Question
Download Solution PDFIn TV transmission
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFAmplitude Modulation (AM) is preferred for picture transmission in TV because of the following reasons:
- The distortion which arises due to interference between multiple signals is more in FM than AM because the frequency of the FM signal continuously changes.
- Steady production of the picture is affected because of this.
- If AM were used, the ghost image, if produced is steady.
- Also, the circuit complexity and bandwidth requirements are much less in AM than in FM.
On the other hand, FM is preferred for sound because of the following reasons:
- The bandwidth assigned to the FM sound signal is about 200 kHz, of which not more than 100 kHz is occupied by significant side bands.
- This is only 1.4 % of the total channel bandwidth of 7 MHz. This results in efficient utilization of the channel.
A wave has 3 parameters Amplitude, Phase, and Frequency. Thus there are 3 types of modulation techniques.
Amplitude Modulation: The amplitude of the carrier is varied according to the amplitude of the message signal.
Frequency Modulation: The frequency of the carrier is varied according to the amplitude of the message signal.
Phase Modulation: The Phase of the carrier is varied according to the amplitude of the message signal.
Last updated on May 30, 2025
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