In the ADC the analogue signal is sampled (i.e. measured at regularly spaced instants) and then quantised (i.e. converted to discrete numeric values). The greater the of quantisation levels, the lesser the quantisation error. A digital-to-analogue converter (DAC) performs the converse operation to the ADC.
The most popular device for inputting source data is the keyboard.The part of the computer that we come into most contact with is probably the piece that we think about the least. But the keyboard is an amazing piece of technology. .
Windows keyboard .
At its essence, a keyboard is a series of switches connected to a microprocessor that monitors the state of each switch and initiates a specific response to a change in that state. .
Mouse.
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Mice come in all shapes and sizes. This is an older two-button mouse.
Mice first broke onto the public stage with the introduction of the Apple Macintosh in 1984, and since then they have helped to completely redefine the way we use computers. .
Every day of your computing life, you reach out for your mouse whenever you want to move your cursor or activate something. Your mouse senses your motion and your clicks and sends them to the computer so it can respond appropriately. .
In the beginning there was no need to point because computers used crude interfaces like teletype machines or punch cards for data entry. The early text terminals did nothing more than emulate a teletype (using the screen to replace paper), so it was many years (well into the 1960s and early 1970s) before arrow keys were found on most terminals. Full screen editors were the first things to take real advantage of the cursor keys, and they offered humans the first crude way to point. .
Light pens were used on a variety of machines as a pointing device for many years, and graphics tablets, joy sticks and various other devices were also popular in the 1970s. None of these really took off as the pointing device of choice, however.
Inside & Outside the Computer I would to consider myself an expert when it comes to putting computers together. ... Two of these items are input devices and one is an output device. The one output device is the monitor. ... The two different input devices are the mouse which controls the pointer on the screen. The other is the keyboard which is used to input letters in anything that needs letters to functions. ...
The only problem being that without any input Peripherals you cannot tell the computer to do any of the above processes, and if you could, without an output device of some kind, the computer has no way of delivering the result to the user! ... These can be separated into two categories: - Input devices An input device is any machine that feeds data into a computer. For example, a keyboard is an input device. Input devices other than the keyboard are sometimes called alternate input devices. ... Output devices An output device is any machine capable of representing information from a computer. ...
Data and information need to be stored after input, during processing, and before needed as output. Primary Storage Areas The primary storage unit can be conceptually subdivided into input storage, output storage, program or instruction storage, and working storage. Storage receives data from input devices, program storage contains program instructions, and output storage contains information waiting for transfer to output devices. ... An address register may hold the address of the storage location of data, or the address of an input/output device or a control function. ... Thus secondar...
A Computer is defined as; an electronic device that performs four basic operations: input, processing, output, and storage. ... The Information Processing Cycle includes; Input, Processing, Storage, and also Output. Input can take a variety of forms, from commands you enter by keyboard to data from another computer or device. ... Processing is the manipulation done by the input by a program, to convert the input into information. ... Output devices can be other computers, display screens, speakers, and printers. ...
The Input/Output devices became much faster by the use of magnetic tape. ... There was a big flexibility with input/Output devices. ... The faster input and output devices made possible multiprocessing and multiprogramming. ... There was a great versatility of Input / Output devices. ... Many other Input / Output devices were developed for example : Optical readers, by which whole documents could be fed into computers, Audio response terminals, by which an operator can vocally input data or instructions and scanners, by which pictures can be fed etc.. ...
The Analytical Engine is regarded as the first real predicessor to the modern computer because it has the following: An input device, output device, control unit, processor, and storage. ... This brings me to the computer I have before me. ... The moniter requires a source of input which is where the video card comes into play. ... Before CRT(Cathode Ray Tube) moniter came into use, the teletyper was the standard device which was a large, load device that printed input and output on paper. ... Since the first computer was built, the computer industry has flourished into a massive, fast...
"COMPUTER PROGRAMMERS write, test, and maintain programs or software that tell the computer what to do. ... They develop and write computer programs to store, locate, and retrieve specific documents, data, and information. ... A lot of computer programmers will need to be able to do some of the following tasks: • "Write programs creating a logical series of instructions the computer can follow, applying knowledge of computer capabilities, subject matter, and symbolic logic" • "Code instructions into programming languages and test and debug programs to get intended results" &bul...
