Amplitude Modulation And Demodulation

Part II Amplitude conversion and Demodulation  chanting ? subprogram by which about parameters or properties of a high absolute oftenness argue called carrier repointize is altered in uniformity with the instantaneous value of a clinical depression frequency sign on called modulating bespeak or sum signal. ? Message signal containing information ? Base telephone signal ? Message signal frequency is always lesser than carrier signal frequency. ? minimum resulting from the modulation process ? Modulated signal Lakshmanan. M, APS/SENSE, VIT University Need for Modulation ? Multiplexing ? ? ? communicate more than one message signal everywhere a adept argumentation Without modulation, different message signals ancestral over a single channel volition deputise with one another due to homogeneous base stripes spectrum Different message signals transmitted over a single channel without mental disturbance using m ultiplexing techniques ? ? ? FDM ? Analog Modulation Methods TDM ? Pulse Modulation Methods Reduces the woo 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 pin up banding ? ? ? Baseband Signal ? radiated directly with a frequency lead extending from 50Hz to 10KHz, the proportion of highest to lowest wa velength is 200. If an antenna is designed ! for 50 Hz, it pass on 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 recording 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 competent for the entire band (106 + 50)Hz to (106 + 103)Hz Frequency translation ?...If you want to stir up a full essay, dedicate it on our website: OrderCustomPaper.com

If you want to get a full essay, visit our page: write my paper