Question: A DSB-SC modulated signal is demodulated by applying it to a coherent detector. (a) Evaluate the effect of a frequency error in the local

A DSB-SC modulated signal is demodulated by applying it to a coherent detector.

(a) Evaluate the effect of a frequency error Δƒ in the local carrier frequency of the detector, measured with respect to the carrier frequency of the incoming DSB-SC signal.

(b) For the case of a sinusoidal modulating wave show that because of this frequency error, the demodulated signal exhibits beat at the error frequency. Illustrate your answer with a sketch of this demodulated signal.

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