Analog signal processing

Write down in brief regarding the term Analog signal processing.

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Analog signal processing is for signals which have not been digitized, as in the classical radio, telephone, radar and television systems. This includes linear electronic circuits like passive filters, active filters, integrators, additive mixers and delay lines. It as well includes non-linear circuits like compandors, multiplicators (that is, frequency mixers and voltage-controlled amplifiers), voltage controlled filters, voltage controlled oscillators and phase locked loops.

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