Flashcards
5 - Data Representation
Flashcards do conjunto (28)
- 1BinaryA number system that uses 1's and 0's
- 2BitA binary digit, it can be a 1 or 0
- 3ByteA group of 8 bits
- 4WordA group of bytes
- 5DenaryA number system that uses the digits 0 to 9
- 6Two's complementA system for representing negative numbers
- 7HexadecimalA number system that uses the digits 0 to 9 and A to F
0123456789ABCDEF - 8PixelThe smallest accessible area or smallest solid block of colour in an image
- 9BitmapCreated when the pixels of an image are mapped to positions in memory that store binary codes representing the colour of each pixel
- 10ResolutionA quantity expressed as the number of dots/pixels per inch or cm
- 11Colour depthThe number of bits used to represent the colour of a single pixel in a bitmapped image
- 12Vector graphicRecords geometric and other information about the objects that make up an image
- 13ObjectA component of a vector graphic, such as a line, a rectangle or a circle
- 14Drawing listThe list of drawing commands that recreate a vector graphic
- 15PropertyOf a vector graphic object, describes things such as the size, direction, thickness, shading, font size or typeface
- 16Data compressionSqueezes data into a smaller number of bytes than the data would occupy if uncompressed
- 17Analogue dataData that varies in a continuous manner
- 18Digital dataData that takes the form of discrete values
- 19Analogue signalAn electrical signal that varies in a continuous manner
- 20Digital signalAn electrical signal with voltage changes that are abrupt or in discrete steps
- 21ADCAnalogue-to-digital converter
Converts an analogue signal to an equivalent digital signal - 22DACDigital-to-analogue converter
Converts a digital signal into an equivalent analogue signal - 23PCMPulse code modulation
A process for coding sampled analogue signals by recording the height of each sample in binary electrical equivalent - 24PAMPulse amplitude modulation
A process that samples analogue signals at regular time intervals and produces electrical pulses of height proportional to the original signal's amplitude at the instant of sampling - 25Quantisation noiseThe difference between the original amplitude and its sampled value
- 26Nyquist's theoremSample at a frequency at least twice the rate of the highest frequency in the sampled signal
- 27MIDIMusical Information Digital Interface
A way of representing the sounds made by an instrument - 28Synthesize soundUse digital means to generate audio signals resembling instrument sounds or the human voice
Informações
- Descrição
- A level Computing (Comp 1) FlashCards sobre 5 - Data Representation, criado por Tom Gillmore em 21-05-2015.
- Criado por
- Tom Gillmore
- Visualizações
- 8
- Avaliação