A Device That Converts Digital Data From a Computer Into Analog Signals and Back Again
This tutorial explains information modulation in computer networks. Learn what data modulation is and how it works in computer networks.
Data modulation is a process that converts analog signals into digital signals and digital signals into analog signals. Computers shop and process data in digital format. Information modulation allows computers to store and process analog signals.
Let's take a simple example. When you lot record and play an audio clip, the following happens.
Yous use a microphone to tape the audio clip. The microphone sends your vocalisation to the computer. Since the human voice consists of analog signals, the computer converts the received voice into digital signals before processing and storing them onto the hard deejay.
When the recorded clip is played, the computer reads digital signals from the hard deejay and converts them into analog signals earlier sending them to the speaker.
The following image shows this process.
Modulators and demodulators are devices or chips or components that convert analog signals into digital signals and digital signals into analog signals, respectively.
Data modulation is not merely used within the calculator, just information technology is also used outside the computer. It allows computers to send digital signals on a media that can only carry analog signals. It converts signals in such a mode that they go suitable for transport on a communication path that is not designed to carry such signals.
For case, telephone lines are designed to deport analog signals. Through information modulation, the aforementioned telephone lines tin besides be used to provide the Internet facility. To provide the Internet facility through phone lines, a device known every bit the modem is used. A modem can act as both a modulator and a demodulator.
A modem connects a computer to the ISP network via a telephone line. It modulates digital signals into analog signals at the transmitting end, then demodulates analog signals into digital signals at the receiving end.
How does the data modulation piece of work?
To convert digital signals into analog signals, a simple analog wave, known equally the carrier wave, is combined into digital signals. A carrier wave does non contain any information or data. In elementary words, it'southward merely a messenger that transfers information between two nodes.
An analog wave has iv properties; amplitude, frequency, wavelength, and stage. From these, amplitude and frequency are used to blend digital signals. To load digital signals on the analog moving ridge, the modulator modifies either amplitude or frequency in a pre-defined way.
After modification, the modulator loads the composite wave on the media. When the blended moving ridge reaches its destination, the demodulator separates the information from the blended moving ridge past using the aforementioned pre-defined mode. After separation, the data is sent to its destination in the digital format and the carrier wave is discarded.
The following image shows an case of this procedure.
AM / FM Radio
A radio uses radio waves to receive the manual from broadcasting stations. Radio waves can deport merely analog signals. To transmit digital signals on radio waves, radio stations also utilise data modulation.
As mentioned to a higher place, digital signals can exist mixed in the carrier moving ridge either by modifying the amplitude or by modifying the frequency of the carrier wave. Based on the modified property, a radio station can be categorized into two types; AM radio station and FM radio station.
To circulate the digital signals: -
An AM (Amplitude Modulation) radio station modifies the aamplitude of the carrier wave.
An FM (Frequency Modulation) radio station modifies the frequency of the carrier wave.
Radio stations may likewise alter the stage (third property) of the carrier wave to broadcast multiple signals.
Digitizing analog signals
To convert analog signals into digital signals, an ADC (Analog to Digital Converter) is used. An ADC is an integrated electronic circuit. It takes input analog signals and converts them into digital (binary) signals.
An ADC converts the output data into a series of digital values past approximating the signals with stock-still precision. In each bicycle of the analog betoken, an ADC measures all the falling and rising of signals and converts them into digital values.
To empathise how an ADC converts analog signals into digital signals, think nigh a staircase and a ramp. A ramp is analog considering information technology has an space number of heights. To construct a parallel staircase, a constructor uses sample heights of the ramp. The more samples the constructor takes, the more authentic the staircase will be.
The procedure of measuring the elevation and width of steps works similarly to the process of digitizing analog signals.
That's all for this tutorial. In this tutorial, we discussed data modulation and learned how it works in figurer networks.
By ComputerNetworkingNotes Updated on 2022-04-09 07:45:16 IST
Source: https://www.computernetworkingnotes.com/networking-tutorials/data-modulation-in-computer-networks.html
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