US5167004A
Expired / Lapsed
US
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Temporal decorrelation method for robust speaker verification
Assignee: General Hospital Corp
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Filing: 1991-02-28
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Granted: 1992-11-24
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Expires: 2011-02-28
Abstract
Abstract A speaker voice verification system uses temporal decorrelation linear transformation and includes a collector for receiving speech inputs from an unknown speaker claiming a specific identity, a word-level speech features calculator operable to use a temporal decorrelation linear transformation for generating word-level speech feature vectors from such speech inputs, word-level speech feature storage for storing word-level speech feature vectors known to belong to a speaker with the specific identity, a word-level speech feature vectors received from the unknown speaker with those received from the word-level speech feature storage, and speaker verification decision circuitry for determining, based on the similarity score, whether the unknown speaker's identity is the same as that claimed. The word-level vector scorer further includes concatenation circuitry as well as a word-specific orthogonalizing linear transformer. Other systems and methods are also disclosed.
Inventors
- 👤 Lorin P. Netsch
- 👤 George R. Doddington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:32
CPC Classifications
G; G10; G10L; G10L17/00; G10L17/02; G10L17/20
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
155 words
An automated temporal decorrelation system for speaker voice verification, comprising: a collector for receiving speech inputs from an unknown speaker claiming a specific identity into a plurality of input vectors for each word spoken; a word-level speech feature calculator operable to utilize a temporal decorrelation transformation for generating word-level speech feature vectors from said speech inputs received from said collector thereby creating whole-word vectors which are statistically uncorrelated over entire words with said speech inputs; word-level speech feature storage for storing word-level speech feature vectors known to belong to a speaker with said specific identity; a word-level vector scorer to calculate a similarity score between said word-level speech feature vectors received from said word-level speech feature calculator with those received from said word-level speech feature storage; and speaker verification decision circuitry for determining, based on said similarity score received from said word-level vector scorer, whether said unknown speaker is said speaker with said specific identity.
Claim 2
Dependent Claim
39 words
The system of claim 1, wherein said word-level speech feature calculator employs HMM alignment to map said input speech vectors to speaker independent reference model vectors which correspond to each word associated with the speaker with the claimed identity.
Claim 3
Dependent Claim
37 words
The system of claim 1, wherein said word-level vector scorer further comprises concatenation circuitry for concatenating said plurality of input vectors making up a single word to form single vectors representing whole words in said speech inputs.
Claim 4
Dependent Claim
41 words
The system of claim 1, wherein said similarity score is a sum, over all words, of Euclidean distances between said word-level speech feature vectors from said word-level speech feature calculator and those which were stored in said word-level speech feature storage.
Claim 5
Dependent Claim
112 words
A temporal decorrelation method for speaker voice verification, comprising the steps of: collecting into a plurality of input vectors a verification utterance from an unknown speaker claiming a specific identity; transforming said plurality of input vectors using a temporal decorrelation transformation to establish a word-level speech feature vectors thereby creating whole-word vectors which are statistically uncorrelated over entire words with said utterance; retrieving previously stored word-level speech feature vectors known to belong to a speaker with said specific identity; scoring said word-level speech feature vectors generated during said step of establishing with said previously stored word-level speech feature vectors; and determining whether said unknown speaker is said speaker with said specific identity.
Claim 6
Dependent Claim
47 words
The method of claim 5, wherein said step of establishing word-level speech feature vectors further comprises the step of employing HMM alignment to map said input speech vectors to speaker independent reference model vectors which correspond to each word associated with said speaker with the claimed identity.
Claim 7
Dependent Claim
36 words
The method of claim 5, wherein said step of scoring further comprises the step of concatenating said plurality of input vectors making up a single word to form single vectors representing whole words in said utterance.
Claim 8
Dependent Claim
41 words
The method of claim 5, wherein said similarity score is a sum, over all words, of Euclidean distances between said word-level speech feature vectors from said word-level speech feature calculator and those which were stored in said word-level speech feature storage.
Claim 9
Dependent Claim
59 words
A temporal decorrelation method for reducing the amount of storage necessary for speaker specific speech information, comprising the steps of: establishing word-level speech feature vectors having a dimension from a spoken utterance; reducing the dimension of said word-level speech feature vectors by applying a temporal decorrelation linear transformation to said word-level feature vectors; and storing said word-level feature vectors.
Claim 10
Dependent Claim
59 words
A temporal decorrelation method for reducing the amount of storage necessary for speaker specific speech information, comprising the steps of: establishing word-level speech feature vectors having a dimension from a spoken utterance; reducing the dimension of said word-level speech feature vectors by applying a temporal decorrelation linear transformation to said word-level feature vectors; and storing said word-level feature vectors.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-11-24 | 1996-05-25 | 1996-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-11-24 | 2000-05-25 | 2000-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-11-24 | 2004-05-25 | 2004-11-24 | $7700.00 | Window Closed / Lapsed |