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PURPOSE OF PREDICTION

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elecs_gene

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hi
could u guys tell me the purpose of predicting the next sample value from the previous value we employ in differential PCM?why is there a need for such estimation and what purpose does it solve??does that reduce the quantisation error??if yes,why??

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Nimer

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hi
prediction increases system efficiency and decreasese reception computations and gives something to compare with to locate large errors



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mystique_unbound

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We are tring to use the redundancy in the data bit pattern like in our speech signal where spectrum is centered in a particular band. Simlarly in image based systems you have compression techniques which involves compression of high frequency components to reduce the effective size of the image .
 

mro83

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in DPCM, we send the difference of 2 samples because sending the sample itself needss more bits and with sending difference, less bits are sent.
in the receiver u want to detect the deferenced bit so u should know the previous sample an so u need adaptive prediction.
 

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