Analogue data - data represented in a physical way, Sound waves - an example of analogue data, Computers can only represent data - as a combination of 1 or 0 numbers, Sampling - is where hardware measures the level of sound many times per second , Sampling frequency - The number of times that the sound level is sampled per second, Audio files are compressed, - data is removed to reduce the size, Example of analogue device - Clock or watch, or sundial, An analogue-to-digital (A/D) converter - converts continuous signals into discrete digital numbers, An example of A-D conversion - Audio sampling for the purpose of storing it on a computer, Raster graphics - Are matrix data structures representing a grid of pixels, A bitmap image - A type of raster image and is composed of many tiny parts, called pixels, Vector graphics - A set of instructions for drawing a geometric shape, Compression - is the process of making a file size smaller, Lossless compression - algorithm that compresses data and decompressed at a later time without any loss of data, Lossy compression - is a technique that compresses the file size by discarding some of the data, Nybble - 4 bits, Byte - 8 bits, Kilobyte - 1024 bytes, Secondary storage - is also known as back-up storage, Optical storage media - uses technology such as lasers,

Digital Technology - Topic 1 Data Definitions

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