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DSP & Sampling

Nyquist · aliasing · FFT bin width · PSD units

Sampling & Aliasing

Nyquist f_s/2; a tone above it folds to an alias. Spectrum view shows where the input lands.

FFT Bin Width & Resolution

Δf=f_s/N=1/(N·T_s); bin k → k·Δf.

PSD Units & Window

Amplitude → PSD (units²/Hz); ENBW from window.

Anti-Alias Filter Check

Highest content must sit below f_s/2.
Formula reference

Nyquist: sample at > 2·f_max. Alias of f at f_s: f_alias = |f − round(f/f_s)·f_s|.

FFT bin Δf = f_s/N; bin k → f_k = k·f_s/N. PSD = A²_rms/(Δf·ENBW). Pairs with the vibration page's PSD tooling.