Nyquist frequency signal, whereas "Nyquist frequency" is a property of a discrete-time system. When the function domain is time, sample rates are usually expressed in samples per second, and the unit of Nyquist frequency is cycles per second (hertz). When the function domain is distance, as in an image sampling system, the sample rate might be dots per inch and the corresponding Nyquist frequency would be in cycles/inch. Referring again to Figure 1, undersampling of the sinusoid at 0.6 f is what allows there to be a lower-frequency "alias", which is a different function that produces the same set of samples. That
Oh, What Songs of the Heart blest, There's no word, there's no thought can impart, But our rapture will be All the soul can attest, In the heavenly songs of the heart; But our rapture will be In the vision we'll see Best expressed in the songs of the heart Oh, what songs we'll employ! Oh, what welcome we'll hear! When we kneel at our dear Savior's feet. And the heart swells with joy In embraces most dear When our heavenly parents we meet! Oh, what songs we'll employ As the heart swells with joy, When our heavenly parents we meet! </poem> "Oh, What Songs of