5.3 Effect of Sampling in the Frequency Domain The condition r>2 is often referred to as the Nyquist condition The frequency /2 is usually referred to as the folding frequency§5.3 Effect of Sampling in the Frequency Domain • The condition ΩT ≥ 2 Ωm is often referred to as the Nyquist condition • The frequency ΩT/2 is usually referred to as the folding frequency