modem_echo.c File Reference

#include <stdlib.h>
#include <inttypes.h>
#include <string.h>
#include <stdio.h>
#include "floating_fudge.h"
#include "spandsp/telephony.h"
#include "spandsp/bit_operations.h"
#include "spandsp/dc_restore.h"
#include "spandsp/modem_echo.h"

Functions

modem_echo_can_state_tmodem_echo_can_create (int len)
void modem_echo_can_free (modem_echo_can_state_t *ec)
void modem_echo_can_flush (modem_echo_can_state_t *ec)
void modem_echo_can_adaption_mode (modem_echo_can_state_t *ec, int adapt)
int16_t modem_echo_can_update (modem_echo_can_state_t *ec, int16_t tx, int16_t rx)

Detailed Description


Function Documentation

void modem_echo_can_adaption_mode ( modem_echo_can_state_t ec,
int  adapt 
)

Set the adaption mode of a modem echo canceller context.

Parameters:
ec The echo canceller context.
adapt The mode.

modem_echo_can_state_t* modem_echo_can_create ( int  len  ) 

Create a modem echo canceller context.

Parameters:
len The length of the canceller, in samples. eturn The new canceller context, or NULL if the canceller could not be created.

References modem_echo_can_state_t::fir_taps16, and modem_echo_can_state_t::fir_taps32.

void modem_echo_can_flush ( modem_echo_can_state_t ec  ) 

Flush (reinitialise) a modem echo canceller context.

Parameters:
ec The echo canceller context.

void modem_echo_can_free ( modem_echo_can_state_t ec  ) 

Free a modem echo canceller context.

Parameters:
ec The echo canceller context.

int16_t modem_echo_can_update ( modem_echo_can_state_t ec,
int16_t  tx,
int16_t  rx 
)

Process a sample through a modem echo canceller.

Parameters:
ec The echo canceller context.
tx The transmitted audio sample.
rx The received audio sample. eturn The clean (echo cancelled) received sample.


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