Sampling and aliasing: the fold of every frequency

Set a tone and a sample rate: the tone folds back into 0 .. fs/2 like paper, and below, its samples fit a lower tone exactly.

This page sets no cookie and sends nothing anywhere.

Where the numbers come from

gHashTag/t27 specs/fpga/dsp/signals.t27 (t27#8985): every value on the page is its fn bodies, compiled to wasm (logic.js)
H. Nyquist, Certain topics in telegraph transmission theory, Trans. AIEE 47, 1928; C. E. Shannon, Communication in the presence of noise, Proc. IRE 37, 1949