atsci_randomizer Class Reference

#include <atsci_randomizer.h>

List of all members.


Detailed Description

ATSC data "whitener".

The data randomizer described in ATSC standard A/53B. See figure D4 on page 54.

Public Member Functions

 atsci_randomizer ()
void reset ()
 reset randomizer LFSR
void randomize (atsc_mpeg_packet_no_sync &out, const atsc_mpeg_packet &in)
 randomize (whiten) mpeg packet and remove leading MPEG-2 sync byte
void derandomize (atsc_mpeg_packet &out, const atsc_mpeg_packet_no_sync &in)
 derandomize (de-whiten) mpeg packet and add leading MPEG-2 sync byte
unsigned int state () const

Friends

class qa_atsci_randomizer


Constructor & Destructor Documentation

atsci_randomizer::atsci_randomizer (  ) 


Member Function Documentation

void atsci_randomizer::reset (  ) 

reset randomizer LFSR

must be called during the Data Segment Sync interval prior to the first data segment. I.e., the LFSR is reset prior to the first field of each VSB data frame.

Referenced by atsc_randomizer::reset(), atsc_derandomizer::reset(), atsc_randomizer::work(), and atsc_derandomizer::work().

void atsci_randomizer::randomize ( atsc_mpeg_packet_no_sync out,
const atsc_mpeg_packet in 
)

randomize (whiten) mpeg packet and remove leading MPEG-2 sync byte

References atsc_mpeg_packet_no_sync::data, and atsc_mpeg_packet::data.

Referenced by atsc_randomizer::work().

void atsci_randomizer::derandomize ( atsc_mpeg_packet out,
const atsc_mpeg_packet_no_sync in 
)

derandomize (de-whiten) mpeg packet and add leading MPEG-2 sync byte

References atsc_mpeg_packet_no_sync::data, and atsc_mpeg_packet::data.

Referenced by atsc_derandomizer::work().

unsigned int atsci_randomizer::state (  )  const [inline]


Friends And Related Function Documentation

friend class qa_atsci_randomizer [friend]


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

Generated on Thu Mar 27 14:50:01 2008 for GNU Radio 3.1.1 by  doxygen 1.5.5