zcross

Functions

int main(int argc, char *argv[])

zcross [ option ] [ infile ]

• -l int

  • frame length $(1\le L)$

• -o int

  • output format

    • 0 number of zero-crossings

    • 1 zero-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.

class ZeroCrossingAnalysis

Perform zero-crossing analysis.

The input is the $L$-length waveform signals:

$$\begin{array}{cccc}x(0),& x(1),& \dots ,& x(L-1),\end{array}$$

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

explicit ZeroCrossingAnalysis(int frame_length)

Parameters:

frame_length – [in] Frame length in points, $L$.

inline int GetFrameLength() const

Returns:

Frame length.

inline bool IsValid() const

Returns:

True if this object is valid.

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.

class Buffer

Buffer for ZeroCrossingAnalysis class.