libsent/src/adin/zc-e.c File Reference

Count zero cross and level for speech detection. More...

#include <sent/stddefs.h>

Include dependency graph for zc-e.c:

Go to the source code of this file.

Defines
#define	UNDEF   2
	Undefined mark used for sign.
#define	POSITIVE   1
	Positive mark used for sign.
#define	NEGATIVE   -1
	Negative mark used for sign.
Functions
void	init_count_zc_e (int c_trigger, int c_length, int c_offset)
void	end_count_zc_e ()
int	count_zc_e (SP16 *buf, int step)
int	count_zc_e_level (SP16 *buf, int step, int *levelp)
void	zc_copy_buffer (SP16 *newbuf, int *len)
Variables
static int	trigger
	Level threshold.
static int	length
	Cycle buffer size = number of samples to hold.
static int	offset
	Static data DC offset.
static int *	is_zc
	Zero-crossing point flag list.
static SP16 *	data
	Data cycle buffer.
static int	zero_cross
	Total zerocross num in data.
static int	sign
	Current sign of sample for zerocross counting.
static int	is_trig
	Triggering sign.
static int	top
	Current pointer of buffer.
static int	valid_len
	Valid samples in buffer (for short input).

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Detailed Description

Count zero cross and level for speech detection.

Author:

Akinobu LEE

Date:

Mon Feb 14 19:11:34 2005

Count zero cross number within the given length of cycle buffer. The content of the cycle buffer will be swapped with the newest data, So the input delays for the length of the cycle buffer.

Revision

1.3

Definition in file zc-e.c.

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Function Documentation

void init_count_zc_e	(	int	c_trigger,
		int	c_length,
		int	c_offset
	)

Initialize all parameters and buffers for zero-cross counting.

Parameters:

	c_trigger	[in] Tgigger level threshold
	c_length	[in] Cycle buffer size = Number of samples to hold
	c_offset	[in] Static DC offset of input data

Definition at line 63 of file zc-e.c.

Referenced by adin_cut().

void end_count_zc_e

(

)

End procedure: free all buffers.

Definition at line 91 of file zc-e.c.

Referenced by adin_cut().

int count_zc_e	(	SP16 *	buf,
		int	step
	)

Adding buf[0..step-1] to the cycle buffer and update the count of zero cross. Also swap them with the oldest ones in the cycle buffer.

Parameters:

	buf	[I/O] new samples given, and swapped samples will be returned.
	step	[in] length of above.

Returns:

zero-cross count of the samples in the cycle buffer.

Definition at line 107 of file zc-e.c.

Referenced by adin_cut().

int count_zc_e_level	(	SP16 *	buf,
		int	step,
		int *	levelp
	)

Adding buf[0..step-1] to the cycle buffer and update the count of zero cross. Also swap them with the oldest ones in the cycle buffer. Also get the maximum level in the cycle buffer.

Parameters:

	buf	[I/O] new samples, will be swapped by old samples when returned.
	step	[in] length of above.
	levelp	[out] maximum level in the cycle buffer.

Returns:

zero-cross count of the samples in the cycle buffer.

Definition at line 157 of file zc-e.c.

void zc_copy_buffer	(	SP16 *	newbuf,
		int *	len
	)

Flush samples in the current cycle buffer.

Parameters:

	newbuf	[out] the samples in teh cycle buffer will be written here.
	len	[out] length of above.

Definition at line 205 of file zc-e.c.

Referenced by adin_cut().

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