7.5.5. Time Domain Features
Zero-Crossing Rate
The zero-crossing rate is defined as
where
This is a measure of the noisiness of the signal. Thus, unvoiced speech signals have higher zero-crossing values compared to the voiced ones. Temporal curves of variation of the zero-crossing rate from frame to frame may also be informative of the type of signal.
Energy
This is a very simple feature, defined as
and it can be used to discriminate voiced from ...
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