amplitude odulation

2. It's is the process by which a carrier wave is altered in such a way
that it is also to carry information on it.
There are three basic methods to do this:
• Amplitude Modulation (AM)
• Frequency Modulation (FM)
• Phase Modulation (PM)
Modulation

3. In amplitude Modulation (AM), the amplitude of the carrier wave
is varied in proportion to the message signal, and the other
factors like frequency and phase remain constant.
AM
Modulator
Amplitude Modulation
Vm(t)= VmSin(2πfmt+Φ)
Vc(t)= VcSin(2πfct+Φ)
Vam(t)= (Vc+VM(t))Sin(2πfct+Φ)

4. Amplitude
modulation
Vestigial Sideband
Modulation (VSB).
Single Sideband
Modulation (SSB).
Double sideband-suppressed
carrier modulation (DSB-SC)
Types of Amplitude
Modulation

5. Under Modulation
μ < 1
Over Modulation
μ >1
Perfect Modulation
μ = 1
In Amplitude Modulation (AM), Modulation index is defined as the
measure of extent of amplitude variation about an un modulated
maximum carrier

6. • Very simple to implement
• AM signals are reflected by the earth
from the ionosphere layer
• Low bandwidth
• Low cost
• More power is required
• Data loss
• AM detectors are sensitive to noise
Advantages of AM
Disadvantages of AM

7. Application of Amplitude Modulation
• Used to transmit the signal over, long distances
• Used for radio transmission
• It's also applied in two-way communication for air
traffic control