26 #if !defined(_SPANDSP_PRIVATE_V27TER_RX_H_)
27 #define _SPANDSP_PRIVATE_V27TER_RX_H_
32 #define V27TER_EQUALIZER_LEN 32
34 #define V27TER_EQUALIZER_PRE_LEN 16
37 #define V27TER_RX_4800_FILTER_STEPS 27
39 #define V27TER_RX_2400_FILTER_STEPS 27
41 #if V27TER_RX_4800_FILTER_STEPS > V27TER_RX_2400_FILTER_STEPS
42 #define V27TER_RX_FILTER_STEPS V27TER_RX_4800_FILTER_STEPS
44 #define V27TER_RX_FILTER_STEPS V27TER_RX_2400_FILTER_STEPS
72 #if defined(SPANDSP_USE_FIXED_POINT)
int gardner_integrate
Integration variable for damping the Gardner algorithm tests.
Definition: private/v27ter_rx.h:179
void dds_advance(uint32_t *phase_acc, int32_t phase_rate)
Advance the phase, without returning any new signal sample.
Definition: dds_int.c:362
int16_t high_sample
A highest magnitude sample seen.
Definition: private/v27ter_rx.h:148
#define V27TER_TRAINING_SEG_5_LEN
Definition: v27ter_rx.c:96
void v27ter_rx_set_qam_report_handler(v27ter_rx_state_t *s, qam_report_handler_t handler, void *user_data)
Definition: v27ter_rx.c:1144
uint32_t scramble_reg
The register for the training and data scrambler.
Definition: private/v27ter_rx.h:127
int eq_skip
Symbol counter to the next equalizer update.
Definition: private/v27ter_rx.h:173
float agc_scaling_save
The previous value of agc_scaling, needed to reuse old training.
Definition: private/v27ter_rx.h:101
complexi32_t cvec_circular_dot_prodi16(const complexi16_t x[], const complexi16_t y[], int n, int pos)
Find the dot product of two complex int16_t vectors, where the first is a circular buffer with an off...
Definition: complex_vector_int.c:83
void(* modem_status_func_t)(void *user_data, int status)
Definition: async.h:114
@ SIG_STATUS_CARRIER_UP
The carrier signal is up. This merely indicates that carrier energy has been seen....
Definition: async.h:58
#define V27TER_TRAINING_SEG_3_LEN
Definition: v27ter_rx.c:94
void dds_advancef(uint32_t *phase_acc, int32_t phase_rate)
Advance the phase, without returning any new signal sample.
Definition: dds_float.c:2133
int16_t last_sample
The value of the last signal sample, using the a simple HPF for signal power estimation.
Definition: private/v27ter_rx.h:140
float power_meter_current_dbm0(power_meter_t *s)
Get the current power meter reading, in dBm0.
Definition: power_meter.c:120
@ SIG_STATUS_TRAINING_IN_PROGRESS
The modem is training. This is an early indication that the signal seems to be of the right type....
Definition: async.h:63
logging_state_t logging
Error and flow logging control.
Definition: private/v27ter_rx.h:192
int32_t carrier_phase_rate
The update rate for the phase of the carrier (i.e. the DDS increment).
Definition: private/v27ter_rx.h:157
int rrc_filter_step
Current offset into the RRC pulse shaping filter buffer.
Definition: private/v27ter_rx.h:124
int gardner_step
Current step size of Gardner algorithm integration.
Definition: private/v27ter_rx.h:181
int32_t carrier_off_power
The power meter level at which carrier off is declared.
Definition: private/v22bis.h:130
int total_baud_timing_correction
The total symbol timing correction since the carrier came up. This is only for performance analysis p...
Definition: private/v27ter_rx.h:184
int v27ter_rx_release(v27ter_rx_state_t *s)
Release a V.27ter modem receive context.
Definition: v27ter_rx.c:1131
void(* put_bit_func_t)(void *user_data, int bit)
Definition: async.h:105
int32_t carrier_on_power
The power meter level at which carrier on is declared.
Definition: private/v22bis.h:128
int32_t power_meter_update(power_meter_t *s, int16_t amp)
Update a power meter.
Definition: power_meter.c:84
float vec_circular_dot_prodf(const float x[], const float y[], int n, int pos)
Find the dot product of two float vectors, where the first is a circular buffer with an offset for th...
Definition: vector_float.c:852
float agc_scaling
The scaling factor assessed by the AGC algorithm.
Definition: private/v27ter_rx.h:99
int training_bc
The current step in the table of BC constellation positions.
Definition: private/v27ter_rx.h:132
power_meter_t power
A power meter, to measure the HPF'ed signal power in the channel.
Definition: private/v27ter_rx.h:162
SPAN_DECLARE_NONSTD(int) async_tx_get_bit(void *user_data)
Get the next bit of a transmitted serial bit stream.
int baud_half
The current half of the baud.
Definition: private/v27ter_rx.h:176
void v27ter_rx_signal_cutoff(v27ter_rx_state_t *s, float cutoff)
Definition: v27ter_rx.c:158
float eq_delta
The current delta factor for updating the equalizer coefficients.
Definition: private/v27ter_rx.h:104
int carrier_drop_pending
Whether or not a carrier drop was detected and the signal delivery is pending.
Definition: private/v27ter_rx.h:144
float rrc_filter[27]
The root raised cosine (RRC) pulse shaping filter buffer.
Definition: private/v27ter_rx.h:121
Definition: power_meter.h:49
int eq_put_step
Current write offset into the equalizer buffer.
Definition: private/v27ter_rx.h:171
float im
Imaginary part.
Definition: complex.h:47
float dds_phase_to_radians(uint32_t phase)
Convert a 32 bit phase angle to an angle in radians, between 0 and 2*PI.
Definition: dds_float.c:2103
float carrier_track_i
The integral part of the carrier tracking filter.
Definition: private/v27ter_rx.h:119
int low_samples
A count of the current consecutive samples below the carrier off threshold.
Definition: private/v27ter_rx.h:146
#define CARRIER_NOMINAL_FREQ
Definition: v27ter_rx.c:77
void * put_bit_user_data
A user specified opaque pointer passed to the put_bit routine.
Definition: private/v27ter_rx.h:58
#define EQUALIZER_DELTA
Definition: v27ter_rx.c:83
complexi16_t dds_lookup_complexi16(uint32_t phase)
Generate a complex 16 bit integer tone sample.
Definition: dds_int.c:415
int bit_rate
The bit rate of the modem. Valid values are 2400 and 4800.
Definition: private/v27ter_rx.h:54
@ SIG_STATUS_TRAINING_FAILED
The modem has failed to train.
Definition: async.h:67
int bit_rate
The maximum permitted bit rate of the modem. Valid values are 1200 and 2400.
Definition: private/v22bis.h:75
Definition: complex.h:100
put_bit_func_t put_bit
The callback function used to put each bit received.
Definition: private/v22bis.h:83
float v27ter_rx_signal_power(v27ter_rx_state_t *s)
Definition: v27ter_rx.c:152
@ SIG_STATUS_CARRIER_DOWN
The carrier signal has dropped.
Definition: async.h:54
complexf_t dds_lookup_complexf(uint32_t phase)
Lookup the complex value of a specified phase.
Definition: dds_float.c:2176
int32_t im
Imaginary part.
Definition: complex.h:104
void * qam_user_data
A user specified opaque pointer passed to the qam_report callback routine.
Definition: private/v27ter_rx.h:70
int32_t re
Real part.
Definition: complex.h:102
int32_t vec_circular_dot_prodi16(const int16_t x[], const int16_t y[], int n, int pos)
Find the dot product of two int16_t vectors, where the first is a circular buffer with an offset for ...
Definition: vector_int.c:261
int v27ter_rx_free(v27ter_rx_state_t *s)
Free a V.27ter modem receive context.
Definition: v27ter_rx.c:1137
complexf_t cvec_circular_dot_prodf(const complexf_t x[], const complexf_t y[], int n, int pos)
Find the dot product of two complex float vectors, where the first is a circular buffer with an offse...
Definition: complex_vector_float.c:173
int32_t carrier_off_power
The power meter level at which carrier off is declared.
Definition: private/v27ter_rx.h:166
void * status_user_data
A user specified opaque pointer passed to the status function.
Definition: private/v27ter_rx.h:63
int constellation_state
The position of the current symbol in the constellation, used for differential decoding.
Definition: private/v27ter_rx.h:152
int span_log(logging_state_t *s, int level, const char *format,...)
Generate a log entry.
Definition: logging.c:84
Definition: private/v27ter_rx.h:52
complexf_t eq_coeff[32]
The adaptive equalizer coefficients.
Definition: private/v27ter_rx.h:106
int32_t last_angles[2]
The previous symbol phase angles for the coarse carrier aquisition step.
Definition: private/v27ter_rx.h:187
float dds_frequencyf(int32_t phase_rate)
Find the frequency, in Hz, equivalent to a phase rate.
Definition: dds_float.c:2115
int32_t diff_angles[16]
History list of phase angle differences for the coarse carrier aquisition step.
Definition: private/v27ter_rx.h:189
int16_t im
Imaginary part.
Definition: complex.h:93
void v27ter_rx_set_put_bit(v27ter_rx_state_t *s, put_bit_func_t put_bit, void *user_data)
Change the put_bit function associated with a V.27ter modem receive context.
Definition: v27ter_rx.c:1016
float training_error
A measure of how much mismatch there is between the real constellation, and the decoded symbol positi...
Definition: private/v27ter_rx.h:114
int constellation_state
The code number for the current position in the constellation.
Definition: private/v22bis.h:132
int signal_present
>0 if a signal above the minimum is present. It may or may not be a V.27ter signal.
Definition: private/v27ter_rx.h:142
#define V27TER_TRAINING_SEG_6_LEN
Definition: v27ter_rx.c:98
uint32_t carrier_phase
The current phase of the carrier (i.e. the DDS parameter).
Definition: private/v27ter_rx.h:155
int32_t power_meter_level_dbm0(float level)
Get the current power meter reading, in dBm0.
Definition: power_meter.c:91
put_bit_func_t put_bit
The callback function used to put each bit received.
Definition: private/v27ter_rx.h:56
complexf_t eq_coeff_save[32]
A saved set of adaptive equalizer coefficients for use after restarts.
Definition: private/v27ter_rx.h:108
int training_stage
The section of the training data we are currently in.
Definition: private/v27ter_rx.h:136
logging_state_t * v27ter_rx_get_logging_state(v27ter_rx_state_t *s)
Get the logging context associated with a V.27ter modem receive context.
Definition: v27ter_rx.c:1030
int v27ter_rx_restart(v27ter_rx_state_t *s, int bit_rate, int old_train)
Reinitialise an existing V.27ter modem receive context.
Definition: v27ter_rx.c:1036
complexf_t eq_buf[32]
The equalizer signal buffer.
Definition: private/v27ter_rx.h:110
int32_t carrier_on_power
The power meter level at which carrier on is declared.
Definition: private/v27ter_rx.h:164
int eq_step
Current read offset into the equalizer buffer.
Definition: private/v27ter_rx.h:169
float re
Real part.
Definition: complex.h:45
int scrambler_pattern_count
A counter for the number of consecutive bits of repeating pattern through the scrambler.
Definition: private/v27ter_rx.h:130
float v27ter_rx_symbol_timing_correction(v27ter_rx_state_t *s)
Definition: v27ter_rx.c:143
float carrier_track_p
The proportional part of the carrier tracking filter.
Definition: private/v27ter_rx.h:117
int training_count
A count of how far through the current training step we are.
Definition: private/v27ter_rx.h:138
int16_t re
Real part.
Definition: complex.h:91
v27ter_rx_state_t * v27ter_rx_init(v27ter_rx_state_t *s, int bit_rate, put_bit_func_t put_bit, void *user_data)
Initialise a V.27ter modem receive context.
Definition: v27ter_rx.c:1104
power_meter_t * power_meter_init(power_meter_t *s, int shift)
Initialise a power meter context.
Definition: power_meter.c:50
@ SIG_STATUS_TRAINING_SUCCEEDED
The modem has trained, and is ready for data exchange.
Definition: async.h:65
void v27ter_rx_set_modem_status_handler(v27ter_rx_state_t *s, modem_status_func_t handler, void *user_data)
Change the modem status report function associated with a V.27ter modem receive context.
Definition: v27ter_rx.c:1023
int32_t carrier_phase_rate_save
The carrier update rate saved for reuse when using short training.
Definition: private/v27ter_rx.h:159
modem_status_func_t status_handler
The callback function used to report modem status changes.
Definition: private/v27ter_rx.h:61
float v27ter_rx_carrier_frequency(v27ter_rx_state_t *s)
Definition: v27ter_rx.c:137
Definition: private/logging.h:34
qam_report_handler_t qam_report
A callback function which may be enabled to report every symbol's constellation position.
Definition: private/v27ter_rx.h:67
int old_train
TRUE if the previous trained values are to be reused.
Definition: private/v27ter_rx.h:134
int v27ter_rx_equalizer_state(v27ter_rx_state_t *s, complexf_t **coeffs)
Get a snapshot of the current equalizer coefficients.
Definition: v27ter_rx.c:178