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Electronics Tutorial

Electronics for beginners

 
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Electronics Tutorial for Beginners

ABC of Electronics Offering free comprehensive basic electronics tutorial. In this Electronics Tutorial we have explained the basic electronic concepts. Here you can find 8051 Tutorials & 555 Timer Tutorials which are commonly used in electronics. Every effort is made to keep the website up and running smoothly

Modulation and Demodulation

Modulation

In Context to a modem, the modulation process involves the conversion of the digital computer signals ( logic 1 and Logic 0 states) to analog audio-frequency (AF) tones. Digital highs are renewed to a tone having a certain constant pitch; digital lows are transformed to a tone having a varying constant pitch. These states change very quickly making a hiss sound as an output of the computer modem. The demodulation process converts the audio tones back into digital signals that are computer friendly as described below.

Demodulation

Demodulation is the process of decoding an analog signal into digital data. When data is shifted over phone lines, a modem modulates the data into audible tones carried on frequencies between 0 Hz and 4 KHz. Once the data reaches its required destination, another modem demodulates the signal back into digital data. Cable TV networks also use modulation techniques to transfer data.

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