Question

The process of superimposing audio or video messages on r.f. carrier waves is called modulation.

• A. True
• B. False

Answer 1

The correct option is A True

The frequency of a Radio frequency channel can be explained best as the frequency of a carrier wave .A carrier wave is pee rely made up of constant frequency ,bit similar to sine wave . It doesn't carry much information.

To involve data information ,another wave has to be imposed known as input signal above the carrier wave .This process of imposing an input signal on carrier wave is known as modulation . It is similar to hiding a code in the carrier wave .

Demodulation is defined as extracting original information carrying signal from a modulation carrier wave .

Application = AM is used in shortwave and radio wave broadcasting ; FM is mostly used in high -frequency radio broad cashing