Spectrum Analyzer

idle · no source

Idle

No signal

Press Run to start. The signal generator needs no permissions — pick it in Settings if you'd rather not use the microphone, or drop an audio file anywhere on this panel.

Peak

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Note

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Level

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Δ Freq

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Δ Level

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Settings

Source

Raw capture — echo cancellation, noise suppression, and auto gain are all disabled so the spectrum reflects what the microphone actually hears.

Waveform

Frequency440 Hz

Monitor volume15%

The generator drives the analyzer and your speakers together, so you can hear exactly what you're measuring. Square and sawtooth show a clear harmonic stack; the sweep paints a diagonal across the waterfall.

No file loaded

Monitor volume70%

Decoded in the browser; nothing is uploaded. You can also drop a file straight onto the display.

Analysis

FFT size—

Larger sizes resolve closely spaced tones but respond more slowly to change.

Averaging0.72

Weighting

A–weighting discounts the low and very high ends the way human hearing does.

Display

Frequency axis

Band

Level range

Tap the display to place a marker; place two and the analyzer dimensions the span between them.

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