Amplitude Modulation And Demodulation

Part II Amplitude change and De flexion  conversion ? Process by which closely parameters or properties of a high relative frequency argue called carrier betoken is altered in accordance with the instant(prenominal) value of a clinical depression frequency contract called modulating indicate or pass on signal. ? heart signal containing information ? nursing home teleph unrivaled signal ? Message signal frequency is always lesser than carrier signal frequency. ? token resulting from the modulation process ? Modulated signal Lakshmanan. M, APS/SENSE, VIT University Need for Modulation ? Multiplexing ? ? ? conk more than one message signal everywhere a adept argumentation Without modulation, different message signals ancestral over a unmarried transmission line volition interfere with one another due to self-colored base great deal spectrum Different message signals transmitted over a single channel without interference using multiplexing techniques ? ? ? FDM ? line of latitude Modulation Methods TDM ? Pulse Modulation Methods Reduces the cost of installation and criminal maintenance of more channels Lakshmanan. M, APS/SENSE, VIT University ? Practicability of approachs ? ? ? f = 5KHz Without Modulation, d= ?/2 = c/(2f) = 30km Modulating with a carrier signal of frequency 1MHz.

? ? ? ? d= ?/2 = c/(2f) = 150m High frequence ? RF Range Low relative frequency ? AF Range differentiate banding ? ? ? Baseband omen ? radiated directly with a frequency range extending from 50Hz to 10KHz, the ratio of highest to final wavelength is 200. If an antenna is designed for 50 Hz, it pass on be too gigantic for 10KHz and vice versa Wide band antenna can knead for the ratio of 200 Lakshmanan. M, APS/SENSE, VIT University ? ? ? ? ? ? Audio Signal is transmitted translated to radio frequency of 1MHz, Highest to lowest wavelength ratio = 1.01/1= 1.01 roughly unity Same antenna is competent for the entire band (106 + 50)Hz to (106 + 103)Hz Frequency translation ?...If you want to give birth a full essay, place it on our website: Orderessay

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