What is data representation? represent text & represent Numbers & represent Images& represent Audio ...

 

What is data representation?

Data Representation : 

How is data represented in the computer?

Information today comes in different forms such as text, numbers, images, audio, and video. 

What is a type in data structure?
1__Text :

How do you represent text on a keyboard?

• In data communications text is represented as a bit pattern, a sequence of bits (0s or 1s).
• Different sets of bit patterns have been designed to represent text symbols.
• Each set is called a code .
•  and the process of representing symbols is called coding.
• Today, the prevalent coding system is called Unicode, which uses 32 bits to represent a symbol or character used in any language in the world.
•  The American Standard Code for Information Interchange (ASCII) ,developed some decades ago in the United States,
•  now constitutes the first 127 characters in Unicode and is also referred to as Basic Latin.

What is Code ?
What is Coding ?
What is Uncode ?
What is American Standard Code for Information Interchange (ASCII) ?
What is Basic Latin ?

2__Numbers :

How do you represent Numbers ?

• Numbers are also represented by bit patterns. However, a code such as ASCII is not used
• to represent numbers; the number is directly converted to a binary number to simplify
• mathematical operations.

2__Images: 

How do you represent Images ?

• Images are also represented by bit patterns.
•  In its simplest form, an image is composed of a matrix of pixels (picture elements).
• where each pixel is a small dot.
•  The size of the pixel depends on the resolution.

NOTE:

For example, an image can be divided into 1000 pixels or 10,000 pixels. In the second case, there is a better representation of the image (better resolution), but more memory is needed to store the image. 
After an image is divided into pixels, each pixel is assigned a bit pattern.
The size and the value of the pattern depend on the image.

3__Audio :

How do you represent Audio ?

• Audio refers to the recording or broadcasting of sound or music.
• Audio is by nature different from text, numbers, or images.
• It is continuous, not discrete.
• Even when we use a microphone to change voice or music to an electric signal, we create a continuous signal.

4__Video :

How do you represent Video ?

• Video refers to the recording or broadcasting of a picture or movie.
• Video can either be produced as a continuous entity (e.g., by a TV camera), or it can be a combination of images .
• each a discrete entity, arranged to convey the idea of motion.

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