# US 12,602,495 B2 · Authentication information transmission device using inaudible sound wave communication > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,602,495 B2 - Document ID: US12602495B2 - Status: Granted - Kind: B2 - Application number: 18/022,321 - Filed: 2020-11-23 - Published: 2023-10-12 - Granted: 2026-04-14 - Earliest claimed: 2020-09-03 - Assignees: Muzlive Inc. - Applicants: Muzlive Inc. - Inventors: Jong Sung Park - Web page: https://patentgrep.com/patent/US12602495B2 ## CPC - G06F 21/606: {by securing the transmission between two devices or processes} - G06F 21/35: communicating wirelessly - G06F 21/45: Structures or tools for the administration of authentication - G06F 21/60: Protecting data - H04B 11/00: Transmission systems employing ultrasonic, sonic or infrasonic waves - G06F 21/31: User authentication - H04L 27/10: Frequency-modulated carrier systems, i.e. using frequency-shift keying (H04L27/32 takes precedence) - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) - H04B: TRANSMISSION - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract An authentication device includes a storage unit for storing authentication information and a plurality of precondition signals corresponding to conversion methods for converting the authentication information into sound waves; a control unit for selecting at least one precondition signal from among the plurality of precondition signals, and converting the authentication information into a sound wave signal by means of a conversion method corresponding to the selected precondition signal; and a sound wave output unit for outputting, as a sound wave signal, the selected precondition signal and the authentication information which has been converted into a sound wave signal. ## Claims ### Claim 1 An authentication device comprising: storage circuitry configured to store authentication information, and a plurality of preamble signals corresponding to a conversion method of converting the authentication information into sound waves; control circuitry configured to select at least one preamble signal from among the plurality of preamble signals and convert the authentication information into a sound wave signal by using a conversion method corresponding to the selected preamble signal; and sound wave output circuitry configured to output, as a sound wave signal, the selected preamble signal and the authentication information converted into the sound wave signal, wherein the storage circuitry stores a mapping table regarding a frequency of a sound wave signal corresponding to a character or a number for each of the plurality of preamble signals, and wherein the control circuitry converts the authentication information into a sound wave signal by using a first method corresponding to a first preamble signal when the first preamble signal is selected from among the plurality of preamble signals stored in the storage circuitry, and converts the authentication information into a sound wave signal by using a second method corresponding to a second preamble signal when the second preamble signal is selected. ### Claim 2 (depends on 1) The authentication device according to claim 1, wherein the control circuitry generates a different sound wave signal for each preamble signal selected for the same authentication information. ### Claim 3 (depends on 1) The authentication device according to claim 1, wherein the control circuitry sequentially or randomly selects the plurality of preamble signals stored in the storage circuitry, and converts the authentication information into the sound wave signal by using a conversion method corresponding to the selected preamble signal. ### Claim 4 (depends on 3) The authentication device according to claim 3, wherein the storage circuitry stores information on a selection order of the preamble signals. ### Claim 5 (depends on 4) The authentication device according to claim 4, wherein the control circuitry selects one of the plurality of preamble signals, converts the authentication information into a sound wave signal by using a conversion method corresponding to the selected preamble signal, and stores information on the selected preamble signal. ### Claim 6 (depends on 5) The authentication device according to claim 5, wherein the control circuitry selects a preamble signal corresponding to a next turn subsequent to a preamble signal previously selected in the selection order when an authentication information transmission command is received again. ### Claim 7 An authentication method for an authentication system including an authentication device, a user terminal device, and a management server, the authentication method comprising: selecting, by the authentication device, a preamble signal, converting authentication information into a sound wave signal by using a conversion method corresponding to the selected preamble signal, and transmitting the sound wave signal to the user terminal device; transmitting, by the user terminal device receiving the sound wave signal, an authentication information retransmission request signal to the authentication device; selecting, by the authentication device, a preamble signal corresponding to a next turn subsequent to a preamble signal previously selected in a pre-stored preamble signal selection order, converting the authentication information into a sound wave signal by using a conversion method corresponding to the selected preamble signal, and retransmitting the sound wave signal to the user terminal device; determining, by the user terminal device, whether or not the preamble signal included in the sound wave signal is a preamble signal in the pre-stored preamble signal selection order; and transmitting, by the user terminal device, the authentication information retransmission request signal to the authentication device when a determination is made that a preamble signal not in the selection order is included in the sound wave signal, and converting the authentication information in the form of a sound wave signal into digital information, and transmitting the authentication information to the management server when a determination is made that the preamble signal in the selection order is included.