Real-time spectrum analyzer
Live log-frequency spectrum from your microphone with peak hold and peak frequency readout.
Audio is analysed locally in your browser and never uploaded or played back.
Levels are in dBFS, calibrated so that a steady sine reads its own level (a full-scale sine reads 0 dBFS); they are not sound pressure levels. The 1/3-octave display sums the power in each band, as a real-time analyzer does, so pink noise appears flat and is the right signal for checking a room or PA. The FFT display shows the level per 5.9 Hz bin (8192-point FFT) with a slowly falling peak hold; there pink noise slopes down by 3 dB per octave, which is expected. The lowest bands contain only a few bins and are approximate.
How it works
A real-time analyzer shows how sound energy is spread across frequency. Use it to find feedback frequencies, compare tonal balance, or check a room response with pink noise.
Browser microphones are not measurement-grade: phone and laptop mics roll off at low frequencies and are not calibrated. Use the analyzer for relative comparison.
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