ABSTRACT
Signal processing is a broader field than it may seem prima facie. Essentially, it is related to the notion of using a specially designed system (which will be termed filter) to mold an input signal to an output signal possessing some sort of desirable quality. Classically, one thinks of a filter either as an analog device built from resistors, capacitors, and inductors or, perhaps, a software-defined structure running on a digital computer, but this is not mandatory: a filter can be understood in terms of coding theory or may obey the rather intangible structure of a statistical classification machine. In Figure 17.1, we present a signal processing task in a very general form.
Figure 17.1 Scheme of a general signal processing task.
