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by Dinesh Thakur Category: DIGITAL CONCEPTS

DIP switches are those nasty, tiny plastic toggle switches that come mounted together in a row on a little box-like part attached to your computer's motherboard or on some of your add-in boards. Each individual switch in a DIP switch unit can be set either on or off, allowing you to control some aspect of your computer's function. For example, on the older IBM pcs and compatibles, you had to set the DIP switches to match the amount of memory installed in your computer, to tell it what kind of monitor you had, and so on. On the add-in modem board I just installed, I had to flip some of the DIP switches so the computer would know where to find the board electronically.



 
by Dinesh Thakur Category: DIGITAL CONCEPTS

The basic modulations

No modulation

Take the example of an opera broadcast on a radio station: how music, that is to say, an audio signal, it may be channeled through wave electromagnetic? Audible sound waves have frequencies between 20 Hz to 20 kHz for bass and treble. It would be tempting to simply convert the sound wave in radio waves of the same frequency. Unfortunately, there would be several problems: first, the low radio frequencies also are very difficult to produce and capture; then two simultaneous radios would overlap since they would be issued on the same frequency band (20 Hz to 20 kHz) and would cacophony.

 
by Dinesh Thakur Category: DIGITAL CONCEPTS

This was first created by an English mathematician named George Boole in 1847 and yet, in one of the strange quirks of the computer industry, is now used in everything from circuit design to searching the Internet. In essence Boole developed a system for reducing complex questions into simple yes or no answers by using what are known as truth tables, sometimes called gates.



 
by Dinesh Thakur Category: BINARY CODE

Earlier computers were used only for the purpose of calculations i.e. they were only used as a calculating device. But now computers are not just used for numeric representations, they are also used to represent information such as names, addresses, item descriptions etc. Such information is represented using letters and symbols. Computer is a digital system and can only deal with l's and 0’s. So to deal with letters and symbols they use alphanumeric codes.



 
by Dinesh Thakur Category: BINARY CODE

Excess-3, also called XS3, is a non-weighted code used to express decimal number-s. It is another important binary code. It is particularly significant for arithmetic operations as it overcomes the shortcomings encountered while using the 8421 BCD code to add two decimal digits whose sum exceeds 9. This code is used in some old computers.

 
by Dinesh Thakur Category: BINARY CODE

The binary coded decimal (BCD) is a type of binary code used to represent a given decimal number in an equivalent binary form. Its main advantage is that it allows easy conversion to decimal digits for printing or display and faster calculations.

 
by Dinesh Thakur Category: BINARY CODE

Digital data is represented, stored and transmitted as groups of binary digits also known as binary code. The binary codes can be classified as shown in Fig.



 
by Dinesh Thakur Category: BINARY CODE

The Gray code was designed by Frank Gray at Bell Labs in 1953. It belongs to a class of codes called the minimum change code. The successive coded characters never differ in more than one-bit. Owing to this feature, the maximum error that can creep into a system using the binary gray code to encode data is much less than the worst -case error encountered in case of straight binary encoding.

 

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About Dinesh Thakur

Dinesh ThakurDinesh Thakur holds an B.SC (Computer Science), MCSE, MCDBA, CCNA, CCNP, A+, SCJP certifications. Dinesh authors the hugely popular Computer Notes blog. Where he writes how-to guides around Computer fundamental , computer software, Computer programming, and web apps. For any type of query or something that you think is missing, please feel free to contact us.



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