Define : (i) Fidelity (ii) Selectivity

Define : (i) Fidelity (ii) Selectivity
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(i) Fidelity:-It is defined as the ability of an audio amplifier to reproduce all the sound frequencies faithfully i.e. amplify all of them equally. 

(ii) Selectivity:-It is defined as the ability of human ear to select sound signals of particular frequencies over those of some other frequencies of same intensity.
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