Vector quantization coding apparatus and decoding apparatus
US5859932A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 23, 1997 |
| Grant date | Jan 12, 1999 |
| Priority date | — |
| Expiry date | Dec 23, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T9/008
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
To transmit and record an input pattern efficiently by dividing the input pattern into a vector quantization index and its difference signal, and sequentially optimize the vector quantization code book. A least distortion vector determining unit 101 issues a representative vector y.sub.m having least square error in y.sub.i in the code book, with respect to an inputted 64-dimensional vector x, and simultaneously issues its index m, and the difference vector d obtained as d=x-y.sub.m in a subtractor 103 is quantized in a quantizing unit 104, and is issued together with the index data. Afterwards, a difference vector d' is determined in an inverse quantizing unit 106, and a code book changing unit 107 changes so that the representative vector Y.sub.m may be closer to the input vector x by using this difference vector. At the decoding side, synchronously, the representative vector y.sub.m is changed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.