ZEROCROSS
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ZEROCROSS - zerocrossing rate
Usage:
ZEROCROSS x sr xmin type
Inputs:
| x | signal | |
| sr | sampling rate in Hz | |
| xmin | threshold | 0 (default) |
| type | Frequency | Period)
|
Outputs:
| y | number of zero crossings |
Function:
In this atom the zero crossings per second are counted, i.e. the points where between the last counted point and the current point, there exists a value xprev >= xmin and the current value xcurr<= 0 or xprev <= xmin and the current value is xcurr >= 0.
So if xmin = 0 all zero crossings, i.e. changes of signs, are counted. If xmin > 0 the signal has to exceed a certain absolute value if another point is to be counted.
