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[[User:Djpark0115|Djpark0115]] ([[User talk:Djpark0115|talk]]) 07:00, 21 May 2009 (UTC)
Q<sup>-1</sup> is necessary in the encoder/ecoder diagram of option2 ??
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:Yes, good catch; it's needed in the type 2 encoder as well. Maybe you can alert the editor who made the figure... [[User:Dicklyon|Dicklyon]] ([[User talk:Dicklyon|talk]]) 17:19, 21 May 2009 (UTC)
Q<sup>-1</sup> is horribly wrong! Quantization is not invertible. Option 1 is only possible if no quantization is done and the compression algorithm is lossless. The whole article has a lot of errors.
:You were right to remove the bad figure from option 1. I edited the text to make it correct, I think. [[User:Dicklyon|Dicklyon]] ([[User talk:Dicklyon|talk]]) 18:07, 8 January 2011 (UTC)
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:I noted in the article that it represents a sample delay; it's obscure conventional DSP notation based on the [[Z transform]]. [[User:Dicklyon|Dicklyon]] ([[User talk:Dicklyon|talk]]) 18:16, 8 January 2011 (UTC)
== Local model ==
what does "local model" means in the option 2 section? --[[Special:Contributions/190.60.93.218|190.60.93.218]] ([[User talk:190.60.93.218|talk]]) 18:53, 29 May 2014 (UTC)
== Entropy is not reduced ==
Hello,
the statement "because the entropy of the difference signal is much smaller than that of the original discrete signal" is wrong. The idea of a DPCM is to reduce the variance by building a difference signal. The entropy is not reduced (it is not changed at all by calculating the difference signal). Entropy is only reduced in the quantized signal (obviously). <!-- Template:Unsigned IP --><small class="autosigned">— Preceding [[Wikipedia:Signatures|unsigned]] comment added by [[Special:Contributions/130.75.31.216|130.75.31.216]] ([[User talk:130.75.31.216#top|talk]]) 09:21, 20 August 2018 (UTC)</small> <!--Autosigned by SineBot-->
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