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Audio beat frequency
Compare two steady pure-tone frequencies for tuning and interference checks.
First frequency (Hz): 20–20000; Second frequency (Hz): 20–20000
Inputs stay on this page and clear on refresh.
Audio beat frequency
First frequency (Hz): 440 Second frequency (Hz): 442
- Beat frequency (Hz)
- 2.000000
- Arithmetic mean frequency (Hz)
- 441.000000
Beat frequency = |f₂ − f₁|; arithmetic mean = (f₁ + f₂)/2. Frequencies are in hertz. Equal frequencies give zero beats; swapping inputs changes neither result. For close, steady pure tones, the difference describes the rate of loudness beating. The mean is an arithmetic reference, not a newly generated spectral component or a guaranteed perceived pitch. The calculation does not predict audibility, modulation depth, phase, level, real-instrument harmonics, drift, room interference or Doppler effects. No sound is played. Display rounds to six decimals; calculations retain precision.
Methodology
How it works
Beat frequency = |f₂ − f₁|; arithmetic mean = (f₁ + f₂)/2. Frequencies are in hertz. Equal frequencies give zero beats; swapping inputs changes neither result. For close, steady pure tones, the difference describes the rate of loudness beating. The mean is an arithmetic reference, not a newly generated spectral component or a guaranteed perceived pitch. The calculation does not predict audibility, modulation depth, phase, level, real-instrument harmonics, drift, room interference or Doppler effects. No sound is played. Display rounds to six decimals; calculations retain precision.
Method and assumptions documented by Techrider.live
2026-10-26
Frequently asked questions
Do identical frequencies guarantee silence?
No. They give zero beat rate, but the combined level depends on relative phase and amplitude. 440 Hz and 442 Hz give a 2 Hz beat rate and 441 Hz arithmetic mean; large differences need not sound like separate audible pulses.