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CBSE Class 12-science Answered

Which is more noisy FM signal or AM signal??Explain.
Asked by lovemaan5500 | 21 Feb, 2020, 10:12: PM
answered-by-expert Expert Answer
In AM signal amplitude of high frequency carrier wave is modified according to audio wave frequency
 
and this modified carrier signal is transmitted through space. In receiver Amplitude of received signal is demodulated
and audio signal is extracted . when the transmitted carrier wave is travelling through space, its amplitude is getting
distorted due to several disturbances like lightning, humid weather and other electrical noises present in atmosphere.
 
Hence transmitted AM signal is distorted in amplitude and this distortion produces noise in receiver.
 
Whereas in FM signal, frequency is modulated as per audio signal. Transmitted FM signal frequency does not undergo
any change due to electrical disturbances in space. In receiver , frequency information is extracted from signal to get audio signal.
Hence there is less noise in FM transmission
Answered by Thiyagarajan K | 22 Feb, 2020, 08:47: AM

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