📈Spectrum Analyzer

About this analyzer

A real-time FFT of your microphone or an audio file while it plays — frequency bars from bass to treble on a logarithmic axis, with a live readout naming the loudest frequency. Microphone audio is analysed and discarded; nothing is recorded or sent anywhere.

Reading the picture, catching the culprits

The analyzer splits incoming sound into its component frequencies many times a second — bass left, treble right, bar height = energy. First five minutes of fun: whistle (one clean spike that slides with your pitch), sing a vowel (a spike forest — your fundamental plus harmonics), say "sss" (a wash above 5 kHz), play a song (the kick drum thumping the left edge). Then the practical work it's quietly excellent at: HUM HUNTING — a spike parked at exactly 50 or 60 Hz is mains interference (which one tells you your continent's grid), and its harmonic at 100 or 120 Hz is the classic ground-loop signature; find it here, then cut that band with the EQ. Room assessment: run it in "silence" and see what your background noise actually contains before a recording session. Speaker checks: sweep the tone generator through a speaker and watch for frequencies that vanish. The peak readout even works as a rough tuner, though the real one is next door. The time-domain picture of sound is the waveform tool's job.

Frequently asked questions