Introduce Often, in practice, it is convenient to map a finite-length sequence from the time domain into a finite-length sequence of the same length in a different domain and vice-versa e Such transformations are usually collectively called finite-length transformsIntroduce ⚫ Often, in practice, it is convenient to map a finite-length sequence from the time domain into a finite-length sequence of the same length in a different domain, and vice-versa. ⚫ Such transformations are usually collectively called finite-length transforms