QUESTION 30 A baseband signal, which can either be analog or digital, is combine

Question

QUESTION 30 A baseband signal, which can either be analog or digital, is combined with a carrier wave to create a passband signal. True False QUESTION 31 A carrier is a periodic wave that can be represented by either a sine or cosine wave. Once the carrier is combined with a message (ie, information) wave the modulated carrier 0.?., modulated signal wave) will have a frequency bandwidth associated with it. True False QUESTION 32 Select the correct statements) regarding amplitude modulation (AM) o a. If the AM Index is greater than 1 (ie, kIAMPI), then over modulation occurs leading to signal distortion b. With AM, the message is captured as amplitude changes to the carriers amplitude C.The AM modulated signal bandwidth is dependent upon the highest frequency of the message (fm d. All of the above are correct

Explanation / Answer

q.30

TRUE

Baseband signal is of low frequency. But to transmit a low frequency signal we require large size antenna hence we shift frequency to high by adding a carrier wave of high frequency which results in passband signal(in general).

Passband signal is of high frequency which is physically transmitted but the original signal is baseband signal.

31.

TRUE

After modulating the signal with carrier wave of high frequency we get a modulated signal with an associated frequency bandwidth which can be calculated.

32. ALL ARE TRUE

a. Modulation index is the ratio of modulation amplitude and carrier amplitude if this value exceeds 1 it is said to be overmodulated and signal distortion occurs.

b.amplitude of message changes linearly with that of carrier wave.

c.In Radio transmission the amplitude of modulated signal is twice of message signal.

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