What is amplitude modulation?

Q.  In an Amplitude Modulation
- Published on 13 Oct 15

a. Amplitude of the carrier varies
b. Frequency of the carrier remains constant
c. Phase of the carrier remains constant
d. All of the above

ANSWER: All of the above
 
In an Amplitude Modulation, the amplitude of the carrier varies according to the instantaneous values of the baseband signal. The frequency and the phase of the carrier remain constant.

The envelope of the AM wave has the same shape as the message of the base band signal.

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