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data representation - Coggle Diagram
data representation
Sound
Sound waves are analogue- they continuously change. Computers can only store digital data. To store sound therefore the analogue signal needs converting into digital. This process is completed by using an analogue to digital converter (ADC).
Sample rate is the number of samples per second (Hz)
ADC - Something that converts analogue signals to digital ones
Sample resolution - Number of bits needed to store a sample (bit depth)
Image file sizes
Pixels stands for picture element
Resolution is the number of pixels up x number of pixels across
Colour depth is the number of bits required to store the number of colours
Calculations
To calculate the image file sizes: Resolution (WxD) x Colour depth
To calculate the sound file size: bit depth (bits) x sample rate (Hz) x length (seconds)
Data Sizes
Bit = 1 bit
Nibble = 4 bits
Byte 8 bits
Kilobyte = 1000 bits
Megabyte = 1,000,000 bytes
Gigabyte = 1,000,000,000 bytes
Terabyte = 1,000,000,000,000 bytes
Petabyte = 1,000,000,000,000,000 bytes
Exabyte = 1,000,000,000,000,000,000 bytes
Zettabyte = 1,000,000,000,000,000,000,000 bytes
Yottabyte = 1,000,000,000,000,000,000,000,000 bytes
Hellabyte = 1,000,000,000,000,000,000,000,000,000 bytes
Primary and secondary storage
Memory and storage are split into two different categories, primary and secondary storage
Memory is usually refered to as primary storage
Storage is usually referred to as secondary storage