26#if !defined(_SPANDSP_PRIVATE_V17RX_H_)
27#define _SPANDSP_PRIVATE_V17RX_H_
33#define V17_EQUALIZER_LEN 17
36#define V17_EQUALIZER_PRE_LEN 8
39#define V17_RX_FILTER_STEPS 27
46#define V17_TRELLIS_STORAGE_DEPTH 16
48#define V17_TRELLIS_LOOKBACK_DEPTH 16
77 int16_t power_window[40];
80 int64_t window_power_save;
82#if defined(SPANDSP_USE_FIXED_POINTx)
228#if defined(SPANDSP_USE_FIXED_POINTx)
void(* modem_status_func_t)(void *user_data, int status)
Definition async.h:114
void(* put_bit_func_t)(void *user_data, int bit)
Definition async.h:105
struct logging_state_s logging_state_t
Definition logging.h:75
Definition power_meter.h:49
Definition private/v17rx.h:55
float symbol_sync_low[2]
Definition private/v17rx.h:135
qam_report_handler_t qam_report
A callback function which may be enabled to report every symbol's constellation position.
Definition private/v17rx.h:70
int32_t carrier_off_power
The power meter level at which carrier off is declared.
Definition private/v17rx.h:196
complexf_t eq_coeff[17]
The adaptive equalizer coefficients.
Definition private/v17rx.h:128
int32_t start_angles[2]
Starting phase angles for the coarse carrier aquisition step.
Definition private/v17rx.h:213
int32_t carrier_phase_rate_save
The carrier update rate saved for reuse when using short training.
Definition private/v17rx.h:189
int space_map
A pointer to the current space map. There is a space map for each trellis state.
Definition private/v17rx.h:218
int signal_present
>0 if a signal above the minimum is present. It may or may not be a V.17 signal.
Definition private/v17rx.h:176
int low_samples
A count of the current consecutive samples below the carrier off threshold.
Definition private/v17rx.h:180
float symbol_sync_dc_filter[2]
Definition private/v17rx.h:139
float training_error
A measure of how much mismatch there is between the real constellation, and the decoded symbol positi...
Definition private/v17rx.h:145
int eq_put_step
Current write offset into the equalizer buffer.
Definition private/v17rx.h:201
logging_state_t logging
Error and flow logging control.
Definition private/v17rx.h:238
power_meter_t power
A power meter, to measure the HPF'ed signal power in the channel.
Definition private/v17rx.h:192
uint32_t scramble_reg
The register for the data scrambler.
Definition private/v17rx.h:163
put_bit_func_t put_bit
The callback function used to put each bit received.
Definition private/v17rx.h:59
int trellis_ptr
Current pointer to the trellis buffers.
Definition private/v17rx.h:223
void * put_bit_user_data
A user specified opaque pointer passed to the put_but routine.
Definition private/v17rx.h:61
int carrier_drop_pending
Whether or not a carrier drop was detected and the signal delivery is pending.
Definition private/v17rx.h:178
uint32_t carrier_phase
The current phase of the carrier (i.e. the DDS parameter).
Definition private/v17rx.h:185
int short_train
Scrambler tap.
Definition private/v17rx.h:168
int training_count
A count of how far through the current training step we are.
Definition private/v17rx.h:172
float baud_phase
Definition private/v17rx.h:141
float distances[8]
Euclidean distances (actually the squares of the distances) from the last states of the trellis.
Definition private/v17rx.h:235
int rrc_filter_step
Current offset into the RRC pulse shaping filter buffer.
Definition private/v17rx.h:158
int32_t carrier_phase_rate
The update rate for the phase of the carrier (i.e. the DDS increment).
Definition private/v17rx.h:187
float agc_scaling_save
The previous value of agc_scaling, needed to reuse old training.
Definition private/v17rx.h:123
int diff
The current state of the differential decoder.
Definition private/v17rx.h:161
int bit_rate
The bit rate of the modem. Valid values are 7200 9600, 12000 and 14400.
Definition private/v17rx.h:57
const complexf_t * constellation
A pointer to the current constellation.
Definition private/v17rx.h:155
float carrier_track_i
The integral part of the carrier tracking filter.
Definition private/v17rx.h:150
complexf_t eq_coeff_save[17]
A saved set of adaptive equalizer coefficients for use after restarts.
Definition private/v17rx.h:130
int baud_half
The current half of the baud.
Definition private/v17rx.h:206
float carrier_track_p
The proportional part of the carrier tracking filter.
Definition private/v17rx.h:148
int16_t high_sample
A highest magnitude sample seen.
Definition private/v17rx.h:182
int past_state_locations[16][8]
The trellis.
Definition private/v17rx.h:227
float symbol_sync_high[2]
Definition private/v17rx.h:137
complexf_t eq_buf[17]
The equalizer signal buffer.
Definition private/v17rx.h:132
float rrc_filter[27]
The root raised cosine (RRC) pulse shaping filter buffer.
Definition private/v17rx.h:152
modem_status_func_t status_handler
The callback function used to report modem status changes.
Definition private/v17rx.h:64
int total_baud_timing_correction
The total symbol timing correction since the carrier came up. This is only for performance analysis p...
Definition private/v17rx.h:210
float agc_scaling
The scaling factor accessed by the AGC algorithm.
Definition private/v17rx.h:121
int eq_step
Current read offset into the equalizer buffer.
Definition private/v17rx.h:199
int32_t carrier_on_power
The power meter level at which carrier on is declared.
Definition private/v17rx.h:194
int full_path_to_past_state_locations[16][8]
The trellis.
Definition private/v17rx.h:225
void * qam_user_data
A user specified opaque pointer passed to the qam_report callback routine.
Definition private/v17rx.h:73
int eq_skip
Symbol count to the next equalizer update.
Definition private/v17rx.h:203
void * status_user_data
A user specified opaque pointer passed to the status function.
Definition private/v17rx.h:66
int16_t last_sample
The value of the last signal sample, using the a simple HPF for signal power estimation.
Definition private/v17rx.h:174
int bits_per_symbol
The number of bits in each symbol at the current bit rate.
Definition private/v17rx.h:220
int32_t angles[16]
History list of phase angles for the coarse carrier aquisition step.
Definition private/v17rx.h:215
int training_stage
The section of the training data we are currently in.
Definition private/v17rx.h:170
float eq_delta
The current delta factor for updating the equalizer coefficients.
Definition private/v17rx.h:126