Method of determining reference values

Details Method of determining reference values Method of determining reference values

1996-05-02

1999-08-10

Hudspeth, David R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

Recognition

704252, 704254, G10L 708

Patent

active

059373822

ABSTRACT:
Reference values are required for deriving word sequences from an unknown speech signal. These reference values are determined from a known test speech signal and represent multi-dimensional mean value vectors which are derived from the characteristic vectors formed during the processing of the test speech signal. As the processing of the test speech signal progresses mean value vectors are continuously split into two new mean value vectors, again. In order to minimize the total number of mean value vectors required for the description of the individual acoustic states of a speech signal, it is proposed to link individual mean value vectors, irrespective of whether or not they are associated with different acoustic states, provided that they neighbor one another closely enough. Notably if the steps of linking and splitting are performed a number of times, preferably in an alternating fashion, there is obtained a set of mean value vectors which approximate the acoustic states comparatively accurately. The mean value vectors, being associated with an acoustic state with each time the corresponding weight, constitute the reference value for the relevant acoustic state.

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