diff options
Diffstat (limited to 'gr-atsc/README.signal_flow')
| -rw-r--r-- | gr-atsc/README.signal_flow | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/gr-atsc/README.signal_flow b/gr-atsc/README.signal_flow new file mode 100644 index 000000000..879cb2c42 --- /dev/null +++ b/gr-atsc/README.signal_flow @@ -0,0 +1,41 @@ +This describes the signal flow through the gnuradio-0.9 ATSC Transmitter +and Receiver programs. + +ATSC Transmitter +================ + +module input output notes +-------------------- ---------------- ------------------- -------- +VrFileSource "MPEG transport stream" atsc_mpeg_packet +GrAtscRandomizer atsc_mpeg_packet atsc_mpeg_packet_no_sync whiten data with LFSR +GrAtscRSEncoder atsc_mpeg_packet_no_sync atsc_mpeg_packet_rs_encoded Reed-Soloman encoder +GrAtscInterleaver atsc_mpeg_packet_rs_encoded atsc_mpeg_packet_rs_encoded convolutional interleaver +GrAtscTrellisEncoder atsc_mpeg_packet_rs_encoded atsc_data_segment trellis encoder +GrAtscFieldSyncMux atsc_data_segment atsc_data_segment add in field syncs +GrAtscSymbolMapper atsc_data_segment float map [0,7] to +/- {1,3,5,7} and add pilot +GrWeaverModHead float float,float front half of Weaver VSB modulator +GrFIRfilterFFF (2x) float float low pass root raised cosine (matched filter) +GrWeaverModTail float,float short back half of Weaver VSB modulator +VrFileSink short "16-bit passband data" + + +ATSC Receiver +============= + +module input output notes +-------------------- ---------------- ------------------- ------- +VrFileSource "16-bit passband data" short +GrConvertSF short float convert short to float +GrFIRfilterFFF float float band pass root raised cosine centered at IF freq (matched filter) +GrAtscFPLL float float carrier tracking freq and phase lock loop with down converting mixer +GrFIRfilterFFF float float low pass to kill unwanted mixer image +GrRemoveDcFFF float float remove DC offset prior to symbol timing module +GrAtscBitTimingLoop3 float float,syminfo track symbol & segment timing and do fractional interpolation +GrAtscFieldSyncChecker float,syminfo float,syminfo look for field sync patterns +GrAtscEqualizer float,syminfo float,syminfo LMS equalizer +GrAtscFieldSyncDemux float,syminfo atsc_soft_data_segment remove field syncs and pack into data segments +GrAtscViterbiDecoder atsc_soft_data_segment atsc_mpeg_packet_rs_encoded Viterbi decoder (12 seg delay) +GrAtscDeinterleaver atsc_mpeg_packet_rs_encoded atsc_mpeg_packet_rs_encoded convolutional de-interleaver (52 seg delay) +GrAtscRSDecoder atsc_mpeg_packet_rs_encoded atsc_mpeg_packet_no_sync Reed-Solomon decoder +GrAtscDerandomizer atsc_mpeg_packet_no_sync atsc_mpeg_packet de-whiten with LFSR +VrFileSink atsc_mpeg_packet "MPEG transport stream" |