to Hubert: taky jsem "zagoogloval" a první link vypadá takto:

"The Nyquist Theorem, also known as the sampling theorem, is a principle that engineers follow in the digitization of analog signals. For analog-to-digital conversion (ADC) to result in a faithful reproduction of the signal, slices, called samples, of the analog waveform must be taken frequently. The number of samples per second is called the sampling rate or sampling frequency."

celý problém je v tom že ti z názvu vypadl pojem "stabilita".
ale jistý jsem si názvy nebyl tak, katedry už jsem opustit už před léty
:-))