Coded data generation or conversion – Digital code to digital code converters – With error detection or correction
Patent
1993-10-20
1995-05-23
Young, Brian K.
Coded data generation or conversion
Digital code to digital code converters
With error detection or correction
341106, 375242, H03M 1300
Patent
active
054185319
ABSTRACT:
An improved approximation of the desired codebook boundary is achieved, when quantizing data from a source with memory, by adding a dither sequence, the samples of which are contained within the Voronoi region of an unpartitioned lattice or the first level of lattice partitioning used to generate the trellis code. A sequence of data generated by the source with memory is quantized to a nearest sequence of a predetermined trellis code which is based on coset partitioning of a predetermined lattice into translates of a coset lattice. The trellis code sequence is then filtered with an inverse source filter. A dither sample is added to each sample of the sequence, such that (1) a sum of the dither sample and the filtered trellis code sequence sample lies on a super-lattice of the coset lattice, and (2) the dither sample is inside the Voronoi region of the super-lattice.
REFERENCES:
patent: 5214672 (1993-05-01), Eyuboglu et al.
patent: 5297170 (1994-03-01), Eyuboglu et al.
R. Laroia, et al. Proceedings of IEEE Intl Symposium on Information Theory, San Antonio, Tex., Jan. 17-22, 1993, p. 169 "A New Structured Quantizer for Sources With Memory".
AT&T Corp.
deBlasi Gerard A.
Young Brian K.
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