Wide-band speech spectral quantizer
US5956672A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 15, 1997 |
| Grant date | Sep 21, 1999 |
| Priority date | — |
| Expiry date | Aug 15, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L19/0204
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A band splitter 3 makes predetermined frequency band splitting and computes each sub-band spectral coefficient for the cut out speech signal. Analyzers 5 and 7 each compute a spectral coefficient vector of each sub-band. Adders 15 and 17 each obtain a result e(i) of subtraction of each sub-band predicted spectral coefficient vector s.sub.-- (i) computed in the band splitter 13 from a spectral coefficient vector s(i). A quantizer 19 quantizes the result e(i) of subtraction for the full band, thus outputting a quantized prediction error vector e.sub.-- (i) from output terminals 21 and 22. A full-band quantized vector E.sub.-- (i) is generated by combining the quantized prediction error vectors c.sub.-- (i) of all the sub-bands. A synthesizer 9 outputs a full-band spectral coefficient vector S.sub.-- (i) by combining the spectral coefficient vectors s(i) of all the sub-bands received from each of the analyzers 5 and 7. An optimum prediction circuit 11 computes a full-band predicted spectral coefficient vector S (i) from the full-band quantized vector E.sub.-- (i) received from the quantizer 19 and the full-band predicted spectral coefficient vector S.sub.-- (i). A band splitter 13 ban…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.