Sound wave payment system, magnetic field conversion device, and mobile terminal for sound wave payment technical field

1. A mobile terminal comprising:

an inputter configured to receive a user input for selecting card information;

a communicator configured to receive a token number indicating a physical card from a card company server, when a token issuance corresponding to card information selected by the user input is approved;

a processor configured to generate token information including the token number and an identification code indicating a target service provider for identification of a service provider; and

a sound wave outputter configured to output a sound wave signal converted from the generated token information and to transfer the sound wave signal to a magnetic field conversion device.

2. The mobile terminal of claim 1 , wherein the processor is configured to convert the token information to a sound wave signal based on a single data frame that includes a number of slots greater than or equal to a number count of the identification code and a number count of the token number.

3. The mobile terminal of claim 1 , wherein in response to a volume level set in the sound wave outputter being less than or equal to a threshold volume level, the processor is configured to increase a volume level of the sound wave outputter to a target volume level.

4. The mobile terminal of claim 3 , wherein the processor is configured to temporarily increase the volume level of the sound wave outputter to the target volume level and to restore the volume level of the sound wave outputter back to the original volume level.

5. The mobile terminal of claim 3 , wherein the processor is configured to maintain the volume level of the sound wave outputter at the target volume level during a time length including a period from an output start time of the sound wave signal to an output end time of the sound wave signal.

6. The mobile terminal of claim 3 , wherein in response to at least a portion of a sound band of a sound source being reproduced by the sound wave outputter overlapping a sound band assigned to the sound wave signal, the processor is configured to interrupt reproduction of the sound source.

7. The mobile terminal of claim 3 , wherein in response to a sound band of a sound source being reproduced by the sound wave outputter not overlapping a sound band assigned to the sound wave signal, the processor is configured to allow the sound source to continue to be reproduced.

8. The mobile terminal of claim 3 , wherein in response to the volume level being temporarily increased for output of the sound wave signal, the processor is configured to limit a display output of an interface related to a volume control.

9. The mobile terminal of claim 1 , wherein

the processor is configured to obtain device setting information comprising a device setting code, device setting data, and an identification code that indicates a target service provider, and

the sound wave outputter is configured to output a sound wave signal converted from the device setting information to change device settings of the magnetic field conversion device.

10. The mobile terminal of claim 9 , wherein the device setting data comprises a setting value for at least one of a waiting time, a token transmission interval, a token transmission time length, a sound wave reception distance, a sound outputter setting value, a magnetic field generation interval per bit, a preamble, and a test mode.

11. A magnetic field conversion device comprising:

a sound wave receiver configured to receive a sound wave signal to be output by a mobile terminal;

a processor configured to convert token information to a series of binary values, in response to the received sound wave signal comprising the token information and an identification code of the token information indicating a target service provider assigned to the magnetic field conversion device; and

a magnetic field outputter configured to generate a magnetic field signal in which a magnetic field direction is alternately changed, to perform payment based on the token information, in response to a supply of current corresponding to the series of binary values.

12. The magnetic field conversion device of claim 11 , wherein the sound wave receiver is configured to receive a sound wave signal corresponding to the token information of a single data frame that includes a number of slots greater than or equal to a number count of the identification code and a number count of the token number.

13. The magnetic field conversion device of claim 11 , wherein the processor is configured to convert a token number included in the token information to track data of a credit card and to convert the track data to the series of binary values.

14. The magnetic field conversion device of claim 11 , further comprising:

a power supply configured to provide a current pulse to a coil of the magnetic field outputter while alternately changing a current direction,

wherein the magnetic field outputter comprises the coil comprising a ferrite core and a winding enclosing the ferrite core, and

wherein the coil is configured to generate a magnetic field signal of a magnetic field direction corresponding to the current direction in response to a supply of the current pulse.

15. The magnetic field conversion device of claim 14 , wherein the power supply is configured to provide the current pulse to the coil at a first pulse interval with respect to a first bit value, and to provide the current pulse to the coil at a second pulse interval with respect to a second bit value.

16. The magnetic field conversion device of claim 15 , wherein the second pulse interval is half of the first pulse interval.

17. The magnetic field conversion device of claim 15 , wherein

the power supply is configured to apply current pulses of opposite current directions to the coil at a start time and an end time of a period corresponding to the first bit value, and to disable the current pulses during a period between the start time and the end time, and

the power supply is configured to apply a current pulse of a first current direction to the coil at a start time and an end time of a period corresponding to the second bit value, and to apply a current pulse of a second current direction opposite to the first current direction during a period between the start time and the end time.

18. The magnetic field conversion device of claim 14 , wherein a pulse width of the current pulse is less than a pulse interval.

19. The magnetic field conversion device of claim 11 , wherein the magnetic field conversion device is attachable to at least one of a merchant terminal and the mobile terminal.

20. The magnetic field conversion device of claim 11 , wherein in response to a device setting code being identified from the received sound wave signal, the processor is configured to extract device setting data from the sound wave signal and to change device settings of the magnetic field conversion device.