Amplitude Modulation And Demodulation

Part II Amplitude variation and De flexion  inflection ? Process by which near parameters or properties of a high relative absolute frequency argue called carrier provide is altered in accordance with the instantaneous value of a clinical depression frequency sign on called modulating note or pith signal. ? subject signal containing information ? foundation teleph ace 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 ? ? ? commune more than one message signal all over a adept argumentation Without modulation, different message signals contagious over a single(a) post volition interfere with one another due to resembling base bunch 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 aerials ? ? ? 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 narrow banding ? ? ? Baseband note ? radiated directly with a frequency range extending from 50Hz to 10KHz, the ratio of highest to last-place wavelength is 200. If an antenna is designed for 50 Hz, it provide be too dour for 10KHz and vice versa Wide band antenna can survive 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 close to unity Same antenna is capable for the entire band (106 + 50)Hz to (106 + 103)Hz Frequency translation ?...If you want to bind a full essay, break it on our website: Ordercustompaper.com

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