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In some cases only the "positive-going" or "negative-going" crossings are counted, rather than all the crossings, since between a pair of adjacent positive zero-crossings there must be a single negative zero-crossing.
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changes from positive to zero to negative or from negative to zero to positive. Its value has been widely used in both
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Proceedings of the COST G-6 Conference on
Digital Audio Effects (DAFX-00 - DAFX-06), Verona, Italy, December 7–9, 2000
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161:{\displaystyle zcr={\frac {1}{T-1}}\sum _{t=1}^{T-1}\mathbb {1} _{\mathbb {R} _{<0}}(s_{t}s_{t-1})}
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On the Use of Zero-crossing Rate for an
Application of Classification of Percussive Sounds
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