Hi, I'm continuing to analyse the attack:
https://github.com/titola/neuropa Infrasound and signal received at 422.733 MHz: https://github.com/titola/neuropa/blob/master/media/infrasound.jpg The output of the first differentiator can be obtained by integrating the recorded sound: sum = 0 k = 1 / 80.5 m = k / 10.35 "m" is the normalization constant to get an unitary gain. For each sample "input": sum = sum + input + k output = m * sum The integration of the previous result reveals the initial pulses: sum = 0 k = -0.05 m = k / -164.11 For each sample "input": sum = sum + input + k output = m * sum Source code for Snd editor: https://github.com/titola/neuropa/blob/master/src/infrasound.scm A recent nightly recording with infrasounds: https://github.com/titola/neuropa/blob/master/media/night_20190516_a.wav My window with a dry circle (May 16 2019 nigth): https://github.com/titola/neuropa/blob/master/media/circle_window.jpg I'm investigate about the relation between the frequencies around 13 or 14 Hz and the signals synchronized with the voices at frequencies 173.456 MHz, 173.880 MHz, 173.956 MHz (the signal at 460.557 MHz is near 422.733 MHz): 422.733 ---> 1 / 0.18 = 5.55 Hz 422.733 / 173.456 = 2.437 ---> 2.437 / 0.18 = 13.54 Hz 422.733 / 460.557 = 0.918 ---> 0.918 / 0.18 = 5.1 Hz The document also contains informations about a radar with side effects. Tito Latini _______________________________________________ dupswapdrop: music-dsp mailing list music-dsp@music.columbia.edu https://lists.columbia.edu/mailman/listinfo/music-dsp
