atsci_sssr Class Reference

#include <atsci_sssr.h>

Collaboration diagram for atsci_sssr:

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List of all members.


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.

Public Member Functions

 atsci_sssr ()
 ~atsci_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)


Constructor & Destructor Documentation

atsci_sssr::atsci_sssr (  ) 

References _SSSR_DIAG_OUTPUT_, and reset().

atsci_sssr::~atsci_sssr (  ) 


Member Function Documentation

void atsci_sssr::reset (  ) 

void atsci_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.

References _SSSR_DIAG_OUTPUT_, sssr::seg_sync_integrator::find_max(), gr_signbit(), sssr::seg_sync_integrator::update(), sssr::digital_correlator::update(), and sssr::quad_filter::update().

Referenced by atsc_bit_timing_loop::work().


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

Generated on Thu Mar 27 15:00:18 2008 for GNU Radio 3.1.1 by  doxygen 1.5.5