Patent US4647863A successfully refreshed from Google Patents.
US4256924A
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Device for recognizing an input pattern with approximate patterns used for reference patterns on mapping
Assignee: NEC Corp
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Filing: 1979-11-19
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Granted: 1981-03-17
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Expires: 1999-11-19
Abstract
Abstract In a speech recognition system which time-normalizes (i.e. aligns by time-warping) each pre-stored reference pattern of feature vectors b j before comparison with the input signal pattern vectors a i , an improved time-alignment technique requiring less calculation, by selecting "standard" vectors v m (j) which approximate the reference vectors thereby simplifying the derivation of the time-warp mapping function j=j(i).
Inventors
- 👤 Hiroaki Sakoe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:32
CPC Classifications
G; G10; G10L; G10L15/00; G10L15/08; G10L15/12
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
241 words
A pattern recognition device for recognizing an input pattern by calculating similarity measures between said input pattern and a predetermined number of reference patterns, said device comprising: input pattern buffer means for memorizing a time sequence of input pattern feature vectors a i (i=1, 2, . . . , I) representative of said input pattern; reference pattern memory means for memorizing time sequences of reference pattern feature vectors b n j (n=1, 2, . . . , N; j=1, 2, . . . , J n ) representative of the respective reference patterns; standard vector memory means for memorizing standard vectors v m (m=1, 2, . . . , F) preselected in consideration of the reference pattern feature vectors b j n ; dictionary memory means for memorizing a dictionary given by suffixes m n (j) for identifying selected ones v m n (j) of said standard vectors v m , said selected standard vectors v m n (j) being those of said standard vectors v m which are most similar to the reference pattern feature vectors b j n of the respective reference patterns; time normalizing means for finding a mapping function j=j(i) for carrying out time normalization between said input pattern and each of said reference patterns by minimizing as a whole the difference between said input pattern feature vectors a i and the standard vectors v m (j) specified by said dictionary for each said reference pattern; and
Claim 2
Dependent Claim
241 words
A pattern recognition device for recognizing an input pattern by calculating similarity measures between said input pattern and a predetermined number of reference patterns, said device comprising: input pattern buffer means for memorizing a time sequence of input pattern feature vectors a i (i=1, 2, . . . , I) representative of said input pattern; reference pattern memory means for memorizing time sequences of reference pattern feature vectors b n j (n=1, 2, . . . , N; j=1, 2, . . . , J n ) representative of the respective reference patterns; standard vector memory means for memorizing standard vectors v m (m=1, 2, . . . , F) preselected in consideration of the reference pattern feature vectors b j n ; dictionary memory means for memorizing a dictionary given by suffixes m n (j) for identifying selected ones v m n (j) of said standard vectors v m , said selected standard vectors v m n (j) being those of said standard vectors v m which are most similar to the reference pattern feature vectors b j n of the respective reference patterns; time normalizing means for finding a mapping function j=j(i) for carrying out time normalization between said input pattern and each of said reference patterns by minimizing as a whole the difference between said input pattern feature vectors a i and the standard vectors v m (j) specified by said dictionary for each said reference pattern; and
Claim 3
Dependent Claim
37 words
pattern matching means for carrying out pattern matching between said input pattern and said each reference pattern based on the mapping function j=j(i) to derive a similarity measure between said input pattern and said each reference pattern.
Claim 4
Dependent Claim
37 words
pattern matching means for carrying out pattern matching between said input pattern and said each reference pattern based on the mapping function j=j(i) to derive a similarity measure between said input pattern and said each reference pattern.
Claim 5
Dependent Claim
38 words
A device as claimed in claim 1, further comprising decision means responsive to the similarity measures derived for the respective reference patterns for deciding one of said reference patterns as a result of recognition of said input pattern.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-16 | 1984-09-15 | 1985-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-16 | 1988-09-15 | 1989-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-16 | 1992-09-15 | 1993-03-17 | $7700.00 | Window Closed / Lapsed |