of the COST G-6 Conference on Digital Audio Effects (DAFX-00), Verona, Italy, December 7-9, 2000. Accessed 7th Oct 2006.
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