User:Rajuabbengula/sandbox

'''MODULATION DEFINATON: Modulation is the process whereby some characteristic of one wave is varied in accordance with some characteristic of another wave Why Modulation? There are two principal motivating reasons for modulation. We described the first in Chapter 10: matching the transmission characteristics of the medium, and considerations of power and antenna size, which impact portability. The second is the desire to multiplex, or share, a communication medium among many concurrently active users. TYPES OF MODULATION: modulation is the process of changing amplitude or frequency or phase of a carrier wave in accordance with the intensity of the signal. Accordingly, there are three basic types of modulation, namely ; (i) amplitude modulation (ii) frequency modulation (iii) phase modulation Amplitude modulation (AM) :here the amplitude of the carrier signal is varied in accordance to the instantaneous amplitude of the modulating signal. FRQUENCY MODULATION:the frequency of carrier wave is changed in accordance with the intensity of the modulating signal is called frequency modulation (FM). PHASE MODULATION: The phase of carrier wave is changed in accordance with the intensity of the modulating signal is called frequency modulation (FM). https://en.wikipedia.org/wiki/Wikimedia_Commons#/media/File:Broadway_tower_edit.jpg