Question

In a video signal for transmission of the picture, what value of bandwidth is used in the communication system?
A. \[2.4MHz\]
B. \[4.2MHz\]
C.\[24MHz\]
D. \[42MHz\]

Answer 1

Hint:The meaning, concept and the formula of bandwidth is required to solve this question. The complete frequency range needed to pass a certain signal that has been modulated to transmit data without distorted or lost data is known as the bandwidth.

Complete step by step solution:
1. Each of these signals has a particular range of frequencies, and the message signal in a communication system can be voice, music, a picture, or computer data.

2. Depending on the band of frequencies thought to be crucial for transmission, a specific signal will require a specific type of communication system.

3. The frequency range between \[300Hz - 3100Hz\] is regarded as appropriate for speech transmissions. Therefore, for commercial telephone transmission, speech signal needs a bandwidth of \[2800{\rm{ }}Hz{\rm{ }}\left( {3100{\rm{ }}Hz{\rm{ }} - {\rm{ }}300{\rm{ }}Hz} \right).\] Because musical instruments create high frequencies, a bandwidth of about \[20kHz\] is needed to broadcast music. The range of frequencies that are heard is from \[20{\rm{ }}Hz - 20{\rm{ }}kHz\].

4. Video signals for transmission of pictures require about \[4.2MHz\] of bandwidth.

Hence, the correct answer is option B.

Note: The frequency range that makes up bandwidth is one continuous band of frequencies. It is measured in Hertz. An information transmission system's main function is to send data from a transmitter that is situated in one location to a receiver that is typically placed distant from the transmitter. A TV signal contains both voice and picture and is usually allocated \[6MHz\] of bandwidth for transmission.