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## Ignore words

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alphanumeric

The collective name for letters, digits and symbols.

analogue signal

A continuous signal which can't be processed by a computer.

AND logic gate

A logic gate with two inputs. The output will be on if both of the inputs are on. If either is off, the output will be off.

ASCII

A 7-bit character set consisting of 128 characters (8th bit is used as parity bit).

binary

A counting system using base-2 consisting of Os and 1s.

binary addition

The process of adding two binary numbers together. The rules for each digit: 1 + 1 = 0 with carry; 1 + 0 = 1 with no carry; 0 + 1 = 1 with no carry; 0 + 0 = 0 with no carry, 1 + 1 + carry = 1 with carry.

binary converting to/from denary

The process of converting binary numbers to or from decimal (Base 10).

binary converting to/from hexadecimal

The process of converting binary numbers to or from hexadecimal (Base 16).

binary overflow

When the binary number resulting from some arithmetic is to large for the available space, the overflow or carry flag is set.

binary shift

Moving the bits in a binary number left or right and filling the gaps with Os.

bit

A binary digit, either O or 1.

bit rate

The number of bits used per second of sampled audio.

bitmap image

A graphic that is made up of pixels.

Boolean logic gates

Logic circuits are special circuits built into computer chips. They receive binary data, apply Boolean operations and output binary results.

byte

8 bits.

character

A single alphanumeric symbol.

character set

A group of characters that a computer recognises from their binary representation.

check digit

A digit added to a string of digits which is used to check if all the digits have been entered and read correctly.

colour depth

The number of bits used for each pixel in an image file.

compression

The process of making the size of a file smaller.

denary

A number system using base-10. Also known as decimal.

denary converting to/from binary

The process of converting decimal numbers to or from binary (Base 2).

denary converting to/from hexadecimal

The process of converting decimal numbers to or from hexadecimal (Base 16).

digital signal

The representation of an analogue signal using binary data.

distinguished

With a monocle.

dpi

dots per inch

extended ASCII

An 8-bit character set consisting of 256 characters.

gigabyte

1000 megabytes.

hexadecimal

A counting system using base-16 consisting of the digits 0-9 and the letters A-F.

hexadecimal converting to/from binary

The process of converting hexadecimal numbers to or from binary (Base 2).

hexadecimal converting to/from denary

The process of converting hexadecimal numbers to or from decimal (Base 10).

images

Pictures stored within a computer.

kilobyte

1000 bytes.

logic circuit

An electronic circuit for performing logic operations on binary data. It may have more than one logic gate and more than two inputs.

logic gate

An electronic circuit component that performs a Boolean operation (e.g. AND, OR or NOT).

lossless compression

Temporarily removing data from a file to decrease the file size.

lossy compression

Permanently removing data from the file to decrease the file size.

megabyte

1000 kilobytes.

metadata

Extra data stored in a file which gives information about the file's properties.

nibble

4 bits.

NOT logic gate

A logic gate with one input. The output will be on if the input is off. If the input is on, the output will be off. Also known as an invertor.

NOT operator

One of the Boolean operators.

OR logic gate

A logic gate with two inputs. The output will be on if either, or both, of the inputs are on. If either both are off, the output will be off.

overflow error

An error that occurs when the computer attempts to process a number that has too many bits for it to handle.

parity bit

A bit placed at the end of binary data to show if it's been received correctly.

petabyte

1000 terabytes.

pixels

Small dots that make up a bitmap image.

resolution

The density of pixels in an image, often measured in dpi (dots per inch).

sample size

The number of bits available for each audio sample.

sampling

The process of converting analogue signals to digital data.

sampling frequency

The number of audio samples that are taken per second.

sampling intervals

The time between each sample.

sound

Noises stored within a computer

terabyte

1000 gigabytes.

truth table

A table listing all possible binary inputs through a logic circuit, with the corresponding outputs.

Unicode

A large character set that attempts to include all possible characters.

units (of data)

A standard set of measurements to cover the size of items stored in memory