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Djpark0115 ( talk) 07:00, 21 May 2009 (UTC) Q-1 is necessary in the encoder/ecoder diagram of option2 ??
Q-1 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. — Preceding unsigned comment added by 188.155.108.64 ( talk • contribs)
Please explain the roles of Z-1, the circuitry. —Preceding unsigned comment added by Piotroxp ( talk • contribs) 06:51, 19 June 2009 (UTC)
what does "local model" means in the option 2 section? -- 190.60.93.218 ( talk) 18:53, 29 May 2014 (UTC)
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). — Preceding unsigned comment added by 130.75.31.216 ( talk) 09:21, 20 August 2018 (UTC)