RAW DATA

  Got from Arthur Venancio the "lightly grilled" files, with one line for each sampling frame:

    "EEG_raw.csv" with 19 raw scalp electrode channel samples per line, comma-separated.
    
    "lightsensor_raw.txt" with one screen brightness sensor (SBS) sample per line. 
    
  The sampling frequency was 500 Hz (samples per second). Both files had 1466500 frames
  (2933 seconds exactly).
  
SBS CLEANUP
 
  The SBS file was rather dirty and unnecessarily complicated (with blinking used
  to indicate the SETUP intervals).  It was cleaned with 
  
    ( cat lightsensor_raw.txt | ../../cleanup_light_sensor.gawk > lightsensor_cooked.txt ) 2> lightsensor_segs.txt
    
  The summary of the segments is (frame indices starting at 1):
  
         1 ..    73711 :    73711 frames : SETUP
     73712 ..   594312 :   520601 frames : PHASE 0 (DBS off)
    594313 ..   805276 :   210964 frames : SETUP
    805277 ..  1325877 :   520601 frames : PHASE 1 (DBS on)
   1325878 ..  1466500 :   140623 frames : SETUP
   
CREATING A SYNTHETIC TEST CHANNEL

  Creating a syntetic electrode signal for each PHASE, to monitor the effect of filters.
  
    nmeeg_make_test_signal.gawk -v nt=520601 -v fsmp=500 > synth_dbs0.txt
    nmeeg_make_test_signal.gawk -v nt=520601 -v fsmp=500 > synth_dbs1.txt
    
  Adding fake SETUP segments:
  
    ( \
      ( yes '0.0' | head -n 73711 ) ; \
      ( egrep -e '^[ ]*[-+]?[0-9.]' synth_dbs0.txt ) ; \
      ( yes '0.0' | head -n 210964 ) ; \
      ( egrep -e '^[ ]*[-+]?[0-9.]' synth_dbs1.txt ) ; \
      ( yes '0.0' | head -n 140623 ) ; \
    ) > synth.txt
    wc -l synth.txt

JOINING THE FILES

  Joining the files together:
  
     paste -d ' ' EEG_raw.csv synth.txt lightsensor_cooked.txt | tr ',' ' ' > EEG_with_synth_sbs.txt

     ( cat EEG_with_synth_sbs.txt | ../../check_pasted_EEG.gawk > EEG_cooked.txt ) 2> channel_summary.txt.
     
     head EEG_cooked.txt
     tail EEG_cooked.txt
     wc -l EEG_cooked.txt
     
FILTERING AND SPLITTING

  Filtering and spliting:
  
    nmeeg_split_e19_av2020 \
        -padFrames 500 \
        -outDir . \
      < EEG_cooked.txt