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A: Amplitude Modulation & Demodulation Objectives: To study the function of Amplitude Modulation & Demodulation (Under modulation, Perfect modulation & Over modulation) using Matlab Simulink. Theory: Amplitude Modulation is defined as a process in which the amplitude of the carrier wave c(t) is varied linearly with the instantaneous amplitude of the message signal m(t). The standard form of an amplitude modulated (AM) wave is defined by where s(t) = A$_c$ [1 + K$_a$m(t)cos(2$\pi$f$_c$t)] K$_a$ is a constant called the amplitude sensitivity of the modulator. Basically amplitude modulated signal is generated by product modulator. The inputs to the product modulator are message signal and carrier signal. Demodulation is the process of extracting the baseband message signal from the carrier so that it may be processed at the receiver. For that purpose various methods are used like diode detector method, product detector method, filter detector etc. The same has been implemented on simulink model. Low pass filter has been implemented to extract the carrier from the modulated signal. Low pass filter (LPF), filters out the high frequency component and allows the low frequency component to pass. Since the carrier signal is of relatively much higher frequency than that of message signal, carrier signal is attenuated while the message signal is received at the receiver. Simulink model

          A: Amplitude Modulation & Demodulation
Objectives: To study the function of Amplitude Modulation & Demodulation (Under modulation,
Perfect modulation & Over modulation) using Matlab Simulink.
Theory:
Amplitude Modulation is defined as a process in which the amplitude of the carrier wave c(t) is varied
linearly with the instantaneous amplitude of the message signal m(t). The standard form of an amplitude
modulated (AM) wave is defined by
where
s(t) = A$_c$ [1 + K$_a$m(t)cos(2$\pi$f$_c$t)]
K$_a$ is a constant called the amplitude sensitivity of the modulator.
Basically amplitude modulated signal is generated by product modulator. The inputs to the product
modulator are message signal and carrier signal. Demodulation is the process of extracting the baseband
message signal from the carrier so that it may be processed at the receiver. For that purpose various
methods are used like diode detector method, product detector method, filter detector etc. The same
has been implemented on simulink model. Low pass filter has been implemented to extract the carrier from
the modulated signal. Low pass filter (LPF), filters out the high frequency component and allows the low
frequency component to pass. Since the carrier signal is of relatively much higher frequency than that of
message signal, carrier signal is attenuated while the message signal is received at the receiver.
Simulink model

A: Amplitude Modulation Demodulation
Objectives: To study the function of Amplitude Modulation Demodulation (Under modulation,
Perfect modulation Over modulation) using Matlab Simulink.
Theory:
Amplitude Modulation is defined as a process in which the amplitude of the carrier wave c(t) is varied
linearly with the instantaneous amplitude of the message signal m(t). The standard form of an amplitude
modulated (AM) wave is defined by
where
s(t) = Ac [1 + Kam(t)cos(2πfct)]
Ka is a constant called the amplitude sensitivity of the modulator.
Basically amplitude modulated signal is generated by product modulator. The inputs to the product
modulator are message signal and carrier signal. Demodulation is the process of extracting the baseband
message signal from the carrier so that it may be processed at the receiver. For that purpose various
methods are used like diode detector method, product detector method, filter detector etc. The same
has been implemented on simulink model. Low pass filter has been implemented to extract the carrier from
the modulated signal. Low pass filter (LPF), filters out the high frequency component and allows the low
frequency component to pass. Since the carrier signal is of relatively much higher frequency than that of
message signal, carrier signal is attenuated while the message signal is received at the receiver.
Simulink model

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