Data Representation

Bit, nibble, byte, kilobyte, megabyte, gigabyte, terabyte, petabyte FROM BYTE THEY ALL GO UP IN 1000

0+0=0 1+0=1 1+1=0 carry the 1 1+1+1=1 carry the 1

-simpler to remember -quicker to write or type -less likely to make an error -easy to convert between hex and binary

When the result of an addition is too large for the number of bits the computer works with.

A set of letters, symbols and digits that can be represented by a computer

American standard code for information interchange. 128 characters into 7 bit binary codes

To represent other characters for other languages, 16 bits, 65536 possible combinations

-JPG, joint photographic experts group -BMP, bitmap, uncompressed -GIF, graphics interchange format -TIFF, tag image file format -PNG, portable networks graphics, loddless compression

The smallest identifiable area of an image

The concentration of pixels within a specific area

More bits per pixel = more colour combinations

The number of colours that can be represented. Each pixel can represent a finite number of colours, a pixel is attributed a number of n bits. The number of combinations (2 to the n) dictates the bit depth

Colours depth = bit depth

Data about data, e.g. author, date created, dimensions

Bitmap images are made up of PICture ELement or pixels

Bitmap images are made up of PICture ELement or pixels

Continuous

Discrete, repeatedly measuring and recording the sound wave

Sounds must be converted into a digital form in order to be stored and processed by a computer

Analogue to digital converter

digital signals to outputs

Sound sample is a measurement of a sound wave at a given time

Frequency or sample rate per second affects the level of detail in the digital representation. Number of samples per second

Sample rate x bit depth x duration