# US 11,308,199 B2 · User authentication method using ultrasonic waves

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- Number: US 11,308,199 B2
- Document ID: US11308199B2
- Status: Granted
- Kind: B2
- Application number: 17/297,662
- Filed: 2020-05-29
- Published: 2021-11-18
- Granted: 2022-04-19
- Earliest claimed: 2019-06-04
- Assignees: Muzlive Inc.
- Applicants: Muzlive Inc.
- Inventors: Jong Sung Park
- Web page: https://patentgrep.com/patent/US11308199B2

## CPC

- G06F 21/32: using biometric data, e.g. fingerprints, iris scans or voiceprints
- G06F 21/45: Structures or tools for the administration of authentication
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)

## Abstract

A user authentication method using ultrasonic waves is disclosed. The user authentication method using ultrasonic waves, according to an embodiment of the present invention, comprises the steps of: receiving a sound wave signal which includes analog data; sampling the sound wave signal at a preset sampling rate; generating a block by selecting a preset number of pieces of sampling data; converting sampled data included in the block into frequency components; and determining, as digital data in the block, a letter or number corresponding to the frequency component having the largest magnitude from among the frequency components.

## Claims

### Claim 1

A user authentication method using ultrasonic waves, the user authentication method comprising:
receiving a sound wave signal, which is analog data;
sampling the sound wave signal at a preset sampling rate;
generating a block having a plurality of frequency components by selecting a preset number of pieces of sampling data;
converting the sampling data included in the block into the plurality of frequency components and calculating an amplitude of each frequency component; and
confirming a letter or number corresponding to a frequency component with the largest amplitude among the plurality of frequency components as digital data in the block.

### Claim 2 (depends on 1)

The user authentication method of claim 1, wherein the generating of a block having a plurality of frequency components by selecting a preset number of pieces of sampling data comprises dividing the sound wave signal at the same time intervals and sampling a sound wave signal included in a divided time domain at the preset sampling rate such that a preset number of pieces of sampling data are included in the block.

### Claim 3 (depends on 1)

The user authentication method of claim 1, wherein the converting of the sampling data included in the block into the plurality of frequency components comprises:
calculating a measurement duration, which is obtained by dividing the sampling rate by the number of pieces of data included in the block, and determining a reciprocal value of the measurement duration as a frequency interval; and
detecting an amplitude of each frequency component on a frequency interval basis.

### Claim 4 (depends on 3)

The user authentication method of claim 3, wherein the confirming of a letter or number corresponding to a frequency component with the largest amplitude among the plurality of frequency components as digital data in the block comprises confirming the digital data in the block using a mapping table storing a correspondence relationship of a letter or number included in the authentication information, wherein a frequency corresponding to a letter or number of the mapping table is set as a reciprocal interval of the measurement duration.

### Claim 5 (depends on 1)

The user authentication method of claim 1, further comprising:
determining a preset frequency signal repeated a preset number of times as a prerequisite signal when the signal of the preset frequency is repeated the preset number of times; and
confirming digital data in a block as authentication information after the prerequisite signal.

### Claim 6 (depends on 5)

The user authentication method of claim 5, wherein the prerequisite signal is a signal for identifying when the authentication information is received and for synchronizing the transmission timing with an authentication device.