Device for transmitting authentication information by using ultrasonic waves

An authentication information transmission device for transmitting authentication information using ultrasonic waves to minimize the occurrence of errors at a receiving side when the authentication information is transmitted using an inaudible frequency, the device comprising:

• a storage unit configured to store authentication information, frequency information corresponding to letters or numbers included in the authentication information, and a number of times a repetition of frequency corresponding to a number of times a consecutively arranged letter or number included in the authentication information;
• a control unit configured to generate sound wave signals with frequencies corresponding to the letters or numbers included in the authentication information;
• and
• a sound wave output unit configured to output the sound wave signals,
• wherein the control unit repeatedly generates the sound wave signals for several periods with the frequencies corresponding to the letters or numbers included in the authentication information in the order in which the letters or numbers are arranged, and
• wherein the number of times a repetition of frequency corresponding to the number of times a consecutively arranged letter or number is included in the authentication information.