Notes on input and output devices of computer pdf
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- Computer Basics: What Is an Output Device? 10 Examples
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- Output Devices
- Lesson 5: Input and Output
Output Device can produce the final product of machine processing into a form usable by humans. It provides man to machine communication. Keyboard is most common input device is used today. The data and instructions are input by typing on the keyboard.
Computer Basics: What Is an Output Device? 10 Examples
Paul's passion for technology and digital media goes back over 30 years. Born in the UK, he now lives in the US. Read on for 10 examples and the definition of an "output device. An output device is a piece of computer hardware that receives data from a computer and then translates that data into another form. That form may be audio, visual, textual, or hard copy such as a printed document. The key distinction between an input device and an output device is that an input device sends data to the computer, whereas an output device receives data from the computer.
For example, using a microphone to record a podcast is an example of using an input device. Listening to the recorded podcast through a connected speaker is an example of using an output device. Both output and input devices are examples of auxiliary or peripheral devices. There are four different categories of output device: visual, data, print, and sound. Each output device example has a specific history, so here I cover specifically how each device works, when it became a part of technology history, popular brands on the market selling the device, and a fun fact.
For more information about input devices, check out my article " Computer Basics: 10 Examples of Input Devices. Function: A monitor consists of a screen, circuitry, a power supply, buttons to adjust screen settings, and a casing that contains all of these components. A monitor displays data from a computer onto a screen so the user can interact with the data via a digital interface.
Origin Story: The first monitors used the same technology as early televisions, relying on a cathode ray tube and a fluorescent screen. This technology was first utilized for computer monitors in in the Uniscope machine , which had a built-in CRT display. CRT display lights up a series of dots with a beam on an active part of the screen.
This resulted in a maximum resolution of by pixels. Nowadays, monitors incorporate flat display technology. Plasma monitors are brighter than both CRT and LCD and function by illuminating tiny charged gas bubbles, or plasma, in the screen.
A computer sends data to a printer, which is then output by printing data onto paper or into a 3-dimensional item. Function: The function of a printer is to create a copy of whatever is sent from the computer to the printer. Printers take electronic data sent from a computer and generate a hard copy. Origin Story: Photocopying, also known as xerography, is the origin-technology of modern-day printing and was invented in by Chester S. Carlson of Queens, New York. The first inkjet printer was developed in There are many different types of printers, with inkjet and laser printers being two of the most common.
Fun Fact: A plotter, which is also a type of print output device, is a similar type of hardware device to a printer. Unlike a printer, however, plotters use writing tools, such as pen, pencil, marker, to draw lines. Designed to use vector graphics, plotters were once commonly employed for computer-aided design, but have now been largely replaced by wide-format printers. Function: Headphones output audio from a computer through two individual headphones for a single listener. Also known as earphones, headphones allow you to listen to audio without disrupting other people in the vicinity.
Nathaniel Baldwin of Utah submitted a headphone prototype to the U. Navy in , which was adopted some years after by Naval radio operators.
Koss Corporation then created the first commercial stereo headphones in Nowadays, headphones come in all shapes and sizes, from basic earbuds to the traditional style with padding around the earpieces and a connecting band that fits over the user's head.
Fun Fact: Headphones were popularized for mainstream use in by Sony Walkman. Speakers receive vibrational cues from a computer and elicit sound. Function: Computer speakers are hardware devices that transform the signal from the computer's sound card into audio. Speakers create sound using internal amplifiers that vibrate at different frequencies according to data from the computer. This produces sound. Origin Story: Speakers are essential if you want a louder sound, surround sound, fuller bass, or just higher quality audio.
The first internal computer speaker a speaker inside the chassis of a laptop was created in by IBM. External computer speakers began to appear in stores in the early s when computer gaming, digital music, and other forms of media became popular.
Some computer speakers are wireless nowadays, connecting to the computer via Bluetooth. Fun Fact: You can turn your speakers or headphones! The difference between computer speakers and a microphone is that the frequency of the vibration originates from external sounds rather than data from a computer.
Function: As its name suggests, this output device "projects" computer images or video onto a wall or screen. Projectors were first created and used in late 19th-century France. Throughout history, biunial lanterns were used to project ink on glass by photographers, lecturers, and magicians. A biunial lantern is a lantern with projection capabilities.
Turning the knob allowed teachers to stop on specific slides. The data projector was invented in Using a single cathode ray tube CRT , the first data projector projected only monochromatically. Nowadays, projectors are typically used for presentations, watching movies, or as a teaching aid, as they enable an entire roomful of people to see images generated by a single computer. Fun Fact: 3D projectors are designed to project two images of the same thing from different angles at the same time.
Wearing 3D glasses, the viewer can see a 3D projection composed of multiple superimposed images. The sender broadcasts signals to 24 satellites that ping to the sender the exact location of the sender computer in the form of latitude and longitude coordinates. The Department of Defense deployed more satellites to bolster the burgeoning navigation system. By , 24 satellites were in orbit and GPS was used broadly across the world in agriculture, aviation, the military, athletics, science, and the list goes on.
A computer sends data to the sound card, which then translates the data into vibrational patterns. These patterns are output by speakers as sound. Function: The sound card controls the output of sound signals, enabling devices like speakers and headphones to work. The sound card is known as an expansion card, which means it can be added to the motherboard. Although a sound card is not essential to a computer's basic functionality, you need one if you wish to play games, watch movies, listen to music, and use audio and video conferencing.
PLATO was the first computer-assisted learning system in widespread use. It wasn't until that sound cards were widely used in PCs. When computer data is sent through a sound card, it is sent to the card digitally. The sound card then translates the digital information in the form of binary, or 0s and 1s into analog information: vibrations, output in the form of sound.
Fun Fact: The popularization of sound cards originated in the gaming realm. Sierra Entertainment, a gaming platform, began supporting add-ons like sound cards and this enabled the sound card industry to grow without being an underground solution to a growing issue: shallow sound while gaming.
A video card can greatly improve a computer user's gaming experience. Function: As with the sound card, the video card is an expansion card that slots into the motherboard. The video card processes images and video, enabling visuals to be seen on a display.
Most computers have basic video and graphics capabilities built into the computer's motherboard, but for faster, more detailed graphics, a video card is required. The MDA supported visuals such as text and lines for uses such as drafting but didn't offer any graphical experiences. In order to increase the functionality of the burgeoning computing technology, Hercules Computer Technology invented the Hercules Graphics Card, which integrated with the MDA to offer a bitmapped or "rasterized," or pixelated , graphics experience.
From the s on, graphics technology was increasingly like modern-day graphics cards and has increased in graphic quality and speed significantly since then. Fun Fact: Video cards can work in both 2D images and 3D images. Images like browsers, computer desktops, and PDFs are considered 2D images, whereas computer games are considered 3D.
A braille reader uses the kinetic nature of the piezoelectric-driven keyboard to send braille letters in the form of raised bumps to the user. Function: A braille reader is a peripheral device that enables a blind person to read text displayed on a computer monitor. The text is sent by the computer to the device, where it is translated into a braille format and made readable by pushing rounded pins up through a flat surface. Braille readers are also called braille displays and come in various sizes.
Braille readers come in the form of separate devices from a keyboard or as part of a keyboard. Most use piezoelectric technology, or electricity generated by mechanical stress, to create a single line of text at a time in the form of raised bumps.
This was the case until late when Blitlab proposed an electronic solution to the limited capabilities of braille readers. Blitlab, upon its release, will allow the visually impaired to use the internet and read books and newspapers more independently.
The technology is still in development. Origin Story: Braille is a 63 character alphabet invented in by Louis Braille. Braille was embossed on paper and other materials for decades before braille reader technology was invented. Fun Fact : Blitlab is the first tablet-style braille reader technology that will utilize a perforated glass screen that raises bumps as the computer reads the text from websites and translates it to braille. Function: SGDs, also known as voice output communication aids, generate text to speech.
A user types something and when the command is sent, the SGD reads the sentence out loud. In the s Dynavox was formed by students from Carnegie Mellon University with the goal to make an effective SGD for a young woman with cerebral palsy. This resulted in the invention of the EyeTyper, a device that allowed the user to spell with their eyes that would then be spoken.
This often includes the ability to speak. The variety and complexity of output devices evolve with technology. Conceptually output devices have existed for decades.
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In this lesson students consider a number of computing devices to determine what types of inputs and outputs they use. Groups are assigned to a computing device and based on a teacher-provided definition of input and output, list the inputs and outputs of their device. Earlier in the activity students are prompted to focus on more obvious physical inputs and outputs e. Throughout the lesson the teacher records inputs and outputs that are identified on a T-Chart at the front of the room. To conclude the lesson students examine common activities they do on a computing device and select the inputs and outputs used for that activity from the chart. In the previous lesson students were introduced to the input, output, store, and process model of a computer. Since this model of a computer is still fairly abstract, this lesson grounds it in the ways a computer actually input and output information.
Get top class preparation for UGC right from your home: Get detailed illustrated notes covering entire syllabus : point-by-point for high retention. A Computer is a General-purpose machine, commonly, accepts inputs , stores, manipulates, and generates outputs data as numbers, text, graphics, voice, video files, or electrical signals, in accordance with instructions called a program. This design is still used in most computers produced today. Mauchly at the University of Pennsylvania. Hardware — Computer hardware are the physical parts of computer, such as the monitor, keyboard, and mouse.
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Choose the correct option and mark your choice against the corresponding question number in the given answer sheet by darkening the corresponding circle with a lead pencil. Now they are also used with nonportable desktop computer systems because they occupy less table space. Non-impact printers.
Lesson 5: Input and Output
The devices are usually used for display, projection, or for physical reproduction. Monitors and printers are two of the most commonly-known output devices used with a computer. A computer can still function without an output device. There is no indicator of errors, nor of the need for additional input. It creates a visual display by the use of which users can view processed data. Monitors come in various sizes and resolutions. Printer — this device generates a hard copy version of processed data, like documents and photographs.
An output device is any piece of computer hardware equipment which converts information into human read able form. It can be text , graphics , tactile , audio , and video. A new type of Output device is being developed these days, known as Speech synthesizer ,  a mechanism attached to the computer which produces verbal output sounding almost like human speeches. A display device is the most common form of output device.
Input Devices How to tell it what to do : This unit makes link between user and computer. The input devices translate the information into the form understandable by computer. Output Devices: How it shows you what it is doing Output devices translate the computer's output into the form understandable by users. It forms images from tiny dots, called pixels that are arranged in a rectangular form. The sharpness of the image depends upon the number of pixels.
Input/Output devices are required for users to communicate with the computer. In simple terms, input devices bring information INTO the computer and output.
What Is an Output Device?
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