Tone generator
Choose a tone, a sweep or noise, then press Play. Start quiet and turn it up slowly.
What is playing
440 Hz
Technical details
- frequency
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- nearest note
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- period
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- wavelength
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- sweep rate
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- waveform
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- level
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- channels
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- sample rate
- starts with the sound
Sound comes from your browser's Web Audio engine: an oscillator for tones and sweeps, and eight seconds of generated noise on a loop. Every start, stop and change glides over about 30 milliseconds, so nothing clicks. "Evenly by ear" is a logarithmic sweep and "evenly by Hz" a linear one. Pink noise is white noise filtered to fall by 3 dB each octave, so every octave carries the same power. Level is in dB below full scale, peak for waves and average for noise; the volume slider is squared, which is closer to how loudness is heard. Square and saw waves are played at half and 60% level. Wavelength is in air at 20 °C. The settings live after the # in the address, which a browser never sends anywhere.