Coded data generation or conversion – Quantizer
Reexamination Certificate
2005-01-31
2008-10-14
Mai, Lam T (Department: 2819)
Coded data generation or conversion
Quantizer
C341S155000
Reexamination Certificate
active
07436347
ABSTRACT:
In one exemplary embodiment, an adaptive quantiser includes: an input; a memory configured to store a representation of the distribution of the quantiser output for an expected input signal; a data recording configuration operable to record the actual input signal over a period that is statistically significant, the data recording configuration comprising an analogue-to-digital converter and a second memory configured to cyclically store the output of the analogue-to-digital converter; and a processor configured to set quantisation steps in dependence on the recorded input signal so that the quantiser output distribution tends to match said represented distribution.
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Ortega, A., et al., “Adaptive Scalar Quantization without Side Information”, IEEE Transactions on Image Processing, IEEE Inc., New York, US, vol. 6, No. 5, May 1997, pp. 665-676.
Harrington & Smith PC
Mai Lam T
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