What Is a Sine Wave?
A sine wave is the simplest sound, containing only one frequency with no harmonics. It is the building block of all sounds. A mathematical description is available on the sine wave article.
Why Use a Sine Wave for Testing?
Because it has a single frequency, any extra buzzing, rattling or fuzz you hear comes from your equipment, not the signal. That makes sine waves perfect for finding distortion, loose parts and resonances.
Quick Start
Press start, drag the slider and listen. Try 50 Hz for bass, 440 Hz for the standard tuning note and 1 kHz for clarity. Switch to square wave in the tone generator to compare.
More Audio Tools
See the online tone generator, frequency generator and speaker test.
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Frequently Asked Questions
Is a sine wave the same as a pure tone?
Yes.
Why does it sound dull?
It has no harmonics, so it sounds smooth and plain.
Can I use it to tune instruments?
Yes, 440 Hz is concert A.
Will it damage speakers?
Only at very high volume.