JP2508364B2 - Waveform discriminator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION << Industrial Application Field >> The present invention relates to a waveform discriminating apparatus that discriminates whether or not a specific input wave has arrived by the attribute of the input wave, for example, by detecting vibration and arrival of seismic waves. The present invention relates to a waveform discriminating apparatus that discriminates whether a seismic wave has arrived by discriminating between vibration and other vibrations.

<< Prior Art >> As a conventional device of this type, for example, a seismic detector for discriminating seismic waves is known. In order to discriminate whether or not an input wave is a seismic wave, a detector, a counter, a timer and a comparator are known. Is equipped with.

In this example, when an input wave is detected by the detector, the timer starts counting the time and initializes the counter, and the counter counts the number of waves having a certain period or more.

Then, after the elapse of a certain time, when the time measurement is finished, the count value counted by the counter is output to the comparator during this time, and if the count value is equal to or more than the predetermined value, the input wave is discriminated as a seismic wave.

<< Problems to be Solved by the Invention >> However, in the conventional device as described above, it is possible to determine whether or not there is an earthquake only by counting the number of input waves having a fixed period or more input within a fixed time period. Is going on
Since only a very small part of the waveform data of the input wave is used for the discrimination, only rough discrimination can be made, and there is a problem that the input wave other than the seismic wave is also discriminated as the seismic wave.

The present invention has been made in view of the conventional problems as described above, and a first object of the present invention is to stop determining the attribute of the input wave only by the pulse count value, and use another data to detect the input wave. It is to provide a waveform discriminating apparatus for discriminating attributes (common to claims 1 to 4).

A second object is to provide a waveform discriminating apparatus that discriminates the attribute of an input wave by using the data obtained from the length of the pulse ON signal and the length of the pulse OFF signal together with the number of pulses counted within a fixed time. Yes (corresponding to claim 1).

The third purpose is to use the length of the previously measured ON signal and the length of the ON signal measured this time, and the length of the OFF signal measured last time and the length of the OFF signal measured this time to determine the attribute of a specific input wave. The object is to provide a waveform discriminating apparatus that discriminates the attribute of an input wave by creating data specific to (corresponding to claim 2).

A fourth object is to provide a waveform discriminating apparatus in which the accuracy of seismic wave waveform discrimination is improved (corresponding to claim 3).

A fifth object is to provide a waveform discriminating apparatus in which the accuracy of discriminating an attribute of an input wave is improved by using fuzzy inference (corresponding to claim 4).

<< Means for Solving the Problems >> In order to achieve the first and second objects, the present invention provides a detector for detecting an input wave and outputting an ON / OFF pulse signal, and a detector for detecting the input wave. In a waveform discriminating apparatus including a discriminating unit that discriminates the attribute of an input wave based on an ON / OFF pulse signal that is output, the discriminating unit determines the number of pulse signals output from the detector within a certain period of time. A pulse number storage means for storing, an ON time measuring means for measuring the ON time of each of the ON pulse signals of the pulse signals output from the detector within a fixed time, and the ON time measuring means An ON time maximum value storage means for storing the maximum value in the ON time, and an OFF time for each OFF pulse signal of the pulse signals output from the detector within a fixed time
F time measuring means, and OFF time maximum value storage means for storing the maximum value of the OFF time measured by the OFF time measuring means, the number of pulse signals stored in the pulse number storage means The larger the ON time maximum value stored in the ON time maximum value storage means and the larger the OFF time maximum value stored in the OFF time maximum value storage means, the more specific the It is characterized by determining that

In order to achieve the above first and third objects, a detector that detects an input wave and outputs an ON / OFF pulse signal,
In the waveform discriminating apparatus provided with a discriminating means for discriminating the attribute of the input wave based on the ON / OFF pulse signal output from the detector, the discriminating means is a pulse signal output from the detector. ON time measuring means for measuring the ON time of the ON pulse signal, and ON for storing the ON time measured by the ON time measuring means
When the ON time is measured by the time storage means and the ON time measuring means,
ON time ratio calculation means for calculating the current ON time ratio measured by the ON time measurement means with respect to the previous ON time stored in the ON time storage means, and calculated by the ON time ratio calculation means within a fixed time ON time ratio maximum value storage means for storing the maximum value of the ON time ratio, OFF time measuring means for measuring the OFF time of the OFF pulse signal among the pulse signals output from the detector, and the OFF time Memorize the OFF time measured by the measuring means
Each time the OFF time is stored in the OFF time storage means and the OFF time measurement means, the ratio of the present OFF time measured by the OFF time measurement means to the previous OFF time stored in the OFF time storage means OFF time ratio calculation means for calculating the
OFF time ratio maximum value storage means for storing the maximum value of the time ratio, and the ON time ratio maximum value stored in the ON time ratio maximum value storage means being large or the OFF time ratio maximum value storage means It is characterized in that the attribute of the input wave is determined to be a specific input wave because the maximum value of the OFF time ratio stored in is large.

In order to achieve the first and fourth objects, the waveform discriminating apparatus according to claim 1 or 2, wherein the attribute of the input wave is a seismic wave.

In order to achieve the first and fifth objects, the waveform discriminating device according to claim 1, wherein the discriminating means discriminates the attribute of the input wave by executing fuzzy inference. It is characterized by doing.

<< Operation >> In the present invention, a detector that detects an input wave and outputs an ON / OFF pulse signal, and an ON / OFF output from this detector
A discriminating means for discriminating the attribute of the input wave based on the OFF pulse signal is provided.

Here, in the discrimination means, the pulse number storage means stores the number of pulse signals output from the detector within a fixed time.

Then, the ON time measuring means measures the ON time of each of the ON pulse signals of the pulse signals output from the detector within a fixed time, and the ON time maximum value storage means is measured by the ON time measuring means. The maximum value of ON time is stored.

Further, the OFF time measuring means measures the OFF time of each of the OFF pulse signals of the pulse signals output from the detector within a fixed time, and the OFF time maximum value storage means
The maximum value of the OFF time measured by the OFF time measuring means is stored.

The discriminating means has a large number of pulse signals stored in the pulse number storage means and a large ON time maximum value stored in the ON time maximum value storage means, and further, the OFF time maximum value storage means. It is determined that the attribute of the input wave is a specific input wave as the OFF time maximum value stored in is larger (corresponding to claim 1).

Further, in the present invention, a detector that detects an input wave and outputs an ON / OFF pulse signal, and a discriminating means that discriminates the attribute of the input wave based on the ON / OFF pulse signal output from the detector Equipped with.

Here, the determining means is an ON time measuring means that turns ON the ON pulse signal of the pulse signals output from the detector.
The ON time storage means stores the ON time measured by the ON time measuring means, and the ON time ratio calculating means stores the ON time each time the ON time is measured by the ON time measuring means.
The current ON time ratio measured by the ON time measuring means with respect to the previous ON time stored in the time storage means is calculated. Then, the ON time ratio maximum value storage means stores the maximum value of the ON time ratio calculated by the ON time ratio calculation means during a fixed time.

Further, the discrimination means is an O-pulse of the OFF pulse signal of the pulse signals output from the detector by the OFF time measuring means.
The FF time is measured, and the OFF time storage means stores the OFF time measured by the OFF time measuring means, and the OFF time ratio calculating means stores the OFF time each time the OFF time is measured by the OFF time measuring means. This time OFF measured by the OFF time measuring means against the previous OFF time stored in the time storage means
Calculate the time ratio. Then, the OFF time ratio maximum value storage means stores the O calculated by the OFF time ratio calculation means during a fixed time.
The maximum value of FF time ratio is stored.

The determination means is such that the ON time ratio maximum value stored in the ON time ratio maximum value storage means is large or
It is determined that the attribute of the input wave is a specific input wave because the maximum OFF time ratio maximum value stored in the maximum OFF time ratio storage means is large (corresponding to claim 2).

Here, in any of the above inventions, the attribute of the input wave can be seismic wave (corresponding to claim 3).

Further, the discrimination means can discriminate the attribute of the input wave by executing fuzzy inference (corresponding to claim 4).

<< Description of Embodiments >> Hereinafter, the present invention will be described with reference to the drawings. In the following description, the case where the present invention is applied to seismic wave discrimination will be described.

FIG. 1 is a block diagram showing the overall configuration of a preferred embodiment to which the present invention is applied.

As shown in the figure, the waveform discriminating apparatus according to the present invention includes a detector 1 for detecting an input wave E, and a plurality of pulse waves P by converting the input wave E detected by the detector 1 into a pulse wave P. A feature amount extraction unit 2 for extracting a feature amount and an inference unit 3 for determining the attribute of the input wave E by executing fuzzy inference using various feature amounts extracted by the feature amount extraction unit 2 as input data. ing.

The above is the overall configuration of the present embodiment. Next, the configuration of the present embodiment will be described in further detail with reference to the drawings starting from FIG.

2 is a sectional view showing the details of the detector 1,
As the detector 1, an automatic horizontal seismic sensor as shown in the figure can be used. Since the seismic sensor as shown in the figure is well known in the art and is not directly related to the gist of the present invention, only the names of the members in the drawings will be pointed out below.

That is, 11 is a case, 12 is a guide, 13 is a plunger, 1
4 is a base (insert), 15 is a metal fitting, 16 is a cap, 17 is a jig, 18 is a ring, 20 is a case, 21 is a terminal, 22 is a movable piece, 23
Is a contact point and 24 is a steel ball.

Next, FIG. 3 is a functional block diagram of the feature quantity extraction unit 2. The feature quantity extraction unit 2 produces a pulse wave P as shown in FIG. 4 based on the input wave E detected by the detector 1. Generate,
Various characteristic quantities are extracted based on this pulse wave P.

Therefore, the feature quantity extraction unit 2 is, as shown in the figure, a counting function 2a, a timing function 2b, a program function 2c, and a calculation function 2d.
And the extracted feature amount data D is transmitted to the inference unit 3.

By the way, in the present embodiment, when the pulse wave P as shown in FIG. 4 is obtained, the feature amount extraction unit 2 uses the above-mentioned functions to obtain the following five feature amounts within a predetermined time period. Extracting.

(1) Number of pulses (2) Maximum value of pulse ON time (3) Maximum value of pulse OFF time (4) Maximum value of ON time ratio (5) Maximum value of OFF time ratio Now, referring to FIG. When the input wave E is detected at t ₁ and the first pulse P ₁ rises, the rising condition of each pulse is examined within the time period of 3 seconds.

Here, the number of pulses in (1) is P ₁ , P ₂ , P ₃ , P in this example.
Since ₄ of the four pulses are detected is four.

Next, the maximum value of pulse ON time in (2) is 4 pulses
_{P 1, P 2, P 3} , those from P ₄ of the ON time _{T 1, T 2, T 3} , T ₄ of the maximum is selected, since T ₂ In this example the maximum, ON time maximum value T ₂ Becomes

Similarly, the maximum pulse OFF time of (3) is selected from among the times T ₅ , T ₆ , and T ₇ between each pulse. In this example, T ₇ is the maximum, so the maximum OFF time is Becomes T ₇ .

Since the maximum OFF time is measured only for the time between each pulse, the time T ₈ from the fall of the last pulse T ₄ to the end of the time measured for 3 seconds is not adopted as the OFF time.

 Next, the maximum value of the ON time ratio of (4) is selected from the maximum ON time ratio calculated by the following equation (1) ON time ratio = current ON time / previous ON time (1).

Therefore, in this example, the largest one is selected from T ₂ / T ₁ , T ₃ / T ₂ , and T ₄ / T ₃ .

 The maximum OFF time ratio of (5) is selected from the maximum OFF time ratio calculated by the following equation (2) OFF time ratio = current OFF time / previous OFF time (2).

Therefore, in this example, the largest one is selected from T ₆ / T ₅ and T ₇ / T ₆ .

When the number of detected pulses is 1, the maximum value of the ON time ratio in (4) and the maximum value of the OFF time ratio in (5) are set to 0.

The above is the configuration of the detector 1 and the feature amount extraction unit 2,
The inference unit 3 determines the attribute of the input wave by executing fuzzy inference using the five feature amount data extracted by the feature amount extracting unit 2 as input data. Referring to the flowchart in Figure 9,
The calculation processing procedure of each of the feature amounts in the feature amount extraction unit 2 will be described.

FIG. 5 is a flowchart showing the procedure for calculating the number of pulses in (1).

In this process, when the program is started, it is checked whether the input signal is ON (step 10
0), if ON, the timer is started (step 102), the counter value is 1 and the flag is 1 (step 104).

Next, it is checked whether the timer is running (step 10
6) If the input signal is ON and the flag is 0 during the timer operation (YES at steps 106, 108 and 110), the counter is incremented (step 112).

Then, when the determination in step 106 becomes NO and the fixed time counting ends, the counter value at that time is set as the pulse number (step 116).

Next, FIG. 6 shows the maximum ON time of (2) and (3) and
It is a flow chart which shows a calculation processing procedure of an OFF time maximum value.

In the figure, the ON time maximum value and the OFF time maximum value are obtained in one step for convenience of explanation, but they are actually obtained separately. Therefore, in the following description, only the processing procedure for obtaining the ON time maximum value will be described in order to omit redundant description, but the OFF time maximum value can also be obtained by the same processing procedure.

The process shown in FIG. 6 is performed by step 10 in FIG.
This is performed following the processing of 0 and 102. First, in step 200, the ON time of the first detected pulse is the temporary ON time maximum value.
on-max.

Subsequently, in step 202, it is checked whether or not the timer is operating, and if the timer is operating, the ON time of the pulse detected next is determined (step 204).

Next, in step 206, the ON time detected in step 204 and the provisional ON time maximum value on-max detected up to that time are compared, and if the newly detected ON time is larger, on-max. Is updated (step 208).

In this way, the temporary maximum ON time during the timer operation is on
The value of −max is sequentially updated, and the maximum on−max during the predetermined time period is calculated as the maximum ON time value (step 210).

Next, FIG. 7 is a flowchart showing the details of step 204 in FIG.

In this process, first, the value of the timer at the pulse rise when the input signal is ON is stored as time (step 30
0) When the input signal is turned off (YES in step 302), the on time is obtained from step 304, and the value of the timer at that time is stored as time.

Next, when the input signal is turned on (YES in step 306),
The OFF time is obtained from step 308.

In the process of step 310, when the timer stop is detected, the process of step 312 is performed, and while the timer is operating, the processes of steps 300 to 308 are repeated to sequentially detect the ON time and the OFF time.

Next, FIG. 8 is a flowchart showing the procedure for calculating the maximum value of the ON time ratio and the maximum value of the OFF time ratio in (4) and (5).

Also in FIG. 8, the ON time ratio maximum value and the OFF time ratio maximum value are obtained in one step for convenience of description, but they are actually obtained separately.

Therefore, in the following description, only the processing procedure for obtaining the ON time maximum value will be described, but the OFF time ratio maximum value can also be obtained by exactly the same processing procedure.

Similar to the process shown in FIG. 6, the process in FIG. 8 is also performed following the processes of steps 100 and 102 shown in FIG.

Then, in step 400, the first calculated ON
The time ratio is set to the provisional ON time ratio maximum value on ratio −max, and while the timer is operating (YES in step 402), the ON time ratio is sequentially calculated (step 404), and the temporary ON time calculated up to that point When the ratio maximum value on ratio −max is exceeded (YES in step 406),
The provisional ON time ratio maximum value on ratio −max is updated (step 4
08).

In this way, the temporary ON time ratio maximum value is updated while the timer is operating, and the maximum ON ratio −max during a fixed time is
Is calculated as the maximum value of the ON time ratio (step 410).

Next, FIG. 9 is a flowchart showing details of step 404 in FIG.

In this process, it is first checked whether the counter value is 2 or more (step 500). If the counter value is 2 or more, the ON time at the previous detection is on time “a”, and the OFF time is off time.
Let it be "a" (step 502).

Then, on time, off
The time (steps 506 and 508) is calculated, and the ON time ratio and the OFF time ratio are obtained by calculating the equation in step 510.

The above is the processing procedure when the feature amount extraction unit 2 extracts five feature amounts.

By the way, as a result of earnest studies by the inventors of the present application, the following relationships exist between the five feature amounts detected by the feature amount detecting unit 2 and the attributes of the input wave as described above.

That is, Fig. 10 shows the relationship between the number of pulses and the attributes of the input wave. Fig. 10 (a) shows the case where the input wave is a seismic wave, and Fig. 10 (b) shows the case of a malfunction. It can be seen that the total number of pulses is large when the wave is a seismic wave, while the total number of pulses of the input wave is small when the wave is malfunctioning.

Next, Fig. 11 shows the relationship between the ON time or OFF time of the pulse and the attribute of the input wave. (A) is the case where the input wave is a seismic wave, and (b) is the case of malfunction. , If the input wave is a seismic wave, the ON time or
It can be seen that the maximum value of the OFF time increases while the maximum value of the ON time or the OFF time decreases in the case of a malfunction as shown in (b).

Fig. 12 shows the relationship between the ON time ratio (solid line) or OFF time ratio (score) and the attribute of the input wave. Fig. 12 (a) shows the case where the input wave is a seismic wave. (B) shows the case of malfunction, and as shown in (a) of the figure, it can be seen that the maximum values of the ON time ratio and the OFF time ratio become large when the input wave is a seismic wave.

Therefore, membership functions for the number of pulses, maximum ON time, maximum OFF time, maximum ON time ratio, and maximum OFF time ratio are provided as shown in Figs. 13 (a) to 13 (e), and fuzzy In this embodiment, a rule is created and the attribute of the input wave is determined based on the five feature amount data extracted by the feature amount extracting unit 2.

Rule 1 if on Maximum time ratio = Large then Judgment = earthquake Rule 2 if off Maximum time ratio = Large then Judgment = Earthquake Rule 3 if Number of pulses = Large and on Maximum time value = Large then Judgment = Earthquake Rule 4 if on Time maximum value = small and off Time maximum value = small then Judgment = Malfunction Rule 5 if off Time maximum value = Large then Judgment = Earthquake Rule 6 if Number of pulses = Small then Judgment = Malfunction In this case, rule 1 The membership function of MF _{1 in} (d) is used, and the maximum degree of ON time ratio calculated by the feature amount extraction unit 2 is applied to calculate the goodness of fit.

In Rule 2, the membership function of MF _{2 in} FIG. 13 (e) is used, and the fitness is calculated in the same manner.

In rule 3, the membership function of MF _{3 in} FIG. 13 (a) and the membership function of MF ₄ in FIG. 13 (b) are used, and the goodness of fit is calculated by AND (logical product).

In rule 4, the membership functions of MF ₅ and MF ₆ of FIGS. 13B and 13C are used, and the fitness by AND (logical product) of both membership functions is calculated.

Further, in rule 5, the membership function of MF _{7 in} FIG. 13 (c) is used to calculate the goodness of fit.

In rule 6, the membership function of MF _{8 in} FIG. 13 (d) is used to calculate the goodness of fit.

In this way, when the goodness of fit in each rule is calculated,
For example, the inference result can be obtained as shown in FIG.

In the figure, the closer the judgment value J is to -1, the higher the possibility of malfunction, and the closer the judgment value J is to 1, the higher the possibility of an earthquake.

And in this example, the suitability of the judgment that it is an earthquake using rules 1, 2, 3, and 5 is S ₁ (0.54), and the suitability of the judgment that it is a malfunction using rules 4 and 6 is In the case of S ₂ (1), the judgment value J is J ₀ (−0.3).

By the way, a judgment value J closer to -1 indicates a malfunction, and a judgment value J closer to 1 indicates a seismic wave.

Therefore, for example, if the judgment value J is a positive number, it may be judged as an earthquake, and if the judgment value J is a negative number, it may be judged as an erroneous operation. If it is a malfunction, and if the judgment value J is in the range of 0.2 to 1, it can be discriminated as an earthquake wave, and a more accurate discrimination process for the attribute of the input wave can be performed.

As described above, in this embodiment, five feature amount data that characterize whether or not the input wave is a seismic wave are extracted, a membership function having these feature amount data as input values is created, and the membership function Create multiple rules that result in a judgment using the function to be "earthquake" or "malfunction", and when input waves are obtained, perform fuzzy inference based on the goodness of fit of these rules to determine the attributes of the input waves. Since this is done, a determination result that comprehensively considers a plurality of feature amount data can be obtained, and the attribute of the input wave can be determined with high accuracy.

<< Effects of the Invention >> As described above, the waveform discrimination apparatus according to the present invention is
The attribute of the input wave is determined by using the data obtained from the length of the pulse ON signal and the length of the pulse OFF signal together with the number of pulses counted within a fixed time, so that the attribute of the input wave can be determined with high accuracy. (Corresponding to item 1).

In addition, the waveform discrimination device according to the present invention,
Using the length of the signal and the length of the ON signal measured this time, and the length of the OFF signal measured last time and the length of the OFF signal measured this time, data specific to the attribute of the specific input wave is created. Since the attribute of is determined, the attribute of the input wave can be determined with high accuracy (corresponding to claim 2).

Further, the waveform discriminating apparatus according to the present invention is suitable for discriminating seismic waves (corresponding to claim 3).

Further, since the waveform discriminating apparatus according to the present invention discriminates the attribute of the input wave by executing the fuzzy inference, it is possible to discriminate the attribute of the input wave with high accuracy (corresponding to claim 4).

[Brief description of drawings]

FIG. 1 is a block diagram showing an overall configuration of an embodiment to which the present invention is applied, FIG. 2 is a detailed sectional view of a detector in FIG. 1, and FIG. 3 is a functional block of a feature quantity extraction unit in FIG. 4 and 5 are explanatory diagrams of pulse waves generated by the feature amount extraction unit, FIG. 5 is a flowchart showing a procedure for calculating the number of pulses, and FIG. 6 is processing for calculating the maximum ON time value and the maximum OFF time value. Fig. 7 is a flowchart showing the procedure, Fig. 7 is a flowchart showing the details of the calculation processing procedure of the ON time and OFF time in Fig. 6, and Fig. 8 is a flowchart showing the calculation processing procedure of the ON time ratio maximum value and the OFF time ratio maximum value. , FIG. 9 is a flow chart showing the details of the calculation processing procedure of the ON time ratio and the OFF time ratio in FIG. 8, FIG. 10 is an explanatory view showing the relationship between the pulse number and the attribute of the input wave, and FIG. 11 is ON. Time and
Explanatory diagram showing the relation between OFF time and input wave attribute, FIG. 12 is an explanatory diagram showing relation between ON time ratio maximum value and OFF time ratio maximum value and input wave attribute, FIG. 13 is the present embodiment FIG. 14 is an explanatory diagram of the membership function used in, and FIG. 14 is an explanatory diagram of the inference result. 1 ... Detector 2 ... Feature amount extraction section 3 ... Inference section E ... Input wave P ... Pulse wave

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hideyuki Bingo, Omron Co., Ltd., 10 No.10 Hanazono Todo-cho, Ukyo-ku, Kyoto City, Kyoto Prefecture (56) References JP-A 1-272925 (JP, A) JP-A 1- 274018 (JP, A) JP-A-2-143126 (JP, A)

Claims (4)

(57) [Claims] 1. A detector that detects an input wave and outputs an ON / OFF pulse signal, and an ON / OFF output from this detector
In the waveform discriminating apparatus including a discriminating means for discriminating the attribute of the input wave on the basis of the pulse signal, the discriminating means stores the number of pulse signals output from the detector within a certain time. And an ON time measuring means for measuring the ON time of each of the ON pulse signals of the pulse signals output within a fixed time from the detector, and the maximum of the ON times measured by the ON time measuring means ON time maximum value storage means for storing a value, and OFF for measuring each OFF time of an OFF pulse signal among pulse signals output from the detector within a fixed time
A time measuring means, and an OFF time maximum value storing means for storing the maximum value among the OFF times measured by the OFF time measuring means, wherein the number of pulse signals stored in the pulse number storing means is The larger the ON time maximum value stored in the ON time maximum value storage means is, and the larger the OFF time maximum value stored in the OFF time maximum value storage means is, the attribute of the input wave is a specific input wave. A waveform discriminating apparatus characterized by discriminating that there is. 2. A detector for detecting an input wave and outputting an ON / OFF pulse signal, and an ON / OFF output from this detector.
In the waveform discriminating apparatus including a discriminating unit that discriminates the attribute of the input wave based on the pulse signal, the discriminating unit measures ON time of the ON pulse signal among the pulse signals output from the detector. Time measuring means, ON time storing means for storing the ON time measured by the ON time measuring means, and ON time each time the ON time is measured by the ON time measuring means.
An ON time ratio calculation means for calculating the current ON time ratio measured by the ON time measurement means with respect to the previous ON time stored in the time storage means, and an ON time ratio calculation means for a certain period of time. ON time ratio maximum value storage means for storing the maximum value of the ON time ratio, OFF time measurement means for measuring the OFF time of the OFF pulse signal of the pulse signals output from the detector, and the OFF time measurement OF that stores the OFF time measured by the method
Each time the OFF time is measured by the F time storage means and the OFF time measurement means,
OFF time ratio calculation means for calculating the current OFF time ratio measured by the OFF time measurement means with respect to the previous OFF time stored in the OFF time storage means, and calculated by the OFF time ratio calculation means within a fixed time The OFF time ratio maximum value storage means for storing the maximum value of the OFF time ratio stored, the ON time ratio maximum value stored in the ON time ratio maximum value storage means being large or the OFF time ratio maximum A waveform discriminating apparatus characterized by discriminating that an attribute of an input wave is a specific input wave because the maximum value of the OFF time ratio stored in the value storage means is large. 3. The waveform discriminating device according to claim 1, wherein the attribute of the input wave is seismic wave. 4. The waveform discriminating apparatus according to claim 1, wherein the discriminating means discriminates the attribute of the input wave by executing fuzzy inference.