Input device is used to transmit data to the processing and storage hardware. The data to be input can be in source from, a form that human perceive, or in machine form, a form that can be electronically sensed by another computer. Any device that allows information from outside the computer to be communicated to the computer is considered an input device. Since the central processing unit ( CPU ) of a digital computer can understand only discrete binary information, all computer input devices and circuitry must eventually communicate with the computer in this form. Many devices are capable of performing this task. Some common computer graphics input devices are:.
1) Keyboard.
2) Trackball.
3) Joystick.
4) Mouse.
5) Paddle controls.
6) Light Pen.
7) Magnetic table .
8) Digitizing camera.
9) Scanner.
10) Bar Code Reader.
11) Modem.
12) Voice Recognition device.
Variety of Input devices:.
.
Input devices are of two basic types one is analog and another is digital. Humans perceive a continuous universe; digital devices sense a discrete universe consisting of discrete segments. For example, the temperature indicated by a digital thermometer may be observed to change 73 to 74 degrees instantaneously. The device that is capable of recording continuous changes is an analog device; the device which can sense only discrete changes is a digital device.
Time is also perceived as continuous. Therefore, a digital device must take "snapshots" of the environment with sufficient rapidity if a high degree of accuracy is to be attained. When a computer takes a snapshot of the environment by obtaining a value from an input device, is to be strobe the device.
Analog to Digital Conversion:.
In order to send analogue signals over a digital communication system, or process them on a digital computer, we need to convert analogue signals to digital ones. The conversion of continuous analog signals to discrete data is called analog-to-digital conversion, or simply A/D conversion.
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...
