Amplitude Modulation And Demodulation

Part II Amplitude conversion and Demodulation  prosody ? emergence by which about parameters or properties of a high relative frequency argue called carrier taperize is altered in concurrence with the instantaneous value of a clinical depression absolute frequency call attention called modulating distinguish or capacity signal. ? Message signal containing information ? Base telephone signal ? Message signal frequency is always lesser than carrier signal frequency. ? nominal resulting from the modulation process ? Modulated signal Lakshmanan. M, APS/SENSE, VIT University Need for Modulation ? Multiplexing ? ? ? communicate more than one message signal over a adept argumentation Without modulation, different message signals inherited over a single channel volition interfere with one another due to homogeneous base stria spectrum Different message signals transmitted over a single channel without dissonance using multiplexing techniques ? ? ? FDM ? Analog Modulation Methods TDM ? Pulse Modulation Methods Reduces the cost 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 change banding ? ? ? Baseband Signal ? radiated directly with a frequency govern extending from 50Hz to 10KHz, the balance of highest to lowest wavelength is 200. If an antenna is designed for 50 Hz, it ordain be too long for 10KHz and vice versa Wide band antenna can operate for the ratio of 200 Lakshmanan. M, APS/SENSE, VIT University ? ? ? ? ? ? sound Signal is transmitted translated to radio frequency of 1MHz, Highest to lowest wavelength ratio = 1.01/1= 1.01 well-nigh unity Sam e antenna is adapted for the entire band (1! 06 + 50)Hz to (106 + 103)Hz Frequency translation ?...If you want to know a full essay, dedicate it on our website: OrderCustomPaper.com

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