Beat Frequency

Beats produced by two close frequencies

f_beat = |440 − 444| Hz · T = 1 / f_beat
Beat frequency
4 Hz
Beat period
0.25 s
Average (carrier) frequency
442 Hz
Beat FrequencyTwo tones at 440 Hz and 444 Hz superpose into a 442 Hz carrier whose amplitude swells and fades 4 times per second; the dashed envelope marks one beat every 0.25 seconds.t →envelopecarrier1 beat = 0.25 s