Input Device <<-
1.MOUSE
2.KEYBOARD
3.SCANNER
4.BAR CODE READER
5.DIGITAL CAMERA
Output Device <<-
1.MONITOR
2.PRINTER
3.PROJECTOR
4.SPEAKER
Input Device <<-
1.MOUSE<<-Input Device Mouse is also an input device We Can Select any type of text or object on the Screen. Mouse is most popular pointing device. It is a very famous cursor – control device: DOUGLAS ENGEL-BART was one Such inventor. Engelbart ,BART who passed away on Tuesday, July 2 at the age of88, brought us the computer. Mouse In 1970, Engelbart received-a patent for a wooden for a mouse with two wheels and three buttons
Input Device Generally, it has two. buttons called left and right button. and scroll bar is present at the mid Mouse can be used to control the position of cursor on Screen. There are two types of mouse available in market.
(1) Wire mouse
(2)Wireless mouse
2.KEYBOARD<<-Input Device Keyboard is a Standard input device. It is a data entry platform of a computer.A computer Keyboard is a Sophisticated electromagnetically component designed to create specialized electronic codes (scan codes) when a key is pressed. Keyboard has 105 – 120 keys.
The invention of the modern Computer Keyboard began with the invention of the typewriter. CHRISTOPHER LATHAM
Sholes patented the typewriter that we commonly use today in 1868
Company mass marketed the first type -writers Starting in 1877
There are two types of Keyboard: available in market.
1) NORMAL KEYBOARD
2) MULTIMEDIA KEYBOARD.
3.SCANNER<<-Input Device Scanner is also an input device, which is used to picture , text , and content directly , it means used can fed information into computer directly without typing the letter using scanner.
Scanner is an Input Device which is used to fed picture, texts and content directly into the computer without typing the latter.
It Scan data or picture and stores it in the computer
It Scan and recorder data ,and then Stores in the computer memory,
4.BAR CODE READER<<-Input Device Bar code Reader is a device used for reading bar coded data(data in form of light and dark lines).
Input Device Bar Coded data is generally used in labeling goods, numbering the books etc it maybe a hand – held Scanner or may be embedded in a stationary scanner.
Bar code Readers scans a bar code image converts it into an alphanumeric value which is then fed to the computer to which bar code readers is connected.
5.DIGITAL CAMERA<<- Input Device A digital Camera is a Input Device,also called a digicam, is a camera that captures photographs in digital memory.most cameras produced digital camera, Digital cameras are now widely incorporated into mobile Input Device like smartphones with the same or more capabilities and features of dedicated cameras. high-end,high-definition dedicated cameras are still commonly take higher-quality photographs.
Digital and digital movie cameras share an optical system, typically using a lens with a variable diaphragm to focus light onto an image, just as controlled amount of light to the image,just as with film, but the image pickup Input Device is electronic rather than chemical.However unlike film cameras,
Output Device <<-
1.MONITOR<<-Monitor is called as a visual-Display unit (VDU) is the main out put device of a computer. it form s images from tiny dots, called pixels, that are arranged in a rectangular from. The sharpness of the image depends upon the number of the pixel.
There are two kinds of viewing screen used for monitor :-
1.Cathode – Ray Tube (CRT)
2.Flat – Panel Display
1.Cathode – Ray Tube (CRT)<<- In the Cathode – Ray monitor , display is made up of small picture elements called pixels for short. The smaller the pixels,the better the image clarity or resolution. Most screen are capable of display 80 character of data horizontally and 25 lines vertically.
2.Flat – Panel Display<<-The flat – panel Display to a class of video devices that have reduced volume, weight and power requirement compared to the CRT. You can hang them on walls or wear them on your wrists. Current uses for flat – panel display include calculators graphics display.
2.PRINTER<<-Printer is the most important output device which is used to print information on paper.
There are two types of printer:-
LASER PRINTER<<-These are non – impact page printer. They use laser light to produce the dots needed to form the characters to be printed an a page.
ADVANTAGES:-
1. Very high speed
2. Very high quality output
3. Gives good graphics quality
4. Support many font and different character sizes.
INKJET PRINTERS<<-Inkjet printer are non – impact characters printers based an a relatively new technology – inkjet printers produce high quality output presentable feature.
The make less noise because no hammering is done and these have many styles of printing modes available colors printing is also possible some models of inkjet printer can produce multiple copies of printing also.
ADVANTAGES:-
1.High quality printing.
2.More reliable.
3.PROJECTOR<<- An out put device that can take the display of a computer screen and project a large version of it into a flat surface projectors are often used in meeting and presentations to help make sure everyone in the room can view the presentation.
in the picture to the right, is a view sonic projector and a example of what a projector may look like projector of what a projector my look like projector used with computer are small devices that are rarely much larges that a toaster and typically weight a few pound.
Types of projector:-
Cathode Ray Tube :- A CRT projector, which stands for Cathode Ray Tube device projector, is a video projector that employs a cathode ray tube (which is compact and brilliant) as the picture-producing element. A lens is held in front of the CRT face, focusing and enlarging the picture onto a screen. Color CRT projectors initially appeared on the market in the early 1950s. Instead of a single-color CRT, most current CRT projectors use three colors – red, blue, and green. Combining these three colors helps form images on the screen in exact dimensions and proportions.
Liquid Crystal Display:-A liquid crystal display device (LCD) projector is connected to a computer, commonly used in business seminars, presentations, and meetings. They use liquid crystals to show pictures, data, or video and are powered by transmissive technology. LCD projectors provide excellent colour reproduction and are less expensive to manufacture, making them more popular than many alternatives. These display panels are found in a wide range of devices, including mobile phones, portable video games, laptop computers, and televisions. LCD technology has a significantly thinner display than CRT technology. Advanced technologies help in better picturisation
Digital Light Processing:-DLP device projectors, one-chip or three-chip, are used for front and rear projection units. One-chip DLP projectors can create over 16 million colours, but three-chip versions can produce over 35 trillion colours, allowing the projector to make more lifelike and natural pictures. It is employed in front projectors in companies and classrooms and rear projection in televisions.
4.SPEAKER<<-A Speaker is a output device that produces sound through an oscillating transducer called a driver. the equivalent input device is a microphone.Speaker are plugged into a computer is sound card via a myriad of interfaces is such as a phone connector for analog audio, or SPDIF for digital audio.
Types of speakers:-
Sub woofers:-Sub woofers create very law-frequency sound with a frequency range of 20 to 200 Hz, The sub woofer is a device speaker that can be pointed in any direction.
Bluetooth speakers(speakers now available as wireless):–A Bluetooth speaker is a type of wireless technology. These are incredibly portable, device allowing you to play them anywhere and at any time. They supply us with high-quality audio. We can connect to any music device,and specific Bluetooth speakers can be plugged into an outlet and used wireless while charging. The most prevalent output device utilized with computer systems is the speaker.
USB Speaker:-These kinds of speakers are now available as wireless speakers.device You must connect a USB to your computer to utilize them. They only function within a specific range and maybe kept anyplace within that range; their voice quality is likewise superb.
Dynamic Speaker:- Dynamic speakers,device which are primarily passive, are pretty prevalent. They are generally found with one or more woofer drivers. They have one or more tweeter drivers and are famous for creating low frequency sound. Professional speakers have rear drivers to help with sound amplification in certain circumstances.
Electrostatic Speaker:-Electrostatic speakers device are an excellent alternative for consumers who want clear,detailed sound. They are plugged into an external power outlet because they require an external power source. In most situations, electrostatic speakers are employed at high frequencies and are not suitable for low-frequency speakers. A lovely outdoor speaker will typically have an output of roughly 80 watts. Look for PC speakers with wattage’s ranging from 10 to 25.
Computer Speaker:-Earlier computers had tiny speakers device that were connected to the motherboard. Later,they began to include a sound card so that users could simply listen to their headphones through the plugin Speakers were not as strong at the time,and only 8-bit or 16-bit sound functioned.Electrostatic speakers are an excellent alternative for consumers who want clear, detailed sound.These can go bad after some time if they are used rigorously. Therefore, it is wise to use detachable speakers that can be repaired easily from time to time.
Conclusion Speaker:-A computer speaker device is a piece of output gear that connects to a computer to produce sound, and as a result, we can listen to the sound like an outcome. External speakers, whether external(speakers that are now available as wireless) or built-in, i.e., attached to a computer, function as transducers,converting the audio into perceptible sound waves. Sub woofers produce very low-frequency sound with a frequency range of 20 to 200 Hz. A Bluetooth speaker is a wireless speaker device that allows you to play music. Dynamic speakers, which are primarily passive, are pretty prevalent.
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