KR101089186B1 - Method of Sensing an Event - Google Patents

Abstract

The present invention relates to an event occurrence detection method for detecting an event more accurately by changing a reference value according to the case of a sensor whose initial value is changed according to a mounting position or an ambient state of an electronic and electrical appliance equipped with a sensor. In the event generation detection method for detecting whether the event occurs by the sensor provided in the electronic or electronic product, the sensing value (S _n ) is received from the sensor to read the previous reference value (R _n-1 ) stored in the memory Obtaining the difference value D _n between the sensing value S _n and the previous reference value R _n-1 , reading the determination value T registered in the memory, and the difference value D _n) by comprising the step of determining whether the determined value (occurrence determine whether more than the event T), two days despite not a real event occurs and the event recognition It may be so.

Event, sensor, detection, reference value

Description

{Method of Sensing an Event}

The present invention relates to a method for detecting an event occurrence. In particular, in the case of a sensor in which a value initially sensed is changed according to a mounting position or an ambient state of an electronic appliance equipped with a sensor, the reference value is also changed accordingly to more precisely generate an event. The present invention relates to a method of detecting an event occurrence.

In general, as a method of detecting that an event has occurred in an electrical and electronic product, a sensor is mainly provided in the electrical and electronic product, and the sensor performs a sensing operation when the electrical and electronic product is driven to detect the sensor. When the value is higher or lower than the preset value, most of the methods of recognizing that an event has occurred are used.

For example, in the case of a gyro sensor used in a vehicle image black box, the gyro sensor detects sudden braking, rapid start, collision, contact, etc. of the vehicle and informs the main controller of the vehicle image black box so that the image is before and after the detected point. To save the event as an event.

In this case, in order for the vehicle video black box to actually detect the occurrence of an event and to store the image before and after the detected time point as an event file, it is possible to first determine that an event such as a sudden braking, sudden start, collision, or contact of the vehicle has occurred. The reference value (that is, the reference G value) is preset in the memory, and the gyro sensor merely detects a change in the G value caused by the movement of the vehicle, and the detected G value is compared with the reference G value preset in the memory. When the detected G value is larger than the reference G value preset in the memory, the controller notifies the main controller of the vehicle image black box, so that the main control unit of the vehicle image black box is at this time (ie, Images before and after the notification that an event has occurred are processed and stored as an event file.

Such a gyro sensor has a G value of '0' in the X axis direction (left and right direction), a G value of '1' in the Y axis direction (up and down direction), and a G value of '0' in the Z axis direction (rear direction). When the vehicle has a unique G value and the vehicle video black box equipped with the gyro sensor is mounted on the vehicle, the gyro sensor is initially detected according to the mounting position or direction, or the current state of the vehicle (that is, the road condition of the parked vehicle). Has a characteristic that the G value can vary.

In other words, when the vehicle video black box equipped with the gyro sensor is mounted on the vehicle, if the vehicle video black box is mounted so that the vehicle is parked and the parked road is exactly horizontal and vertical on a very flat place, the gyro sensor is first The detected G value can be similar to the original G value. However, depending on the user, the mounting position or direction of the vehicle video black box may be different, and the vehicle parking lot road condition may be different when the vehicle video black box is mounted, and thus, the G value detected by the gyro sensor for the first time is unique. It is inevitably different from the G value.

Nevertheless, when the reference G value is set in advance and stored in the memory, the gyro sensor has no choice but to set it based on the gyro sensor's unique G value, and the gyro sensor also compares the detected G value with the preset reference G value. If the G-sensor detected by the gyro sensor is rather high when the vehicle video black box is mounted on the vehicle, it is recognized as an event occurrence even though the event is not generated even with a slight impact. There was a problem that could be.

And even when the vehicle is driving, the G value detected by the gyro sensor on the average may vary significantly from the inherent G value depending on the road condition (eg, inclined road, uphill road, downhill road, etc.). In this case, if the G value sensed by the gyro sensor is measured to be somewhat high, there is a problem that the event may be recognized as an event occurrence even though the event is not generated even with a slight impact.

As in the example of the gyro sensor as described above, the conventional event generation detection method, by simply comparing the value detected by the sensor with a predetermined reference value to determine whether the event occurs, the mounting of the electronic and electronic products equipped with the sensor In the case where the first detected value is changed according to the position or surrounding condition, there is a problem that can be recognized as an event occurrence even though it is not an actual event occurrence.

The technical problem to be achieved by the present invention is to solve the problems or the necessity as described above, in the case of the sensor that is initially detected value is changed according to the mounting position or the surrounding state of the electronic device equipped with the sensor accordingly It also provides an event occurrence detection method that changes the reference value to detect the event occurrence more accurately.

In order to solve this problem, according to the present invention, in the case of a sensor for the first detection value is changed according to the mounting position of the electronic or electronic product equipped with a sensor for detecting the occurrence of the event or the surrounding state, the installation of the electronic and electronic product The reference value is also changed according to the position or surrounding state, so that the changed reference value is compared with the currently detected value, so that an event occurrence can be detected more accurately regardless of the mounting position or surrounding state of the electronic / electrical product.

According to an aspect of the present invention, in the event generation detection method for detecting whether the event occurs by a sensor provided in the electronic and electrical product, the step of reading the previous reference value stored in the memory by receiving a sensing value from the sensor, sensing Obtaining a difference value between the value and the previous reference value, reading a determination value registered in the memory, and determining whether the event has occurred by checking whether the difference value is greater than the determination value. To provide.
In this case, the <previous reference value> reads a preceding unique difference value previously stored in the memory earlier than the <previous reference value>, and is stored in the memory earlier than the <previous reference value>. Reading a prior average value stored in advance, obtaining a mean value which is an average value of the preceding eigen difference value and the preceding average value thus read, and adding the average value and the eigenvalue of the sensor stored in the memory. Can be obtained in advance

The event detection method may include reading an inherent value of a sensor registered in a memory, obtaining an inherent difference value that is a difference value between a sensing value applied from the sensor and an inherent value of the sensor, and a previous inherent difference value stored in the memory. And reading a previous mean value, obtaining a mean value that is an average of a previous eigenvalue and a previous mean value, and adding a mean value and an eigenvalue of the sensor to obtain a new reference value.

The event detection method may further include obtaining a difference value from a reference value by receiving a next sensing value from a sensor, and determining whether the next event occurs by checking whether the difference value is greater than a determination value. do.

The initial value of the average value is '0', and the initial value of the reference value is the same as the intrinsic value of the sensor.

As described above, according to the present invention, the reference value is also changed according to the mounting position or the surrounding state of the electronic device equipped with the sensor to detect whether or not an event occurs by comparing the changed reference value with the currently detected value, thereby generating an actual event. In spite of this, the occurrence of the event can be detected more accurately regardless of the mounting position of the electronic or electronic product or the surrounding state so that it is not recognized as the occurrence of the event.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals denote like parts throughout the specification.

Throughout the specification, when a part is said to "include" a certain component, it means that it can further include other components, without excluding other components unless specifically stated otherwise. In addition, the terms “… unit”, “… unit”, “… module” described in the specification mean a unit that processes at least one function or operation, which may be implemented by hardware or software or a combination of hardware and software. Can be.

Now, an event occurrence detection method according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram showing a configuration for detecting an event occurrence according to an embodiment of the present invention.

As shown in FIG. 1, the configuration for detecting an event occurrence according to an embodiment of the present invention includes a sensor unit 100, a memory unit 200, and an event occurrence detection unit 300.

The sensor unit 100 may include a sensor (for example, a gyro sensor) provided in an electronic / electric product (for example, an image black box for a vehicle) mounted on an object (for example, a vehicle) to detect an event occurrence. The sensing value S _n , S _{n + 1} is applied to the event occurrence detection unit 300.

The memory unit 200 sets and stores a determination value T, which is a reference for determining that an event has occurred, and stores a unique sensing value P of the sensor itself. authorized sensing value from 100) (S _n) and the specific difference value determined for the difference between the specific value (P) (△ _n), before the specific difference value (△ _n-1) and the previous average values of (a _n-1 The average value (A _n ) of obtaining the average of), and the reference value (R _n ) obtained by adding the average value (A _n ) and the eigenvalue (P) are received from the event occurrence detection unit 300 and temporarily stored.

The event occurrence detection unit 300 obtains an intrinsic difference value Δ _n , an average value A _n , and a reference value R _n for use in detecting the next event occurrence and stores the result in the memory unit 200. . At this time, the event occurrence detecting unit 300 obtains an intrinsic difference value Δ _{n which} is a difference value between the sensing value S _n received from the sensor unit 100 and the intrinsic value P read from the memory unit 200. , seek the memory unit specific difference value from a previously read out from the _{(200) (△ n-1} ) and the previous average value, the average value (a _n) the average value of (a _n-1), a new average value (a _n) And the intrinsic value P read out from the memory unit 200 are added to obtain a reference value R _n .

The event occurrence detecting unit 300 receives the next sensing value S _{n + 1} from the sensor unit 100, reads the reference value R _n from the memory unit 200, and then reads the next sensing value S. _{n + 1} ) and the difference value D _{n + 1} is obtained between the reference value R _n and the determination value T is read from the memory unit 200, and the difference value D _{n + 1} is the determination value T. Check if it is abnormal than) to determine whether an event occurs.

Hereinafter, an event occurrence detection method according to an embodiment of the present invention will be described in detail with reference to the flowchart of FIG. 2.

First, in a state in which an electronic product (for example, a vehicle image black box) equipped with a sensor (for example, a gyro sensor) is mounted on an object (for example, a vehicle) to detect an event occurrence, the corresponding electronic The sensor operates by supplying power to the electrical product to drive the electronic and electrical product. Accordingly, the sensor unit 100 applies the sensing value S _n sensed by the sensor to the event occurrence detecting unit 300. Is given.

For example, if a vehicle video black box having a gyro sensor for detecting sudden braking, rapid start, collision, and contact of a vehicle is created in a vehicle, the vehicle video black box is driven by supplying power to the vehicle video black box. When the gyro sensor is operated, the current G value is detected and the detected G value is applied to the event generation detecting unit 300.

Accordingly, the event occurrence detecting unit 300 checks the sensing value S _n applied from the sensor unit 100 (S101), and the previous reference value R _n-1 stored in the memory unit 200. ) Is read (S102).
Here, the <previous reference value (R _n-1 )> stored in the memory unit 200 is <the previous reference value (R) according to the mounting position of the electronic or electronic product equipped with the sensor or the surrounding state. _n-2 )> is a new value obtained by changing the previous reference value (R _n-1 )> before the <previous reference value (R _n-1 )> is obtained (that is, R _n- Reading <priority intrinsic difference value Δn _-2 ) previously stored in the memory unit 200 earlier than the value of ₁ ), before <previous reference value _Rn-1 > is obtained. (I.e., earlier than the value of R _n-1 ), reading <preceding average value A _n-2 > previously stored in the memory unit 200, and the preceding <unique difference value Δ _n thus read. _a-2)> and <preceding average values (a _n-2)> the average value (a _n-1) and a memory unit 200, and finding an average value (a _n-1), average value, and, thus obtained the By adding the unique value (P) of the stored sensor It becomes the pre-determined in advance (specific procedure to obtain these previous reference value (R _n-1) is similar to the process of obtaining a current reference value (R _n) referred to later, a detailed description thereof will be omitted ).

At this time, the event occurrence detection unit 300 is a sensing value (S _n ) applied from the sensor unit 100 and the previous reference value (R _n-1 ) read from the memory unit 200 as shown in Equation 1 below. The difference value D _n is obtained (S103).

D _n = S _n -R _n-1 |

The event occurrence detecting unit 300 reads the determination value T, which is preset and stored in the memory unit 200 (S104). Here, the determination value (T) is a value for determining that an event has occurred in the event occurrence detecting unit 300. The determination value T is set in advance through various experiments and tests, and then the memory unit 200. The value registered in. In addition, it is to be understood that the determination value T may be directly changed by the user at the discretion of the user. For example, the gyro sensor used in the vehicle image black box may be set to 0.4G, 0.5G, 0.6G, etc. according to the user's inclination.

The event occurrence detection unit 300 detects whether an event occurs by checking whether the difference value D _n obtained in the above-described step S103 is greater than or equal to the determination value T read from the memory unit 200 (S105). ).

If the difference value D _n is smaller than the determination value T in the above-described step S105, it is not determined that an event has occurred, while the difference value D _n is the determination value T in the above-described step S105. If it is greater than or equal to, it is determined that the event occurs to perform the operation of the electronic and electrical products accordingly (S106).

For example, in the case of the gyro sensor used in the vehicle image black box, if the difference value (D _n ) is 0.6G and the determination value is 0.5G, it is determined that an event occurs and the main controller of the vehicle image black box is informed to the main controller. The controller may store the image before and after the time when the event is notified as an event.

Then, the event occurrence detection unit 300 may present a current intrinsic difference value Δ _n , a current average value A _n , and a current reference value R _n for use in detecting the next event occurrence. Obtained and stored in the memory unit 200.

First, the event occurrence detection unit 300 reads the intrinsic value P of the sensor stored in the memory unit 200 (S107), and then from the sensor unit 100 as shown in Equation 2 below. An inherent difference value DELTA _{n that} is a difference value between the applied sensing value S _n and the intrinsic value P of the sensor read from the memory unit 200 is obtained (S108).

△ _n = | S _n -P |

Here, the intrinsic value (P) of the sensor is a unique sensing value of the sensor. If the electronic device equipped with the sensor is theoretically correctly mounted on an object to detect an event occurrence, it is first detected by the actual sensor. It will have the same value as the sensing value (S ₁ ).

For example, in the case of the gyro sensor provided in the vehicle image black box, the intrinsic G value P of the gyro sensor is set to '0' in the X axis direction (left and right directions) and G in the Y axis direction (up and down directions). It has a unique value of '1' for the value and '0' for the G value in the Z-axis direction. In addition, if the vehicle video black box is mounted so that the vehicle is parked and the parked road is exactly horizontal and vertical on a very flat place, the G value (S ₁ ) first detected by the gyro sensor is also the unique value of the gyro sensor (P). ) Can be the same.

However, depending on the user, the mounting position or direction of the vehicle video black box may be different, and the vehicle parking lot road condition may be different when the vehicle video black box is mounted, so in reality, the G value detected by the gyro sensor (S ₁ ) Is different from the gyro sensor's unique G value (P).

Therefore, to compensate for the difference between the G value (S ₁ ) initially detected by the gyro sensor and the inherent G value (P) of the gyro sensor, that is, the new reference value (R _n) in order to to detect whether an event occurs, the event occurrence detection unit 300 calculates a current average value (a _n) as shown below, the intrinsic value of the average value of the calculated the current (a _n) sensor (P In addition to obtaining the new reference value (R _n ), it is used to detect the next event occurrence.

In addition, even when the vehicle is driving, the G value (S _n ) that the gyro sensor detects on the average according to the state of the road (for example, a sloped road, an uphill road, a downhill road, etc.) is a unique G value of the gyro sensor. There can be many differences from (P), in which a new reference value (R _n ) is obtained to approximate the G value (S _n ) that the gyro sensor detects on average and used to detect the next event occurrence. .

Secondly, the event occurrence detecting unit 300 reads the previous inherent difference value Δn _-1 and the previous average value A _n-1 stored in the memory unit 200 (S109). ) obtains the memory unit (specific difference value from a previously read out of the 200) (△ _n-1) and the previous average value (an average value (a _n) the average value of a _n-1) as shown in equation 3 below, (S110).

A _n = (△ _n-1 + A _n-1 ) / 2

Here, the initial average value A ₁ is defined as '0'.

Third, the event occurrence detecting unit 300 adds the new average value A _n obtained in step S110 described above and the inherent value P of the sensor read from the memory unit 200 as shown in Equation 4 below. A new reference value R _n is obtained (S111).

R _n = A _n + P

Here, it is defined that the first reference value R ₀ and the first reference value R ₁ are equal to the intrinsic value P of the sensor.

In addition, the event occurrence detection unit 300 uses the new inherent difference value Δ _n , the average value A _n , and the reference value R _n obtained as described above in order to detect the next event occurrence. 200) (S112).

Thereafter, the event occurrence detecting unit 300 returns to the above-described step S101 to repeat the above-described processes. First, the next sensing value S _{n + 1} is applied from the sensor unit 100 to the memory unit ( next it determined that the difference value (D _{n + 1)} reads out the new reference value (R _n) which is stored in 200), whether or not the calculated difference value (D _{n + 1)} or more than the determined value (T) By checking, the next event is detected.

For example, when the vehicle video black box equipped with the gyro sensor is initially installed in the vehicle, the first sensing value S ₁ is first detected in the Y-axis direction (up and down direction) of the gyro sensor because the user does not mount it correctly. Is 1.4G, and the second sensing value S ₂ is 1.4G, the third sensing value S ₃ is 1.4G, the fourth sensing value S ₄ is 1.4G, and the determination value T In the case of 0.5G, the above-described processes will be described again.

First, whether the first event is generated by receiving the first sensing value S ₁ is determined by Equation 1 | S ₁ -R ₀ | = | 1.4-1 | to find the difference value (D ₁ ) '0.4', and then check whether it is greater than the determination value (T). At this time, since the difference value (D ₂ ) is '0.4' and the determination value (T) is 0.5G, the difference value (D ₂ ) is smaller than the determination value (T) and thus no event occurs. Here, the first previous reference value (R ₀ ) is equal to '1' because it is equal to the intrinsic value (P) of the sensor.

In order to detect the occurrence of the second event, | S ₁ -P | = | 1.4-1 | to obtain a first intrinsic difference value Δ ₁ of '0.4' and store it in the memory unit 200. In addition, since the initial average value A ₁ is '0' and the initial reference value R ₁ is the same as the intrinsic value P of the sensor, it becomes '1'.

Accordingly, the second sensing value S ₂ is applied to determine whether the second event occurs. According to Equation 1, | S ₂ -R ₁ | = | 1.4-1 | to find the difference value (D ₂ ) '0.4', and then check whether it is greater than the determination value (T). At this time, since the difference value (D ₂ ) is '0.4' and the determination value (T) is 0.5G, the difference value (D ₂ ) is smaller than the determination value (T) and thus no event occurs.

In order to detect the occurrence of the third event, Equation 2 shows that | S ₂ -P | = | 1.4-1 | to obtain a second intrinsic difference value Δ ₂ of '0.4' and store it in the memory unit 200. Further, a second average value A ₂ of '0.2' is obtained by Equation 3 as (△ ₁ + A ₁ ) / 2 = (0.4 + 0) / 2, and A ₂ + P according to Equation 4 above. The second reference value R ₂ having '1.2' as = 0.2 + 1 is obtained and stored in the memory unit 200, respectively.

Accordingly, the third sensing value S ₃ is applied to determine whether the third event occurs. According to Equation 1, | S ₃ -R ₂ | = | 1.4-1.2 |, and find the difference value (D ₃ ) '0.2', and then check whether it is greater than the determination value (T). At this time, since the difference value (D ₃ ) is '0.2' and the determination value (T) is 0.5G, the difference value (D ₃ ) is smaller than the determination value (T), and thus no event occurs.

In order to detect the fourth event occurrence, | S ₃ -P | = | 1.4-1 | to obtain a third intrinsic difference value Δ ₃ of '0.4' and store it in the memory unit 200. Further, a third average value A ₃ of 0.3 is obtained by (△ ₂ + A ₂ ) / 2 = (0.4 + 0.2) / 2 by Equation 3, and A ₃ + P by Equation 4 above. The third reference value R ₃ having '1.3' as = 0.3 + 1 is obtained and stored in the memory unit 200, respectively.

Then, the fourth sensing value S ₄ is received to check whether the fourth event occurs. According to Equation 1, | S ₄ -R ₃ | = | 1.4-1.3 | to find the difference value (D ₄ ) '0.1', and then check whether it is greater than the determination value (T). At this time, since the difference value (D ₄ ) is '0.1' and the determination value (T) is 0.5G, the difference value (D ₄ ) is smaller than the determination value (T) and thus no event occurs.

In order to detect the fifth event occurrence, | S ₄ -P | = | 1.4-1 | to obtain a fourth intrinsic difference value Δ ₄ of '0.4' and store it in the memory unit 200. In addition, a fourth average value A ₄ of which 0.35 is obtained by (△ ₃ + A ₃ ) / 2 = (0.4 + 0.3) / 2 by Equation 3, and A ₄ + P by Equation 4 above. The fourth reference value R ₄ having '1.35' as = 0.35 + 1 is obtained and stored in the memory unit 200, respectively. Alternatively, the fourth average value A ₄ becomes '0.4' and the fourth reference value R ₄ becomes '1.4' by rounding the calculation to two decimal places for ease of calculation and quick processing.

As described above, it can be seen that the reference value R _n is gradually approached to '1.4', which is the first incorrectly mounted and detected value S ₁ . In other words, the mounting position or direction of the vehicle video black box may be different depending on the user, and the vehicle parking lot road condition may be different when the vehicle video black box is mounted, and thus the sensing first detected by the gyro sensor The value S ₁ is inevitably different from the inherent value P of the gyro sensor. To compensate for this, the reference value R _n is gradually changed to the _first sensing value S ₁ .

If the fifth sensing value S ₅ is 1.6G, if the fifth sensing value S ₅ is not performed as in the above-described embodiment of the present invention, it will naturally be determined that an event occurs, but according to the embodiment of the present invention, Since R ₄ ) is '1.35', it is not judged as an event occurrence.

On the other hand, if the fifth sensing value S ₅ is 1.85G, that is, | S ₅ -R ₄ | = | 1.95 - 1.35 | after obtaining the difference values (D ₅₎ '0.5' to, it is checked whether more than a determined value (T). At this time, since the difference value (D ₅ ) is '0.5' and the determination value (T) is 0.5G, it is determined that the event has occurred because the difference value (D ₅ ) is greater than the determination value (T).

In the above-described embodiment of the present invention, the reference value is also changed according to the mounting position or the surrounding state of the electronic appliance equipped with the sensor to detect whether an event occurs by comparing the changed reference value with the currently detected value. Even though it is not an event occurrence, an event occurrence detection method was described so that an event occurrence can be detected more accurately by applying a mounting position or an ambient state of an electronic and electrical product so that it is not recognized as an event occurrence.

However, embodiments of the present invention are not implemented only through the above-described apparatus and / or method, but implemented through a program for realizing a function corresponding to the configuration of the embodiment of the present invention, a recording medium on which the program is recorded, and the like. Such an implementation may be easily implemented by those skilled in the art to which the present disclosure pertains based on the description of the above-described embodiments.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

1 is a block diagram showing a configuration for detecting an event occurrence according to an embodiment of the present invention.

2 is a flowchart illustrating a method of detecting an event occurrence according to an exemplary embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

100: sensor

200: memory

300: event occurrence detection unit

Claims (4)

In the event detection method for detecting whether the event occurs by a sensor provided in the electronic or electrical product, Receiving a sensing value (S _n ) from the sensor and reading a previous reference value (R _n-1 ) stored in a memory; Obtaining a difference value D _n between the sensing value S _n and the previous reference value R _n-1 ; Reading the determination value T registered in the memory, and Determining whether an event occurs by checking whether the difference value D _n is greater than or equal to the determination value T, The previous reference value (R _n-1 ) is Reading a preceding unique difference value Δn _-2 previously stored in the memory, Reading a preceding average value A _n-2 previously stored in the memory; Obtaining an average value A _n-1 , which is an average value of the preceding eigen difference value Δ _n-2 and the preceding average value A _n-2 , and And obtaining the mean value (A _n-1 ) and the inherent value (P) of the sensor. The method of claim 1, Reading the unique value P of the sensor registered in the memory, Obtaining a difference value unique difference (△ _n) between the sensing value is received from the sensor (S _n) and a unique value of the sensor (P), Reading a previous inherent difference value Δn _-1 and a previous average value A _n-1 stored in the memory, And finding an average value (A _n) the average value of the previously-specific difference value (△ _n-1) and the previous average values of (A _n-1), and Obtaining a new reference value R _n by adding the average value A _n and the inherent value P of the sensor; Event occurrence detection method further comprising. 3. The method of claim 2, Receiving a next sensing value (S _{n + 1} ) from the sensor to obtain a difference value (D _{n + 1} ) from the reference value (R _n ), Determining whether the next event occurs by checking whether the difference value D _{n + 1} is greater than or equal to the determination value T; Event occurrence detection method further comprising. 3. The method of claim 2, The initial value A ₁ of the average value A _n is '0', and the initial value R ₁ of the reference value R _n is the same as the intrinsic value P of the sensor. How to detect event occurrence.

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