Information processing device, information processing method, and program

Abstract

To provide a technique that allows a reduction of costs required to control an output level.SOLUTION: An information processing device includes: an acquisition unit that obtains a first output level of a transmission signal at a first time and a second output level of a transmission signal at a second time that comes after the first time; an initial value determination unit that determines an initial value of the amount of attenuation of the transmission signal based on the first output level and the second output level; and a function control unit that activates an automatic control operation in which a first amount of attenuation of a first transmission signal is adjusted based on the initial value and also a second amount of attenuation of a second transmission signal that is transmitted after the first transmission signal is adjusted according to an output level of a third transmission signal that is transmitted before the second transmission signal.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an information processing device, an information processing method, and a program. [Background technology]

[0002] In recent years, techniques have become known for controlling the output level of a signal transmitted by a wireless communication device so as to maintain the output level at a constant level. For example, a technique for controlling the output level based on a temperature detected by a temperature sensor has been disclosed (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2010-74742 Summary of the Invention [Problem to be solved by the invention]

[0004] However, when the output level is controlled using a temperature sensor, the provision of the temperature sensor increases costs.

[0005] Therefore, the present invention has been made in consideration of the above problems, and an object of the present invention is to provide a technique that can reduce the cost required to control the output level. [Means for solving the problem]

[0006] In order to solve the above problem, according to one aspect of the present invention, there is provided an information processing device comprising: an acquisition unit that acquires a first output level of a transmission signal at a first time and a second output level of the transmission signal at a second time after the first time; an initial value determination unit that determines an initial value of an attenuation amount of the transmission signal based on the first output level and the second output level; and a function control unit that activates an automatic control operation that adjusts the first attenuation amount of the first transmission signal based on the initial value, and adjusts the second attenuation amount of a second transmission signal transmitted after the first transmission signal in accordance with the output level of a third transmission signal transmitted before the second transmission signal.

[0007] The function control unit may stop the automatic control operation, the acquisition unit may acquire the first output level and the second output level while the automatic control operation is stopped, and the function control unit may start the automatic control operation based on the initial value being identified.

[0008] The automatic control operation may include controlling the amount of attenuation to be increased when the output level of the third transmission signal is greater than a specified output level.

[0009] The automatic control operation may include controlling the amount of attenuation to be reduced when the output level of the third transmission signal is lower than a specified output level.

[0010] The initial value specifying section may calculate a difference by subtracting the second output level from the first output level, and specify an attenuation amount corresponding to the difference as the initial value.

[0011] The greater the difference, the greater the amount of attenuation corresponding to the difference.

[0012] According to one aspect of the present invention, there is provided an information processing method comprising: acquiring a first output level of a transmission signal at a first time and a second output level of the transmission signal at a second time after the first time; determining an initial value of an attenuation amount of the transmission signal based on the first output level and the second output level; and activating an automatic control operation to adjust the first attenuation amount of the first transmission signal based on the initial value, and to adjust the second attenuation amount of a second transmission signal transmitted after the first transmission signal in accordance with the output level of a third transmission signal transmitted before the second transmission signal.

[0013] According to one aspect of the present invention, there is provided a program that causes a computer to function as an information processing device, comprising: an acquisition unit that acquires a first output level of a transmission signal at a first time and a second output level of the transmission signal at a second time after the first time; an initial value determination unit that determines an initial value of an attenuation amount of the transmission signal based on the first output level and the second output level; and a function control unit that activates an automatic control operation that adjusts the first attenuation amount of the first transmission signal based on the initial value, and adjusts the second attenuation amount of a second transmission signal transmitted after the first transmission signal in accordance with the output level of a third transmission signal transmitted before the second transmission signal. [Effects of the Invention]

[0014] As described above, according to the present invention, it is possible to reduce the cost required to control the output level. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a block diagram illustrating an example of a functional configuration of a communication device relating to a general output control method. [Figure 2] 10 is a graph showing temperature characteristics of an output level. [Figure 3] 1 is a block diagram illustrating an example of a functional configuration of a communication device according to an embodiment of the present invention. [Figure 4]FIG. 2 is a block diagram illustrating an example of a detailed configuration of a monitoring unit. [Figure 5] 10A and 10B are diagrams illustrating an example of the output level of a burst transmission signal under output control according to a comparative example. [Figure 6] FIG. 10 is a diagram showing temporal changes in the output level of a test radio wave according to an embodiment of the present invention. [Figure 7] 10 is a graph showing temporal changes in the output level of a typical DSRC radio device when ALC control operation by DVATT is stopped. [Figure 8] 4 is a flowchart illustrating an operation of an output control method by a communication device according to an embodiment of the present invention. [Figure 9] 10A and 10B are diagrams illustrating an example of an output level of an operational radio wave by output control according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In this specification and drawings, components having substantially the same functional configurations are designated by the same reference numerals, and redundant explanations will be omitted.

[0017] In this specification and drawings, multiple components having substantially the same functional configuration are distinguished by adding different numbers after the same reference numeral. Similar components in different embodiments are distinguished by adding different letters after the same reference numeral. However, when there is no particular need to distinguish between multiple components having substantially the same functional configuration, only the same reference numeral is used.

[0018] [Summary] Next, an outline of an embodiment of the present invention will be described.

[0019] In recent years, a method for controlling the output level of a signal transmitted by a wireless communication device so as to maintain the output level at a constant level (hereinafter also referred to as an "output level control method") has become known. First, a general output control method will be briefly described with reference to Figs. 1 and 2.

[0020] Fig. 1 is a block diagram showing an example of the functional configuration of a communication device according to a general output control method. As shown in Fig. 1, a communication device 80 according to the general output control method includes an RF (Radio Frequency) transmission circuit 810, a DVATT (Dynamic Variable Attenuator) 820, an amplifier 830, a detection circuit 840, an output unit 860, an AD (Analog-Digital) converter 870, and a control unit 880.

[0021] The RF transmission circuit 810 generates an RF signal and outputs the generated RF signal to the DVATT 820 as a transmission signal. The DVATT 820 attenuates the transmission signal input from the RF transmission circuit 810 under control of the monitoring unit 881. The amplifier 830 amplifies the transmission signal after attenuation by the DVATT 820. The detection circuit 840 measures the output level of the transmission signal by detection. The output unit 860 outputs the transmission signal whose output level has been measured.

[0022] The AD converter 870 converts the analog output level into a digital output level, and outputs the digital output level to the control unit 880 .

[0023] The control unit 880 includes a monitoring unit 881 and a storage unit 882. The storage unit 882 stores data necessary for calculations by the monitoring unit 881. The monitoring unit 881 performs ALC (Automatic Level Control) control (automatic control) so that the output level is kept constant. Here, the ALC control can mean comparing the output level input from the AD converter 870 with a specified output level stored in the storage unit 882 and controlling the DVATT 820 according to the comparison result.

[0024] For example, when the output level input from the AD converter 870 is greater than a specified output level, the monitoring unit 881 controls the DVATT 820 to increase the amount of attenuation of the transmission signal by the DVATT 820. On the other hand, when the output level input from the AD converter 870 is less than the specified output level, the monitoring unit 881 controls the DVATT 820 to decrease the amount of attenuation of the transmission signal by the DVATT 820. In this way, ALC control can be achieved.

[0025] FIG. 2 is a graph showing the temperature characteristics of the output level. As shown in FIG. 2, the lower the ambient temperature, the higher the output level. As an example, if the communication device 80 starts transmitting immediately after the communication device 80 is turned on, the output level is likely to be high because the substrate temperature is low. On the other hand, as the ambient temperature increases, the output level decreases. Therefore, in actual operation, it is desirable to control the output level of the transmission signal output from the wireless device 80 to be constant.

[0026] Therefore, a technique for controlling the output level based on the temperature detected by a temperature sensor has been disclosed (see, for example, Patent Document 1).

[0027] More specifically, this technology detects the temperature when the amplifier starts up, and if a control value corresponding to the detected temperature and transmission frequency is stored in memory, the attenuation amount of the transmission signal by the variable attenuator is set based on that control value. On the other hand, if a control value corresponding to the detected temperature and transmission frequency is not stored in memory, a predetermined control value is output to the variable attenuator as an initial value, and the control value when the output level has stabilized at the predetermined output level is written to memory in association with the transmission frequency and temperature.

[0028] However, this technology requires a temperature sensor to detect the temperature when the amplifier device is turned on. Therefore, the cost of providing the temperature sensor is high. Therefore, in the embodiments of the present invention, a technology that can reduce the cost required to control the output level will be mainly described.

[0029] The outline of the embodiment of the present invention has been described above.

[0030] [Details of the embodiment] Next, details of an embodiment of the present invention will be described. As an example, a communication device according to an embodiment of the present invention can be applied to a DSRC (Dedicated Short-Range Communications) wireless communication device.

[0031] Examples of DSRC wireless communication devices include ETC (electronic toll collection system), VICS (registered trademark) (vehicle information and communication system), RSU (road side unit), etc. However, the type of device to which the communication device according to the embodiment of the present invention is applied is not limited.

[0032] (Configuration explanation) 3 is a block diagram showing an example of a functional configuration of a communication device according to an embodiment of the present invention. As shown in FIG. 3, the communication device 10 according to the embodiment of the present invention includes an RF transmission circuit 110, a DVATT 120, an amplifier 130, a detection circuit 140, an output unit 160, an AD converter 170, and a control unit 180.

[0033] The RF transmission circuit 110 generates an RF signal and outputs the generated RF signal to the DVATT 120 as a transmission signal. The DVATT 120 attenuates the transmission signal input from the RF transmission circuit 110 under control of the monitoring unit 181. The amplifier 130 amplifies the transmission signal after attenuation by the DVATT 120. The detection circuit 140 measures the output level of the transmission signal by detection. The output unit 160 outputs the transmission signal whose output level has been measured.

[0034] The AD converter 170 converts the analog output level into a digital output level, and outputs the digital output level to the control unit 180 .

[0035] The control unit 180 includes a monitoring unit 181 , a storage unit 182 , an acquisition unit 183 , an initial value specification unit 184 , and a function control unit 185 .

[0036] The control unit 180 includes a processor, and its functions can be realized by the processor executing a program stored in memory. In this case, a computer-readable recording medium on which the program is recorded can also be provided.

[0037] For example, the control unit 180 may be configured with an FPGA (Field-Programmable Gate Array), and its functions may be realized by circuit configuration data stored in memory being executed by an LSI (Large Scale Integrated Circuit). Alternatively, the control unit 180 may be configured with dedicated hardware, or may be configured with a combination of multiple pieces of hardware.

[0038] The storage unit 182 stores data necessary for calculations by the monitoring unit 181, the acquiring unit 183, the initial value specifying unit 184, and the function control unit 185.

[0039] The monitoring unit 181 performs ALC control so that the output level is kept constant. More specifically, the monitoring unit 181 compares the output level input from the AD converter 170 with a specified output level stored in the storage unit 182. The monitoring unit 181 controls the DVATT 120 according to the comparison result.

[0040] For example, when the output level input from AD converter 170 is greater than a specified output level, monitoring unit 181 increases the amount of attenuation of the transmission signal by DVATT 120. On the other hand, when the output level input from AD converter 170 is less than the specified output level, monitoring unit 181 decreases the amount of attenuation of the transmission signal by DVATT 120.

[0041] The control unit 180 is configured to be able to control the transmission time of a test RF signal (hereinafter also referred to as a "test radio wave") by the RF transmission circuit 110. Specifically, in the embodiment of the present invention, the RF transmission circuit 110 and the control unit 180 are connected, so that the control unit 180 is configured to be able to control the transmission time of the test radio wave by the RF transmission circuit 110.

[0042] In the embodiment of the present invention, the test radio wave and the RF signal during operation (hereinafter also referred to as "operation radio wave") are distinguished in terms of wording. However, the test radio wave and the operation radio wave do not need to have different characteristics, and may be radio waves with similar characteristics.

[0043] 4 is a block diagram showing a detailed configuration example of the monitoring unit 181. As shown in FIG.

[0044] The acquiring unit 183 acquires from the AD converter 170 the output level (first output level) (hereinafter also referred to as "AD value 0") at the first transmission wave slot (first time) among the transmission wave slots within the transmission time of the test radio wave. The acquiring unit 183 also acquires from the AD converter 170 the output level (second output level) (hereinafter also referred to as "AD value t") at the transmission wave slot (second time) after the transmission time of the test radio wave has elapsed since the first transmission wave slot. The acquiring unit 183 stores the acquired AD value 0 and AD value t in the storage unit 182.

[0045] The initial value determination unit 184 determines the initial value of the attenuation of the transmission signal by DVATT120 (hereinafter also referred to as "ATT value c") based on the output level (AD value 0) in the first transmission wave slot and the output level (AD value t) in the transmission wave slot after the transmission time of the test radio wave has elapsed from the first transmission wave slot.

[0046] The function control unit 185 sets a transmission time for the test radio wave and stops the ALC control operation by the monitoring unit 181. With the ALC control operation stopped, the function control unit 185 starts output of the test radio wave by the RF transmission circuit 110. After the set transmission time has elapsed, the function control unit 185 activates the ALC control operation by the monitoring unit 181. With the ALC control operation activated, the function control unit 185 starts output of an RF signal for operation (hereinafter also referred to as "operation radio wave") by the RF transmission circuit 110.

[0047] An example of the functional configuration of the communication device 10 according to the embodiment of the present invention has been described above.

[0048] (Output control according to a comparative example) Next, the output level under the output control according to the comparative example will be described.

[0049] 5 is a diagram showing an example of the output level of a burst transmission signal by output control according to a comparative example. Referring to FIG. 5, in the comparative example, the output level corresponding to the first transmission wave slot is large. Due to the ALC control operation, the output level (for example, the output level corresponding to the third transmission wave slot) is stable after a certain time has passed since the first transmission wave slot.

[0050] (Output control according to an embodiment of the present invention) 6 is a diagram showing temporal changes in the output level of a test radio wave according to an embodiment of the present invention. Referring to FIG. 6, the output level corresponding to the first transmission wave slot is at the maximum value. The acquisition unit 183 acquires from the AD converter 170 the output level (AD value 0) of the first transmission wave slot among the transmission wave slots within the transmission time of the test radio wave. The acquisition unit 183 also acquires from the AD converter 170 the output level (AD value t) of the transmission wave slot after the transmission time of the test radio wave has elapsed since the first transmission wave slot.

[0051] The transmission time of the test radio wave may be any time during which the output level of the transmission signal is stable, and may be, for example, 30 seconds. An example of the transmission time of the test radio wave will be described with reference to FIG.

[0052] The acquisition unit 183 stores the acquired AD value 0 and AD value t in the storage unit 182.

[0053] 7 is a graph showing temporal changes in the output level of a typical DSRC radio device when the ALC control operation by the monitoring unit 181 is stopped. Referring to FIG. 7, when the ALC control operation is stopped, the output level of the transmission signal immediately after the start of transmission (0 s) is at its maximum. It can also be seen that even when the ALC control operation is stopped, the output level of the transmission signal is stable 30 s after the start of transmission. That is, the function control unit 185 may set the transmission time of the test radio wave to 30 s.

[0054] 8 is a flowchart showing the operation of the output control method by the communication device 10 according to the embodiment of the present invention. As shown in FIG. 8, the function control unit 185 sets the transmission time of the test radio wave (e.g., 30 seconds) (S11). Furthermore, the function control unit 185 sets the attenuation amount of the transmission signal by the DVATT 120 to the initial value of the attenuation amount during the test (hereinafter also referred to as "ATT value 0") (S12). The function control unit 185 stops the ALC control operation by the monitoring unit 181 (S13).

[0055] The function control unit 185 controls the RF transmission circuit 110 to output the test radio wave for the set transmission time (S14). The acquisition unit 183 acquires the output level (AD value 0) corresponding to the first transmission wave slot of the test radio wave from the AD converter 170. The acquisition unit 183 also acquires the output level (AD value t) after the set transmission time of the test radio wave has elapsed from the first transmission wave slot from the AD converter 170 (S15).

[0056] The initial value specifying unit 184 calculates the amount of attenuation of the transmission signal by the DVATT 120 (ATT value 0t) based on the output level (AD value 0) corresponding to the first transmission wave slot and the output level (AD value t) after the set transmission time of the test radio wave has elapsed. More specifically, the initial value specifying unit 184 calculates the difference (AD value 0t) by subtracting the output level (AD value t) after the set transmission time of the test radio wave has elapsed from the output level (AD value 0) corresponding to the first transmission wave slot. Then, the initial value specifying unit 184 calculates the amount of attenuation of the transmission signal by the DVATT 120 (ATT value 0t) corresponding to the difference (AD value 0t) (S16).

[0057] The correspondence relationship between the difference (AD value 0t) and the attenuation amount (ATT value 0t) may be stored in advance in the storage unit 182. For example, the correspondence relationship between the difference (AD value 0t) and the attenuation amount (ATT value 0t) may be such that the greater the difference (AD value 0t), the greater the attenuation amount (ATT value 0t).

[0058] The initial value specifying unit 184 calculates the attenuation (ATT value c) of the transmission signal by the DVATT 120 by adding the initial value of the attenuation during the test (ATT value 0) and the calculated attenuation (ATT value 0t) (S17). The initial value specifying unit 184 sets the calculated attenuation (ATT value c) as the initial value of the attenuation during operation (S18). The function control unit 185 starts the ALC control operation by the monitoring unit 181 based on the setting of the initial value of the attenuation during operation (S19). The function control unit 185 controls the RF transmission circuit 110 to start outputting the operation radio wave (S20).

[0059] Here, ALC control can mean comparing the output level input from AD converter 170 with a specified output level stored in storage unit 182, and controlling DVATT 120 according to the comparison result.

[0060] For example, the ALC control may include controlling the DVATT 120 to adjust the attenuation (first attenuation) of a transmission signal (first transmission signal) corresponding to a first transmission wave slot based on an initial value of the attenuation during operation. More specifically, the ALC control may include outputting the initial value of the attenuation during operation to the DVATT 120 as the attenuation of the transmission signal corresponding to the first transmission wave slot.

[0061] Furthermore, the ALC control may include adjusting the attenuation amount (second attenuation amount) of a transmission signal (second transmission signal) corresponding to the second or subsequent transmission wave slot (hereinafter also referred to as an "adjustment slot") in accordance with the output level input from the AD converter 170. Here, the output level input from the AD converter 170 corresponds to the output level of a transmission signal (third transmission signal) corresponding to a transmission wave slot (hereinafter also referred to as a "reference slot") preceding the adjustment slot.

[0062] The correspondence between the adjustment slot and the reference slot is not limited. For example, the reference slot may be the transmission wave slot immediately before the adjustment slot, or may be the transmission wave slot two or more times before the adjustment slot. Alternatively, the reference slot may include multiple transmission wave slots. For example, the attenuation amount of the transmission signal corresponding to the adjustment slot may be adjusted based on an average value (e.g., a moving average) of the output levels of the transmission signals corresponding to the multiple transmission wave slots included in the reference slot.

[0063] Furthermore, the frequency at which the attenuation amount of the transmission signal corresponding to the adjustment slot is adjusted is not limited. For example, the attenuation amount of the transmission signal corresponding to the adjustment slot may be adjusted at a predetermined cycle. Alternatively, the attenuation amount of the transmission signal corresponding to the adjustment slot may be adjusted when the output level of the transmission signal corresponding to the reference slot or the average value of the output levels of the transmission signals corresponding to the multiple transmission wave slots included in the reference slot becomes greater than a threshold.

[0064] When the output level input from AD converter 170 is greater than the specified output level, monitoring unit 181 controls DVATT 120 to increase the amount of attenuation of the transmission signal by DVATT 120. On the other hand, when the output level input from AD converter 170 is less than the specified output level, monitoring unit 181 controls DVATT 120 to decrease the amount of attenuation of the transmission signal by DVATT 120. In this way, ALC control can be achieved.

[0065] An example of the operation of the output control method by the communication device 10 according to the embodiment of the present invention has been described above.

[0066] [Effect description] As described above, according to the embodiment of the present invention, a temperature sensor is not required, and therefore the cost required for providing a temperature sensor can be reduced.

[0067] 9 is a diagram showing an example of the output level of an operational radio wave under output control according to an embodiment of the present invention. According to the embodiment of the present invention, an initial value of the attenuation during operation is set based on the change in the AD value when the ALC control operation is stopped during output of a test radio wave. Since the output level immediately after the start of transmission of the operational radio wave is controlled based on the initial value of the attenuation during operation set in this manner, as shown in FIG. 9, the possibility that the output level immediately after the start of transmission of the operational radio wave will significantly exceed the specified output level can be reduced.

[0068] Furthermore, as described above, in the technology described in Patent Document 1, the control value when the output level stabilizes at a predetermined output level is written to memory in association with the transmission frequency and temperature. That is, in the technology described in Patent Document 1, ALC control operation is performed to stabilize the output level, so it takes a considerable amount of time until the output level stabilizes. On the other hand, according to the embodiment of the present invention, ALC control operation is not required until the output level of the test radio wave stabilizes, so the time required for the output level of the test radio wave to stabilize can be shortened.

[0069] [Description of Modifications] Although the preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, the present invention is not limited to these examples. It is clear that a person skilled in the art to which the present invention pertains can conceive of various modifications and alterations within the scope of the technical ideas set forth in the claims, and it is understood that these also naturally fall within the technical scope of the present invention.

[0070] In the above description, the function control unit 185 sets the test radio wave transmission time to the time (30 seconds) after the output level of the transmission signal has stabilized. However, the function control unit 185 may also set the test radio wave transmission time to the time before the output level has stabilized (for example, 15 seconds). In this case, the initial value determination unit 184 may estimate the initial value of the attenuation amount (ATT value c) during operation of the transmission signal by the DVATT 120 based on the output level (AD value 0) in the first transmission wave slot and the output level (AD value T) from the first transmission wave slot until the output level has stabilized. This allows for further time reduction.

[0071] More specifically, the initial value specifying unit 184 may calculate a difference (AD value 0T) by subtracting the output level (AD value T) from the output level (AD value 0) corresponding to the first transmission wave slot before the output level stabilizes after the first transmission wave slot.The initial value specifying unit 184 may then estimate the amount of attenuation (ATT value 0t) of the transmission signal by the DVATT 120 corresponding to the difference (AD value 0T).

[0072] The correspondence relationship between the difference (AD value 0T) and the attenuation amount (ATT value 0t) may be stored in advance in the storage unit 182. For example, the correspondence relationship between the difference (AD value 0T) and the attenuation amount (ATT value 0t) may be such that the greater the difference (AD value 0T), the greater the attenuation amount (ATT value 0t). [Explanation of symbols]

[0073] 10. Communications equipment 110 RF Transmitting Circuit 120 DVATT 130 Amplifier 140 Detector circuit 160 Output section 170 AD converter 180 Control Unit 181 Monitoring Department 182 Storage section 183 Acquisition Department 184 Initial Value Specification Section 185 Function control section

Claims

1. an acquisition unit that acquires a first output level of a transmission signal at a first time and a second output level of the transmission signal at a second time that is later than the first time; an initial value specifying unit that specifies an initial value of an attenuation amount of a transmission signal based on the first output level and the second output level; a function control unit that activates an automatic control operation to adjust a first attenuation amount of a first transmission signal based on the initial value, and to adjust a second attenuation amount of a second transmission signal that is transmitted after the first transmission signal in accordance with an output level of a third transmission signal that is transmitted before the second transmission signal; An information processing device comprising:

2. The function control unit stops the automatic control operation, the acquisition unit acquires the first output level and the second output level in a state in which the automatic control operation is stopped, the function control unit activates the automatic control operation based on the identification of the initial value. The information processing device according to claim 1 .

3. the automatic control operation includes controlling the attenuation amount to be increased when the output level of the third transmission signal is higher than a specified output level.

3. The information processing device according to claim 1.

4. the automatic control operation includes controlling the attenuation amount to be reduced when the output level of the third transmission signal is lower than a specified output level.

3. The information processing device according to claim 1.

5. the initial value specifying unit calculates a difference by subtracting the second output level from the first output level, and specifies an attenuation amount corresponding to the difference as the initial value. The information processing device according to any one of claims 1 to 4.

6. The larger the difference, the larger the attenuation amount corresponding to the difference. The information processing device according to claim 5 .

7. obtaining a first output level of a transmission signal at a first time and a second output level of the transmission signal at a second time after the first time; determining an initial value of an amount of attenuation of a transmission signal based on the first output level and the second output level; starting an automatic control operation to adjust a first attenuation amount of a first transmission signal based on the initial value, and to adjust a second attenuation amount of a second transmission signal transmitted after the first transmission signal in accordance with an output level of a third transmission signal transmitted before the second transmission signal; An information processing method comprising:

8. Computer, an acquisition unit that acquires a first output level of a transmission signal at a first time and a second output level of the transmission signal at a second time that is later than the first time; an initial value specifying unit that specifies an initial value of an attenuation amount of a transmission signal based on the first output level and the second output level; a function control unit that activates an automatic control operation to adjust a first attenuation amount of a first transmission signal based on the initial value, and to adjust a second attenuation amount of a second transmission signal that is transmitted after the first transmission signal in accordance with an output level of a third transmission signal that is transmitted before the second transmission signal; A program that causes the information processing device to function as an information processing device having the above.

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