# FFT / Window Explorer

> Explore how analysis windows (Hann, Hamming, Blackman, flat-top…) shape a signal's FFT spectrum: spectral leakage, ENBW, scalloping and side-lobes.

Practice: software
Status: Proto v0.1
Tag: FFT, DSP, Window, Spettro, Analisi segnale
Method, assumptions and limits: <https://www.stline.it/en/wiki/fft-window-explorer/index.md>

Page: <https://www.stline.it/en/tools/fft-window-explorer/>

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Demonstrative tool for spectral analysis. Compose a test signal (sum of sinusoids + optional noise), choose sample rate, FFT length and window, then read the time-domain signal, the FFT spectrum in dB and the window metrics (ENBW, scalloping loss, main-lobe width, side-lobe level). Illustrates the resolution/leakage trade-off.

This file is a **descriptor**, not the tool's documentation: it says what the tool computes and by what method, in summary. Formulas, assumptions, validity conditions and limits are in the wiki linked above. The tool runs in the browser at the page given.