Computer Science

value of data at a specific point in time

a record of characters matched to a unique binary sequence

a character set that represents each character with a unique numerical value

a method of character representation that uses up to 32 bits per character

Representing text using ASCII and Unicode

Representation using binary sequences

Text file size calculation

Representing bitmap images

Bitmap file size calculation

Representation of sound

Calculation of sound file sizes

Metadata

In this unit, pupils will discover how letters, images and sounds are represented with binary digits. They will also explore the factors that impact the quality of those representations and investigate the effects these quality choices have on file size.

Representation of text, images and sound

a method of character representation using 8 bits

a method of character representation using up to 32 bits

a record of characters, each matched to a unique binary sequence

Match the following terms to their definitions.

How many different values can be represented by a 3-bit binary number?

If the ASCII value of 'A' is 65 in decimal, what is the ASCII value of 'C' in decimal?

to support other symbols beyond written text

Why might we need more than just ASCII for character representation?

Unicode uses more bits for character representation.

The first 256 characters of Unicode are the same as in ASCII.

Unicode does not include any ASCII characters.

What is the relationship between ASCII and Unicode?

What is the smallest unit of data in a computer?

Arrange the following in order of increasing bits:

to represent all data and instructions that computers process

What is the purpose of binary sequences in computers?

What is the next binary number after 111?

What is the binary equivalent of the decimal number 10?

Representing text using ASCII and Unicode

Lesson outcome