<P> Analog signal processing is for signals that have not been digitized, as in legacy radio, telephone, radar, and television systems . This involves linear electronic circuits as well as non-linear ones . The former are, for instance, passive filters, active filters, additive mixers, integrators and delay lines . Non-linear circuits include compandors, multiplicators (frequency mixers and voltage - controlled amplifiers), voltage - controlled filters, voltage - controlled oscillators and phase - locked loops . </P> <P> Continuous - time signal processing is for signals that vary with the change of continuous domain (without considering some individual interrupted points). </P> <P> The methods of signal processing include time domain, frequency domain, and complex frequency domain . This technology mainly discusses the modeling of linear time - invariant continuous system, integral of the system's zero - state response, setting up system function and the continuous time filtering of deterministic signals </P> <P> Discrete - time signal processing is for sampled signals, defined only at discrete points in time, and as such are quantized in time, but not in magnitude . </P>

What is the main advantage of the signal analysis in time domain