Reception Of Voice Signal Using Square Wave Frequency Modulation

Mohd Husni , Zakaria (2008) Reception Of Voice Signal Using Square Wave Frequency Modulation. Project Report. UTeM, Melaka,Malaysia. (Submitted)

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Abstract

This project is referred to the designing of reception of voice signal (300Hz to 3000Hz kHz) using square wave frequency modulation. It is intended to receive the signal from transmitter source by using optical fiber system. This device is focusing on the application of FSK demodulation and Square to Sine Oscillator circuit which has their own function to complete this square wave/digital modulation. The aim of this project is to use digital signal because it is much easier to transmit and offer less room for errors to occur and produces the accurate data transmission that is faster transmission rates and better productivity. FSK Demodulation has been chosen because it is the most common form of digital modulation in the high-frequency radio spectrum, and has important applications in telecommunication circuits. It uses FSK Demodulator XR2211 IC and work as data signal converted into a specific frequency or tone in order to transmit it over optical fiber or LED source to a destination point. Carrier frequency for this demodulation is 30 kHz While Square to Sine Wave Oscillator is an approach to generating sine waves is to filter a square wave. This leaves only the sine wave fundamental as the output. This project uses the application of an optical fiber as the transmission medium due to relative newness of the technology. It provides the better system performance, immunity to electrical noise, lower signal attenuation (loss) and resistant to temperature variations and many others.

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