Process of amplitude modulation, Electrical Engineering

Assignment Help:

Q. Process of Amplitude Modulation?

In AM the message signal is impressed on the amplitude of the carrier signal. There are several different ways of amplitude modulating the carrier signal by the message signal, each of which results in different spectral characteristics for the transmitted signal. Four methods are:

• Conventional (standard) double-sideband AM

• Double-sideband suppressed-carrier AM

• Single-sideband AM

• Vestigial-sideband AM.

AM, as its name implies, carries the modulating signal x(t) ina time-varying amplitude of the form

a(t) = Ac[1 + mAx(t)]

where the constant Ac stands for the unmodulated carrier amplitude, and mA is the modulation index. The resulting modulated wave is

1465_Process of Amplitude Modulation.png

whereas the sinusoidal carrier waveform is given by

c(t) = Ac cos(ωct + φc) = Accos(2πfct + φc)

Sometimes the standard AM signal is expressed in the form of

xc(t) = sAM(t) = [Ac + f(t)] cos(ωct + φc)

in which the total amplitude of the carrier [Ac +f(t)] is a linear function of the message. Figure illustrates the AM waveforms.


Related Discussions:- Process of amplitude modulation

Difference between cmp and sub instructions, Mention how do the following i...

Mention how do the following instructions differ in their functionality SUB: It performs changes the destination operand and the subtraction operation. CMP: Comparison instr

D.c. generator, D.C. Generator A magnetic field is produced by af...

D.C. Generator A magnetic field is produced by afield coil supplied with a D.C. current and a rotor is placed between shaped pole pieces and wound with an armature wind

The classical free electron theory, The free electron theory of metals was ...

The free electron theory of metals was first proposed by Drude and later improved by Lorentz. The main postulates of this theory are 1.       All metal contain, adequate number

#choke coil, #what is the procedure of the choke coil experiment

#what is the procedure of the choke coil experiment

Logic circuits, : A farmer owns two barns; one north of a creek and the oth...

: A farmer owns two barns; one north of a creek and the other south of the creek. The farmer has a Cabbage, a Goat, and a Wolf. The Farmer needs to put each item in a barn every ni

Show the subtraction method, Q. Show the Subtraction Method? For this p...

Q. Show the Subtraction Method? For this procedure (method), start with a weighted position value greater that the number. If the number is greater than the weighted position f

Find terminal line-to-neutral voltage of each phase winding, (a) A wye-conn...

(a) A wye-connected generator is to be designed to supply a 20-kV three-phase line. Find the terminal line-to-neutral voltage of each phase winding. (b) If the windings of the g

How do you find the insulation resistance of transformer, Q. How do you cal...

Q. How do you calculate the insulation resistance of transformer and what is the minimum value? Ans. The insulation resistance of the transformer will be calculated by using

Explain graphics adapters, Explain graphics adapters. Video card conve...

Explain graphics adapters. Video card converts digital output by the computer in an analog video signal and sends the signal by a cable to the monitor also termed as a graphic

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd