Chapter 7: Input and Output

Chapter 7

INPUT AND OUTPUT

Group: Sell Me this pen

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What is input?

What is output?

What is input?

Input is any data and instructions entered into the memory of a computer.

Commonly used input methods include:

Pointing devices

Keyboard

Touch screens

Pen input

Motion input

Voice input

Scanners and reading devices

Video input

Keyboards

A keyboard is an input device that contains keys users press to enter data and instructions into a computer or mobile device.

Most desktop computer keyboards have…

Function keys

Typing area

Navigation keys

Toggle key

Keyboard shortcut keys

Media control buttons

Internet control buttons

• An ergonomic keyboard has a design that reduces the chance of repetitive strain injuries of wrist and hand.
• Ergonomics incorporates comfort, efficiency, and safety in the design of the workplace.

Pointing Devices

A pointer is a small symbol on the screen whose location and shape change as a user moves a pointing device.

A mouse is a pointing device that fits under the palm of your hand comfortably Optical mouse, laser mouse, and touch mouse.

Touch Screen

A touch screen is a touch-sensitive display.

Pen Input

With pen input, you touch a stylus or digital pen on a flat surface to write, draw, or make selections.

A graphics tablet, also called a digitizer, is an electronic plastic board that detects and converts movements of a style or digital pen into signals that are sent to the computer.

Motion, Voice, and Video Input

• With motion input, sometimes called gesture recognition, users can guide on-screen elements using air gestures.
• Voice input is the process of entering input by speaking into a microphone.
• Voice recognition, also called speech recognition, is the computer or mobile device’s capability of distinguishing spoken words.
• Audio input is the process of entering any sound into the computer such as speech, music, and sound effects Music production software allows users to record, compose, mix, and edit music and sounds.

Video input is the process of capturing full-motion images and storing them on a computer or mobile device’s storage medium.

A webcam is a type of DV camera that enables a user to:

• Capture video and still images.
• Send email messages with video attachments.
• Broadcast live images or video over the Internet.
• Conduct videoconferences.
• Make video calls.

A videoconference is a meeting between two or more geographically separated people.

Scanners and Reading Devices

• A scanner is a light-sensing input device that reads printed text and graphics and then translates the results into a form the computer can process.
• A flatbed scanner works in a manner similar to a copy machine except it creates a file of the document in memory instead of a paper copy.

An optical reader is a device that uses a light source to read characters, marks, and codes and then converts them into digital data that a computer can process Optical character recognition (OCR) Optical mark recognition (OMR).

• A bar code reader, also called a bar code scanner uses laser beams to read bar codes.
• A QR code stores information in both a vertical and horizontal direction.

• RFID (radio frequency identification) uses radio signals to communicate with a tag placed in or attached to an object.
• An RFID reader reads information on the tag via radio waves.

RFID can track:

• Tracking times of runners in a marathon.
• Tracking location of people and other items.
• Checking lift tickets of skiers.
• Managing inventory.
• Gauging temperature and pressure of tires on a vehicle.
• Checking out library books.
• Providing access to rooms or buildings.
• Managing purchases.
• Tracking payment as vehicles pass through booths on tollway systems

Magstripe readers read the magnetic stripe on the back of cards such as:

• MICR (magnetic ink character recognition) devices read text printed with magnetized ink.
• An MICR reader converts MICR characters into a form the computer can process.
• Banking industry uses MICR for check processing.

A data collection device obtains data directly at the location where the transaction or event takes place.

What is output?

Output is data that has been processed into a useful form.

Commonly used output methods include:

Displays

Printers

Displays

• A display visually conveys text, graphics, and video information.
• A monitor is a display that is packaged as a separate peripheral device
• LCD monitor

The quality of a display depends primarily on its:

Response time

Resolution

Brightness

Contrast ratio

Dot pitch

• Today’s monitors use a digital signal to produce a picture.
• To display the highest quality images, the monitor should plug into:

A DVI port An HDMI port A DisplayPort

• Home users sometimes use a digital television (DTV) as a display.
• HDTV is the most advanced form of digital television.
• A Smart TV is an Internet-enabled HDTV.

Printers

• A printer produces text and graphics on a physical medium.
• A nonimpact printer forms characters and graphics on a piece of paper without actually contacting the paper.

• An ink-jet printer forms characters and graphics by spraying tiny drops of liquid ink onto a piece of paper.
• Color or black-and-white.
• Speed is measured by the number of pages per minute (ppm) it can print.

A photo printer produces lab-quality photos.

• Many use ink-jet technology.
• PictBridge allows you to print photos directly from a digital camera.
• Print from a memory card.

An all-in-one printer is a single device that prints, scans, copies, and in some cases, faxes Also called a multifunction printer.

A 3-D printer uses a process called additive manufacturing to create an object by adding material to a three-dimensional object, one horizontal layer at a time.

A thermal printer generates images by pushing electrically heated pins against the heat-sensitive paper.

A mobile printer is a small, lightweight, battery-powered printer that allows a mobile user to print from a mobile device.

A label printer is a small printer that prints on an adhesive-type material that can be placed on a variety of items.

• Plotters are used to produce high-quality drawings.
• Large-format printers create photo-realistic quality color prints.

Impact printers form characters and graphics on a piece of paper by striking a mechanism against an inked ribbon that physically contacts the paper.

Other Output Devices

Many users attach surround sound speakers or speaker systems to their computers, game consoles, and mobile devices to generate higher-quality sounds

• Headphones are speakers that cover or are placed outside of the ear.
• Earbuds (also called earphones) rest inside the ear canal.

• A data projector is a device that projects the text and images displaying on a computer or mobile device screen on a larger screen so that an audience can see the image clearly.
• An interactive whiteboard is a touch-sensitive device, resembling a dry-erase board, that displays the image on a connected computer screen.

• Joysticks, wheels, gamepads, and motion-sensing game controllers can be considered output devices when they include force feedback
• Technology that sends resistance to the device in response to actions of the user

Thanks!

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