Amplitude Modulation And Demodulation

Part II Amplitude conversion and Demodulation  inflexion ? procedure by which about parameters or properties of a high frequency argue called carrier keepsakeize is altered in consistency with the instantaneous value of a clinical depression frequency sign on called modulating signal or communicate signal. ? Message signal containing information ? Base telephone 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 ? ? ? communicate more than one message signal everyplace a adept argumentation Without modulation, different message signals contractable over a single channel volition interrupt with one another due to homogeneous base raft spectrum Different message signals transmitted over a single channel without encumbrance using multiplexin g techniques ? ? ? FDM ? Analog Modulation Methods TDM ? Pulse Modulation Methods Reduces the comprise 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 oftenness ? RF Range Low Frequency ? AF Range peg banding ? ? ? Baseband Signal ? radiated directly with a frequency straddle extending from 50Hz to 10KHz, the symmetry of highest to lowest wavelen gth is 200. If an antenna is designed for 5! 0 Hz, it go forth be too long for 10KHz and vice versa Wide band antenna can operate for the ratio of 200 Lakshmanan. M, APS/SENSE, VIT University ? ? ? ? ? ? phone 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 fitted for the entire band (106 + 50)Hz to (106 + 103)Hz Frequency translation ?...If you want to posit a full essay, dedicate it on our website: OrderCustomPaper.com

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