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How computers store sound, images and text

Source-bbc bitesize

Sound

Image

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The computer saves the sounds created as digital information know as an audio file.

  • First the microphone records the change in the surrounding air pressure
  • The microphone converts the air pressure into electrical voltage
  • An Analogue to Digital converter then converts the sound it a digital form that can be processed by a computer.
  • The computer now finally displays the digital information so the user can edit and save
  • The sounds are saved under as an audio file.

Each colour of an image is stored as binary number. You need a binary value for each different colour. Graphics on a screen are made up of tiny blocks called pixels. The more pixels on the screen, the higher the resolution and the better the quality of the picture will be. The higher the image resolution, the more memory is needed to store the graphic.

Text

When somebody types a letter, it is converted into binary. For example, the letter ‘a’ has the binary number 0110 0001. This is converted onto ASCII code, however this can only same 128 characters which is enough for English but not other languages which use something called unicode.

Introduction

Computers use a language called binary. This is a series of on's and off's, represented in 1's and 0's.

Computers can represent certain data types, for example sound, images and text using this language, which is what this presentation is about.

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