# US 12,224,806 B2 · Method and device for recognizing a user > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,224,806 B2 - Document ID: US12224806B2 - Status: Granted - Kind: B2 - Application number: 17/416,839 - Filed: 2019-12-19 - Published: 2022-03-17 - Granted: 2025-02-11 - Earliest claimed: 2018-12-21 - Assignees: Orange - Applicants: Orange - Inventors: Aymeric De La Forest Divonne; Philippe Levionnais - Web page: https://patentgrep.com/patent/US12224806B2 ## CPC - H04B 13/005: {Transmission systems in which the medium consists of the human body} - G06F 21/34: involving the use of external additional devices, e.g. dongles or smart cards - G06V 40/15: {Biometric patterns based on physiological signals, e.g. heartbeat, blood flow} - H04B: TRANSMISSION - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) - G06V: IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING ## Abstract A method for recognising a user whose body is capable of re-transmitting an electromagnetic signal in the form of an electromagnetic wave. The method is implemented on a transceiver device and includes the following steps on the device: transmitting an electromagnetic pulse signal; obtaining a re-transmitted signal when the user is in the vicinity of the device, the signal depending on the transmitted pulse signal; comparing the re-transmitted signal with at least one reference signal of the user; and recognising the user if the re-transmitted signal is close to the reference signal. ## Claims ### Claim 1 A recognition method for recognizing a user, the method being implemented on a transceiver device and comprising the following acts implemented on the transceiver device: transmitting a pulsed electromagnetic signal; receiving, by a near field communication (NFC) antenna of the transceiver device in an intra-body communication (IBC) mode, a retransmitted signal retransmitted by his or her body when the user is in proximity to the transceiver device, said retransmitted signal being dependent on the pulsed electromagnetic signal transmitted; comparing the retransmitted signal with at least one reference signal of the user by measuring a distance between the retransmitted signal and the at least one reference signal; and recognizing the user if the measured distance is below a threshold. ### Claim 2 (depends on 1) The recognition method as claimed in claim 1, wherein the recognizing is followed by updating the at least one reference signal of the user by taking the retransmitted signal into account. ### Claim 3 (depends on 1) The recognition method as claimed in claim 1, wherein the recognizing is followed by unlocking the transceiver device. ### Claim 4 (depends on 1) The recognition method as claimed in claim 1, wherein the recognizing is followed by authorizing a transaction. ### Claim 5 (depends on 1) The recognition method as claimed in claim 1, wherein said at least one reference signal is associated with an identifier of the user and wherein the recognizing is followed by selecting the user recognized by his or her identifier. ### Claim 6 (depends on 1) The recognition method as claimed in claim 1, wherein the method comprises, before comparing the retransmitted signal with the at least one reference signal of the user: digitizing the received retransmitted signal; and standardizing the digitized retransmitted signal. ### Claim 7 (depends on 1) The recognition method as claimed in claim 1, wherein the method comprises, in response to the measured distance being above the threshold: acquiring a third signal; calculating an average distance between the third signal, the retransmitted signal and the at least one reference signal; and recognizing the user if the average distance is below the threshold. ### Claim 8 A method for learning a signature of a user in order for him or her to be recognized, the method comprising the following acts implemented on the transceiver device: transmitting at least one pulsed electromagnetic signal; receiving, by a near field communication (NFC) antenna of the transceiver device in an intra-body communication (IBC) mode, at least one signal retransmitted by his or her body when the user is in proximity to the transceiver device, said at least one retransmitted signal being dependent on the pulsed electromagnetic signal transmitted; generating a reference signal, called a signature, as a function of said at least one retransmitted signal obtained; and saving said reference signal as signature of the user. ### Claim 9 (depends on 8) The method for learning a signature of a user as claimed in claim 8, wherein the reference signal is saved in association with an identifier of the user. ### Claim 10 (depends on 8) The method for learning a signature of a user as claimed in claim 8, wherein the reference signal depends also on a validation motion executed by the user when he or she approaches the transceiver device. ### Claim 11 A device for recognizing a user, wherein the device comprises: a near field communication (NFC) antenna; and a processor configured to: transmit a pulsed electrical signal using the NFC antenna; receive, by the NFC antenna in an intra-body communication (IBC) mode, a retransmitted signal retransmitted by his or her body when the user is in proximity to the device, said retransmitted signal being dependent on the pulsed electromagnetic signal transmitted; compare the retransmitted signal with at least one reference signal of the user by measuring a distance between the retransmitted signal and the at least one reference signal; and recognize the user if the measured distance is below a threshold. ### Claim 12 A mobile terminal or access control device comprising: a transceiver device comprising: a near field communication (NFC) antenna; and a processor configured to: transmit a pulsed electrical signal using the NFC antenna; receive, by the NFC antenna in an intra-body communication (IBC) mode, a retransmitted signal retransmitted by his or her body when the user is in proximity to the device, said retransmitted signal being dependent on the pulsed electromagnetic signal transmitted; and compare the retransmitted signal with a reference signal of the user by measuring a distance between the retransmitted signal and the reference signal; and recognize the user based on whether the measured distance is below a threshold. ### Claim 13 A transceiver device for learning a signature of a user, wherein the transceiver device comprises: a near field communication (NFC) antenna; and a processor configured to: transmit a pulsed electrical signal using the NFC antenna; receive, by the NFC antenna in an intra-body communication (IBC) mode, a retransmitted signal retransmitted by his or her body when the user is in proximity to the transceiver device, said retransmitted signal being dependent on the pulsed electrical signal; and generate a reference signal, called signature, as a function of said retransmitted signal received and save said reference signal as signature of the user. ### Claim 14 A mobile terminal or access control device for learning a signature of a user, said mobile terminal or access control device comprising: a transceiver device comprising: a near field communication (NFC) antenna; and a processor configured to: transmit a pulsed electrical signal using the NFC antenna; receive, by the NFC antenna in an intra-body communication (IBC) mode, a retransmitted signal retransmitted by his or her body when the user is in proximity to the transceiver device, said retransmitted signal being dependent on the pulsed electrical signal; and generate a reference signal, called signature, as a function of said retransmitted signal received and save said reference signal as signature of the user. ### Claim 15 A non-transitory computer-readable medium comprising a computer program stored thereon comprising instructions for implementing method for recognizing a user, when the program is executed by a processor of a transceiver device, wherein the instructions configure the transceiver device to: transmit a pulsed electromagnetic signal; receive, by a near field communication (NFC) antenna of the transceiver device in an intra-body communication (IBC) mode, a retransmitted signal retransmitted by his or her body when the user is in proximity to the transceiver device, said retransmitted signal being dependent on the pulsed electromagnetic signal transmitted; compare the retransmitted signal with at least one reference signal of the user by measuring a distance between the retransmitted signal and the at least one reference signal; and recognize the user if the measured distance is below a threshold. ### Claim 16 (depends on 11) The mobile terminal as claimed in claim 11, wherein the recognizing is followed by updating the at least one reference signal of the user by taking the retransmitted signal into account. ### Claim 17 (depends on 11) The mobile terminal as claimed in claim 11, wherein the recognizing is followed by unlocking the transceiver device. ### Claim 18 (depends on 11) The mobile terminal as claimed in claim 11, wherein the recognizing is followed by authorizing a transaction. ### Claim 19 (depends on 11) The mobile terminal as claimed in claim 11, wherein said at least one reference signal is associated with an identifier of the user and wherein recognize the user is followed by selecting the recognized user by his or her identifier. ### Claim 20 (depends on 11) The mobile terminal as claimed in claim 11, wherein the processor is configured to, in response to the distance being above a threshold: acquire a third signal; calculate an average distance between the third signal, the retransmitted signal and the at least one reference signal; and recognize the user if the average distance is below the threshold.