Question

In TV broadcasting the picture and sound are transmitted simultaneously. In this:
(A) Audio signal is amplitude modulated.
(B) Audio signal is frequency modulated.
(C) Video signal is amplitude modulated.
(D) Video signal is frequency modulated.

Answer 1

In this question, the concept of the modulation needs to be understood that is modulation is the process in which the message is transferred to the receiver’s television. In the TV broadcasting, video and sound are transmitted through analog signals onto the radio carrier wave.

Complete step by step answer:
As we know that the amplitude modulation is the first type of modulation to be used to broadcast sound. Now, we discuss modulation, the process of converting sideband or data into the radio waves by adding information to an electronic signal or optical carrier signal.
To understand how the signals are transferred, let us consider the figure.
In the given figure, we can see video and sound are transmitted through analog signal onto the radio carrier wave.

As we know, the modulation is used to generate the modulated signal to characteristics of a transmission channel. This means that the transfer of messages onto the available high frequency radio channel. So, the audio of the television depends upon, the frequency modulated audio signal and the video audio of the television depends upon, the amplitude modulated signals.

Therefore, options (B) and (C) are correct. That means, the audio signal is frequency modulated and the video signal is amplitude modulated.

Note: The television is a three-part invention, a picture is shown by the television camera and sound is converted into the signal, and the transmitter sends the signals through the air to the receiver and television that are used in our homes use the transmitted signals. After that the signals turn back into the picture and the sound that is coming from the television camera.