JP5154966B2 - Method, program, and apparatus for controlling receiver sensitivity of receiver - Google Patents

Description

  The present invention relates to a method, a program, and an apparatus for automatically adjusting reception sensitivity according to a noise level.

  At sites such as warehouses where goods are transported by forklifts, personal injury may occur during operation of forklifts without being aware of workers behind the goods being transported by forklifts or workers behind forklifts. There is.

  In order to avoid such an accident, it is necessary that the driver of the forklift and the worker working around the forklift always perform the operation and work while paying attention to each other. However, there are cases where attention is not paid to the attention because the driver and the operator of the forklift concentrate on the operation and work. Even if an operator around the forklift comes close to the forklift and feels dangerous, he / she may speak to the driver, and the voice may not be heard due to engine noise or the like, resulting in an accident.

  In addition, various radio noise is generated in factories and the like, and the reception sensitivity of an RFID (Radio Frequency IDentification) tag is adjusted in accordance with the level of radio noise, so that the system operates stably.

  For example, Patent Document 1 discloses a system in which a passive IC tag affixed to a packing material for luggage communicates with a reader / writer device. In this system, a load that the forklift is to carry is regarded as one of the causes of radio noise, and the presence / absence of the load on the forklift is detected by a weight sensor to control the radio wave output of the reader / writer device.

However, radio noise may occur due to causes other than those described in Patent Document 1. For example, if the forklift moves, the receiver mounted on the forklift also moves, so the radio noise will fluctuate in time / location, but it is possible to cope with such temporal / location variations in radio noise. Such a system is not disclosed in Patent Document 1, for example.
JP 2006-347713 A "Communication device and transport device"

  The present invention automatically adjusts the reception sensitivity of a tag in accordance with the ambient noise in an environment where the noise varies, and avoids unnecessary sensitivity adjustment when the ambient noise varies within the fluctuation range. An object of the present invention is to provide a method and apparatus for automatically adjusting reception sensitivity.

The proposed first reception sensitivity automatic adjustment method is a method of measuring ambient noise and adjusting the sensitivity from the measurement result.
This method reads the predetermined number of noise data from the first storage unit of the computer that stores the noise data obtained by measurement as a history for a predetermined number, and is the maximum value of the read noise data. A step of calculating a maximum noise value and a minimum noise value which is a minimum value, and reading out a first noise threshold set from the second storage unit of the computer, and the read first noise threshold set indicates A step of calculating a first sensitivity corresponding to the minimum noise value based on a stepwise relationship between noise and sensitivity, and corresponding to each threshold value of the first noise threshold set from the third storage unit of the computer. A set of noise thresholds having thresholds, each of which reads a second set of noise thresholds set to be smaller than a corresponding threshold of the first set of noise thresholds, A step of calculating the second sensitivity corresponding to the maximum noise value based on the step-like relationship between the noise and sensitivity indicated by the set of noise thresholds, and the larger one of the calculated first sensitivity and second sensitivity is set. A sensitivity candidate calculation step for calculating a sensitivity candidate to be calculated, and a sensitivity setting step for setting the calculated sensitivity candidate to a set sensitivity when the calculated sensitivity candidate is different from the set sensitivity, Is provided.

  Here, the first sensitivity corresponding to the minimum noise value is calculated based on the stepwise relationship between the noise and the sensitivity indicated by the first set of noise threshold values stored in the second storage unit of the computer, and the computer Stored in the third storage unit, a set of noise thresholds having thresholds corresponding to the respective thresholds of the first set of noise thresholds, each threshold being greater than the corresponding threshold of the first set of noise thresholds The second sensitivity corresponding to the maximum noise value is calculated on the basis of the step-like relationship between the noise and the sensitivity indicated by the second noise threshold set that is set to be too small.

  Therefore, there is no need for the measured noise fluctuation within the range of “fluctuation” indicated by the difference between a certain threshold of the first noise threshold set and the corresponding threshold of the second noise threshold set. Sensitivity adjustment can be avoided.

  The proposed second reception sensitivity automatic adjustment method is the same as the first reception sensitivity automatic adjustment method, wherein noise data storage units are provided for the number of channels, and a predetermined number of noises acquired from the noise data storage unit of each channel. When each of the above steps is performed on the data and a sensitivity candidate calculated for each channel is larger than the set sensitivity, the set sensitivity is set as the sensitivity candidate. And when all the sensitivity candidates calculated for each channel are smaller than the set sensitivity, the set sensitivity is changed to the maximum of the sensitivity candidates. Steps.

  According to the present invention, the reception sensitivity of the tag is automatically adjusted according to the ambient noise in an environment where the noise varies, and unnecessary sensitivity adjustment is avoided when the ambient noise varies within the fluctuation range. be able to. Therefore, the load on the apparatus for adjusting the reception sensitivity can be reduced. For example, when the present system is mounted on a forklift, it is possible to reduce the risk of the above-mentioned personal injury.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
An automatic reception sensitivity adjustment system according to an embodiment of the present invention is mounted on a forklift that transports luggage at a site such as a warehouse. There are workers who work around the forklift at the site. An active RFID tag is affixed to the worker's helmet, and an active RFID reader on the forklift receives radio waves including ID information transmitted intermittently by the active RFID tag.

FIG. 1 is a diagram showing a configuration of a reception sensitivity automatic adjustment system mounted on a forklift according to an embodiment of the present invention.
As shown in FIG. 1, this system includes ambient antennas 1 and 2, an active RFID reader (hereinafter referred to as “dedicated reader”) 3, a relay 4, a battery 5, an ambient signal lamp 6, a noise warning signal lamp 7, and audio. It is comprised by the alarm device 8. Each component is installed on a forklift.

The surrounding antennas 1 and 2 are antennas that receive surrounding noise installed at different positions of the forklift.
The dedicated reader 3 quantifies (numerizes) the noise received by the surrounding antennas 1 and 2 and overwrites the channel ch1 buffer 11 and the channel ch2 buffer 12 as shown in FIG. . That is, the dedicated reader 3 holds the next writing position for the buffers 11 and 12, and writes the digitized noise data at the writing position.

  The channel ch1 buffer 11 holds data for noise received by one of the surrounding antennas 1 and 2, and the channel ch2 buffer 12 holds the other of the surrounding antennas 1 and 2. The data for the noise received by the antennas is held.

  Further, in the present embodiment, noise data is written into each buffer shown in FIG. 2 every second, and the noise data is held as a history of 10 pieces including the current time. Of the stored history, the latest three noise data including the current time are used for the sensitivity adjustment processing of FIG. 6 described later (this processing is also performed by the dedicated reader 3).

  The result of the sensitivity adjustment processing is notified from the dedicated reader 3 via the relay 4 to the ambient signal lamp 6, the noise warning signal lamp 7, and the sound alarm 8, and is turned on or set according to the set sensitivity. Audio output according to the sensitivity.

The battery 5 supplies power to the dedicated reader 3.
FIG. 3 is a block diagram showing a configuration of a sensitivity adjustment processing unit provided in the dedicated reader 3 of FIG.

  As shown in FIG. 3, the sensitivity adjustment processing unit 20 includes a control unit 21, a ch1 noise reception buffer 23, a ch2 noise reception buffer 24, a minimum noise value calculation unit 25, a maximum noise value calculation unit 26, and a first sensitivity level. The setting unit 27, the second sensitivity level setting unit 28, the system setting value table 29, the sensitivity level determination unit 31, the instruction unit 32, and the setting sensitivity level storage unit 33 are configured.

The control unit 21 is an execution base that performs overall control, and performs the following two processes.
That is, the sensitivity level obtained from the ch1 noise data is determined using the latest three of the ten history data including the latest history held in the ch1 noise reception buffer 23.

  Also, the sensitivity level obtained from the ch2 noise data is determined using the latest three of the ten history data including the latest history held in the ch2 noise reception buffer 24.

Then, the control unit 21 notifies the sensitivity level determination unit 31 of the determined sensitivity level of ch1 and the sensitivity level of ch2.
Upon receiving the notification from the control unit 21, the sensitivity level determination unit 31 detects the sensitivity level of ch 1, the sensitivity level of ch 2, and the currently set sensitivity level (“set sensitivity level” stored in the set sensitivity level storage unit 33. To determine the final sensitivity level.

  The processing result (final sensitivity level) by the sensitivity level determination unit 31 is notified to the instruction unit 32. The instruction unit 32 instructs the relay based on the content notified from the sensitivity level determination unit 31.

Next, the control performed by the control unit 21 will be described more specifically.
The control unit 21 executes a predetermined process for all noise reception buffers. Therefore, the control unit 21 acquires a buffer to be processed (for example, the noise reception buffer for ch1 23) from the noise reception buffer list (not shown), and a predetermined number (in this case) from the latest history from the buffer to be processed. The minimum noise value calculation unit 25 and the maximum noise value calculation unit 26 are instructed to acquire and process the noise data (3 pieces including the latest history).

  Upon receiving an instruction from the control unit 21, the minimum noise value calculation unit 25 acquires the latest three of the 10 histories of noise data including the latest history held in the buffer to be processed, and the 3 The minimum value (also referred to as “minimum noise value”) of the noise data is calculated and notified to the first sensitivity level setting unit 27.

  Upon receiving the notification from the minimum noise value calculation unit 25, the first sensitivity level setting unit 27 shows a stepwise relationship between the noise and sensitivity indicated by the combination of the noise threshold and the sensitivity level held in the system setting value table 29. The sensitivity level corresponding to the notified minimum noise value (referred to as “first sensitivity level”) is calculated.

  On the other hand, the maximum noise value calculation unit 26 that has received an instruction from the control unit 21 acquires the latest three of the ten history data of noise data including the latest history held in the buffer to be processed, The maximum value (also referred to as “maximum noise value”) of the three noise data is calculated and notified to the second sensitivity level setting unit 28.

  The second sensitivity level setting unit 28 that receives the notification from the maximum noise value calculating unit 26 subtracts the noise threshold value of each set of noise threshold values held in the system setting value table 29 by the noise threshold value difference. A sensitivity level (referred to as “second sensitivity level”) corresponding to the notified maximum noise value is calculated using a stepwise relationship between noise and sensitivity indicated by the set and sensitivity level set.

  The control unit 21 determines the larger of the “first sensitivity level” and the “second sensitivity level” as the sensitivity level (sensitivity level of the channel) obtained from the noise data of the buffer to be processed.

FIG. 4 is a diagram showing two broken lines used when obtaining the noise reception sensitivity from the measured noise.
In the present embodiment, in order to avoid frequent changes in noise reception sensitivity due to frequent changes in the vicinity of the noise threshold in the vicinity of the noise, the sensitivity is reduced with respect to noise fluctuations within the range of “fluctuation”. Control that does not change is performed.

  As shown in FIG. 4, the stepped broken line 41 has three noise threshold values A, B, and C (A <B <C) in order from the smallest, and the sensitivity value is a step value in each noise threshold value. It changes in shape.

  Further, the stepped polygonal line 42 has three noise thresholds of A-α, B-α, and C-α (A-α <B-α <C-α) in order from the smallest, and each noise The sensitivity value changes stepwise at the threshold.

As described above, in the present embodiment, sensitivity adjustment processing is performed for each channel by using three noise data histories including the latest history. That is, for the minimum noise data (hereinafter referred to as “minimum noise value”) of the three histories, the noise threshold is increased (A> A−α, B> B−α, C> C−α). ) To calculate the sensitivity using the polygonal line 41 set to 3)
For the maximum noise data (hereinafter referred to as “maximum noise value”) of the individual histories, the noise threshold is set to be smaller (A−α <A, B−α <B, C−α <C). Sensitivity is calculated using the broken line 42. In this way, the interval between the measured noise data and the noise threshold value used when determining the sensitivity can be increased, and the sensitivity can be prevented from easily changing with respect to the noise change.

FIG. 5 is a state transition diagram of sensitivity setting.
5, the upper side shows the state transition of the sensitivity level determination process corresponding to the minimum noise value using the broken line 41 in FIG. 4, and the lower side shows the sensitivity level corresponding to the maximum noise value using the broken line 42 in FIG. Indicates the state transition of the decision process.

FIG. 6 is a diagram illustrating a data structure of a system setting value table used for sensitivity adjustment processing and the like.
In the table of FIG. 6, “warning holding time” indicates the holding time of the lighting state when the noise warning signal lamp 7 of FIG. 1 is turned on.

  “Reception sensitivity level / low”, “reception sensitivity level / medium”, and “reception sensitivity level / high” include values indicating the reception sensitivity level, for example, “low sensitivity” and “high sensitivity” on the vertical axis in FIG. , “High sensitivity” is set.

  “Sensitivity Adjustment Noise Threshold / Low”, “Sensitivity Adjustment Noise Threshold / Medium”, and “Sensitivity Adjustment Noise Threshold / High” include noise thresholds used for sensitivity adjustment, for example, “A” and “B” on the horizontal axis of FIG. ”And“ C ”are set.

“Noise threshold difference” indicates a difference between corresponding noise threshold values of the two broken lines 41 and 42 in FIG. 4. In FIG. 6, “5” is set as the value of “α” in FIG. 4 in this item.
“Number of data used for noise determination” indicates how many pieces of noise data in the noise reception buffer are used to execute the sensitivity adjustment processing.

FIG. 7 is a flowchart of sensitivity adjustment processing. This flowchart is executed by the sensitivity adjustment processing unit 20 of FIG.
In step S101 of FIG. 7, it is determined whether a predetermined time has elapsed. The “predetermined time” is, for example, a time shorter than the interval at which noise data is written in the reception buffer.

As long as the predetermined time has not elapsed (the determination result in S101 is No), the determination in step S101 is repeated.
If it is determined in step S101 that the predetermined time has elapsed (if the determination result in S101 is Yes), in step S102, three pieces of noise data including the latest history are stored for each channel (ch1, ch2). The maximum noise value and the minimum noise value are obtained.

  In step S103 following step S102, one of ch1 and ch2 (for example, ch1) is set as the current channel, and sensitivity level setting processing using the minimum noise value is executed for the current channel. The sensitivity level set in this sensitivity level setting process is referred to as a “first sensitivity level”.

  In subsequent step S104, sensitivity level setting processing using the maximum noise value is executed for the current channel. The sensitivity level set in this sensitivity level setting process is referred to as a “second sensitivity level”.

  In step S105 following step S104, the larger sensitivity level of the first sensitivity level set in step S103 and the second sensitivity level set in step S104 is determined as the sensitivity level for the current channel.

In a succeeding step S106, it is determined whether there is an unprocessed channel.
When it is determined in step S106 that there is an unprocessed channel (when the determination result in S106 is Yes), in step S107, the other of ch1 or ch2 (for example, ch2) is set as the current channel, and step S103 Returning to step S103, the sensitivity level for the other channel is determined by the processing in steps S103 to S105.

  When the processing is completed for all channels, the sensitivity level for each channel is obtained. In the processing after step S108, the sensitivity level for each channel and the currently set reception sensitivity level (hereinafter referred to as “set sensitivity level”). ) To obtain the final sensitivity level and store it in the set sensitivity level storage unit.

  That is, if it is determined in step S106 that there is no unprocessed channel (if the determination result in S106 is No), whether or not any of the sensitivity levels of ch1 and ch2 is higher than the set sensitivity level in step S108. Is determined.

  When it is determined in step S108 that one of the sensitivity levels of ch1 and ch2 is higher than the set sensitivity level (when the determination result in S108 is Yes), the sensitivity level of ch1 and ch2 is higher in step S109. Is set to the set sensitivity level, the state change flag is set to ON, and the process returns to step S101. In this case, the sensitivity level is changed to be higher than the set sensitivity level.

  When it is determined in step S108 that both the sensitivity levels of ch1 and ch2 are lower than the set sensitivity level or at least one of the sensitivity levels is the same as the set sensitivity level (when the determination result in S108 is No), in step S110 , Ch1, and ch2 are all determined to be lower than the set sensitivity level.

  If it is determined in step S110 that at least one of the sensitivity levels of ch1 and ch2 is the same as the set sensitivity level (if the determination result in S110 is No), the process immediately returns to step S101.

  On the other hand, if it is determined in step S108 that both the sensitivity levels of ch1 and ch2 are lower than the set sensitivity level (if the determination result in S110 is Yes), the higher of the sensitivity levels of ch1 and ch2 in step S111. Is set to the set sensitivity level, the state change flag is set to ON, and the process returns to step S101. In this case, the sensitivity level is changed to be lower than the set sensitivity level.

The above-described processing of steps S105 and S108 to S111 in FIG. 7 has a meaning of defeating to the safe side when it is difficult to make a clear determination.
That is, reception of the tag is affected by ambient noise and other factors, but it is easier to receive radio waves from the tag when the sensitivity is increased. In the system of this embodiment, if the radio wave of the tag cannot be received, it is impossible to warn that there is an operator. Therefore, if it is difficult to determine whether the sensitivity should be increased or decreased, the sensitivity is increased (already increased). (If it is in a state, it will not be lowered) so that the system can be operated stably (= ensured to operate safely).

FIG. 8 is a flowchart of sensitivity level setting processing using the minimum noise value in the sensitivity adjustment processing.
In step S201 of FIG. 8, the system setting value table is referred to, and the minimum noise value calculated in step S102 of FIG. 7 is a value (hereinafter referred to as “sensitivity adjustment noise threshold / large”) set in the table. , “Noise Threshold / Large”).

  When it is determined in step S201 that the minimum noise value is larger than “noise threshold / large” (when the determination result in S201 is Yes), in step S202, the measured noise has reached the warning noise level. The “noise warning” that is the sensitivity value shown is set as the first sensitivity level, and the series of processing ends.

  On the other hand, when it is determined in step S201 that the minimum noise value is equal to or less than “noise threshold / large” (when the determination result in S201 is No), the system setting value table is referred to in step S203, and FIG. It is determined whether or not the minimum noise value calculated in step S102 is larger than a value (hereinafter referred to as “noise threshold / medium”) set in the item “sensitivity adjustment noise threshold / medium” on the table.

  When it is determined in step S203 that the minimum noise value is larger than “noise threshold / medium” (when the determination result in S203 is Yes), in step S204, the “reception sensitivity level / large” on the system setting value table is set. A value set in the item (hereinafter referred to as “sensitivity level / high”) is set as the first sensitivity level, and a series of processing ends.

  On the other hand, when it is determined in step S203 that the minimum noise value is equal to or less than “noise threshold / medium” (when the determination result in S203 is No), the system setting value table is referred to in step S205, and FIG. It is determined whether or not the minimum noise value calculated in step S102 is greater than a value (hereinafter referred to as “noise threshold / small”) set in the item “sensitivity adjustment noise threshold / small” on the table.

  If it is determined in step S205 that the minimum noise value is larger than “noise threshold / small” (when the determination result in S205 is Yes), “reception sensitivity level / medium” on the system setting value table is determined in step S206. A value set in the item (hereinafter, referred to as “sensitivity level / medium”) is set as the first sensitivity level, and a series of processing ends.

  On the other hand, when it is determined in step S205 that the minimum noise value is equal to or smaller than “noise threshold / small” (when the determination result in S205 is No), in step S207, “reception sensitivity level · A value set in the item “low” (hereinafter, referred to as “sensitivity level / small”) is set as the first sensitivity level, and the series of processing ends.

FIG. 9 is a flowchart of the sensitivity level setting process using the maximum noise value in the sensitivity adjustment process.
In step S301 of FIG. 9, the system setting value table is referred to, and the maximum noise value calculated in step S102 of FIG. 7 is a value (hereinafter referred to as “sensitivity adjustment noise threshold / small”) set in the table. , “Noise threshold / small”), a value obtained by subtracting the value set in the item of “noise threshold difference” on the table (ie, “noise threshold / small” − “noise threshold difference” or less, It is determined whether this value is larger than “noise threshold / small (small)”.

In step S301, when it is determined that the maximum noise value is smaller than “noise threshold / small (small)” (when the determination result in S301 is Yes), in step S302, “reception sensitivity level · A value set in the item “low” (hereinafter, referred to as “sensitivity level / small”) is set as the second sensitivity level, and the series of processing ends.

  On the other hand, when it is determined in step S301 that the maximum noise value is greater than or equal to “noise threshold / small (small)” (when the determination result in S301 is No), the system setting value table is referred to in step S303. , The maximum noise value calculated in step S102 in FIG. 7 is determined from the value (hereinafter referred to as “noise threshold / medium”) set in the item “sensitivity adjustment noise threshold / medium” on the table. From the value obtained by subtracting the value set in the item of “noise threshold difference” (ie, “noise threshold / medium” − “noise threshold difference” or less, this value is referred to as “noise threshold / medium (smaller)”) It is determined whether it is small.

  When it is determined in step S303 that the maximum noise value is smaller than “noise threshold / medium (small)” (when the determination result in S303 is Yes), in step S304, “reception sensitivity level · A value set in the item “medium” (hereinafter, referred to as “sensitivity level / medium”) is set as the second sensitivity level, and the series of processing ends.

  On the other hand, when it is determined in step S303 that the maximum noise value is equal to or greater than “noise threshold / medium (small)” (when the determination result in S303 is No), the system setting value table is referred to in step S305. , The maximum noise value calculated in step S102 in FIG. 7 is determined from the value (hereinafter referred to as “noise threshold / large”) set in the item “sensitivity adjustment noise threshold / large” on the table. The value obtained by subtracting the value set in the item of “noise threshold difference” (that is, “noise threshold / large” − “noise threshold difference” or less, this value is called “noise threshold / large (small)”) It is determined whether it is large.

  When it is determined in step S305 that the maximum noise value is smaller than “noise threshold / large (small)” (when the determination result in S305 is Yes), in step S306, “reception sensitivity level · A value set in the item “large” (hereinafter, referred to as “sensitivity level / large”) is set as the second sensitivity level, and the series of processing ends.

  On the other hand, when it is determined in step S305 that the maximum noise value is greater than or equal to “noise threshold / large (small)” (when the determination result in S305 is No), the measured noise is warning noise in step S307. “Noise warning”, which is a sensitivity value indicating that the level has been reached, is set as the second sensitivity level, and a series of processing ends.

FIG. 10 is a diagram illustrating an example of a storage medium.
Programs and data for the processing of the present embodiment can be loaded from the storage device 51 of the computer 50 to the memory of the computer 50 and executed, or can be loaded from the portable storage medium 53 to the memory of the computer 50 and executed. It is also possible to load the program from the external storage device 54 to the memory of the computer 50 via the network 55 and execute it.

  In the above description, it is possible to omit steps S103 and S105 in FIG. 7 and set the sensitivity level calculated in step S104 as the sensitivity level of the channel.

In this case, the reception sensitivity automatic adjustment method in which the computer executes a process of measuring the ambient noise and adjusting the reception sensitivity of the tag from the measurement result includes the following steps.
That is, the predetermined number of noise data is read from the first storage unit of the computer that stores the noise data obtained by measurement as a history for a predetermined number, and the maximum value that is the maximum value of the read noise data Calculating a noise value;
Reading a stepwise relationship between noise and sensitivity indicated by a set of noise threshold and sensitivity level from the second storage unit of the computer, and calculating a sensitivity corresponding to the maximum noise value based on the relationship;
And a sensitivity setting step for setting the calculated sensitivity to the set sensitivity when the calculated sensitivity is different from the set sensitivity.

  Further, when there are a plurality of channels (antennas), each channel includes the first storage unit that stores a predetermined number of noise data as a history, and the predetermined number of channels acquired from the first storage unit of each channel. The above steps are executed on the noise data.

And, when there is a sensitivity larger than the set sensitivity among the sensitivities calculated for each channel, the step of changing the set sensitivity to the sensitivity,
If all the sensitivities calculated for each channel are smaller than the set sensitivity, the step of changing the set sensitivity to the maximum of those sensitivities is further executed.

  In such a configuration, the sensitivity corresponding to the maximum noise value is calculated based on the stepwise relationship between the noise and sensitivity indicated by the noise threshold set and sensitivity level set stored in the second storage unit of the computer. doing. Therefore, the sensitivity is calculated for the maximum value in the history of a predetermined number of noise data, and the sensitivity is calculated by the higher one in the “fluctuation” range of the predetermined number of noise data. By doing so, unnecessary sensitivity adjustment can be avoided.

It is a figure which shows the structure of the receiving sensitivity automatic adjustment system mounted in the forklift which concerns on one Embodiment of this invention. It is a figure which shows the buffer holding the noise data with respect to two antennas. It is a block diagram which shows the structure of the sensitivity adjustment process part provided in the exclusive reader of FIG. It is the figure which showed the two broken lines used when calculating | requiring reception sensitivity from the measured noise. It is a state transition diagram of a sensitivity setting. It is a figure which shows the data structure of the system setting value table used for a sensitivity adjustment process. It is a flowchart of a sensitivity adjustment process. It is a flowchart of the sensitivity level setting process using the minimum noise value in the sensitivity adjustment process. It is a flowchart of a sensitivity level setting process using the maximum noise value in the sensitivity adjustment process. It is a figure which shows the example of a storage medium.

Explanation of symbols

1, 2 Ambient antenna 3 Dedicated reader 4 Relay 5 Battery 6 Ambient signal light 7 Noise warning signal light 8 Audio alarm 11, 12 Buffer 20 Sensitivity adjustment processing unit 21 Control unit 23 ch1 reception buffer 24 ch2 reception buffer 25 Minimum Noise value calculation unit 26 Maximum noise value calculation unit 27 First sensitivity level setting unit 28 Second sensitivity level setting unit 29 System setting value table 31 Sensitivity level determination unit 32 Instruction unit 33 Setting sensitivity level storage unit 41, 42 Stair-shaped broken line 50 Computer 51 Storage Device 53 Portable Storage Medium 54 External Storage Device 55 Network

Claims (12)

In a control method in which a computer controls reception sensitivity of a receiver in accordance with noise,
A first value of measurement data stored in a storage unit of the computer and stored for a predetermined number of noises obtained by measurement and a second value larger than the first value are specified. ,
Based on the first rule for determining the sensitivity corresponding to the value of the measurement data and the first value, the first sensitivity is determined,
The second sensitivity is determined based on the second rule based on the second rule in which the sensitivity corresponding to the measured data value is greater than the first rule, and the second value. ,
The larger sensitivity of the determined first sensitivity and the second sensitivity is different from the sensitivity set as the reception sensitivity of the receiver , and the set sensitivity is reduced. Further, the control method is characterized in that the set sensitivity is changed to the larger sensitivity . The first value is a minimum value of measurement data stored for a predetermined number of noises obtained by measurement,
The second value is a maximum value of measurement data stored for a predetermined number of noises obtained by measurement,
The control method according to claim 1 . For a plurality of measurement data respectively measured by the plurality of measuring devices, the first sensitivity and the second sensitivity is determined,
Greatest sensitivity among the plurality of the first sensitivity and the second sensitivity is determined for the measurement data each, if the sensitivity is greater than that has been set, the sensitivity is set, the most Change to a higher sensitivity ,
The method of claim 1, wherein the this. Wherein all of the plurality of the first sensitivity and the second sensitivity is determined for the measurement data each of which is smaller than the sensitivity is set, the sensitivity is set, the plurality of measurement data Change to the highest sensitivity of the first sensitivity and the second sensitivity calculated respectively .
The control method according to claim 3 . In a program that causes a computer to execute control of reception sensitivity of a receiver according to noise,
A first value of measurement data stored in a storage unit of the computer and stored for a predetermined number of noises obtained by measurement and a second value larger than the first value are specified. ,
Based on the first rule for determining the sensitivity corresponding to the value of the measurement data and the first value, the first sensitivity is determined,
The second sensitivity is determined based on the second rule based on the second rule in which the sensitivity corresponding to the measured data value is greater than the first rule, and the second value. ,
When the larger sensitivity of the determined first sensitivity and the second sensitivity is different from the sensitivity set as the reception sensitivity of the receiver , and when the set sensitivity is reduced , Changing the set sensitivity to the larger sensitivity ,
A program for causing the computer to execute processing. The first value is a minimum value of measurement data stored for a predetermined number of noises obtained by measurement,
The second value is a maximum value of measurement data stored for a predetermined number of noises obtained by measurement,
6. The program according to claim 5, wherein: For a plurality of measurement data respectively measured by the plurality of measuring devices, the first sensitivity and the second sensitivity is determined,
Greatest sensitivity among the plurality of the first sensitivity and the second sensitivity is determined for the measurement data each, if the sensitivity is greater than that has been set, the sensitivity is set, the most Causing the computer to execute a process of changing to a large sensitivity ;
Claim 5 or 6, wherein the program is characterized and this. Wherein all of the plurality of the first sensitivity and the second sensitivity is determined for the measurement data each of which is smaller than the sensitivity is set, the sensitivity is set, the plurality of measurement data Causing the computer to execute a process of changing to the highest sensitivity of the first sensitivity and the second sensitivity calculated respectively .
The program according to claim 7, wherein: In the control device that controls the reception sensitivity of the receiver according to the noise,
A storage unit for storing measurement data in which a predetermined number of noises obtained by measurement are stored;
A specifying unit for specifying a first value of the measurement data stored in the storage unit and a second value larger than the first value;
A first sensitivity determining unit that determines a first sensitivity based on a first rule that determines a sensitivity corresponding to the value of the measurement data, and the first value;
A second rule that the sensitivity corresponding to said value in accordance with the value of the measurement data is determined to greater sensitivity than the first rule, and said second value, based on to determine the second sensitivity A second sensitivity determining unit;
When the larger sensitivity of the determined first sensitivity and the second sensitivity is different from the sensitivity set as the reception sensitivity of the receiver , and when the set sensitivity is reduced And a sensitivity setting unit that changes the set sensitivity to the larger sensitivity . The first value is a minimum value of measurement data stored for a predetermined number of noises obtained by measurement,
The second value is a maximum value of measurement data stored for a predetermined number of noises obtained by measurement,
The control device according to claim 9 . The first sensitivity determining section and the second sensitivity determining section, for a plurality of measurement data respectively measured by the plurality of measuring devices, the first sensitivity and the second sensitivity respectively determined,
When the highest sensitivity among the first sensitivity and the second sensitivity determined for each of the plurality of measurement data is larger than the set sensitivity, the sensitivity setting unit is set. the sensitivity is changed to the largest sensitivity,
11. The control device according to claim 9 or 10, wherein: All of the plurality of the first sensitivity and the second sensitivity is determined for the measurement data each of which is smaller than the sensitivity that is set, the sensitivity setting unit, the sensitivity is set , Change to the highest sensitivity of the first sensitivity and the second sensitivity calculated for each of the plurality of measurement data ,
The control device according to claim 11 .