Speech recognition using adaptation and prior knowledge
First Claim
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1. A speech recognition system comprising:
- a feature extraction component configured to receive a speech signal and to extract feature vectors from the speech signal; and
a decoder comprising a speech acoustic model, a feature modification component, and a comparison component, wherein the feature modification component is configured to modify the feature vectors, using adaptation data and prior statistics, to more closely match the speech acoustic model, and wherein the comparison component is configured to utilize the modified feature vectors and the speech acoustic model to recognize the speech signal.
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Abstract
A speech recognition system includes a feature extraction component that receives a speech signal and extracts feature vectors from the speech signal. Also included, is a decoder having a speech acoustic model, a feature modification component, and a comparison component. The feature modification component changes the feature vectors, using adaptation data and prior data, to more closely match. the speech acoustic model. The comparison component utilizes the modified feature vectors and the speech acoustic model to recognize the speech signal.
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Citations
20 Claims
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1. A speech recognition system comprising:
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a feature extraction component configured to receive a speech signal and to extract feature vectors from the speech signal; and
a decoder comprising a speech acoustic model, a feature modification component, and a comparison component, wherein the feature modification component is configured to modify the feature vectors, using adaptation data and prior statistics, to more closely match the speech acoustic model, and wherein the comparison component is configured to utilize the modified feature vectors and the speech acoustic model to recognize the speech signal. - View Dependent Claims (2, 4, 5, 6, 7, 8, 9, 15, 16, 17)
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3. The method of claim 3 wherein the statistical distribution is an elliptically symmetric matrix variate distribution.
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10. A method of recognizing a speech signal using a speech acoustic model, the method comprising:
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extracting feature vectors from the speech signal;
modifying the feature vectors using adaptation data and prior data to more closely match the speech acoustic model; and
utilizing the modified feature vectors and the speech acoustic model to recognize the speech signal. - View Dependent Claims (11, 12, 13, 14)
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18. A decoder for use in a speech recognition system, the decoder comprising:
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a speech acoustic model;
a feature modification component; and
a comparison component, wherein the feature modification component is configured to modify feature vectors extracted from a speech signal, using adaptation data and prior statistics, to more closely match the speech acoustic model, and wherein the comparison component is configured to utilize the modified feature vectors and the speech acoustic model to recognize the speech signal. - View Dependent Claims (19, 20)
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Specification