Binaural Beats Generator

How to Use the Binaural Beats Generator

Create binaural beats targeting specific brainwave frequencies

1. Choose a session preset (Sleep, Relax, Focus, or Meditate) or configure custom frequencies
2. Put on headphones, adjust the volume, and press Play
3. Listen for your chosen duration — the timer counts down automatically

How Binaural Beats Work

When two pure tones at slightly different frequencies are delivered to separate ears through headphones, the brain perceives a third rhythmic pulsation — the binaural beat — at the difference between the two frequencies. For example, a 200 Hz tone in one ear and a 210 Hz tone in the other produces a perceived 10 Hz beat. This phenomenon was first described by physicist Heinrich Wilhelm Dove in 1839. The binaural beat falls within the range of human brainwave frequencies (1–30 Hz), which correspond to established EEG bands: delta (1–4 Hz, deep sleep), theta (4–8 Hz, meditation), alpha (8–13 Hz, relaxation), beta (13–30 Hz, alertness), and gamma (above 30 Hz, high-level processing). Both tones must be below 1,500 Hz with a difference no greater than 40 Hz for the effect to occur.

Methodology

Generates two sine tones at slightly different frequencies, panned fully left and right using the Web Audio API’s StereoPannerNode. The frequency difference creates a binaural beat perceived in the auditory cortex. Session presets target established brainwave frequency bands (delta, theta, alpha, beta, gamma) based on EEG classification conventions. Fade envelopes prevent audio clicks.

Understanding Your Results

Binaural beats work by playing two slightly different frequencies in each ear through stereo headphones. Your brain perceives a third 'beat' at the difference between the two frequencies. For example, 200 Hz in the left ear and 210 Hz in the right ear produces a perceived 10 Hz binaural beat. Frequency Ranges and Associated States: • Delta (0.5–4 Hz): Deep sleep, healing, and unconscious processes. Used for sleep induction and deep meditation. • Theta (4–8 Hz): Light sleep, deep relaxation, creativity, and meditation. Associated with the hypnagogic state between waking and sleeping. • Alpha (8–13 Hz): Relaxed wakefulness, calm focus, and light meditation. Often experienced during quiet rest with eyes closed. • Beta (13–30 Hz): Active thinking, concentration, and alertness. Subdivided into low beta (focused calm), mid beta (active engagement), and high beta (anxiety-prone). • Gamma (30–50 Hz): Peak concentration, cognitive processing, and problem-solving. Associated with moments of insight and high-level information processing. Base Frequency: The base (carrier) frequency determines the pitch of the tone you hear. Lower base frequencies (100–200 Hz) are generally more comfortable for extended listening. The binaural effect works with base frequencies between roughly 100 and 1000 Hz — above 1000 Hz, the brain becomes less able to detect the frequency difference between ears. Headphones Required: Binaural beats only work with stereo headphones because each ear must receive a different frequency. Speakers, mono earbuds, or bone conduction headphones will not produce the binaural effect.

Sources

• Wikipedia — Binaural Beats
• Ingendoh et al. (2023) — Binaural beats systematic review, PLOS ONE
• W3C — Web Audio API Specification

Practical Examples

Example 1 — Focus Session for Studying Settings: Beta range, 18 Hz beat frequency, 200 Hz base frequency Left ear: 200 Hz | Right ear: 218 Hz | Perceived beat: 18 Hz (low beta) Duration: 25 minutes (one Pomodoro study session) Expected effect: Mild increase in alertness and focused attention Best with: Quiet environment, comfortable over-ear headphones, no other audio Example 2 — Pre-Sleep Relaxation Settings: Theta range, 6 Hz beat frequency, 150 Hz base frequency Left ear: 150 Hz | Right ear: 156 Hz | Perceived beat: 6 Hz (theta) Background: Rain sounds at low volume Duration: 20–30 minutes before bed Expected effect: Deep relaxation, transition toward drowsiness Note: Set a timer or use the auto-stop feature — falling asleep with headphones can be uncomfortable

Usage Tips & Best Practices

• Always use stereo headphones — binaural beats require a different frequency in each ear. Over-ear headphones provide the best seal and most consistent results. In-ear buds work but may allow more ambient noise leakage. • Start with alpha (8–13 Hz) frequencies for relaxation or theta (4–8 Hz) for meditation. These ranges are the most commonly studied and reported as beneficial. Begin with 15–20 minute sessions and increase gradually as you become accustomed to the experience. • Keep the volume comfortable — binaural beats should be audible but not loud. Excessive volume does not increase effectiveness and can cause ear fatigue. A volume where you can still hear the subtle 'pulsing' of the beat is ideal. • Combine with background sounds for a more pleasant experience. Many users find pure tones monotonous. The tool's background sound options (rain, ocean, pink noise) can mask the tonal quality while preserving the binaural frequency difference. • Note that scientific evidence for binaural beats is mixed. Some peer-reviewed studies show measurable EEG changes and self-reported benefits for relaxation and focus, while others find no significant effect beyond placebo. Binaural beats are not a medical treatment and should not replace professional medical advice for sleep disorders, anxiety, or other conditions.