# US 2021/0334348 A1 · Biometric authentication apparatus and operation method thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0334348 A1 - Document ID: US20210334348A1 - Status: Published application - Kind: A1 - Application number: 17/239,005 - Filed: 2021-04-23 - Published: 2021-10-28 - Earliest claimed: 2020-04-24 - Assignees: Electronics and Telecommunications Research Institute - Applicants: Electronics and Telecommunications Research Institute - Inventors: Joo Yong SIM; Hyung Wook NOH; Chang-Geun AHN - Web page: https://patentgrep.com/patent/US20210334348A1 ## CPC - G06F 21/32: using biometric data, e.g. fingerprints, iris scans or voiceprints - G06F 18/24133: {Distances to prototypes} - G06F 18/24323: {Tree-organised classifiers} - G06V 40/50: Maintenance of biometric data or enrolment thereof - G06V 40/70: Multimodal biometrics, e.g. combining information from different biometric modalities - G06F 2218/10: by analysing the shape of a waveform, e.g. extracting parameters relating to peaks - G06F 2221/2139: Recurrent verification - G06V 40/15: {Biometric patterns based on physiological signals, e.g. heartbeat, blood flow} - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) - G06V: IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING ## Abstract A biometric authentication apparatus is provided. The biometric authentication apparatus includes one or more converters that convert a transmit signal of an electrical signal into a vibration signal of a mechanical signal and transmit the vibration signal vibrating within a set frequency range to a user, one or more sensor that receive a biometric signal corresponding to the vibration signal from the user and convert the biometric signal into a receive signal of an electrical signal, an authentication module that extracts anatomical feature information of the user from the receive signal and determines whether the user is a registered user based on the anatomical feature information, and a memory that stores a database for the registered user. The biometric signal is a frequency-based signal modified to include the anatomical feature information while the vibration signal passes through at least a portion of the body of the user. ## Claims ### Claim 1 A biometric authentication apparatus, comprising: one or more converters configured to convert a transmit signal of an electrical signal into a vibration signal of a mechanical signal and transmit the vibration signal vibrating within a set frequency range to a user; one or more sensors configured to receive a biometric signal corresponding to the vibration signal from the user and convert the biometric signal into a receive signal of an electrical signal; an authentication module configured to extract anatomical feature information of the user from the receive signal and determine whether the user is a registered user based on the anatomical feature information; and a memory configured to store a database for the registered user, wherein the biometric signal is a frequency-based signal modified to include the anatomical feature information while the vibration signal passes through at least a portion of a body of the user. ### Claim 2 (depends on 1) The biometric authentication apparatus of claim 1, wherein the anatomical feature information includes at least one of a biomaterials feature, a biomechanical feature, and a geometrical structure feature for at least one of a bone, a cartilage, a tendon, and a muscle tissue, which are included in the at least a portion of the body of the user. ### Claim 3 (depends on 2) The biometric authentication apparatus of claim 2, wherein the authentication module includes: a waveform generator configured to generate a reference waveform within the set frequency range and control the one or more converters to output the vibration signal depending on the reference waveform; a demodulator configured to receive the receive signal from the one or more sensors and demodulate the receive signal based on the reference waveform; a filter configured to filter the demodulated receive signal; and a micro-controller configured to process the filtered receive signal to extract the anatomical feature information, classify the user based on the anatomical feature information, and compare the classified user with the registered user to determine whether the classified user corresponds to the registered user. ### Claim 4 (depends on 3) The biometric authentication apparatus of claim 3, wherein the micro-controller is configured to receive a user contact signal and controls the waveform generator to generate the reference waveform in response to the user contact signal. ### Claim 5 (depends on 3) The biometric authentication apparatus of claim 3, wherein registration user information including the anatomical feature information of the registered user is stored in the database, and wherein the micro-controller is configured to receive the registration user information from the memory and retrieve for the registration user information corresponding to information of the classified user. ### Claim 6 (depends on 1) The biometric authentication apparatus of claim 1, wherein the one or more sensor include a first sensor and a second sensor being located at different locations, wherein each of the first sensor and the second sensor is spaced apart from the one or more converters at a certain distance, and wherein the first sensor and the second sensor respectively receive a first biometric signal and a second biometric signal passing through different portions of the body of the user. ### Claim 7 (depends on 6) The biometric authentication apparatus of claim 6, wherein the one or more converters include a first converter, wherein the first convertor is configured to output a first vibration signal of a first set frequency range and a second vibration signal of a second set frequency range, wherein the first sensor is configured to receive the first biometric signal corresponding to the first vibration signal, and wherein the second sensor is configured to receive the second biometric signal corresponding to the second vibration signal. ### Claim 8 (depends on 6) The biometric authentication apparatus of claim 6, wherein the one or more converters include a second converter and a third converter being located at different locations, wherein the second converter is configured to output a third vibration signal of a third set frequency range, and wherein the third converter is configured to output a fourth vibration signal of a fourth set frequency range. ### Claim 9 (depends on 1) The biometric authentication apparatus of claim 1, wherein the one or more sensor include a third sensor, wherein the one or more converters include a fourth converter and a fifth converter being located at different locations, wherein the fourth converter is configured to output a fourth vibration signal of a fourth set frequency range, wherein the fifth converter is configured to output a fifth vibration signal of a fifth set frequency range, and wherein the third sensor is configured to receive a fourth biometric signal corresponding to the fourth vibration signal and a fifth biometric signal corresponding to the fifth vibration signal. ### Claim 10 (depends on 1) The biometric authentication apparatus of claim 1, further comprising: a vibration insulator disposed between the one or more converters and the one or more sensors. ### Claim 11 (depends on 1) The biometric authentication apparatus of claim 1, further comprising: a guide being in contact with the at least a portion of the body of the user to fix the at least a portion of the body of the user. ### Claim 12 (depends on 11) The biometric authentication apparatus of claim 11, wherein the one or more converters and the one or more sensors are arranged in a direction opposite to a surface being in contact with the at least a portion of the body on the guide, and wherein one or more locations of the one or more converters and one or more locations of the one or more sensors are displayed on the guide. ### Claim 13 An operation method of a biometric authentication apparatus, the operation method comprising: outputting a vibration signal vibrating within a set frequency range depending on a reference waveform to a user; receiving a biometric signal corresponding to the vibration signal from the user; extracting anatomical feature information of the user from the biometric signal; classifying the user based on the anatomical feature information; determining whether the user is a registered user; and completing user authentication in response to determining that the user is the registered user, wherein the biometric signal is measured by a sensor and is a frequency-based signal modified to include the anatomical feature information while the vibration signal passes through at least a portion of a body of the user. ### Claim 14 (depends on 13) The operation method of claim 13, wherein the anatomical feature information includes at least one of a biomaterials feature, a biomechanical feature, and a geometrical structure feature for at least one of a bone, a cartilage, a tendon, and a muscle tissue, which are included in the at least a portion of the body. ### Claim 15 (depends on 13) The operation method of claim 13, wherein the receiving of the biometric signal includes converting the biometric signal into a receive signal of an electrical signal. ### Claim 16 (depends on 15) The operation method of claim 15, wherein the extracting of the anatomical feature information of the user includes: modulating the receive signal based on the reference waveform; filtering the modulated receive signal; converting the filtered receive signal into a digital signal; and processing the digital signal to extract the anatomical feature information. ### Claim 17 (depends on 13) The operation method of claim 13, wherein the classifying of the user includes classifying the user based on the anatomical feature information using a classification algorithm. ### Claim 18 (depends on 13) The operation method of claim 13, further comprising: in response to determining that the user is not the registered user: outputting a feedback signal requesting the user to perform re-authentication; and repeating a user authentication operation a predetermined number of times. ### Claim 19 A biometric authentication apparatus, comprising: a vibration signal transceiver configured to transmit a vibration signal to a user and receiving a biometric signal corresponding to the vibration signal; an authentication module configured to extract anatomical feature information of the user based on the biometric signal and determine whether the user is a registered user based on the anatomical feature information; and a memory configured to store a database for the registered user, wherein the vibration signal transceiver includes: a conversion circuit configured to convert a transmit signal of an electrical signal into the vibration signal of a mechanical signal and transmit the vibration signal vibrating within a set frequency range to the user; and a sensing circuit configured to receive the biometric signal corresponding to the vibration signal from the user and convert the biometric signal into a receive signal of an electrical signal, wherein the biometric signal is a frequency-based signal modified to include the anatomical feature information while the vibration signal passes through at least a portion of a body of the user.