What is data
Unprocessed facts and figures that have no meaning
What is information
When data is processed into a computer and then has a meaning
What is a bit
Has a value of 0 or 1 and is the smallest unit of computer storage
What is a nibble
4 bits
What is a byte
8 bits
How many bytes are in a kilobyte,megabyte,gigabyte and terabyte
Kilobyte= 1024 bytes
Megabyte= 1024 kilobytes
Gigabyte= 1024 megabytes
Terabyte= 1024 gigabytes
What are the types of data
Numeric, date/time,character/string
What is numeric data
A whole number with no decimal can be positive or negative
What is a character/string
A character is a single letter or digit
A string is sequence of characters
What is a pixel
Smallest unit of a digital image that can be displayed and edited
What is the quality of an image reference
Image resolution
How many bits are typically used to store a pixel of a jpeg image
24 bits
What are the differences in bitmap and vector based graphics
Bitmap store details of each individual pixel. Vector store information on the components that make the image.
Vector based graphics are based on mathematical objects, bitmaps store every pixel making it a large file
What is streaming
Process that allows videos to be viewed on a website straight away
What is buffer
Computer memory which stores part of the video before watched. Preventing disruption
What factors affect sound quality
Sample rate = audio sound samples captured per second
Bit depth = bits used for each sound sample
Bit rate = number of bits that is processed in a time period
Examples of analogue signals
Sound waves and temperature
How to convert analogue to digital
Use an ADC which will sample a signal. Sample then converted to digital
What is data portability
Transferring data from one computer to another without having to re Enter data
What does jpeg stand for
Joint photographic expert group
What does tiff stand for
Tagged image file format, stores bitmapped images
What does png stand for
Portable network graphics
How to calculate bit rate
But depth x sample rate
What does txt stand for
A plain text document
