Very low bit rate voice messaging system using asymmetric voice compression processing
US5781882A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 14, 1995 |
| Grant date | Jul 14, 1998 |
| Priority date | — |
| Expiry date | Sep 14, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L25/27
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An apparatus and method for processing a voice message to provide low bit rate speech transmission processes the voice message to generate speech parameters which are arranged into a two dimensional parameter matrix (502) including a sequence of parameter frames. The two dimensional parameter matrix (502) is transformed using a predetermined two dimensional matrix transformation function (414) to obtain a two dimensional transform matrix (506). Distance values representing distances between templates of a set of predetermined templates and the two dimensional transform matrix (506) are then derived. The distance values derived are identified by indexes identifying the templates of the set of predetermined templates. The distance values derived are compared, and an index corresponding to a template of the set of predetermined templates having a shortest distance is selected and then transmitted.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.