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Angle Modulation
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Angle Modulation-Communication Systems-Lecture Slides, Slides of Data Communication Systems and Computer Networks
Sir Chiranjeev Mehta delivered this lecture at Alagappa University for Communication Systems course. It includes: Instantaneous, Phase, Instananeous, Sine, Voltage, Oscillator, Half, credit, Submssion, Bandwidth, Calculate
Typology: Slides
2011/2012
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Angle Modulation
Angle Modulation
Two Cases:
1) Frequency Modulation
The instantaneous frequency of the carrier signal
is changed with respect to the message signal
2) Phase Modulation
The phase of the carrier signal is changed
according to the variations in the message signal
The Angle of the carrier signal is varied
with the modulating signal m(t)
Frequency Modulation
In PM the varies linearly with “the derivative of m(t)”
To form FM signal, make to vary with m(t) only.
m ( t )
Instantaneous frequency for FM
The angle becomes:
where is a constant
The Resulting FM wave is:
Frequency Modulation of a sine wave
A Basic FM
Example 5.1 (B.P. Lathi)
k (^) f and kp are 2 105 and 10 , respectively
Sketch FM and PM waves for the following signal in figure (a) below
Hint: PM for m(t) is FM for m ( t )
Example 5.2 (B.P. Lathi)
k (^) f and kp are and , respectively 2
2 105
Sketch FM and PM waves for the digital signal in figure (a) below
Hint: PM for m(t) is FM for m ( t )