Computer Systems

the calculation goes over the amount of bits the computer can deal with

A way of representing information using only two options.

easier to read as a human

American Standard Code for Information Interchange

8 bit which can code for all foreign characters

can fit all language characters and more

the number of available colours is 2^(n)

Image size (area) x colour depth

converting analog sound to digital sound

the number of samples taken per second

how many bits is used

Sample rate x Bit depth x Time running (seconds)

reducing file size

Losses bits of data by using abstraction and then filling in with what it predicts

No data is lost. Repeats recurring information

A tree having the nodes representing symbols as the leaves, with more frequent symbols having nodes progressively closer to the root. The most frequent symbols are the closest to the root node. Note that internal nodes cannot represent symbols. The edges connecting children to parents are either 0 or 1. Convention must be established (e.g., left children have 0s, right children have 1s). The code for a symbol is built from 0s and 1s along the path from the root down to the desired symbol. Codes must be prefix free. abc:7 / \ ab:3 c:4 / \ a:1 b:2

wbbw becomes 1w2b1w

System that manages the operation of the computer (controls hardware)

Coded for 1 purpose (washing machine)

Where data processing takes place

Data fetches information, decodes it and then executes task

controls operations of the CPU’s internal components

These transfers data to and from the CPU

Controls whether the busses are occupied