Signals represent information about data, voice, audio, image, video There are many ways to classify signals but here we categorize signals as either analog (continuous-time) or digital (discretetime). Signal processing is to use circuits and systems (hardware and software) to act on input signal to give output signal which differs from the input, the way we would like to. Digital systems have many advantages over analog such as noise immunity, easiness of storage and transmission To convert an analog signal to a digital equivalence we first sample it at regular intervals, quantize the samples, then code the quantized values into binary numbers. If only the sampling is.
