Linear filtering
Digital signal processing — Deterministic signals

Whether it's to carry out useful processing (selecting a frequency band, extracting a signal from noise, etc.) or to model deformations, such as propagation through a channel, we are led to consider transformations on signals that can, in very general terms, be associated with a system referred to as a "black box" having an input and an output (figure 16 ). In the case of digital signals, a black box is generally taken to mean a program which, starting from the input signal $\left\{x_n\right\}$ , generates the output signal $\left\{y_n\right\}$...