Apparatus and method of speech coding and decoding using multiple frames
US6496797B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 1, 1999 |
| Grant date | Dec 17, 2002 |
| Priority date | — |
| Expiry date | Apr 1, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L25/27
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An apparatus and method for speech compression includes dividing the speech spectrum into a plurality of frames, assigning frame classifications to the plurality of frames, and determining the speech modeling parameters based on the assigned frame classification. The voiced part of the speech spectrum and the unvoiced part of the speech spectrum are synthesized separately using an Analysis by Synthesis allowing a correct correspondence between voiced and unvoiced parts of the reconstructed signal. Particularly, a frequency response of a special simulated signal based on the previous and current frames is used as an approximating function. The simulated signal is synthesized at the encoder side in the way it will be generated at the decoder side. Also, a better of two encoding methods is selected to encode the spectral magnitudes. A wavelet encoder and an inter-frame predictive encoder illustrate the invention's efficient, yet accurate reconstruction of synthesized digital speech.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.