Speaker verification system and process

Claim 2

A speaker verification system comprising: a first memory for storing, as control reference patterns, patterns which are obtained by speaking a predetermined password under a plurality of predetermined conditions; a second memory for storing, as a verification reference pattern corresponding to a registered speaker, a pattern which is obtained by said registered speaker speaking said password; means for selecting a predetermined number of the control reference patterns from said first memory consecutively, starting from said control reference pattern which is the most similar to the verification reference pattern corresponding to said registered speaker; means for determining, during verification, a first dissimilarity between the input pattern obtained by the speech of a person being verified and the verification reference pattern corresponding to said registered speaker, and second dissimilarities between said input pattern and the selected control reference patterns; and means for outputting a confirmation signal when said first dissimilarity is less than both said second dissimilarities and a predetermined threshold value.

Claim 3

A speaker verification system according to Claim 1, wherein the patterns which are obtained by speaking under the predetermined plurality of conditions are those which are obtained as a result of a plurality of predetermined persons speaking said password.

Claim 4

A speaker verification system comprising: an input analyzer for analyzing a word spoken by a registered speaker or a person being verified, and outputting the result as an input pattern; a registration number designator for outputting a registration number; an input pattern buffer for storing said input pattern; a verification reference pattern memory for storing said input pattern as a verification reference pattern during registration, designated by said registration number; a control reference pattern memory for storing, as control reference patterns, patterns which are obtained when a plurality of predetermined persons speak a predetermined password; a pattern matching unit for determining first dissimilarities between said verification reference pattern and said control reference patterns, a second dissimilarity between the input pattern of said person being verified, which is obtained during the verification, and said verification reference pattern, and third dissimilarities between said input pattern and said control reference patterns; a control reference pattern designator for selecting a plurality of first dissimilarities consecutively, starting from the smallest of said first dissimilarities, to designate the control reference patterns corresponding to the selected dissimilarities as the control reference patterns corresponding to said registration number; and a judgement unit for generating a confirmation signal when said second dissimilarity is less than both said third dissimilarities corresponding to said designated control reference patterns and a predetermined threshold value.

Claim 5

A speaker verification system comprising: an input analyzer for analyzing a word spoken by a registered speaker or a person being verified, and outputting the result as an input pattern; a registration number designator for outputting a registration number; an input pattern buffer for storing said input pattern; a verification reference pattern memory for storing said input pattern as a verification reference pattern during registration, designated by said registration number; a control reference pattern memory for storing, as control reference patterns, patterns which are obtained when a plurality of predetermined persons speak a predetermined password; a pattern matching unit for determining first dissimilarities between said verification reference pattern and said control reference patterns, a second dissimilarity between the input pattern of said person being verified, which is obtained during the verification, and said verification reference pattern, and third dissimilarities between said input pattern and said control reference patterns; a control reference pattern designator for selecting a plurality of first dissimilarities consecutively, starting from the smallest of said first dissimilarities, to designate the control reference patterns corresponding to the selected dissimilarities as the control reference patterns corresponding to said registration number; and a judgement unit for generating a confirmation signal when said second dissimilarity is less than both said third dissimilarities corresponding to said designated control reference patterns and a predetermined threshold value.

Claim 6

A speaker verification system according to Claim 3, further comprising a switch for connecting the output of said input pattern buffer to said verification reference pattern memory during registration and to said pattern matching unit during verification.

Claim 7

A speaker verification system comprising: an input analyzer for analyzing first and second passwords spoken by a registered speaker or a person being verified, and outputting the result as input patterns; a registration number designator for outputting a registration number; an input pattern buffer for storing said input patterns; a verification reference pattern memory for storing said input patterns as first and second verification reference patterns corresponding to said first and second passwords during registration, designated by said registration number; a first control reference pattern memory for storing, as first control reference patterns, patterns which are obtained when a plurality of predetermined persons speak said first password; a second control reference pattern memory for storing, as second control reference patterns, patterns which are obtained when said registered speaker speaks a plurality of words similar in pronunciation to said second password; a pattern matching unit for determining first dissimilarities between said first verification reference pattern and said first control reference patterns, a second dissimilarity between a first verification input pattern corresponding to said first nassword obtained during verification and said first verification reference pattern, third dissimilarities between said first verification input pattern and said first control reference patterns, a fourth dissimilarity between a second verification input pattern corres D onding to said second D assword and said second verification reference pattern, and fifth dissimilarities between said second verification input pattern and second control reference patterns; a control reference pattern designator for selecting a plurality of first dissimilarities consecutively, starting from the smallest of said first dissimilarities, to designate the first control reference patterns corresponding to the selected dissimilarities as the first control reference patterns corresponding to said registered number, and outputting said first control reference patterns to said pattern matching unit; and a judgement unit for generating a first confirmation signal when said second dissimilarity is less than both said third dissimilarities corresponding to said designated first control reference patterns and a predetermined threshold value, generating a second confirmation signal when said fourth dissimilarity is less than both said fifth dissimilarities and a predetermined threshold value, and generating another confirmation signal when both said first and second confirmation signals are generated.

Claim 8

A speaker verification system comprising: an input analyzer for analyzing first and second passwords spoken by a registered speaker or a person being verified, and outputting the result as input patterns; a registration number designator for outputting a registration number; an input pattern buffer for storing said input patterns; a verification reference pattern memory for storing said input patterns as first and second verification reference patterns corresponding to said first and second passwords during registration, designated by said registration number; a first control reference pattern memory for storing, as first control reference patterns, patterns which are obtained when a plurality of predetermined persons speak said first password; a second control reference pattern memory for storing, as second control reference patterns, patterns which are obtained when said registered speaker speaks a plurality of words similar in pronunciation to said second password; a pattern matching unit for determining first dissimilarities between said first verification reference pattern and said first control reference patterns, a second dissimilarity between a first verification input pattern corresponding to said first nassword obtained during verification and said first verification reference pattern, third dissimilarities between said first verification input pattern and said first control reference patterns, a fourth dissimilarity between a second verification input pattern corres D onding to said second D assword and said second verification reference pattern, and fifth dissimilarities between said second verification input pattern and second control reference patterns; a control reference pattern designator for selecting a plurality of first dissimilarities consecutively, starting from the smallest of said first dissimilarities, to designate the first control reference patterns corresponding to the selected dissimilarities as the first control reference patterns corresponding to said registered number, and outputting said first control reference patterns to said pattern matching unit; and a judgement unit for generating a first confirmation signal when said second dissimilarity is less than both said third dissimilarities corresponding to said designated first control reference patterns and a predetermined threshold value, generating a second confirmation signal when said fourth dissimilarity is less than both said fifth dissimilarities and a predetermined threshold value, and generating another confirmation signal when both said first and second confirmation signals are generated.

Claim 9

A speaker verification system according to Claim 5, further comprising a switch for connecting the output from said input pattern buffer to said verification reference pattern memory during registration, and to said pattern matching unit and said control reference pattern memory during verification.

Claim 10

A speaker verification system according to Claim 5, wherein said first and second passwords are different from each other, and wherein said second password is determined individually for each registered speaker.

Claim 11

A speaker verification system according to Claim 5, wherein said first and second passwords are the same passwords.

Claim 12

A speaker verification process, particularly for a system according to any of claims 1 to 8, the process comprising the steps of: storing, as control reference patterns, patterns which are obtained by speaking a predetermined password under a plurality of predetermined conditions; storing, as a verification reference pattern . corresponding to a registered speaker, a pattern which is obtained by said registered speaker speaking said password; selecting a predetermined number of the control reference patterns from said first memory consecutively, starting from said control reference pattern which is the most similar to the verification reference pattern corresponding to said registered speaker; determining, during verification, a first dissimilarity between the input pattern obtained by the speech of a person being verified and the verification reference pattern corresponding to said registered speaker, and second dissimilarities between said input pattern and the selected control reference patterns; and outputting a confirmation signal when said first dissimilarity is less than both said second dissimilarities and a predetermined threshold value.