Discrete Fourier Transform: Designates a Fourier transform of a time-discrete periodic signal. The periodic Signal described as a superposition of a fundamental level (direct component), a fundamental and its harmonics in a one-to-one, ie reversible manner.
Since the amplitudes and phases of the individual oscillations can now be specifically analyzed or manipulated, the DFT is an important tool in the theory and practice of digital signal processing. There are also fast algorithms for performing the transformation and its inverse. The DFT has many tasks in signal processing, e.g. B. the determination of the frequencies occurring in individually sampled signals or to determine the individual amplitudes of these frequencies.