Amplitude Modulation
START
STOP
MODULATE
DEMODULATE
Message Signal
m(t)=A
m
cos(2πf
m
t)
Message Signal Amplitude
10
Volts
Message Signal Frequency
3000
Hz
Carrier Signal
c(t)=A
c
cos(2πf
c
t)
Carrier Signal Amplitude
10
Volts
Carrier Signal Frequency
20
KHz
Amplitude Modulated Signal
Result
s(t)=[A
c
+A
m
cos(2πf
m
t)]cos(2πf
c
t)
Modulation Index μ=A
m
/A
c
=
1
Critical Modulation
Amplitude Modulated Signal
Message Signal
m(t)=A
m
cos(2πf
m
t)
Message Signal Amplitude
10
Volts
Message Signal Frequency
3000
Hz
Carrier Signal Amplitude
10
Volts
Carrier Signal Frequency
20
KHz
Result
s(t)=[A
c
+A
m
cos(2πf
m
t)]cos(2πf
c
t)
Modulation Index μ=A
m
/A
c
=
1
Critical Modulation
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