Method for determining the variation with time of a speech parameter and arrangement for carryin out the method
US4813075A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 24, 1987 |
| Grant date | Mar 14, 1989 |
| Priority date | — |
| Expiry date | Nov 24, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG10L25/90
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
In a speech or speaker recognition system, a segment or sequence of speech parameter values are smoothed to a most probable sequency by Dynamic Programming. The method for determining the variation with time of a speech parameter is based on a speech signal which is subdivided into successive segments and an individual value exists in each segment and for each value of the parameter within a limited range of values. For the example of the fundamental voice frequency, a value has been generated in each speech segment with the aid of the AMDF (Average Magnitude Difference Function). The required variation now links a sequency of horizontally, vertically or diagonally directly adjacent speech parameter values to one another in such a manner that the sum of the associated individual values represents a minimum. In this arrangement, this sum is slightly magnified in diagonal or vertical sections since a horizontal variation is most probable. This magnification is controlled by certain fixed values which influence the smoothness of the variation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.