modem_echo.c File Reference

#include <stdlib.h>
#include <inttypes.h>
#include <string.h>
#include <stdio.h>
#include <tgmath.h>
#include <math.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.

Generated on 22 Jan 2011 for spandsp by  doxygen 1.6.1