Reduction of phase information in coding of speech
US5504832A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 23, 1992 |
| Grant date | Apr 2, 1996 |
| Priority date | — |
| Expiry date | Dec 23, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L19/002
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
In an encoding device (100) operable in response to an input speech signal by means of an adaptive transform coding to produce an output encoded speech signal, the input speech signal is partitioned into data blocks by a partition circuit (113). Each of data blocks is decomposed into a plurality of frequency components by a Fourier transformer (114). A spectral envelope calculator (120) estimates intensity of a spectral envelope of the input speech signal. In cooperation with a scalar spectral calculator (115) and a bit assignment determiner (121), a quantizer (116) quantizes or encodes the frequency components with phase information selectively removed from a part of the frequency components on the basis of the intensity of the spectral envelope. In a decoding device, a phase information assignor assigns pseudo-phase information to each of the frequency components from which the phase information is selectively removed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.