Question

Q# 1. Which characteristics of an analog signal are changed to represent the low pass analog signal in each of the following analog-to-analog conversions? a. AM b. FM c. PM

Answer 1

Answer:

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Explanation:

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The receiving device is tuned to the frequency of the carrier signal that it expects from the sender. Digital information then changes the carrier signal by modify- ing one or more of its characteristics (amplitude, frequency, or phase). This kind of modification is called modulation (shift keying).

Answer 2

Answer:

Option a. AM is the correct answer.

Explanation:

Analog signals are continuous signals whose time-varying properties are the depiction of other time-varying quantities i.e, Similar to another time-varying signal.

Analog-to-analog conversion –

Analog-to-analog modulation is the depiction of analog information by an analog signal. This is the process of changing the carrier wave characteristics according to the instantaneous amplitude of the modulating signal.

         This modulation is usually required when a bandpass channel is desired. A bandpass is a range of frequencies passed through a bandpass filter, which is a filter that passes certain frequencies and blocks signals at unwanted frequencies.

Analog-to-analog modulation can be done in three ways as follows-

• Amplitude modulation:- Modulation in which the amplitude of the carrier wave is varied according to the instant amplitude of the modulating signal while keeping the phase and frequency constant.
• Frequency modulation - Modulation that changes the frequency of the carrier wave according to the instant amplitude of the modulating signal while keeping the phase and amplitude constant.
• Phase modulation:- Modulation that changes the phase of the carrier wave according to the instant amplitude of the modulating signal, while keeping the amplitude and frequency stable.

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