Pulse or digital communications – Pulse code modulation
Patent
1995-12-21
1999-02-09
Pham, Chi H.
Pulse or digital communications
Pulse code modulation
375245, 341143, 348472, H04B 1406
Patent
active
058704345
ABSTRACT:
A subtraction device subtracts a predicted value generated by a predicting portion from a digital picture signal supplied through an input terminal. The subtraction device generates a difference signal as an output signal. A quantizing portion detects an activity of the difference signal, designates the number of quantizing steps corresponding to the activity, and quantizes the difference signal with the number of quantizing steps. The quantizing portion outputs side information to an output terminal.
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Zetterberg, L. H.; Ericsson, S.; Couturier, C.: "DPCM Picture Coding with Two-Dimensional Control of Adaptive Quantization", IEEE Transactions on Communications, vol. COM-32, No. 4, Apr. 1983, pp. 457-462, XP002055655.
Burt, Peter J. and Adelson, Edward H.: "The Laplacian Pyramid as a Compact Image Code", IEEE Transactions on Communications, vol. COM-31, No. 4, Apr. 1983, pp. 532-540, XP000570701.
Fujimori Yasuhiro
Kawaguchi Kunio
Kondo Tetsujiro
Takahashi Kenji
Frommer William S.
Pham Chi H.
Sony Corporation
Webster Bryan
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