What is differential encoding?

Give some detail about differential encoding?
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"In differential encoding, the signal is decoded by comparing the polarity of adjacent signal elements rather than determining the absolute value of a signal element."
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"Straightforward demonstration of transform code pointed out earlier and case with this method. Hither: The real difference involving the actual price of a sample plus a conjecture of their values is encoded. Often known as predictive coding. Example of process include things like: differential coefficient pulse code transition, delta intonation and adaptive pulse rule modulation -- differ inwards forecasting partially. Suited where consecutive indication trials do not disagree a lot, but aren't 0."
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