differential encoding

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differential encoding

[‚dif·ə‚ren·chəl in′kōd·iŋ]
(communications)
A method of compressing television signals by transmitting only differences between pixels in neighboring lines and successive frames.
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Differential coding forces the conditional entropy estimates of randomized data (isodistributional surrogates) to lose 8 to 9% of their values (white bars in Figure 8).
The level of conditional entropy at time lag [alpha] = 1 (adjacent symbols) is reduced by a theoretical value of 8.17%, induced by the constraints of differential coding. This applies if the raw data are random and statistically independent, and this also applies to PI signals, to their isospectral surrogates, and to isodistributional surrogates of all the signals.
The purpose of this appendix is to derive an exact amount of conditional entropy loss if a random and statistically independent signal is submitted to the binary differential coding.

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