Topic 1 Revision

3. a method of checking the output from a logic circuit
6. abbreviation for binary digit.
7. coding system for all the characters on a keyboard and control codes.
9. base two number system based on the values 0 and 1 only.
12. number of bits used to represent the colours in a pixel, e.g. 8 bit colour depth can represent 28 = 256 colours
13. formed from a combination of logic gates and designed to carry out a particular task. The output from a logic circuit will be 0 or 1.
16. number of bits used to represent sound amplitude (also known as bit depth).
17. coding system which represents all the languages of the world (first 128 characters are the same as ASCII code).
18. number system that uses 4 bits to represent each denary digit.

1. a number system based on the value 16 (uses the denary digits 0 to 9 and the letters A to F).
2. graphics images that use 2D points to describe lines and curves and their properties that are grouped to form geometric shapes.
4. number of pixels that make up an image, for example, an image could contain 4096 × 3192 pixels (12 738 656 pixels in total).
5. contents of a computer memory output to screen or printer.
8. number of sound samples taken per second.
10. this gate is the only logic gate with one input
11. electronic circuits which rely on ‘on/off’ logic. The most common ones are NOT, AND, OR, NAND, NOR and XOR.
14. image system that uses pixels to make up an image.
15. smallest picture element that makes up an image.