Analog Modulation - Definition and Types

Analog communication indicates:

a.) Continuous signal with varying amplitude or phase
b.) No numerical coding
c.) AM or FM signal
d.) All of the above

Correct Answer: d.) All of the above

Explanation:

Analog communication means that the information is transmitted in the form of a continuous signal, such as a sound wave. The signal has varying amplitude or phase or frequency.

Coding is not applied to the signal as in case of digital data. Amplitude modulated signal and frequency modulated signals are the examples of analog communication.

Types of analog modulation are:

a.) Phase modulation
b.) Frequency modulation
c.) Amplitude modulation
d.) All of the above

Correct Answer : d.) All of the above

Explanation:

Modulation is a process by which some characteristics of signal such as amplitude or phase or frequency are varied in accordance with the instantaneous value of the information signal .

The signal whose characteristics are varied is known as carrier signal, as it carries the information. The signal that carries the information is known as modulating signal as according to it, the characteristics of carrier signal are varied.

Methods of analog modulations are

1) Amplitude modulation
2) Frequency modulation
3) Phase modulation