own experiment Sweep the frequency and measures the audio response amplitude (in arbitrary unit). Can be used to look for an audio resonance (Helmholtz resonnator or a tube). Determines the resonance frequency simply by the signal maximum (will not work for multiple resonances). RES yellow all_freq all_amp index first_run freq start_f add_f audio_in audio_out_amp audio_out_freq audio_out_duration audio_squared sum max_ind res_freq

freq sum res_freq all_freq all_amp

start_f

add_f

index 1

index

index 3 0

first_run

index 2503 1

first_run

first_run 0 freq

all_freq

freq add_f

freq

first_run 1 start_f

freq

freq 20000 20000

freq

audio_in 2

audio_squared

audio_squared

sum

sum 0.5

sum

first_run 0 sum

all_amp

all_amp

max_ind

max_ind 1 all_freq

res_freq

all_freq all_amp