The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 30, 2003
Filed:
Aug. 24, 1999
Qinetiq Limited, London, GB;
Abstract
A recognition system ( ) incorporates a filterbank analyser ( ) producing successive data vectors of energy values for twenty-six frequency intervals in a speech signal. A unit ( ) compensates for spectral distortion in each vector. Compensated vectors undergo a transformation into feature vectors with twelve dimensions and are matched with hidden Markov model states in a computer ( ). Each matched model state has a mean value which is an estimate of the speech feature vector. A match inverter ( ) produces an estimate of the speech data vector in frequency space by a pseudo-inverse transformation. It includes information which will be lost in a later transformation to frequency space. The estimated data vector is compared with its associated speech signal data vector, and infinite impulse response filters ( ) average their difference with others. Averaged difference vectors so produced are used by the unit ( ) in compensation of speech signal data vectors.