maad.features.zero_crossing_rate

maad.features.zero_crossing_rate(s, fs, roi=None)[source]

Compute the zero crossing rate feature of an audio signal.

The zero-crossing rate is the rate of sign-changes along a signal, i.e., the rate at which the signal changes from positive to zero to negative or from negative to zero to positive. This feature has been used widely in speech recognition and music information retrieval, being a key feature to classify percussive sounds [1].

Parameters:

s1D array: Audio to process (wav)
fsfloat: Sampling frequency of audio signal
roipandas.Series, optional: Region of interest where peak frequency will be computed. Series must have a valid input format with index: min_t, min_f, max_t, max_f. The default is None.

Returns:

zcrfloat: number of zero crossing /s

References

[1]

https://en.wikipedia.org/wiki/Zero-crossing_rate

Examples

>>> from maad import sound, features
>>> s, fs = sound.load('../data/spinetail.wav')
>>> features.zero_crossing_rate(s,fs)
10500.397192384766