Go to the source code of this file.
Defines | |
#define | _SPANDSP_V29RX_H_ |
#define | V29_EQUALIZER_PRE_LEN 16 |
#define | V29_EQUALIZER_POST_LEN 14 |
#define | V29_RX_FILTER_STEPS 27 |
Typedefs | |
typedef void(* | qam_report_handler_t )(void *user_data, const complexf_t *constel, const complexf_t *target, int symbol) |
typedef struct v29_rx_state_s | v29_rx_state_t |
Functions | |
v29_rx_state_t * | v29_rx_init (v29_rx_state_t *s, int bit_rate, put_bit_func_t put_bit, void *user_data) |
Initialise a V.29 modem receive context. | |
int | v29_rx_restart (v29_rx_state_t *s, int bit_rate, int old_train) |
Reinitialise an existing V.29 modem receive context. | |
int | v29_rx_free (v29_rx_state_t *s) |
Free a V.29 modem receive context. | |
logging_state_t * | v29_rx_get_logging_state (v29_rx_state_t *s) |
void | v29_rx_set_put_bit (v29_rx_state_t *s, put_bit_func_t put_bit, void *user_data) |
Change the put_bit function associated with a V.29 modem receive context. | |
void | v29_rx_set_modem_status_handler (v29_rx_state_t *s, modem_rx_status_func_t handler, void *user_data) |
Change the modem status report function associated with a V.29 modem receive context. | |
int | v29_rx (v29_rx_state_t *s, const int16_t amp[], int len) |
Process a block of received V.29 modem audio samples. | |
int | v29_rx_equalizer_state (v29_rx_state_t *s, complexf_t **coeffs) |
Get a snapshot of the current equalizer coefficients. | |
float | v29_rx_carrier_frequency (v29_rx_state_t *s) |
float | v29_rx_symbol_timing_correction (v29_rx_state_t *s) |
float | v29_rx_signal_power (v29_rx_state_t *s) |
void | v29_rx_signal_cutoff (v29_rx_state_t *s, float cutoff) |
void | v29_rx_set_qam_report_handler (v29_rx_state_t *s, qam_report_handler_t handler, void *user_data) |
typedef struct v29_rx_state_s v29_rx_state_t |
V.29 modem receive side descriptor. This defines the working state for a single instance of a V.29 modem receiver.
int v29_rx | ( | v29_rx_state_t * | s, | |
const int16_t | amp[], | |||
int | len | |||
) |
Process a block of received V.29 modem audio samples.
Process a block of received V.29 modem audio samples.
s | The modem context. | |
amp | The audio sample buffer. | |
len | The number of samples in the buffer. |
References v29_rx_state_s::agc_scaling, v29_rx_state_s::agc_scaling_save, v29_rx_state_s::bit_rate, v29_rx_state_s::carrier_drop_pending, v29_rx_state_s::carrier_phase, v29_rx_state_s::carrier_phase_rate, dds_advance(), dds_advancef(), dds_lookup_complexf(), dds_lookup_complexi16(), v29_rx_state_s::eq_put_step, v29_rx_state_s::high_sample, complexf_t::im, v29_rx_state_s::last_sample, v29_rx_state_s::low_samples, v29_rx_state_s::power, power_meter_init(), power_meter_update(), complexf_t::re, v29_rx_state_s::rrc_filter, v29_rx_state_s::rrc_filter_step, SIG_STATUS_CARRIER_DOWN, SIG_STATUS_CARRIER_UP, v29_rx_state_s::signal_present, v29_rx_state_s::symbol_sync_high, v29_rx_state_s::symbol_sync_low, v29_rx_state_s::training_stage, v29_rx_restart(), vec_circular_dot_prodf(), and vec_circular_dot_prodi16().
float v29_rx_carrier_frequency | ( | v29_rx_state_t * | s | ) |
Get the current received carrier frequency.
s | The modem context. |
References v29_rx_state_s::carrier_phase_rate, and dds_frequencyf().
int v29_rx_equalizer_state | ( | v29_rx_state_t * | s, | |
complexf_t ** | coeffs | |||
) |
Get a snapshot of the current equalizer coefficients.
Get a snapshot of the current equalizer coefficients.
s | The modem context. | |
coeffs | The vector of complex coefficients. |
References v29_rx_state_s::eq_coeff.
int v29_rx_free | ( | v29_rx_state_t * | s | ) |
Free a V.29 modem receive context.
Free a V.29 modem receive context.
s | The modem context. |
v29_rx_state_t* v29_rx_init | ( | v29_rx_state_t * | s, | |
int | bit_rate, | |||
put_bit_func_t | put_bit, | |||
void * | user_data | |||
) |
Initialise a V.29 modem receive context.
Initialise a V.29 modem receive context.
s | The modem context. | |
bit_rate | The bit rate of the modem. Valid values are 4800, 7200 and 9600. | |
put_bit | The callback routine used to put the received data. | |
user_data | An opaque pointer passed to the put_bit routine. |
References v29_rx_state_s::logging, v29_rx_state_s::put_bit, v29_rx_state_s::put_bit_user_data, v29_rx_restart(), and v29_rx_signal_cutoff().
int v29_rx_restart | ( | v29_rx_state_t * | s, | |
int | bit_rate, | |||
int | old_train | |||
) |
Reinitialise an existing V.29 modem receive context.
Reinitialise an existing V.29 modem receive context.
s | The modem context. | |
bit_rate | The bit rate of the modem. Valid values are 4800, 7200 and 9600. | |
old_train | TRUE if a previous trained values are to be reused. |
References v29_rx_state_s::agc_scaling, v29_rx_state_s::agc_scaling_save, v29_rx_state_s::baud_half, v29_rx_state_s::baud_phase, v29_rx_state_s::bit_rate, v29_rx_state_s::carrier_drop_pending, v29_rx_state_s::carrier_phase, v29_rx_state_s::carrier_phase_rate, v29_rx_state_s::carrier_phase_rate_save, v29_rx_state_s::carrier_track_i, v29_rx_state_s::carrier_track_p, v29_rx_state_s::constellation_state, dds_phase_ratef(), v29_rx_state_s::eq_skip, v29_rx_state_s::high_sample, v29_rx_state_s::last_sample, v29_rx_state_s::low_samples, v29_rx_state_s::old_train, v29_rx_state_s::power, power_meter_init(), v29_rx_state_s::rrc_filter, v29_rx_state_s::rrc_filter_step, v29_rx_state_s::scramble_reg, v29_rx_state_s::signal_present, v29_rx_state_s::symbol_sync_dc_filter, v29_rx_state_s::symbol_sync_high, v29_rx_state_s::symbol_sync_low, v29_rx_state_s::total_baud_timing_correction, v29_rx_state_s::training_cd, v29_rx_state_s::training_count, v29_rx_state_s::training_scramble_reg, and v29_rx_state_s::training_stage.
Referenced by v29_rx(), and v29_rx_init().
void v29_rx_set_modem_status_handler | ( | v29_rx_state_t * | s, | |
modem_rx_status_func_t | handler, | |||
void * | user_data | |||
) |
Change the modem status report function associated with a V.29 modem receive context.
Change the modem status report function associated with a V.29 modem receive context.
s | The modem context. | |
handler | The callback routine used to report modem status changes. | |
user_data | An opaque pointer. |
References v29_rx_state_s::status_handler, and v29_rx_state_s::status_user_data.
void v29_rx_set_put_bit | ( | v29_rx_state_t * | s, | |
put_bit_func_t | put_bit, | |||
void * | user_data | |||
) |
Change the put_bit function associated with a V.29 modem receive context.
Change the put_bit function associated with a V.29 modem receive context.
s | The modem context. | |
put_bit | The callback routine used to handle received bits. | |
user_data | An opaque pointer. |
References v29_rx_state_s::put_bit, and v29_rx_state_s::put_bit_user_data.
void v29_rx_set_qam_report_handler | ( | v29_rx_state_t * | s, | |
qam_report_handler_t | handler, | |||
void * | user_data | |||
) |
Set a handler routine to process QAM status reports
s | The modem context. | |
handler | The handler routine. | |
user_data | An opaque pointer passed to the handler routine. |
References v29_rx_state_s::qam_report, and v29_rx_state_s::qam_user_data.
void v29_rx_signal_cutoff | ( | v29_rx_state_t * | s, | |
float | cutoff | |||
) |
Set the power level at which the carrier detection will cut in
s | The modem context. | |
cutoff | The signal cutoff power, in dBm0. |
References v29_rx_state_s::carrier_off_power, v29_rx_state_s::carrier_on_power, and power_meter_level_dbm0().
Referenced by v29_rx_init().
float v29_rx_signal_power | ( | v29_rx_state_t * | s | ) |
Get the current received signal power.
s | The modem context. |
References v29_rx_state_s::power, and power_meter_current_dbm0().
float v29_rx_symbol_timing_correction | ( | v29_rx_state_t * | s | ) |
Get the current symbol timing correction since startup.
s | The modem context. |
References v29_rx_state_s::total_baud_timing_correction.