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# Amplitude & Frequency Modulation Techniques - Essay Example

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This report details the theory and mathematical formulation behind Amplitude Modulation and Frequency Modulation. MATLAB/ SIMULINK software development tool will be used to investigate the parameters affecting the performance of AM and FM modulators and  demodulators…

## Extract of sample"Amplitude & Frequency Modulation Techniques"

Download file to see previous pages This essay declares that modulator schemes will be set up for the following modulation techniques:  Double Sideband Amplitude Modulation, Double Sideband Suppressed Carrier Amplitude Modulation, Single Sideband Amplitude Modulation and Frequency Modulation. Demodulator schemes for DSBAM and FM modulation techniques will also be set up.
As the research stresses in amplitude modulation or AM, the amplitude of the carrier wave is varied by the modulating or information signal. The carrier is always the higher frequency signal while the modulating signal can be an audio or video signal. The basic form of amplitude modulation is Double Sideband or DSB. The center of the spectrum is the frequency of the AM signal with sidebands at the left and the right – Lower Sideband and Upper Sideband. Take note that the bandwidth required for AM is twice the bandwidth of the modulating signal. From the transmitted power equation, we can also derive the formula for efficiency. This parameter is the percentage of the power used for transmitting information contained in the modulating signal over total power utilized. The system diagram of an AM signal demodulator is shown in Figure 3.6. The demodulator output contains a constant DC component that is later removed in succeeding stages after the demodulator. The diode produces the rectified half-wave AM signal while the RC circuit smoothens this signal to approximate the original modulating signal. ...Download file to see next pagesRead More
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