Pulse or digital communications – Bandwidth reduction or expansion – Television or motion video signal
Reexamination Certificate
2006-12-26
2006-12-26
Wong, Allen (Department: 2621)
Pulse or digital communications
Bandwidth reduction or expansion
Television or motion video signal
C375S240000, C375S240020, C375S240120
Reexamination Certificate
active
07154949
ABSTRACT:
In a quantizing circuit15, DCT coefficients output from a DCT circuit14are quantized with the quantizing step corresponding to a quantizing index supplied from a quantizing index determining circuit25. In the quantizing index determining circuit25, the quantizing index is determined on the basis of a first variable corresponding to an occurrence code amount as a data accumulative amount of a buffer17and a second variable corresponding to the activity of macroblocks output from an activity detection circuit24. In this case, the quantizing index determining circuit25adaptively sets a fixing mode for fixing the first variable or a variable mode for making variable the first variable.
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Frommer William S.
Frommer & Lawrence & Haug LLP
Levy Paul A.
Sony Corporation
Wong Allen
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