Compute the beat frequency produced by two close tones: f_beat = |f₁ − f₂|.
两个相近频率叠加产生拍,拍频为二者之差。
| Item | Formula / Note | Source / Standard |
|---|---|---|
| Beat frequency | f_beat = |f1 − f2|, amplitude-fluctuation rate of two close tones | Superposition principle (Rayleigh, Theory of Sound) |