echo.h File Reference

#include "fir.h"

Go to the source code of this file.

Classes
struct	echo_can_state_t
Enumerations
enum	{   ECHO_CAN_USE_ADAPTION = 0x01, ECHO_CAN_USE_NLP = 0x02, ECHO_CAN_USE_CNG = 0x04, ECHO_CAN_USE_CLIP = 0x08,   ECHO_CAN_USE_SUPPRESSOR = 0x10, ECHO_CAN_USE_TX_HPF = 0x20, ECHO_CAN_USE_RX_HPF = 0x40, ECHO_CAN_DISABLE = 0x80 }
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_flush (echo_can_state_t *ec)
void	echo_can_adaption_mode (echo_can_state_t *ec, int adaption_mode)
int16_t	echo_can_update (echo_can_state_t *ec, int16_t tx, int16_t rx)
int16_t	echo_can_hpf_tx (echo_can_state_t *ec, int16_t tx)
void	echo_can_snapshot (echo_can_state_t *ec)

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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.
	adaption_mode	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_hpf_tx	(	echo_can_state_t *	ec,
		int16_t	tx
	)

Process to high pass filter the tx signal.

Parameters:

	ec	The echo canceller context.
	tx	The transmitted auio sample.

Returns:

The HP filtered transmit sample, send this to your D/A.

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.