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CIS750 – Seminar in Advanced Topics in Computer Science Advanced topics in databases – ... - page 9 / 30

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Differential Pulse Code Modulation (DPCM)

Encode the changes between consecutive samples

Example

The value of the differences between samples are much smaller than those of the original samples. Less bits are used to encode the signal (e.g., 7 bits instead of 8 bits)

For decoding the difference is added to the previous sample to obtain the value of the current sample. Lossless coding is achieved

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