Chapter 2-2

After a computer has processed data, it provides the results in the form of output. There are four types of output: text, graphics, video, and audio.

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What is Output?

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Characters such as letters, symbols, and numbers are called text. To be considered text, the characters must be organized in a coherent way.

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Text

Drawings, photographs, and other visual images are called graphics.

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Graphics

Moving images are known as video. Images captured by a digital video camera, and which can be played on a computer, are one example.

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​Video

Sound output is called audio. This includes music or speech that the computer plays through its speakers or headphones.

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Audio

An output device is any piece of hardware that displays or plays back the result of computer processing.​

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​What is an Output Device?

A hardware device that receives and shows images on a screen.

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Cathode Ray Tube (CRT) - receives electrical signals from the computer

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Monitors

A hardware device that receives and shows images on a screen.

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Cathode Ray Tube (CRT) - receives electrical signals from the computer; are heavy and take up a lot of space

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Liquid Crystal Display (LCD) - ​lighter and use less power than CRTs

Makes a paper copy of the display shown on a monitor.

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Impact Printer - receives signals from the computer that cause hammers or pins to press a ribbon covered in ink; can be noisy; the quality of the image is poor compared to nonimpact printers

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Nonimpact Printer - ​such as inkjet and laser printers; use of ink and lasers to produce the image on the paper