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CIS750 – Seminar in Advanced Topics in Computer Science Advanced topics in databases – ... - page 10 / 30

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Adaptive Differential Pulse Code Modulation (ADPCM)

One observation is that a small difference between samples happens more often than large changes

An Entropy coding method such the Huffman coding scheme can be used to encode the difference for additional efficiency

The probabilities of occurrence of different differences are first obtained using a large data base

Huffman coding is used to determine the codeword for each difference

The codeword is fixed and made available to decoders

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