Question
Download Solution PDFModulation is required
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFModulation is a process of varying one or more properties of a carrier signal (High-frequency signal) with a modulating signal (Low-frequency signal). Hence, Modulation is the process of combining signal and radiofrequency.
Need for Modulation:
- It is needed in order to match the characteristics of the input signal to that of channel characteristics.
- Low-frequency signals can be multiplexed with high-frequency signals to travel long distances.
- Wireless transmission of low pass signal is made possible due to modulation.
- Practically realization of antenna size can be achieved.
- Some modulation technique reduces the effect of noise on the signal.
The AM, FM, and PM output waveforms are as shown:
In Frequency modulation, the frequency of the carrier is varied according to the amplitude of the message signal and the amplitude of the carrier remains constant.
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