Amplitude Modulation And Demodulation

Part II Amplitude conversion and Demodulation  inflection ? execute by which about parameters or properties of a high absolute oftenness argue called carrier polarityize is altered in concord with the instantaneous value of a clinical depression frequency polarity called modulating guide or gist signal. ? Message signal containing information ? Base telephone signal ? Message signal frequency is always lesser than carrier signal frequency. ? sign resulting from the modulation process ? Modulated signal Lakshmanan. M, APS/SENSE, VIT University Need for Modulation ? Multiplexing ? ? ? communicate more than one message signal all over a adept argumentation Without modulation, different message signals familial over a single channel volition interrupt with one another due to homogeneous base annulus spectrum Different message signals transmitted over a single channel without perturbation using multiplexing te chniques ? ? ? FDM ? Analog Modulation Methods TDM ? Pulse Modulation Methods Reduces the equal of installation and maintenance of more channels Lakshmanan. M, APS/SENSE, VIT University ? Practicability of antennas ? ? ? 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 Frequency ? AF Range shorten banding ? ? ? Baseband Signal ? radiated directly with a frequency be adrift extending from 50Hz to 10KHz, the balance of highest to lowest wavelength is 200. If an antenna is designed for 50 Hz, it go forth be too long for 10KHz and vice versa Wide band antenna ca! n operate for the ratio of 200 Lakshmanan. M, APS/SENSE, VIT University ? ? ? ? ? ? auditory sensation Signal is transmitted translated to radio frequency of 1MHz, Highest to lowest wavelength ratio = 1.01/1= 1.01 well-nigh unity Same antenna is capable for the entire band (106 + 50)Hz to (106 + 103)Hz Frequency translation ?...If you want to locomote a full essay, dedicate it on our website: OrderEssay.net

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