In this topic you will learn about:
- bit, nibble, byte, kilobyte, megabyte, gigabyte, terabyte, petabyte
- how data needs to be converted into a binary format to be processed by a computer.
- how to convert positive denary whole numbers (0–255) into 8 bit binary numbers and vice versa
- how to add two 8 bit binary integers and explain overflow errors which may occur binary shifts
- how to convert positive denary whole numbers (0–255) into 2 digit hexadecimal numbers and vice versa
- how to convert from binary to hexadecimal equivalents and vice versa
- check digits.
- the use of binary codes to represent characters
- the term ‘character-set’
- the relationship between the number of bits per character in a character set and the number of
- characters which can be represented (for example ASCII, extended ASCII and Unicode).
- how an image is represented as a series of pixels represented in binary
- metadata included in the file
- the effect of colour depth and resolution on the size of an image file.
- how sound can be sampled and stored in digital form
- how sampling intervals and other factors affect the size of a sound file and the quality of its playback: sample size, bit rate, sampling frequency.
- need for compression
- types of compression: lossy an lossless.