| spandsp 0.0.6
    | 
#include <v27ter_rx.h>
| Public Attributes | |
| int | bit_rate | 
| The bit rate of the modem. Valid values are 2400 and 4800. | |
| put_bit_func_t | put_bit | 
| The callback function used to put each bit received. | |
| void * | put_bit_user_data | 
| A user specified opaque pointer passed to the put_bit routine. | |
| modem_status_func_t | status_handler | 
| The callback function used to report modem status changes. | |
| void * | status_user_data | 
| A user specified opaque pointer passed to the status function. | |
| qam_report_handler_t | qam_report | 
| A callback function which may be enabled to report every symbol's constellation position. | |
| void * | qam_user_data | 
| A user specified opaque pointer passed to the qam_report callback routine. | |
| float | agc_scaling | 
| The scaling factor assessed by the AGC algorithm. | |
| float | agc_scaling_save | 
| The previous value of agc_scaling, needed to reuse old training. | |
| float | eq_delta | 
| The current delta factor for updating the equalizer coefficients. | |
| complexf_t | eq_coeff [32] | 
| The adaptive equalizer coefficients. | |
| complexf_t | eq_coeff_save [32] | 
| A saved set of adaptive equalizer coefficients for use after restarts. | |
| complexf_t | eq_buf [32] | 
| The equalizer signal buffer. | |
| float | training_error | 
| A measure of how much mismatch there is between the real constellation, and the decoded symbol positions. | |
| float | carrier_track_p | 
| The proportional part of the carrier tracking filter. | |
| float | carrier_track_i | 
| The integral part of the carrier tracking filter. | |
| float | rrc_filter [27] | 
| The root raised cosine (RRC) pulse shaping filter buffer. | |
| int | rrc_filter_step | 
| Current offset into the RRC pulse shaping filter buffer. | |
| uint32_t | scramble_reg | 
| The register for the training and data scrambler. | |
| int | scrambler_pattern_count | 
| A counter for the number of consecutive bits of repeating pattern through the scrambler. | |
| int | training_bc | 
| The current step in the table of BC constellation positions. | |
| int | old_train | 
| TRUE if the previous trained values are to be reused. | |
| int | training_stage | 
| The section of the training data we are currently in. | |
| int | training_count | 
| A count of how far through the current training step we are. | |
| int16_t | last_sample | 
| The value of the last signal sample, using the a simple HPF for signal power estimation. | |
| int | signal_present | 
| >0 if a signal above the minimum is present. It may or may not be a V.27ter signal. | |
| int | carrier_drop_pending | 
| Whether or not a carrier drop was detected and the signal delivery is pending. | |
| int | low_samples | 
| A count of the current consecutive samples below the carrier off threshold. | |
| int16_t | high_sample | 
| A highest magnitude sample seen. | |
| int | constellation_state | 
| The position of the current symbol in the constellation, used for differential decoding. | |
| uint32_t | carrier_phase | 
| The current phase of the carrier (i.e. the DDS parameter). | |
| int32_t | carrier_phase_rate | 
| The update rate for the phase of the carrier (i.e. the DDS increment). | |
| int32_t | carrier_phase_rate_save | 
| The carrier update rate saved for reuse when using short training. | |
| power_meter_t | power | 
| A power meter, to measure the HPF'ed signal power in the channel. | |
| int32_t | carrier_on_power | 
| The power meter level at which carrier on is declared. | |
| int32_t | carrier_off_power | 
| The power meter level at which carrier off is declared. | |
| int | eq_step | 
| Current read offset into the equalizer buffer. | |
| int | eq_put_step | 
| Current write offset into the equalizer buffer. | |
| int | eq_skip | 
| Symbol counter to the next equalizer update. | |
| int | baud_half | 
| The current half of the baud. | |
| int | gardner_integrate | 
| Integration variable for damping the Gardner algorithm tests. | |
| int | gardner_step | 
| Current step size of Gardner algorithm integration. | |
| int | total_baud_timing_correction | 
| The total symbol timing correction since the carrier came up. This is only for performance analysis purposes. | |
| int32_t | last_angles [2] | 
| The previous symbol phase angles for the coarse carrier aquisition step. | |
| int32_t | diff_angles [16] | 
| History list of phase angle differences for the coarse carrier aquisition step. | |
| logging_state_t | logging | 
| Error and flow logging control. | |
V.27ter modem receive side descriptor. This defines the working state for a single instance of a V.27ter modem receiver.