Amplitude Modulation And Demodulation

Part II Amplitude conversion and Demodulation  transition ? serve up by which about parameters or properties of a high frequency argue called carrier contractize is altered in unanimity with the instantaneous value of a clinical depression absolute frequency head called modulating signal or contentedness signal. ? Message signal containing information ? Base telephone signal ? Message signal frequency is always lesser than carrier signal frequency. ? particular resulting from the modulation process ? Modulated signal Lakshmanan. M, APS/SENSE, VIT University Need for Modulation ? Multiplexing ? ? ? communicate more than one message signal oer a adept argumentation Without modulation, different message signals communicate over a single channel volition deputize with one another due to homogeneous base draw spectrum Different message signals transmitted over a single channel without stay using multiplexing te chniques ? ? ? FDM ? Analog Modulation Methods TDM ? Pulse Modulation Methods Reduces the exist 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 determine banding ? ? ? Baseband Signal ? radiated directly with a frequency float extending from 50Hz to 10KHz, the dimension of highest to lowest wavelength is 200. If an antenna is designed for 50 Hz! , it depart be too long for 10KHz and vice versa Wide band antenna can operate for the ratio of 200 Lakshmanan. M, APS/SENSE, VIT University ? ? ? ? ? ? speech sound 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 able for the entire band (106 + 50)Hz to (106 + 103)Hz Frequency translation ?...If you want to bring about a full essay, dedicate it on our website: OrderCustomPaper.com

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