Processing device, mobile terminal, processing method, and program.

Abstract

To provide a processing device, a mobile terminal, a processing method, and a program capable of reducing the possibility of forgetting to take change. [Solution] The processing device includes a sound detection unit that detects a first sound of a product being processed at a self-checkout register and a second sound indicating the receipt of change at the self-checkout register, and detects the volume of the second sound, a comparison unit that, when the sound detection unit detects the second sound again after detecting the first sound and the second sound, compares the first volume of the second sound previously detected by the sound detection unit with the second volume of the second sound currently detected by the sound detection unit, and an output unit that outputs an alarm if the second volume is smaller than the first volume.

Description

[Technical field]

[0001] The present disclosure relates to a processing device, a mobile terminal, a processing method, and a program. [Background technology]

[0002] In stores where self-checkout registers (automatic payment machines) are installed, customers can use the self-checkout register to make payments. When change is due, the self-checkout register notifies the customer that change is due by making a sound or displaying a message. If the customer does not notice the sound or message, there is a possibility that the customer will forget to take the change.

[0003] For example, Patent Document 1 describes a device that prevents customers from forgetting to take their change. The device detects the customer's line of sight, and if the customer's line of sight is not directed toward the change outlet, displays information indicating that there is change. The device also detects whether the change has been removed from the outlet, and if the change has not been removed, outputs an alarm. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2016-212459 A Summary of the Invention [Problem to be solved by the invention]

[0005] The device described in Patent Document 1 can prompt customers in the vicinity of the device to receive their change. However, if a customer leaves the device without noticing the information display or the alarm sound, the device cannot notify the customer that they have change.

[0006] An object of the present disclosure is to provide a processing device, a mobile terminal, a processing method, and a program that solve the above-mentioned problems. [Means for solving the problem]

[0007] A processing device according to one embodiment of the present disclosure includes a sound detection unit that detects a first sound of a product being processed at a self-checkout register and a second sound indicating the receipt of change at the self-checkout register, and detects the volume of the second sound, a comparison unit that, when the sound detection unit detects the second sound again after detecting the first sound and the second sound, compares the first volume of the second sound previously detected by the sound detection unit with the second volume of the second sound currently detected by the sound detection unit, and an output unit that outputs an alarm if the second volume is smaller than the first volume.

[0008] A processing method according to one embodiment of the present disclosure includes a step in which a sound detection unit detects a first sound of a product being checked out at a self-checkout register and a second sound indicating the receipt of change at the self-checkout register, and detects the volume of the second sound; a step in which, when the sound detection unit detects the second sound again after detecting the first sound and the second sound, a comparison unit compares the first volume of the second sound previously detected by the sound detection unit with the second volume of the second sound currently detected by the sound detection unit; and a step in which an output unit outputs an alarm if the second volume is smaller than the first volume.

[0009] A program according to one embodiment of the present disclosure causes a computer to execute the steps of detecting a first sound of a product being checked out at a self-checkout register and a second sound indicating the receipt of change at the self-checkout register, and detecting the volume of the second sound; when the second sound is detected again after detecting the first sound and the second sound, comparing the first volume of the second sound detected previously with the second volume of the second sound detected this time; and outputting an alarm if the second volume is lower than the first volume. Effect of the Invention

[0010] According to the above aspect, the possibility of forgetting to take change can be reduced. [Brief description of the drawings]

[0011] [Figure 1] FIG. 2 is a hardware configuration diagram of a mobile terminal according to the present disclosure. [Diagram 2] FIG. 2 is a functional block diagram of a mobile terminal according to the present disclosure. [Diagram 3] 5 is a flowchart illustrating an operation of a mobile terminal according to the present disclosure. [Figure 4] 5 is a flowchart illustrating an operation of a mobile terminal according to the present disclosure. [Diagram 5] FIG. 2 is a functional block diagram of a mobile terminal according to the present disclosure. [Figure 6] FIG. 2 is a functional block diagram of a processing device according to the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, each embodiment will be described with reference to the drawings. In all the drawings, the same or corresponding components are denoted by the same reference numerals, and common descriptions will be omitted.

[0013] <First embodiment> Hereinafter, an embodiment according to the present disclosure will be described with reference to the drawings. Fig. 1 shows a hardware configuration of a mobile terminal 10 according to the present embodiment. For example, the mobile terminal 10 is an electronic device such as a smartphone or a tablet terminal.

[0014] The mobile terminal 10 is a computer equipped with various hardware components, such as a CPU (Central Processing Unit) 101, a ROM (Read Only Memory) 102, a RAM (Random Access Memory) 103, other storage devices 104, a microphone 105, a display 106, and a speaker 107.

[0015] 2 shows a functional configuration of the mobile terminal 10. The mobile terminal 10 includes a processing unit 11, which includes a main control unit 20, a timer 30, a storage unit 40, a sound detection unit 50, and an output unit 60.

[0016] The main control unit 20 controls the entire processing device 11. The timer 30 measures time. The memory unit 40 is a non-volatile memory medium such as a flash memory. The sound detection unit 50 detects sounds generated by the self-checkout. The output unit 60 outputs an alarm to prompt the customer to receive their change.

[0017] The storage unit 40 stores an application (hereinafter, referred to as an app) 41, a sound table 42, a timer table 43, and volume data 44. The app 41 is a program for executing a process to prompt a customer to receive change. The sound table 42 includes sound data of a first sound generated when various self-checkout registers read a code attached to a product to perform a transaction, and sound data of a second sound generated by various self-checkout registers to notify a customer that change is available. The code attached to the product includes information such as the product name and price. The self-checkout register generates the second sound at a certain volume. The timer table 43 includes a timer value corresponding to a predetermined time during which various self-checkout registers continue to generate the second sound. The volume data 44 indicates the volume of the second sound detected by the sound detection unit 50. If the sound detection unit 50 detects the second sound multiple times, the storage unit 40 stores multiple pieces of volume data 44.

[0018] The sound detection unit 50 includes a microphone 51 and a microphone control unit 52. The microphone 51 detects sounds generated outside the mobile terminal 10. The microphone control unit 52 controls the microphone 51.

[0019] The output unit 60 includes a display 61, a display control unit 62, a speaker 63, and a speaker control unit 64. The display 61 is a display device such as a liquid crystal display, and displays information indicating an alarm to prompt the customer to receive the change. The display control unit 62 controls the display 61. The speaker 63 outputs an alarm sound to prompt the customer to receive the change. The speaker control unit 64 controls the speaker 63.

[0020] 3 and 4 are flowcharts showing the operation of the mobile terminal 10. The operation of the mobile terminal 10 will be described with reference to Fig. 3 and 4. The mobile terminal 10 starts the application 41. The main control unit 20, the microphone control unit 52, the display control unit 62, and the speaker control unit 64 execute the following processes in accordance with the application 41.

[0021] The microphone 51 detects a sound generated outside the mobile terminal 10, and outputs sound data corresponding to the volume of the sound to the microphone control unit 52. The microphone control unit 52 compares the sound data output from the microphone 51 with sound data of a first sound registered in the sound table 42 of the storage unit 40, and determines whether the microphone 51 has detected the first sound (step S101).

[0022] When the sound data output from the microphone 51 does not match the sound data of the first sound, the microphone control unit 52 determines that the microphone 51 has not detected the first sound. At this time, the microphone control unit 52 executes step S101 again.

[0023] When the sound data output from microphone 51 matches the sound data of the first sound, microphone control unit 52 determines that microphone 51 has detected the first sound. Microphone control unit 52 can detect that a customer is making a transaction using a self-checkout. At this time, microphone control unit 52 notifies main control unit 20 that the first sound has been generated. Microphone control unit 52 also compares the sound data output from microphone 51 with the sound data of the second sound registered in sound table 42 of storage unit 40, and determines whether microphone 51 has detected the second sound (step S102).

[0024] When the sound data output from the microphone 51 does not match the sound data of the second sound, the microphone control unit 52 determines that the microphone 51 has not detected the second sound. At this time, the microphone control unit 52 executes step S102 again.

[0025] When the sound data output from microphone 51 matches the sound data of the second sound, microphone control unit 52 determines that microphone 51 has detected the second sound. Microphone control unit 52 can detect that there is change. At this time, microphone control unit 52 notifies main control unit 20 that the second sound has been generated. Also, microphone control unit 52 measures the volume of the second sound based on the sound data output from microphone 51, and notifies main control unit 20 of the volume. Main control unit 20 stores volume data 44 indicating the volume of the second sound in memory unit 40 (step S103).

[0026] After step S103, the main control unit 20 obtains the timer value from the timer table 43 in the storage unit 40, and sets the timer value in the timer 30. The timer 30 starts a timer operation for measuring time (step S104).

[0027] When the pattern of the first sound or the second sound differs depending on the type of the self-checkout register, the sound table 42 in the storage unit 40 may include identification information corresponding to the type of the self-checkout register. The identification information is associated with the sound data of the first sound or the second sound. The main control unit 20 may obtain, from the sound table 42, the identification information associated with the sound data of the first sound or the second sound that matches the sound data output from the microphone 51.

[0028] The timer table 43 may include the above-mentioned identification information associated with the timer value. The main control unit 20 may obtain from the timer table 43 a timer value associated with the same identification information as the identification information obtained from the sound table 42. If the predetermined time during which the second sound continues to be generated varies depending on the type of self-checkout register, the main control unit 20 can obtain a timer value corresponding to the type of self-checkout register.

[0029] A code corresponding to the type of self-checkout may be attached to the surface of the self-checkout. Alternatively, the self-checkout may display the code on its display. If the mobile terminal 10 has a camera, the main control unit 20 may detect the code from an image captured by the camera and obtain the identification information from the code.

[0030] After starting the timer operation, the timer 30 notifies the main control unit 20 of a timeout when a predetermined time corresponding to the timer value has elapsed. After step S104, the main control unit 20 determines whether the timer 30 has timed out, thereby determining whether the predetermined time has elapsed (step S105). If the timer 30 has timed out, the predetermined time has elapsed, and the process proceeds to step S106. If the timer 30 has not timed out, the predetermined time has not elapsed, and the process proceeds to step S107.

[0031] If the predetermined time has not elapsed, the main control unit 20 instructs the microphone control unit 52 to detect the second sound. The microphone control unit 52 executes the same process as in step S102, and determines whether the microphone 51 has detected the second sound (step S107).

[0032] If the microphone 51 has not detected the second sound, the process proceeds to step S112. If the microphone 51 has detected the second sound, the microphone control unit 52 notifies the main control unit 20 that the second sound has occurred. The microphone control unit 52 also measures the volume of the second sound based on the sound data output from the microphone 51, and notifies the main control unit 20 of the volume. The main control unit 20 stores volume data 44 indicating the volume of the second sound in the storage unit 40 (step S108).

[0033] In steps S103 and S108, the main control unit 20 may associate order information indicating the order in which the volume data 44 was generated with the volume data 44, and store the order information in the storage unit 40. For example, the order information is a sequence number or time information. Based on the order information, the main control unit 20 can distinguish between the volume data 44 of the second sound previously detected by the microphone 51 and the volume data 44 of the second sound currently detected by the microphone 51.

[0034] The storage unit 40 may include a first storage area and a second storage area for storing the volume data 44. For example, when the microphone 51 detects the second sound for the first time, the main control unit 20 stores the volume data 44 of the second sound in the first storage area. When the microphone 51 detects the second sound for the second time, the main control unit 20 stores the volume data 44 of the second sound in the second storage area. Thereafter, every time the microphone 51 detects the second sound, the main control unit 20 stores the volume data 44 stored in the second storage area in the first storage area, and stores the volume data 44 of the second sound newly detected by the microphone 51 in the second storage area. The main control unit 20 can recognize the volume data 44 stored in the first storage area as the volume data 44 of the second sound previously detected by the microphone 51. Furthermore, the main control unit 20 can recognize the volume data 44 stored in the second storage area as the volume data 44 of the second sound currently detected by the microphone 51.

[0035] After step S108, the main control unit 20 compares the first volume indicated by the volume data 44 of the second sound previously detected by the microphone 51 with the second volume indicated by the volume data 44 of the second sound currently detected by the microphone 51. The main control unit 20 determines whether the second volume is smaller than the first volume (step S109).

[0036] If the second volume is greater than the first volume, the process proceeds to step S111. If the second volume is less than the first volume, the process proceeds to step S105.

[0037] The mobile terminal 10 repeats steps S105, S107, S108, and S109 until the timer 30 times out. That is, the sound detection unit 50 repeatedly detects the second sound, and the main control unit 20 repeatedly compares the second volume for a preset period of time. By detecting that the volume of the second sound is gradually decreasing, the mobile terminal 10 can detect that the customer has left the self-checkout without receiving the change.

[0038] When the timer 30 times out and a predetermined time has elapsed, the main control unit 20 instructs the output unit 60 to output an alarm to prompt the customer to receive the change. The output unit 60 outputs the alarm (step S106).

[0039] Details of step S106 will be described below. The main control unit 20 instructs the display control unit 62 to display information indicating the warning. The display control unit 62 holds in advance a table in which image data for displaying the information indicating the warning is registered. When the main control unit 20 instructs the display control unit 62 to display the information indicating the warning, the display control unit 62 outputs the image data to the display 61. The display 61 displays the information indicating the warning based on the image data.

[0040] Furthermore, the main control unit 20 instructs the speaker control unit 64 to output an alarm sound. The speaker control unit 64 holds in advance a table in which sound data of the alarm sound is registered. When the main control unit 20 instructs the speaker control unit 64 to output an alarm sound, the speaker control unit 64 outputs the sound data of the alarm sound to the speaker 63. The speaker 63 outputs the alarm sound based on the sound data.

[0041] The speaker 63 may output an audible alarm without the display 61 displaying information indicating an alarm. Alternatively, the display 61 may display information indicating an alarm without the speaker 63 outputting an audible alarm. Alternatively, the display 61 may display information indicating an alarm, and at the same time the speaker 63 may output an audible alarm.

[0042] If the second volume is greater than the first volume in step S109, the microphone control unit 52 determines whether the second sound has stopped, and notifies the main control unit 20 of the determination result (step S111).

[0043] If the second sound has not stopped, the process proceeds to step S105. If the second sound has stopped, the main control unit 20 determines whether the timer 30 has timed out, thereby determining whether a predetermined time has elapsed (step S112). If the timer 30 has timed out, the predetermined time has elapsed, and the process ends. If the timer 30 has not timed out, the predetermined time has not elapsed, and the process proceeds to step S113.

[0044] If the predetermined time has not elapsed, the main control unit 20 determines that the customer has received the change, and causes the timer 30 to stop the timer operation (step S113). In this case, the output unit 60 does not output an alarm, and stops outputting the alarm.

[0045] As described above, the main control unit 20 compares the first volume of the second sound previously detected by the sound detection unit 50 with the second volume of the second sound currently detected by the sound detection unit 50. If the second volume is smaller than the first volume, the output unit 60 outputs an alarm. The mobile terminal 10 can determine that a customer has left the self-checkout without receiving the change, and by outputting an alarm, the possibility of the customer forgetting to take the change can be reduced.

[0046] The sound detection unit 50 repeatedly detects the second sound. The main control unit 20 repeatedly compares the first volume and the second volume for a preset time. This allows the mobile terminal 10 to accurately detect that a customer has left the self-checkout without receiving change.

[0047] After the second volume remains lower than the first volume for a preset time, the output unit 60 outputs an alarm. Since there is a possibility that a customer will notice the second sound and receive the change, the mobile terminal 10 can avoid outputting an alarm unnecessarily by outputting an alarm after a preset time has elapsed.

[0048] If the sound detection unit 50 stops detecting the second sound before the preset time has elapsed, the output unit 60 stops outputting the alarm. By stopping the output of the alarm when the customer has received the change, the mobile terminal 10 can avoid outputting unnecessary alarms.

[0049] <Second embodiment> Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings. Fig. 5 shows a functional configuration of a mobile terminal 10a according to this embodiment. The mobile terminal 10a includes a processing unit 11a, which includes a main control unit 20, a timer 30, a storage unit 40, a sound detection unit 50, and an output unit 60a.

[0050] The output unit 60a includes a display 61, a display control unit 62, a speaker 63, a speaker control unit 64, a motor 65, and a motor control unit 66. The motor 65 generates vibrations that indicate an alarm to prompt the customer to receive the change. The motor control unit 66 controls the motor 65.

[0051] The mobile terminal 10a executes the processes shown in Fig. 3 and Fig. 4. Processes other than the above-mentioned processes will be described.

[0052] In step S106, the main control unit 20 instructs the motor control unit 66 to generate a vibration indicating an alarm. The motor control unit 66 holds in advance a table in which vibration data indicating an alarm is registered. When the main control unit 20 instructs the motor control unit 66 to generate a vibration indicating an alarm, the motor control unit 66 outputs the vibration data indicating an alarm to the motor 65. The motor 65 generates a vibration based on the vibration data.

[0053] When display 61 displays information indicating an alarm, there is a possibility that the customer will not notice the alarm because he or she does not look at display 61. Furthermore, in public places, if speaker 63 outputs an alarm sound at a high volume, it may be a nuisance to people around the customer, so the volume of speaker 63 may be limited. Therefore, even if speaker 63 outputs an alarm sound when there is a lot of noise around the customer, the customer may not notice the alarm sound. Since mobile terminal 10a notifies the customer that change is due by vibration, it is possible to more reliably make the customer realize that they have forgotten to take the change.

[0054] <Third embodiment> Hereinafter, an embodiment according to the present disclosure will be described with reference to the drawings. Fig. 6 shows the functional configuration of a processing device 11b according to this embodiment. The processing device 11b includes a main control unit 20 (comparison unit), a sound detection unit 50b, and an output unit 60b.

[0055] The sound detection unit 50b detects a first sound of a product being processed at the self-checkout and a second sound indicating the receipt of change at the self-checkout, and detects the volume of the second sound. When the sound detection unit 50 detects the second sound again after detecting the first and second sounds, the main control unit 20 compares the first volume of the second sound previously detected by the sound detection unit 50 with the second volume of the second sound currently detected by the sound detection unit 50. If the second volume is smaller than the first volume, the output unit 60b outputs an alarm.

[0056] By being provided with the above-mentioned configuration, the processor 11b can reduce the possibility of forgetting to take the change.

[0057] Although the present disclosure has been described above with reference to the embodiments, the present disclosure is not limited to the above-mentioned embodiments. Various modifications that can be understood by a person skilled in the art can be made to the configuration and details of the present disclosure within the scope of the present disclosure. Furthermore, each embodiment can be appropriately combined with other embodiments.

[0058] A part or all of the above-described embodiments may be described as, but is not limited to, the following supplementary notes.

[0059] (Appendix 1) a sound detection unit that detects a first sound of a product transaction at a self-checkout register and a second sound of a change being provided at the self-checkout register, and detects the volume of the second sound; a comparison unit that, when the sound detection unit detects the second sound again after detecting the first sound and the second sound, compares a first volume of the second sound previously detected by the sound detection unit with a second volume of the second sound currently detected by the sound detection unit; an output unit that outputs an alarm when the second volume is smaller than the first volume; Equipped with Processing unit.

[0060] (Appendix 2) The sound detection unit repeatedly detects the second sound, The comparison unit repeatedly compares the first volume with the second volume for a preset time. 2. The processing device of claim 1.

[0061] (Appendix 3) After the second volume continues to be lower than the first volume during the period of time, the output unit outputs the alarm. 3. The processing device according to claim 2.

[0062] (Appendix 4) If the sound detection unit stops detecting the second sound before the time elapses, the output unit stops outputting the alarm. 4. The processing device according to claim 3.

[0063] (Appendix 5) The output unit includes a display unit that displays information indicating the warning. 5. The processing device according to claim 1 ,

[0064] (Appendix 6) The output unit includes a speaker that outputs a sound indicating the alarm. 6. The processing device of claim 1.

[0065] (Appendix 7) The output unit includes a motor that outputs a vibration indicating the alarm. 7. The processing device of any one of claims 1 to 6.

[0066] (Appendix 8) A mobile terminal comprising the processing device according to any one of claims 1 to 7.

[0067] (Appendix 9) a sound detection unit detecting a first sound of a product transaction at a self-checkout register and a second sound indicating the generation of change at the self-checkout register, and detecting the volume of the second sound; a comparison unit comparing, when the sound detection unit detects the second sound again after detecting the first sound and the second sound, a first volume of the second sound previously detected by the sound detection unit with a second volume of the second sound currently detected by the sound detection unit; an output unit outputting an alarm when the second volume is smaller than the first volume; Equipped with Processing methods.

[0068] (Appendix 10) The sound detection unit repeatedly detects the second sound, The comparison unit repeatedly compares the first volume with the second volume for a preset time. The processing method described in Appendix 9.

[0069] (Appendix 11) After the second volume continues to be lower than the first volume during the period of time, the output unit outputs the alarm. 10. The method of claim 10.

[0070] (Appendix 12) and a step of the output unit ceasing output of the alarm if the sound detection unit stops detecting the second sound before the time elapses. 12. The processing method according to claim 11.

[0071] (Appendix 13) The output unit displays information indicating the warning on a display unit. 13. The method of claim 9,

[0072] (Appendix 14) The output unit outputs a sound indicating the alarm from a speaker. 14. The method of claim 9,

[0073] (Appendix 15) The output unit outputs a vibration indicating the alarm from a motor. 15. The method of claim 9.

[0074] (Appendix 16) detecting a first sound indicating a transaction for an item at a self-checkout register and a second sound indicating the receipt of change at the self-checkout register, and detecting the volume of the second sound; a step of comparing a first volume of the second sound detected previously with a second volume of the second sound detected this time when the second sound is detected again after the first sound and the second sound have been detected; outputting an alarm if the second volume is lower than the first volume; A program for causing a computer to execute the following.

[0075] (Appendix 17) repeatedly detecting the second sound; repeatedly comparing the first volume with the second volume for a preset period of time; 17. The program according to claim 16.

[0076] (Appendix 18) outputting the warning after the second volume has remained lower than the first volume for the period of time; 18. The program according to claim 17.

[0077] (Appendix 19) and a step of ceasing output of the alarm if detection of the second sound is stopped before the time period has elapsed. 19. The program according to claim 18.

[0078] (Appendix 20) In the step of outputting the warning, information indicating the warning is displayed on a display unit. 20. The program of any one of appendixes 16 to 19.

[0079] (Appendix 21) In the step of outputting the alarm, a sound indicating the alarm is output from a speaker. 21. The program of any one of appendixes 16 to 20.

[0080] (Appendix 22) In the step of outputting the alarm, a vibration indicating the alarm is output from a motor. 22. The program of any one of appendixes 16 to 21. [Explanation of symbols]

[0081] 10,10a Mobile terminals 11, 11a, 11b Processing device 20 Main control section 30 Timer 40 Storage section 50, 50a, 50b Sound detection unit 51,105 Mike 52 Microphone control section 60, 60a, 60b Output section 61,106 Display 62 Display control unit 63,107 speakers 64 Speaker control unit 65 Motor 66 Motor control unit 101 CPU 102 ROM 103 RAM 104 Storage device

Claims

1. a sound detection unit that detects a first sound of a product transaction at a self-checkout register and a second sound of a change being provided at the self-checkout register, and detects the volume of the second sound; a comparison unit that, when the sound detection unit detects the second sound again after detecting the first sound and the second sound, compares a first volume of the second sound previously detected by the sound detection unit with a second volume of the second sound currently detected by the sound detection unit; an output unit that outputs an alarm when the second volume is smaller than the first volume; Equipped with Processing unit.

2. The sound detection unit repeatedly detects the second sound, The comparison unit repeatedly compares the first volume with the second volume for a preset time. The processing device of claim 1 .

3. After the second volume continues to be lower than the first volume for the period of time, the output unit outputs the warning. The processing device according to claim 2 .

4. If the sound detection unit stops detecting the second sound before the time elapses, the output unit stops outputting the alarm. The processing device according to claim 3 .

5. The output unit includes a display unit that displays information indicating the warning. The processing device according to claim 1 or 2.

6. The output unit includes a speaker that outputs a sound indicating the alarm. The processing device according to claim 1 or 2.

7. The output unit includes a motor that outputs a vibration indicating the alarm. The processing device according to claim 1 or 2.

8. A mobile terminal comprising the processing device according to claim 1 or 2.

9. a sound detection unit detecting a first sound of a product transaction at a self-checkout register and a second sound indicating the generation of change at the self-checkout register, and detecting the volume of the second sound; a comparison unit comparing, when the sound detection unit detects the second sound again after detecting the first sound and the second sound, a first volume of the second sound previously detected by the sound detection unit with a second volume of the second sound currently detected by the sound detection unit; an output unit outputting an alarm when the second volume is smaller than the first volume; Equipped with Processing methods.

10. detecting a first sound indicating a transaction for an item at a self-checkout register and a second sound indicating the receipt of change at the self-checkout register, and detecting the volume of the second sound; a step of comparing a first volume of the second sound detected previously with a second volume of the second sound detected this time when the second sound is detected again after the first sound and the second sound have been detected; outputting an alarm if the second volume is smaller than the first volume; A program for causing a computer to execute the following.

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