timegrapher

Praat script for wristwatch timing

To Do

• automatic pre-processing
  • determine noisy frequencies
    • make recording of background noise
    • analyse spectrum
    • determine stop Hann band frequency range
• analyse timing
  • identify pulses
    • raw pulse concretization
    • clean up spurious pulses
      • remove wrongly identified pulses
      • remove pulses at start and end of recording
    • label pulses
  • automatically identify rate (vibrations/hour)
    • seiko 7s26: 21600
    • other common rates: 14400, 18000, 28800, 36600
  • calculate rate deviation (seconds/day)
  • calculate Amplitude if lift angle is provided
    • amplitude = liftAngle / sin(2 * pi * liftTime * beatsPerHour / 7200)
    • perhaps use measured bph instead of known bph to calculate amplitude
• visualize measurements
• allow user to adjust visualization
• add mode that uses saved data
• add GUI