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Digital Signal Processing

Digital signal processing (DSP) is the numerical manipulation of signals, usually with the intention to measure, filter, produce or compress continuous analog signals. It is characterized by the use of digital signals to represent these signals as discrete time, discrete frequency, or other discrete domain signals in the form of a sequence of numbers or symbols to permit the digital processing of these signals.

DSP on Wikipedia

 * Filter structures/representations
 * Recursive (IIR) filters
   * Classic biquads
 * Fourier analysis
 * fractional delay filters