How do we calculate the bit rate of an audio sample?, Bit rate=sampling frequency *bit depth, If we use a bit-depth of 4 in audio sampling, how many unique codes are there?, 16, What do we call a pixel-based image?, Bitmap, What are images called that are based on shapes rather than pixels?, vector, What is metadata?, Information about the file, it is stored in the header., Provide 3 examples of typical metadata., Bit depth; resolution; dimensions, What do we call the number of pixels per unit area?, resolution, An audio signal is sampled at 2kHz with a bit depth of 4, how many kilobytes are needed to store 1 second of the sound?, 1, What unit is the sampling frequency measured in?, Hertz, What unit is bit rate measured in?, Mbps, Why do we compress files?, To reduce storage required, to make the transmission through the internet faster as less bandwidth required., What are the two types of compression?, Lossy, lossless, Provide an advantage of lossy compression., Creates small files, compression factor high., Provide an advantage of lossless compression, The original image can be retrieved so no loss of quality, Explain a technique of lossless compression, Run -length encoding, when the value is only recorded once along with the frequency of occurrence in neighboring values are recorded, Explain a way in which lossy compression could be applied., In a sound file all frequencies above 20kHz could be removed as it is beyond the human range of hearing and is therefore redundant information..

2.6a [Data Representation]

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