# US 10,504,524 B2 · Segment-based speaker verification using dynamically generated phrases > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,504,524 B2 - Document ID: US10504524B2 - Status: Granted - Kind: B2 - Application number: 16/017,690 - Filed: 2018-06-25 - Published: 2018-10-25 - Granted: 2019-12-10 - Earliest claimed: 2014-04-01 - Assignees: Google Inc. - Applicants: Google LLC - Inventors: Dominik Roblek; Matthew Sharifi - Web page: https://patentgrep.com/patent/US10504524B2 ## CPC - G10L 17/24: the user being prompted to utter a password or a predefined phrase - G10L 15/02: Feature extraction for speech recognition; Selection of recognition unit - G10L 17/04: Training, enrolment or model building - G10L 2015/025: {Phonemes, fenemes or fenones being the recognition units} - G10L: SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING ## Abstract A computer-implemented method includes receiving a request for a verification phrase for verifying an identity of a user, and in response to receiving the request for the verification phrase, identifying subwords to be included in the verification phrase. The method also includes, in response to identifying the subwords to be included in the verification phrase, obtaining a candidate phrase that includes at least some of the identified subwords as the verification phrase, based on a predetermined criteria. The method also includes providing the verification phrase as a response to the request for the verification phrase, wherein identifying subwords to be included in the verification phrase includes identifying candidate subwords, for which no stored acoustic data is associated with the user, as one or more of the subwords to be included in the verification phrase. ## Claims ### Claim 1 A computer-implemented method comprising: receiving a request for a verification phrase for verifying an identity of a user; in response to receiving the request for the verification phrase for verifying the identity of the user, identifying subwords to be included in the verification phrase; in response to identifying the subwords to be included in the verification phrase, obtaining a candidate phrase that includes at least some of the identified subwords as the verification phrase, based on a predetermined criteria; and providing the verification phrase as a response to the request for the verification phrase for verifying the identity of the user, wherein identifying subwords to be included in the verification phrase comprises identifying candidate subwords, for which no stored acoustic data is associated with the user, as one or more of the subwords to be included in the verification phrase. ### Claim 2 (depends on 1) The method of claim 1, wherein identifying subwords to be included in the verification phrase comprises identifying candidate subwords, for which stored acoustic data is associated with the user, as one or more of the subwords to be included in the verification phrase. ### Claim 3 (depends on 1) The method of claim 1, wherein obtaining a candidate phrase that includes at least some of the identified subwords as the verification phrase comprises: determining that a particular identified subword is particularly sound discriminative; and in response to determining that the particular identified subword is particularly sound discriminative, obtaining a candidate phrase that includes the particular identified subword that is determined to be particularly sound discriminative. ### Claim 4 (depends on 1) The method of claim 1, wherein obtaining a candidate phrase that includes at least some of the identified subwords as the verification phrase comprises: obtaining multiple candidate phrases including the candidate that includes at least some of the identified subwords; determining that the candidate phrase includes at least some of the identified subwords; and in response to determining that the candidate phrase includes at least some of the identified subwords, selecting the determined candidate phrase as the candidate phrase that includes at least some of the identified subwords from among the multiple candidate phrases. ### Claim 5 (depends on 1) The method of claim 1, further comprising: obtaining acoustic data representing the user speaking the verification phrase; determining that the obtained acoustic data matches stored acoustic data for the user; and in response to determining that the obtained acoustic data matches stored acoustic data for the user, classifying the user as the user. ### Claim 6 (depends on 5) The method of claim 5, wherein determining that the obtained acoustic data matches stored acoustic data for the user comprises determining that stored acoustic data for the at least some of the identified subwords in the verification phrase match obtained acoustic data that correspond to the at least some of the identified subwords in the verification phrase. ### Claim 7 (depends on 6) The method of claim 6, wherein obtaining a candidate phrase that includes at least some of the identified subwords as the verification phrase comprises obtaining a candidate phrase that includes at least one candidate subword for which stored acoustic data is associated with the user and at least one candidate subword for which no stored acoustic data is associated with the user. ### Claim 8 (depends on 7) The method of claim 7, further comprising storing acoustic data from the obtained acoustic data that corresponds to the identified candidate subwords, for which no stored acoustic data is associated with the user, in association with the user. ### Claim 9 A system comprising: one or more computers; and one or more storage devices storing instructions that are operable, when executed by the one or more computers, to cause the one or more computers to perform operations comprising: receiving a request for a verification phrase for verifying an identity of a user; in response to receiving the request for the verification phrase for verifying the identity of the user, identifying subwords to be included in the verification phrase; in response to identifying the subwords to be included in the verification phrase, obtaining a candidate phrase that includes at least some of the identified subwords as the verification phrase, based on a predetermined criteria, and providing the verification phrase as a response to the request for the verification phrase for verifying the identity of the user, wherein identifying subwords to be included in the verification phrase comprises identifying candidate subwords, for which no stored acoustic data is associated with the user, as one or more of the subwords to be included in the verification phrase. ### Claim 10 (depends on 9) The system of claim 9, wherein identifying subwords to be included in the verification phrase comprises identifying candidate subwords, for which stored acoustic data is associated with the user, as one or more of the subwords to be included in the verification phrase. ### Claim 11 (depends on 9) The system of claim 9, wherein obtaining a candidate phrase that includes at least some of the identified subwords as the verification phrase comprises: determining that a particular identified subword is particularly sound discriminative; and in response to determining that the particular identified subword is particularly sound discriminative, obtaining a candidate phrase that includes the particular identified subword that is determined to be particularly sound discriminative. ### Claim 12 (depends on 9) The system of claim 9, wherein obtaining a candidate phrase that includes at least some of the identified subwords as the verification phrase comprises: obtaining multiple candidate phrases including the candidate that includes at least some of the identified subwords; determining that the candidate phrase includes at least some of the identified subwords; and in response to determining that the candidate phrase includes at least some of the identified subwords, selecting the determined candidate phrase as the candidate phrase that includes at least some of the identified subwords from among the multiple candidate phrases. ### Claim 13 (depends on 9) The system of claim 9, wherein the operations further comprise: obtaining acoustic data representing the user speaking the verification phrase; determining that the obtained acoustic data matches stored acoustic data for the user; and in response to determining that the obtained acoustic data matches stored acoustic data for the user, classifying the user as the user. ### Claim 14 (depends on 13) The system of claim 13, wherein determining that the obtained acoustic data matches stored acoustic data for the user comprises determining that stored acoustic data for the at least some of the identified subwords in the verification phrase match obtained acoustic data that correspond to the at least some of the identified subwords in the verification phrase. ### Claim 15 (depends on 14) The system of claim 14, wherein obtaining a candidate phrase that includes at least some of the identified subwords as the verification phrase comprises obtaining a candidate phrase that includes at least one candidate subword for which stored acoustic data is associated with the user and at least one candidate subword for which no stored acoustic data is associated with the user. ### Claim 16 (depends on 15) The system of claim 15, wherein the operations further comprise storing acoustic data from the obtained acoustic data that corresponds to the identified candidate subwords, for which no stored acoustic data is associated with the user, in association with the user. ### Claim 17 A non-transitory computer-readable storage medium storing software comprising instructions executable by one or more computers which, upon such execution, cause the one or more computers to perform operations comprising: receiving a request for a verification phrase for verifying an identity of a user; in response to receiving the request for the verification phrase for verifying the identity of the user, identifying subwords to be included in the verification phrase; in response to identifying the subwords to be included in the verification phrase, obtaining a candidate phrase that includes at least some of the identified subwords as the verification phrase, based on a predetermined criteria; and providing the verification phrase as a response to the request for the verification phrase for verifying the identity of the user, wherein identifying subwords to be included in the verification phrase comprises identifying candidate subwords, for which no stored acoustic data is associated with the user, as one or more of the subwords to be included in the verification phrase. ### Claim 18 (depends on 17) The computer-readable storage medium of claim 17, wherein identifying subwords to be included in the verification phrase comprises identifying candidate subwords, for which stored acoustic data is associated with the user, as one or more of the subwords to be included in the verification phrase. ### Claim 19 (depends on 17) The computer-readable storage medium of claim 17, wherein obtaining a candidate phrase that includes at least some of the identified subwords as the verification phrase comprises: determining that a particular identified subword is particularly sound discriminative; and in response to determining that the particular identified subword is particularly sound discriminative, obtaining a candidate phrase that includes the particular identified subword that is determined to be particularly sound discriminative. ### Claim 20 (depends on 17) The computer-readable storage medium of claim 17, wherein obtaining a candidate phrase that includes at least some of the identified subwords as the verification phrase comprises: determining that a particular identified subword is particularly sound discriminative; and in response to determining that the particular identified subword is particularly sound discriminative, obtaining a candidate phrase that includes the particular identified subword that is determined to be particularly sound discriminative. ### Claim 21 (depends on 17) The computer-readable storage medium of claim 17, wherein obtaining a candidate phrase that includes at least some of the identified subwords as the verification phrase comprises: obtaining multiple candidate phrases including the candidate that includes at least some of the identified subwords; determining that the candidate phrase includes at least some of the identified subwords; and in response to determining that the candidate phrase includes at least some of the identified subwords, selecting the determined candidate phrase as the candidate phrase that includes at least some of the identified subwords from among the multiple candidate phrases. ### Claim 22 (depends on 17) The computer-readable storage medium of claim 17, wherein the operations further comprise: obtaining acoustic data representing the user speaking the verification phrase; determining that the obtained acoustic data matches stored acoustic data for the user; and in response to determining that the obtained acoustic data matches stored acoustic data for the user, classifying the user as the user. ### Claim 23 (depends on 22) The computer-readable storage medium of claim 22, wherein determining that the obtained acoustic data matches stored acoustic data for the user comprises determining that stored acoustic data for the at least some of the identified subwords in the verification phrase match obtained acoustic data that correspond to the at least some of the identified subwords in the verification phrase. ### Claim 24 (depends on 23) The computer-readable storage medium of claim 23, wherein obtaining a candidate phrase that includes at least some of the identified subwords as the verification phrase comprises obtaining a candidate phrase that includes at least one candidate subword for which stored acoustic data is associated with the user and at least one candidate subword for which no stored acoustic data is associated with the user. ### Claim 25 (depends on 24) The computer-readable storage medium of claim 24, wherein the operations further comprise storing acoustic data from the obtained acoustic data that corresponds to the identified candidate subwords, for which no stored acoustic data is associated with the user, in association with the user.