Computer Science

a binary digit, the basic unit of data within a computer system that has the value 0 or 1

a word used in front of a number to represent a multiple of that number

Measurements of storage

The need for compression

Lossy and lossless compression

Compression ratios

Run length encoding

Huffman coding

Comparing compression algorithms

Practical applications of compression

In this unit pupils will be introduced to the concept of data compression and why it is needed. The will compare lossy and lossless compression methods and their typical uses. They will have the opportunity to compression methods such as run length encoding (RLE) and Huffman coding.

Data compression

What does a number prefix represent in computing?

Arrange the storage units in order of increasing size.

What does a kilobyte represent in computing?

A sound file lasts 2 minutes, has a sample rate of 44100 Hz, a bit depth of 16 bits and is recorded in stereo. Calculate the file size in megabytes (MB).

What is the purpose of knowing file sizes?

information stored and processed by computers

What does the term 'data' refer to in computing?

What is the smallest unit of data in computing?

Measurements of storage

Lesson outcome