Zero crossing rate

Typedefs
typedef struct SDTZeroCrossing	SDTZeroCrossing
	Opaque data structure for a zero crossing rate detector object.
typedef struct SDTZeroCrossing	SDTZeroCrossing
	Opaque data structure for a zero crossing rate detector object.

Functions
SDTZeroCrossing *	SDTZeroCrossing_new (unsigned int size)
	Instantiates a zero crossing rate detector. More...
void	SDTZeroCrossing_free (SDTZeroCrossing *x)
	Destroys a zero crossing rate detector. More...
void	SDTZeroCrossing_setOverlap (SDTZeroCrossing *x, double f)
	Sets the analysis window overlapping ratio. Accepted values go from 0.0 to 1.0, with 0.0 meaning no overlap and 1.0 meaning total overlap. More...
int	SDTZeroCrossing_dsp (SDTZeroCrossing *x, double *out, double in)
	Signal processing routine. Call this function at sample rate to perform signal analysis. More...

Detailed Description

Zero crossing rate signal analyzer.

Function Documentation

int SDTZeroCrossing_dsp	(	SDTZeroCrossing *	x,
		double *	out,
		double	in
	)

Signal processing routine. Call this function at sample rate to perform signal analysis.

Parameters

[in]	x	Pointer to the instance
[out]	out	Pointer to a double containing the algorithm output
[in]	in	Input sample

Returns

1 if output available (analysis window full), 0 otherwise

void SDTZeroCrossing_free

(

SDTZeroCrossing *

x

)

Destroys a zero crossing rate detector.

Parameters

[in]

x

Pointer to the instance to destroy

SDTZeroCrossing * SDTZeroCrossing_new

(

unsigned int

size

)

Instantiates a zero crossing rate detector.

Parameters

[in]

size

Size of the analysis window, in samples

Returns

Pointer to the new instance

void SDTZeroCrossing_setOverlap	(	SDTZeroCrossing *	x,
		double	f
	)

Sets the analysis window overlapping ratio. Accepted values go from 0.0 to 1.0, with 0.0 meaning no overlap and 1.0 meaning total overlap.

Parameters

[in]	x	Pointer to the instance
[in]	f	Overlap ratio [0.0, 1.0]