v17_rx_state_t Struct Reference

#include <v17rx.h>

List of all members.

Public Attributes
int	bit_rate
	The bit rate of the modem. Valid values are 7200 9600, 12000 and 14400.
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_but routine.
modem_rx_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	rrc_filter [V17_RX_FILTER_STEPS]
	The route raised cosine (RRC) pulse shaping filter buffer.
int	rrc_filter_step
	Current offset into the RRC pulse shaping filter buffer.
int	diff
	The state of the differential decoder.
unsigned int	scramble_reg
	The register for the data scrambler.
int	short_train
	TRUE if the short training sequence is to be used.
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.
float	training_error
	A measure of how much mismatch there is between the real constellation, and the decoded symbol positions.
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.17 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.
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.
float	carrier_track_p
	The proportional part of the carrier tracking filter.
float	carrier_track_i
	The integral part of the carrier tracking filter.
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.
float	agc_scaling
	The scaling factor accessed 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 [V17_EQUALIZER_PRE_LEN+1+V17_EQUALIZER_POST_LEN]
	The adaptive equalizer coefficients.
complexf_t	eq_coeff_save [V17_EQUALIZER_PRE_LEN+1+V17_EQUALIZER_POST_LEN]
	A saved set of adaptive equalizer coefficients for use after restarts.
complexf_t	eq_buf [V17_EQUALIZER_PRE_LEN+1+V17_EQUALIZER_POST_LEN]
	The equalizer signal buffer.
float	symbol_sync_low [2]
float	symbol_sync_high [2]
float	symbol_sync_dc_filter [2]
float	baud_phase
int	total_baud_timing_correction
	The total symbol timing correction since the carrier came up. This is only for performance analysis purposes.
int32_t	start_angles [2]
	Starting phase angles for the coarse carrier aquisition step.
int32_t	angles [16]
	History list of phase angles for the coarse carrier aquisition step.
const complexf_t *	constellation
	A pointer to the current constellation.
int	space_map
	A pointer to the current space map. There is a space map for each trellis state.
int	bits_per_symbol
	The number of bits in each symbol at the current bit rate.
int	trellis_ptr
	Current pointer to the trellis buffers.
int	full_path_to_past_state_locations [V17_TRELLIS_STORAGE_DEPTH][8]
	The trellis.
int	past_state_locations [V17_TRELLIS_STORAGE_DEPTH][8]
	The trellis.
float	distances [8]
	Euclidean distances (actually the squares of the distances) from the last states of the trellis.
logging_state_t	logging
	Error and flow logging control.

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Detailed Description

V.17 modem receive side descriptor. This defines the working state for a single instance of a V.17 modem receiver.

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Member Data Documentation

float v17_rx_state_t::symbol_sync_low[2]

Low band edge filter for symbol sync.

Referenced by v17_rx(), v17_rx_restart(), v32bis_restart(), and v32bis_rx().

float v17_rx_state_t::symbol_sync_high[2]

High band edge filter for symbol sync.

Referenced by v17_rx(), v17_rx_restart(), v32bis_restart(), and v32bis_rx().

float v17_rx_state_t::symbol_sync_dc_filter[2]

DC filter for symbol sync.

Referenced by v17_rx_restart(), and v32bis_restart().

float v17_rx_state_t::baud_phase

Baud phase for symbol sync.

Referenced by v17_rx_restart(), and v32bis_restart().

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The documentation for this struct was generated from the following file:

• v17rx.h