echo.c File Reference

#include <stdlib.h>
#include <inttypes.h>
#include <string.h>
#include <stdio.h>
#include "spandsp/telephony.h"
#include "spandsp/logging.h"
#include "spandsp/bit_operations.h"
#include "spandsp/echo.h"

Defines
#define	NULL   (void *) 0
#define	MIN_TX_POWER_FOR_ADAPTION   64*64
#define	MIN_RX_POWER_FOR_ADAPTION   64*64
Functions
echo_can_state_t *	echo_can_create (int len, int adaption_mode)
void	echo_can_free (echo_can_state_t *ec)
void	echo_can_adaption_mode (echo_can_state_t *ec, int adaption_mode)
void	echo_can_flush (echo_can_state_t *ec)
int16_t	echo_can_update (echo_can_state_t *ec, int16_t tx, int16_t rx)
Variables
int	sample_no = 0

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Detailed Description

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Function Documentation

void echo_can_adaption_mode (  echo_can_state_t *  ec, int  adaption_mode )

Set the adaption mode of a voice echo canceller context. Parameters: ec  The echo canceller context. adapt  The mode.

echo_can_state_t* echo_can_create (  int  len, int  adaption_mode )

Create a voice echo canceller context. Parameters: len  The length of the canceller, in samples. Returns: The new canceller context, or NULL if the canceller could not be created.

void echo_can_flush (  echo_can_state_t *  ec  )

Flush (reinitialise) a voice echo canceller context. Parameters: ec  The echo canceller context.

void echo_can_free (  echo_can_state_t *  ec  )

Free a voice echo canceller context. Parameters: ec  The echo canceller context.

int16_t echo_can_update (  echo_can_state_t *  ec, int16_t  tx, int16_t  rx )

Process a sample through a voice echo canceller. Parameters: ec  The echo canceller context. tx  The transmitted audio sample. rx  The received audio sample. Returns: The clean (echo cancelled) received sample.

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