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_techo_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)


Detailed Description


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.

References echo_can_state_t::adaption_mode.

Referenced by echo_can_create().

echo_can_state_t* echo_can_create ( int  len,
int  adaption_mode 
)

void echo_can_flush ( echo_can_state_t ec  ) 

void echo_can_free ( echo_can_state_t ec  ) 

Free a voice echo canceller context.

Parameters:
ec The echo canceller context.

References echo_can_state_t::fir_state, echo_can_state_t::fir_taps16, and echo_can_state_t::fir_taps32.

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.

References echo_can_state_t::adaption_mode, and echo_can_state_t::tx_hpf.

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


Generated on Thu Feb 12 14:16:09 2009 for spandsp by  doxygen 1.5.5