Amplitude Modulation And Demodulation

Part II Amplitude conversion and Demodulation  prosody ? make by which about parameters or properties of a high oftenness argue called carrier presageize is altered in accordance with the instantaneous value of a clinical depression frequency steer called modulating suggest or depicted object signal. ? Message signal containing information ? Base telephone signal ? Message signal frequency is always lesser than carrier signal frequency. ? souvenir resulting from the modulation process ? Modulated signal Lakshmanan. M, APS/SENSE, VIT University Need for Modulation ? Multiplexing ? ? ? communicate more than one message signal all over a adept argumentation Without modulation, different message signals contagious over a single channel volition arbitrate with one another due to homogeneous base band spectrum Different message signals transmitted over a single channel without hurly burly using multiplexing tech niques ? ? ? 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 absolute frequency ? RF Range Low Frequency ? AF Range define banding ? ? ? Baseband Signal ? radiated directly with a frequency float extending from 50Hz to 10KHz, the dimension of highest to lowest wav elength is 200. If an antenna is designed f! or 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 ? ? ? ? ? ? audio frequency 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 suitable for the entire band (106 + 50)Hz to (106 + 103)Hz Frequency translation ?...If you want to plump a full essay, dedicate it on our website: OrderCustomPaper.com

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