fsk.c File Reference

#include <inttypes.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include "spandsp/telephony.h"
#include "spandsp/complex.h"
#include "spandsp/dds.h"
#include "spandsp/power_meter.h"
#include "spandsp/async.h"
#include "spandsp/fsk.h"

Functions
fsk_tx_state_t *	fsk_tx_init (fsk_tx_state_t *s, fsk_spec_t *spec, get_bit_func_t get_bit, void *user_data)
	Initialise an FSK modem transmit context.
int	fsk_tx (fsk_tx_state_t *s, int16_t *amp, int len)
	Generate a block of FSK modem audio samples.
void	fsk_tx_power (fsk_tx_state_t *s, float power)
	Adjust an FSK modem transmit context's power output.
void	fsk_tx_set_get_bit (fsk_tx_state_t *s, get_bit_func_t get_bit, void *user_data)
void	fsk_rx_signal_cutoff (fsk_rx_state_t *s, float cutoff)
	Adjust an FSK modem receive context's carrier detect power threshold.
float	fsk_rx_signal_power (fsk_rx_state_t *s)
void	fsk_rx_set_put_bit (fsk_rx_state_t *s, put_bit_func_t put_bit, void *user_data)
fsk_rx_state_t *	fsk_rx_init (fsk_rx_state_t *s, fsk_spec_t *spec, int sync_mode, put_bit_func_t put_bit, void *user_data)
	Initialise an FSK modem receive context.
int	fsk_rx (fsk_rx_state_t *s, const int16_t *amp, int len)
	Process a block of received FSK modem audio samples.
Variables
fsk_spec_t	preset_fsk_specs []

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Detailed Description

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Function Documentation

int fsk_rx	(	fsk_rx_state_t *	s,
		const int16_t *	amp,
		int	len
	)

Process a block of received FSK modem audio samples.

Process a block of received FSK modem audio samples.

Parameters:

	s	The modem context.
	amp	The audio sample buffer.
	len	The number of samples in the buffer.

Returns:

The number of samples unprocessed.

fsk_rx_state_t* fsk_rx_init	(	fsk_rx_state_t *	s,
		fsk_spec_t *	spec,
		int	sync_mode,
		put_bit_func_t	put_bit,
		void *	user_data
	)

Initialise an FSK modem receive context.

Initialise an FSK modem receive context.

Parameters:

	s	The modem context.
	spec	The specification of the modem tones and rate.
	sync_mode	TRUE for synchronous modem. FALSE for asynchronous mode.
	put_bit	The callback routine used to put the received data.
	user_data	An opaque pointer.

Returns:

A pointer to the modem context, or NULL if there was a problem.

void fsk_rx_signal_cutoff	(	fsk_rx_state_t *	s,
		float	cutoff
	)

Adjust an FSK modem receive context's carrier detect power threshold.

Adjust an FSK modem receive context's carrier detect power threshold.

Parameters:

	s	The modem context.
	power	The power level, in dBm0

float fsk_rx_signal_power

(

fsk_rx_state_t *

s

)

Get the current received signal power.

Parameters:

s

The modem context.

Returns:

The signal power, in dBm0.

int fsk_tx	(	fsk_tx_state_t *	s,
		int16_t *	amp,
		int	len
	)

Generate a block of FSK modem audio samples.

Generate a block of FSK modem audio samples.

Parameters:

	s	The modem context.
	amp	The audio sample buffer.
	len	The number of samples to be generated.

Returns:

The number of samples actually generated.

fsk_tx_state_t* fsk_tx_init	(	fsk_tx_state_t *	s,
		fsk_spec_t *	spec,
		get_bit_func_t	get_bit,
		void *	user_data
	)

Initialise an FSK modem transmit context.

Initialise an FSK modem transmit context.

Parameters:

	s	The modem context.
	spec	The specification of the modem tones and rate.
	get_bit	The callback routine used to get the data to be transmitted.
	user_data	An opaque pointer.

Returns:

A pointer to the modem context, or NULL if there was a problem.

void fsk_tx_power	(	fsk_tx_state_t *	s,
		float	power
	)

Adjust an FSK modem transmit context's power output.

Adjust an FSK modem transmit context's power output.

Parameters:

	s	The modem context.
	power	The power level, in dBm0

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