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Diffstat (limited to 'gr-atsc/python/README')
| -rw-r--r-- | gr-atsc/python/README | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/gr-atsc/python/README b/gr-atsc/python/README new file mode 100644 index 0000000000..74d6ba134c --- /dev/null +++ b/gr-atsc/python/README @@ -0,0 +1,34 @@ +Decoding ATSC using 19.2MSps rate over 5 processes +-------------------------------------------------- + +1) Verify signal, adjust antenna and find best gain setting using uhd_fft.py, +station frequency from the fcc video database, and sample rate to 6.4e6. + +2) Capture data - adjust gain (-g) frequency (-f) and which side +the tvrx is on to fit your local setup: + +uhd_rx_cfile.py -s --samp-rate=6.4e6 -g 65 -f 503e6 atsc_data_6-4m_complex + +You probably still need fast disks to take the data, like a raid-0 set of +striped sata drives. Make sure there are no or very few Ou overruns. Saving +the raw usrp data in 'short' form halves the disk space/bus bandwidth that +the usual complex form uses. + +3) Make pipes: + +mkfifo /tmp/atsc_pipe_1 +mkfifo /tmp/atsc_pipe_2 +mkfifo /tmp/atsc_pipe_3 +mkfifo /tmp/atsc_pipe_4 +mkfifo /tmp/atsc_pipe_5 + +4) In seperate windows run processes: + +./interp_short.py <input rf data at 6.4Msps> +./xlate.py +./fpll.py +./btl-fsd.py +./viterbi-out.py <output mpeg transport stream> + + + |