Acoustic Resonance Other Description. AR1 all_times all_index all_freq all_amp index temp now freq start_f add_f mult_f length tfull t phase audio_in audio_out audio_squared sum now index all_index now 1 freq all_freq freq add_f freq freq mult_f freq freq 0 start_f freq freq 20000 20000 freq freq 20 20 freq 0.0000208333 1 tfull 1000 freq length tfull length t freq t 6.283185307 phase phase audio_out audio_in 2 audio_squared audio_squared sum now 1 sum all_amp index 1 index freq sum all_freq all_amp start_f add_f mult_f all_freq all_amp