Efficient vector codebook

Details Efficient vector codebook Efficient vector codebook

1991-01-25

1991-10-29

Pellinen, A. D.

Coded data generation or conversion

Digital code to digital code converters

To or from differential codes

341106, 341200, H03M 736, H03M 742

Patent

active

050619241

ABSTRACT:
A vector codebook with an ordered set of vector entries that satisfy a prearranged continuity requirement is used to encode signals. The continuity requirement specifies that consecutively considered vectors may not differ from each other by more than k elements, where k is less than the number of elements in the vectors. In one embodiment, two memories are maintained. One for determining the best codebook vector selection, and one for quantizing the input signal in accordance with the selected vector. Recognizing the possibility that the best ordering possible for a given set of codebook vectors can not satisfy the continuity requirement, the vector codebook arrangement of this invention is enlarged in such a case to include additional vectors that are interposed in the sequence of vectors and arranged to maintain the continuity requirement.

REFERENCES:
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patent: 4727354 (1988-02-01), Lindsay
patent: 4811112 (1989-03-01), Rutledge
patent: 4811265 (1989-05-01), Hashimoto et al.
patent: 4958225 (1990-09-01), Bi et al.
patent: 4965580 (1990-10-01), Tasaki et al.
EIA/TIA Project No. 2215, Cellular System, Dual-Mode Mobile Station-Base Station Compatibility Standard, IS-54 (Incorporating EIA/TIA 553), Dec. 1989, Electronic Industries Association, Engineering Department.

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