zcross
Functions
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int main(int argc, char *argv[])
zcross [ option ] [ infile ]
-l int
frame length \((1 \le L)\)
-o int
output format
0number of zero-crossings1zero-crossing rate
infile str
double-type data sequence
stdout
double-type zero-crossing
nrand -s 0 -l 30 | zcross -l 10 | x2x +da # 3, 2, 5
- Parameters:
argc – [in] Number of arguments.
argv – [in] Argument vector.
- Returns:
0 on success, 1 on failure.
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class ZeroCrossingAnalysis
Perform zero-crossing analysis.
The input is the \(L\)-length waveform signals:
\[ \begin{array}{cccc} x(0), & x(1), & \ldots, & x(L-1), \end{array} \]and the output is the number of zero-crossings calculated by\[ \frac{1}{2} \sum_{l=0}^{L-1} |\mathrm{sgn}(x(l)) - \mathrm{sgn}(x(l-1))|. \]where \(\mathrm{sgn}(\cdot)\) returns -1 if the input is negative, otherwise returns 1. Note that \(x(-1)\) is taken from the previous frame.Public Functions
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explicit ZeroCrossingAnalysis(int frame_length)
- Parameters:
frame_length – [in] Frame length in points, \(L\).
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inline int GetFrameLength() const
- Returns:
Frame length.
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inline bool IsValid() const
- Returns:
True if this object is valid.
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bool Run(const std::vector<double> &signals, int *num_zero_crossing, ZeroCrossingAnalysis::Buffer *buffer) const
- Parameters:
signals – [in] \(L\)-length waveform signals.
num_zero_crossing – [out] Number of zero crossings.
buffer – [inout] Buffer.
- Returns:
True on success, false on failure.
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class Buffer
Buffer for ZeroCrossingAnalysis class.
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explicit ZeroCrossingAnalysis(int frame_length)