# Telecommunication Principles Engineering

May 5th, 2015
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This paper presents about FM modulator and Abstractdemodulator.In electronic and telecommunication, modulation process of varying one or more properties of a high frequency periodic waveform , called carrier signal with a modulating signal which typically contain information to be transmitted.

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Telecommunication Principles EngineeringFM Modulator and DemodulatorNor Ayu Hidayah Binti Mohd Safri (31743) Department of Electronic Engineering (Computer) Universiti Malaysia Sarawak, Malaysia Kuching, Sarawak, Malaysia Email : nor_ayu92@yahoo.comAbstract This paper presents about FM modulator and Abstractdemodulator.In electronic and telecommunication, modulation process of varying one or more properties of a high frequency periodic waveform , called carrier signal with a modulating signal which typically contain information to be transmitted. The modulator and demodulator contain an optimized direct digital frequency synthesizer (DDFS) based on quarter-wave symmetry technique for generating the carrier frequency with spurious free dynamic range (SFDR) of more than 64 dB. 64 In this article also will have about the performance in FM. Also have an example for each demodulator and modulator for FM.it can be processed and used on the receiver end.II. FM Modulator ModulatorIn angle modulation, the amplitude of the signal is held constant and the phase is being varied with the message.An angle modulated signal is of the form xc(t) = Ac cos(?ct + ?(t)).......... (1) The instantaneous phase of xc(t) is given by ?i(t) = ?ct + ?(t).................(2) and the instantaneous frequency is given by ?i(t) = d?i(t)/dt = ?c + d?(t)/dt........... (3) Using this approach, if the message is proportional to ?(t), which is the phase deviation, then we have phase modulation. If the me

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