Modulation
Introduction - Hi guys, Have you heard about modulation, what is mean by modulation, what are different types of modulation? I am sure you have if you are Engineering student. So, in this blog we will discuss basics of modulation. So, our human voice signal contains the frequency up to 3 kHz and entire audible spectrum is between 20 Hz to 20 kHz. These low frequency signal called Baseband signal. Baseband signal can not be transmitted over long distance, we need to convert into high frequency signal to transmit over long distance. This high frequency signal is called Carrier signal. What is Modulation? Modulation is a process of converting baseband signal into a signal that varies with one of its properties like amplitude, frequency, phase. We obtain modulated signal by adding carrier signal to baseband signal. Why we need Modulation? Reduce the antenna size – So, how we can reduce the size of the antenna, we will understand this point with the help of some basic calculation. L