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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??

regards
 

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



regards
 

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 .
 

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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