Exp.(6) Frequency modulation(fm). Done by: BASIL Z. BARZAQ 120070737 BASSAM H. SALLOUHA 120071676 MOHAMED A. ELSHAER 120071709. Supervised by: Eng.: Mohammed Kamel AbuFoul. May 2010. OBJECTIVES.
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BASIL Z. BARZAQ 120070737
BASSAM H. SALLOUHA 120071676
MOHAMED A. ELSHAER 120071709
Eng.: Mohammed Kamel AbuFoul
1)In analog applications,the
carrier frequency is varied
in direct proportion to
changes in the amplitude
of an input signal.
2) The FM-modulated signal has its instantaneous frequency that varies linearly with the amplitude of the message signal.
Now we can get the FM-modulation by:
Kƒ is the sensitivity factor, and represents the frequency deviation rate as a result of message amplitude change.
The instantaneous frequency is:
The maximum deviation of Fc (which represents the max. shift away from Fc in one direction) is:
The FM-modulation is implemented by controlling the instantaneous freq. of a voltage-controlled oscillator(VCO).
The amplitude of the input signal controls the oscillation freq. of the VCO output signal.
title('fm modulation of input signal')
of input signal')
title('magnitude spectrum of the fm')
title('the differentiation of fm ')
for i =2:length(E)
title(' the AM signal and envelope signal ')