Process for measuring the resemblance between sound samples and apparatus for performing this process
US5469529A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 21, 1993 |
| Grant date | Nov 21, 1995 |
| Priority date | — |
| Expiry date | Sep 21, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L17/06
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A process and apparatus for measuring the resemblance between sound samples incorporating a learning phase and a test phase, each having a digital acquisition and preprocessing stage, an order p acoustic analysis stage and a p.times.p covariance matrix calculating stage with respect to the resulting vector signal, the learning phase also having a reference X covariance matrix inversion stage and a stage of storing the thus obtained matrix X.sup.-1 in a dictionary, the test phase incorporating a stage of multiplying the covariance matrix of test Y with the reference matrix X.sup.-1, a stage of extracting all or part of the p eigenvalues .lambda.k of said matrix product and a calculating stage using a family of functions f, called generalized sphericity functions, so as to obtain a digital value measuring the resemblance between the considered test sample and the reference samples of the dictionary. Alternative implementations are also described, which advantageously allow the same result to be obtained without requiring the explicit calculation of eigenvalues.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.