Discussion
The characteristic of a radio receiver associated with true reproduction of audio signal is :
Answer: D
The characteristic is fidelity.
Fidelity is a receiver's ability to reproduce faithfully all the modulating frequencies of the original audio signal, without distortion. It depends on the frequency response of the IF and audio stages; good fidelity needs a flat response across the audio band, for example 50 Hz to 10 kHz for AM broadcast.
Sensitivity is the ability to pick up weak signals and give a usable output. Selectivity is the ability to separate the wanted station from adjacent ones. Image rejection is a superheterodyne receiver's ability to reject the image frequency. None of these is about faithful reproduction of the audio.
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