Unit 1: Information Representation

1.1 Data Representation

1 Show understanding of binary magnitudes and the difference between binary prefixes and decimal prefixes

2 Show understanding of different number systems

3 Perform binary addition and subtraction

4 Describe practical applications where Binary Coded Decimal (BCD) and Hexadecimal are used

5 Show understanding of and be able to represent character data in its internal binary form, depending on the character set used

1.2 Multimedia

Graphics

1 Show understanding of how data for a bitmapped image are encoded

2 Perform calculations to estimate the file size for a bitmap image

3 Show understanding of the effects of changing elements of a bitmap image on the image quality and file size

4 Show understanding of how data for a vector graphic are encoded

5 Justify the use of a bitmap image or a vector graphic for a given task

Sound

Show understanding of how sound is represented and encoded

Show understanding of the impact of changing the sampling rate and resolution

1.3 Compression

Show understanding of the need for and examples of the use of compression

Show understanding of lossy and lossless compression and justify the use of a method in a given situation

Show understanding of how a text file, bitmap image, vector graphic and sound file can be compressed