JPH11286380A - Burglar alarm device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an incorrect alarming of a burglar alarm device by detecting only the sound generated from a burglar alarm generating means of a narrow frequency width such as a burglar alarm or the like, on the basis of its sound volume level and the frequency while discriminating the same from the other sound. SOLUTION: First of all, whether the spectrally decomposed sound volume level L is more than a first threshold value A or not is judged by a high-speed Fourier transformer (ST1). When it is less than the first threshold value (L<A) (NO), the procedure is returned to START, and when it is more than the first threshold value A (L>=A) (YES), the width of frequency is analyzed (ST2). Whether the frequency width (w) is a specific narrow frequency width of a burglar alarm or the like, that is, less than a specific value W, or not is judged (ST3). When the judgement is w>W (NO), the sound is judged not to be the burglar alarm sound but to be the noise, and the procedure is returned to START, when the judgement is w<=W (YES), the sound is judged to be the burglar alarm sound generated from the burglar alarm or the like (ST5), and the procedure is completed. Whereby the wrong alarming of the burglar alarming device can be prevented, and the reliability can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a security device for preventing crime in an elevator car using a security bell or the like.

[0002]

2. Description of the Related Art In recent years, the number of violent incidents and demon incidents has increased, and security has been reduced. Therefore, an increasing number of people have self-defense measures in possession of crime prevention bells and the like. However, in an elevator such as an apartment, crime is likely to occur due to the closed room, but since the inside of the elevator car has high soundproofing, there is a low possibility that an outside person will notice even if the security bell rings.

In order to solve such a problem, Japanese Patent Laid-Open No.
Japanese Patent Application Laid-Open No. 8-104883 discloses that an elevator car is provided with a sensor that detects a certain level of swinging of the car and a sensor that detects a certain level or more of volume inside the car. There is described a security device configured to activate an external alarm device based on at least one detection result.

As another solution, a detector for detecting the reflection of a light beam through a prism having a wide solid angle is disposed in an elevator car, and the reflection of a shining weapon such as a knife is detected to detect an external security bell. A device for sounding has been proposed.

[0005] However, such a device also reacts to the reflection of female accessories and has a problem that malfunctions are likely to occur.

Japanese Unexamined Patent Application Publication No. Sho 59-43779 discloses a security device which is less likely to malfunction as described above, and includes a plurality of microphones for detecting a constant impact sound at an appropriate position on a wall other than a door mounting portion in an elevator car. At the right place of the car and at required places in the building, an alarm that operates when the microphone detects the impact sound is provided, and a control device that switches the elevator to each floor stop operation when the microphone detects the impact sound is installed. A security device in an elevator is described in which a hitting sound generated when a woman hits a car wall with a high heel or an elbow to detect an alarm such as a security bell is described.

[0007]

However, in any of the above-mentioned prior arts, if a child or the like makes a loud noise in the elevator car or the car shakes, false reports are likely to occur and the reliability is lacking. There was a problem.

The present invention is intended to solve the above-mentioned problems of the prior art, and prevents false alarms based on the volume level and frequency of a sound generated by a security sound generator having a narrow frequency width such as a security bell. It is an object of the present invention to provide a security device with significantly improved reliability.

[0009]

SUMMARY OF THE INVENTION The present invention focuses on the volume level and frequency of a sound generated by a security sound generator having a narrow frequency width such as a security bell, and determines the volume level, that is, the peak value of the frequency spectrum. When the frequency width is equal to or more than the threshold value and the frequency width is equal to or less than a predetermined value, or when this state continues for more than a predetermined time, it is determined that the security sound is sounding (abnormal).

More specifically, the security device according to the first aspect of the present invention provides a security sound generating means capable of generating a sound with a narrow frequency width, a sound detecting means for detecting a sound, and a sound detecting means for detecting the sound. Abnormality determining means for determining whether an abnormality has occurred based on the volume level and frequency width of the sound.

The security device according to the second aspect of the present invention further includes an alarm unit that generates an alarm when the abnormality determination unit determines that an abnormality has occurred.

According to a third aspect of the present invention, the abnormality determining means compares the volume level and frequency width of the sound detected by the sound detecting means with a predetermined threshold value and a predetermined value, respectively. When the level is equal to or higher than the predetermined threshold and the frequency width is equal to or lower than the predetermined value, it is determined that an abnormality has occurred.

According to a fourth aspect of the present invention, the abnormality determining means compares the volume level and the frequency width of the sound detected by the sound detecting means with a predetermined threshold value and a predetermined value, respectively. If the state where the level is equal to or more than the predetermined threshold value and the frequency width is equal to or less than the predetermined value continues for more than a predetermined time, it is determined that an abnormality has occurred.

According to a fifth aspect of the present invention, the abnormality determining means compares the volume level of the sound detected by the sound detecting means with a first threshold value and a second threshold value smaller than the first threshold value. Comparing the frequency width with a predetermined value, an abnormality occurs when the volume level is equal to or higher than the first threshold value and the frequency width is equal to or lower than the predetermined value continues for more than a predetermined time. It is further determined that an abnormality has occurred even when the state in which the frequency width is equal to or less than the predetermined value and the volume level is greater than the second threshold continues for more than a predetermined time. It is to judge.

According to a sixth aspect of the present invention, in the crime prevention apparatus, the abnormality determining means amplifies the sound detected by the sound detecting means, a converting means for converting an output of the amplifier into a frequency spectrum, A determination circuit for determining whether an abnormality has occurred based on the volume level and frequency width of the frequency spectrum generated by the conversion means.

[0016]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a diagram showing a schematic configuration when a security device according to the present invention is applied to an elevator for security.

In FIG. 1, 1 is an elevator car,
The car 1 is connected to a driving device 3 such as a motor via an elevating mechanism 2 including a pulley and a rope, and the driving device 3 is automatically controlled by a control device 5 to control an elevator car. 1 is driven up and down via a lifting mechanism 2.

The control device 5 is provided with abnormality judging means 6 for detecting a security sound of a narrow frequency width generated by a security bell as a security sound generation means carried by a person in the elevator car 1. The abnormality judging means 6 is connected to an alarm means (not shown) such as a buzzer or an alarm display device in the control room 7 and detects a crime prevention sound generated by a crime prevention bell or the like in the elevator car 1. At this time, the alarm means is activated to generate an alarm.

A microphone 9 as a sound detecting means for detecting a sound in the car 1 is provided at an appropriate position on the car 1 of the elevator.
The microphone 9 can communicate with abnormality determination means 6 provided in the control device 5 by wireless communication or the like.

FIG. 2 is a block diagram showing the configuration of the abnormality determining means of the security device of the present invention. As shown in FIG. 2, the abnormality determination means 6 includes an amplifier 11 for amplifying the volume of sound collected by the microphone 9 in the elevator car 1 and transmitted by wireless communication or the like, and an output of the amplifier 11 being subjected to a fast Fourier transform to obtain a frequency. A fast Fourier transformer (FFT) 13 as a transforming means for decomposing into a spectrum, and a volume level spectrally decomposed by the fast Fourier transformer 13 are compared with a first threshold A and a second threshold B (see FIG. 5). Discriminating circuit 15 for discriminating only a sound in a specific narrow frequency band such as a security bell
And outputs the output of the discrimination circuit 15 to an alarm device such as a buzzer in the control room 7 to generate an alarm, or outputs the output to the driving device 3 to move the elevator to the nearest floor, stop the elevator, and then open it. And an output circuit 17 that opens the door.

FIG. 3 shows a discriminating circuit 1 of a security device according to the present invention.
5 is a flowchart showing the operation of the fifth embodiment, FIG. 4 is a diagram showing a frequency spectrum of a sound of a security bell as an example of a security sound generating means, and FIG. 5 is a waveform diagram showing a volume level of the security bell; 5, the vertical axis indicates the volume level, and the horizontal axis indicates the elapsed time.

Next, the operation of the discrimination circuit 15 according to the first embodiment will be described with reference to the flowchart of FIG. First, the volume level L spectrally decomposed by the fast Fourier transformer 13 is compared with a first threshold value A (see FIG. 5) to determine whether or not the volume level L is equal to or greater than the first threshold value A (step ST1). If less than the first threshold value A (L <A) (N
O), returning to the start, and if it is equal to or more than the first threshold value A (L ≧
A) (YES), a frequency width analysis is performed (step ST)
2) It is determined whether or not the frequency width w is equal to or less than a specific narrow frequency width of a security bell or the like, that is, a predetermined value W (step ST3). If this determination result is w> W (NO), it is determined that the sound is not a sound of the security bell but a noise (step ST).
4) Returning to the start, if w ≦ W (YES), it is determined that a security sound is generated by a security bell or the like (step S)
T5) The process ends.

In this manner, only a security sound with a narrow frequency width generated by a security bell or the like can be detected and determined from other sounds based on the volume level and the frequency. It is possible to improve the reliability.

FIG. 6 shows a discrimination circuit 1 of the security device according to the present invention.
14 is a flowchart showing an operation of the fifth embodiment 2;

In the operation of the first embodiment shown in FIG. 3, it is determined that an abnormality occurs even when a security bell or the like temporarily malfunctions. However, the second embodiment avoids such an erroneous determination. Thus, the detection accuracy is improved.

The operation of the second embodiment will be described with reference to the flowchart of FIG. 6. Steps ST11 to ST14 are steps ST1 to ST14 of FIG.
Same as T4.

If it is determined in step ST13 that the frequency width w is equal to or less than the predetermined value W, the process proceeds to step S13.
At T15, the duration of the voice is checked. That is, in step ST15, it is determined whether or not the continuation time t of the sound having the narrow frequency width exceeds the predetermined value T.
(T> T), it is determined that there is an abnormality (the crime prevention bell is sounding continuously rather than temporarily), an abnormal output is output from the determination circuit 15 to the output circuit 17, and the process is terminated. . On the other hand, when it is determined in step ST15 that the duration t has ended without exceeding the predetermined value T (t ≦ T),
Judge as a temporary malfunction of the security bell and return to start.

As described above, the sound volume level and the frequency width are compared with the first threshold value and the predetermined value, respectively, and the state in which the sound volume level is equal to or more than the first threshold value and the frequency width is equal to or less than the predetermined value exceeds the predetermined time. It is possible to prevent erroneous detection due to a temporary malfunction of a burglar alarm, etc., and to further improve the detection accuracy of burglar alarms by determining that an abnormality has occurred when the alarm has been continued. is there.

FIG. 7 shows a discrimination circuit 1 of the security device according to the present invention.
15 is a flowchart showing the operation of the fifth embodiment of the present invention.

In the operation of the second embodiment shown in FIG. 6, even if the security bell continues to ring, the security bell is covered with hands, clothes, etc., and the volume level collected by the microphone 9 is smaller than normal. If the value falls below the first threshold value A, it is determined that there is no abnormality in spite of the fact that the security bell continues to ring, but the third embodiment avoids erroneous determination even in such a case and performs detection. The accuracy is further improved.

The operation of the third embodiment will be described with reference to the flowchart of FIG. 7. Steps ST21 to ST25 are the same as steps ST11 to ST15 of FIG.

If it is determined in step ST25 that the duration time t is equal to or shorter than the predetermined value T, then in step ST26
It is determined whether or not the volume level L is equal to or smaller than a second threshold B smaller than the first threshold A. If the volume level L is equal to or smaller than the second threshold B, (L
.Ltoreq.B) (YES), it is determined that there is no abnormality, and the process returns to the start. If the value exceeds the second threshold value B (L> B), there is a possibility that there is an abnormality. It is determined whether or not t exceeds a predetermined value T, and thereafter, the duration t exceeds the predetermined value T and it is determined that there is an abnormality in step ST27, or the volume level L becomes equal to or less than the second threshold B in step ST26. The processing of steps ST25 and ST26 is repeated until it is determined that it has become true.
The reason for this is that, as described above, when the crime prevention bell or the like is covered with hands or covered with clothes and the volume of the crime prevention sound is lower than usual, the volume level becomes the second as shown in FIG. A second threshold B smaller than the first threshold A but lower than the first threshold A
Therefore, it is determined whether or not the volume level L decreases or does not decrease with the passage of time. If the volume level L falls below the second threshold value with the passage of time, it is determined that the sound level L is in the normal range. On the other hand, if the sound level L exceeds the second threshold value B even after the predetermined time T has elapsed, a security sound is emitted instead of a temporary abnormality, but the volume level is lower than usual. This is to improve the accuracy and reliability of the abnormality determination.

As described above, when the determination circuit 15 determines that an abnormality has occurred, an output signal indicating an abnormality is output to the output circuit 1.
7, an abnormal signal is transmitted from the output circuit 17 to the management room 7, and an alarm device such as a buzzer is activated to generate an alarm such as an alarm sound or an alarm display.

At the same time, the driving circuit 3
To control the operation of the driving device 3 to move the elevator car 1 up and down via the elevating mechanism 2, move the car 1 to the nearest floor, and automatically open the elevator door. It may be.

In the above description, a case has been described in which the present invention is implemented as a security device for an elevator. However, the present invention is not limited to this, and a device for discriminating sounds in a specific frequency band such as a security bell. The present invention can be applied to a wide variety of systems and systems in general, and can detect only a specific sound such as a burglar alarm with extremely high accuracy even in a closed room or in other environmental conditions including noise.

The present invention is not limited to the sound of a security bell,
Anything that emits a sound having a frequency spectrum with a specific narrow frequency band can be distinguished only from the sound. This can be applied to discrimination.

[0038]

As described above, according to the present invention, only a sound generated by a security sound generator having a narrow frequency width, such as a security bell, is distinguished from other sounds based on its volume level and frequency. As a result, false alarm of the security device can be prevented, and the reliability can be greatly improved.

Further, the abnormality determination means compares the volume level and frequency width of the sound detected by the sound detection means with a predetermined threshold value and a predetermined value, respectively, so that the volume level is not less than the predetermined threshold value and By judging that an abnormality has occurred when the frequency width is equal to or less than the predetermined value, it is possible to reliably detect only the security sound generated by the security sound generating means.

Further, the abnormal level judging means compares the volume level and frequency width of the sound detected by the sound detecting means with a predetermined threshold value and a predetermined value, respectively, so that the volume level is equal to or higher than the predetermined threshold value and By determining that an abnormality has occurred when the state in which the frequency width is equal to or less than the predetermined value continues for more than the predetermined time, erroneous detection due to temporary noise or the like is prevented, and the crime prevention sound is prevented. The detection accuracy can be improved.

Further, the abnormality determining means compares the volume level of the sound detected by the sound detecting means with the first threshold and a second threshold smaller than the first threshold, and compares the frequency width with a predetermined value. Determining that an abnormality has occurred when the state in which the volume level is equal to or greater than the first threshold value and the frequency width is equal to or less than the predetermined value continues for more than a predetermined time; Even when the state in which the width is equal to or less than the predetermined value and the volume level is larger than the second threshold continues for more than a predetermined time, it is determined that an abnormality has occurred. Even when the sound generating means is covered with hands, clothing, etc., and the generated security sound is smaller than usual, the security sound can be detected, and the detection accuracy can be further improved.

[Brief description of the drawings]

FIG. 1 is a schematic view of an elevator provided with a security device according to the present invention.

FIG. 2 is a block diagram illustrating a configuration of an abnormality determination unit of the security device according to the present invention.

FIG. 3 is a flowchart illustrating an operation of an abnormality determining unit according to the embodiment of the present invention.

FIG. 4 is a diagram illustrating a frequency spectrum of a sound of a security bell.

FIG. 5 is a waveform chart showing the volume level of the security bell.

FIG. 6 is a flowchart illustrating an operation of an abnormality determination unit according to another embodiment of the present invention.

FIG. 7 is a flowchart illustrating an operation of an abnormality determination unit according to still another embodiment of the present invention.

[Explanation of symbols]

1 elevator car, 2 elevator mechanism, 3 drive device,
5 control device, 6 abnormality judgment means, 7 control room, 9
Microphone (sound detection device), 11 amplifier, 13 fast Fourier transformer (conversion means), 15 discriminating circuit, 17
Output circuit.

Claims (6)

[Claims] 1. A security sound generating means capable of generating a sound having a narrow frequency width; a sound detecting means detecting a sound; and an abnormality occurring based on a sound volume level and a frequency width of the sound detected by the sound detecting means. A security device comprising: an abnormality determination unit that determines whether or not the security operation is performed. 2. The security device according to claim 1, further comprising an alarm unit that issues an alarm when the abnormality determination unit determines that an abnormality has occurred. 3. The abnormality determination unit compares a volume level and a frequency width of the sound detected by the sound detection unit with a predetermined threshold and a predetermined value, respectively, and the volume level is equal to or higher than the predetermined threshold. 2. The security device according to claim 1, wherein when the frequency width is equal to or less than the predetermined value, it is determined that an abnormality has occurred. 4. The abnormality determination unit compares the volume level and frequency width of the sound detected by the sound detection unit with a predetermined threshold and a predetermined value, respectively, and the volume level is equal to or higher than the predetermined threshold. 2. The security device according to claim 1, wherein when a state in which the frequency width is equal to or less than the predetermined value continues for more than a predetermined time, it is determined that an abnormality has occurred. 5. The abnormality determining means compares a volume level of the sound detected by the sound detecting means with a first threshold and a second threshold smaller than the first threshold, and compares a frequency width with a predetermined value. Determining that an abnormality has occurred when the state in which the volume level is equal to or higher than the first threshold value and the frequency width is equal to or lower than the predetermined value continues for more than a predetermined time; It is determined that an abnormality has occurred even when a state in which the frequency width is equal to or less than the predetermined value and the volume level is larger than the second threshold continues for more than a predetermined time. 1. The security device according to 1. 6. The abnormality determination unit includes: an amplifier that amplifies a sound detected by the sound detection unit; a conversion unit that converts an output of the amplifier into a frequency spectrum; and a frequency spectrum generated by the conversion unit. The security device according to claim 1, further comprising: a determination circuit configured to determine whether an abnormality has occurred based on the volume level and the frequency width.