atsc_sssr Class Reference

ATSC Segment and Symbol Sync Recovery. More...

#include <atsc_sssr.h>

List of all members.

Public Member Functions
	atsc_sssr ()
	~atsc_sssr ()
void	reset ()
	call on channel change
void	update (sssr::sample_t sample_in, bool *seg_locked, int *symbol_index, double *timing_adjust)
	process a single sample at the ATSC symbol rate (~10.76 MSPS)
Private Member Functions
bool	incr_counter ()
void	incr_symbol_index ()
Private Attributes
sssr::digital_correlator	d_correlator
sssr::seg_sync_integrator	d_integrator
sssr::quad_filter	d_quad_filter
double	d_quad_output [ATSC_DATA_SEGMENT_LENGTH]
double	d_timing_adjust
int	d_counter
int	d_symbol_index
bool	d_seg_locked
FILE *	d_debug_fp

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Detailed Description

ATSC Segment and Symbol Sync Recovery.

This class implements data segment sync tracking and symbol timing using the method described in "ATSC/VSB Tutorial - Receiver Technology" by Wayne E. Bretl of Zenith, pgs 41-45.

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Constructor & Destructor Documentation

atsc_sssr::atsc_sssr (   )

atsc_sssr::~atsc_sssr (   )

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Member Function Documentation

bool atsc_sssr::incr_counter (   )  [inline, private]

void atsc_sssr::incr_symbol_index (   )  [inline, private]

void atsc_sssr::reset (   )

call on channel change

void atsc_sssr::update (  sssr::sample_t  sample_in, bool *  seg_locked, int *  symbol_index, double *  timing_adjust )

process a single sample at the ATSC symbol rate (~10.76 MSPS) This block computes an indication of our timing error and keeps track of where the segment sync's occur. timing_adjust is returned to indicate how the interpolator timing needs to be adjusted to track the transmitter's symbol timing. If seg_locked is true, then symbol_index is the index of this sample in the current segment. The symbols are numbered from 0 to 831, where symbols 0, 1, 2 and 3 correspond to the data segment sync pattern, nominally +5, -5, -5, +5.

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Member Data Documentation

sssr::digital_correlator atsc_sssr::d_correlator [private]

int atsc_sssr::d_counter [private]

FILE* atsc_sssr::d_debug_fp [private]

sssr::seg_sync_integrator atsc_sssr::d_integrator [private]

sssr::quad_filter atsc_sssr::d_quad_filter [private]

double atsc_sssr::d_quad_output[ATSC_DATA_SEGMENT_LENGTH] [private]

bool atsc_sssr::d_seg_locked [private]

int atsc_sssr::d_symbol_index [private]

double atsc_sssr::d_timing_adjust [private]

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The documentation for this class was generated from the following files:

• atsc_sssr.h
• atsc_sssr.cc

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