🎵 Beat Frequency Calculator
Input two frequencies to calculate beat frequency, visualize interference patterns, and learn about binaural beats.
Understanding Beat Frequency
When two sound waves with slightly different frequencies overlap, they create an interference pattern that produces a pulsing sound called "beats." The beat frequency equals the absolute difference between the two frequencies.
Formula
fbeat = |f₁ − f₂|
For example, 440 Hz and 444 Hz produce a beat frequency of 4 Hz — you'll hear 4 pulses per second.
What Are Binaural Beats?
Binaural beats are an auditory illusion that occurs when you listen to two slightly different frequencies through headphones (one in each ear). Your brain perceives a third tone at the difference frequency:
- Delta (0.5–4 Hz): Deep sleep, healing
- Theta (4–8 Hz): Meditation, creativity, relaxation
- Alpha (8–14 Hz): Relaxed focus, stress reduction
- Beta (14–30 Hz): Active thinking, concentration
- Gamma (30–50 Hz): Higher cognition, processing
Frequently Asked Questions
Why can't I hear very low beat frequencies?
Very low beat frequencies (below 1 Hz) produce a slow pulsing that may be hard to perceive consciously. They may still have an effect through binaural beat mechanisms when using headphones.
Is this the same as binaural beats?
The mathematical principle is the same, but true binaural beats require headphones with each frequency sent to a different ear. This tool mixes both frequencies through both speakers for demonstration.
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