JPH0365799A - Device for analyzing cause of accident at intersection - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an apparatus for analyzing the causes of accidents at intersections, which analyzes the causes of collisions involving two-sided collisions at intersections.

[Prior Art] In general, collisions between two people occur at intersections with traffic lights, and the cause of this is more likely to be caused by a traffic light that was previously green than by a car starting from a traffic light that has turned green. The problem is often caused by the car on the side of the road.In other words, if a car driving on the side of the road with a green light always keeps an eye on the green light, there will be no problem. When you reach a stoplight, you often follow the flow of traffic in front of you rather than following the traffic light, and in this case, you end up ignoring the traffic light. On the other hand, cars that had previously stopped at a red light will try to start as soon as possible when the light turns green. Cars on the side of the road where the light had previously been green often believe that they will naturally stop because the light has turned red, and often do not pay attention to that side of the road. As a result, the car that ignored the traffic light and the car that started immediately when the light turned green collide with each other.

In this case, the driver of the car on the road where the light was previously green believes that he or she saw the light and proceeded, and therefore claims that the light was green even when the collision occurred. Even if the person who caused the accident did not check the traffic lights right before the intersection, he did see a green light a little before the intersection, so he believed that he was following the traffic lights correctly, and even if there were witnesses at the time of the collision, he did not commit suicide. Since there is no change in the assertion of
The current situation is that unnecessary conflicts occur, resulting in great social loss.

At intersections where many accidents occur, surveillance cameras are installed to record endless images in an attempt to analyze the truth.

[Problem to be solved by the invention] However, this not only requires expensive equipment, but also has a limited recording lifespan, making it difficult to replace the recording tape frequently. The problem was that it could not be put to practical use.

[Means for Solving the Problems] In order to solve the above problems, the present invention includes an abnormality detector that generates a data storage signal when the acoustic signal is larger than a predetermined value, and an abnormality detector that normally records the signal present state. It is equipped with a temporary memory that stores the time as well as an audio signal when a data storage signal is supplied, and a means for transferring the contents of the temporary memory to the semiconductor memory after the storage of the audio information is completed. be.

[Function] Normally, the signal appearance state is stored together with the time, but when the microphone output is greater than a predetermined value, a data storage signal is generated from the abnormality detector, and the microphone output information is also temporarily stored in the memory. . Then, after the information storage of the microphone output is completed, the contents of the temporary memory are transferred to the semiconductor memory.

[Example] FIG. 3 is a diagram showing an intersection. Signal lamp devices 2 are provided at the four corners of the intersection 1, and the signal lamp devices 2 are controlled by a traffic signal 3. 4 is an accident cause analysis device. Reference numeral 5 denotes a microphone, which is installed toward the center of the intersection so that it can reliably detect the sound of a collision occurring within the intersection, and the acoustic information collected there is fed into the accident cause analysis device 4. .

FIG. 1 is a block diagram showing one embodiment of the present invention,
Acoustic information collected by the microphone 5 is amplified by an amplifier circuit 10 and supplied to a determination circuit 11.0 determination circuit 11
A filter circuit is installed to classify sound frequencies into four categories, and low frequencies, for example, below 300 Hz, are not included in the collision sound and are not allowed to pass through. Also, emergency vehicles pass by making a loud noise. Since this is known, the frequency band of the vehicle should not be allowed to pass through. Only the acoustic band generated during a collision is allowed to pass through.

For the signal obtained in this way, the determination circuit 11 performs the following:
Compared to the sound pressure level during the time when traffic noise is the loudest,
When the sound pressure level is 10 times higher, it is determined that a collision has occurred, and the A/D conversion circuit 12 is activated and a data storage signal is supplied to the control circuit 13. Therefore, the acoustic signal supplied from the amplifier circuit 10 to the A/D conversion circuit 12 is converted into a digital signal and supplied to the control circuit 13 as an abnormal acoustic signal.

The control circuit 13 constantly receives road signal indications from the traffic signal 3 and time signals from the clock circuit 14, and stores these signals in its internal temporary memory. Each signal stores the current time and signal display status at 1 second position, and
It is designed to be memorized for minutes. This is because one presentation is set to three minutes or less in a normal signal.

For times longer than 3 minutes, the memory contents are updated sequentially.
New times and signal manifestations are stored cyclically, and data from three minutes ago is erased by the overwritten data. In this way, the contents of the temporary memory are always retained for 3 minutes, and when a collision occurs at an intersection and a data storage signal is supplied from the determination circuit 11 to the control circuit 13, the temporary memory is stored for a predetermined period of time from that time. In other words, the acoustic signal is stored for a sufficiently short time (5 seconds in this example) compared to the temporary storage time, along with the signal presentation status and time signal, and after the predetermined period of time has elapsed, the contents of the temporary storage memory are stored for 3 minutes after 5 seconds have elapsed. The memory contents corresponding to are stored in the separately provided semiconductor memory 15. Thereafter, the above operation is repeated.

Normally, there is no problem with this configuration, but if a large truck or the like is loaded with large iron materials and suddenly brakes at an intersection, causing a loud noise, the judgment circuit may generate a data storage signal. be.

In such a case, it is assumed that the collision was an accident and the data is stored in the semiconductor memory. Therefore, semiconductor memory 1
5 indicates the signal manifestation indicated by symbol A and symbol B as shown in Fig. 2.
It is possible to store a total of 50 units of time information indicated by symbol C and acoustic information indicated by symbol C, and is configured to be able to be separated from the main body. In the semiconductor memory 15, each piece of data is sequentially stored, and when the number of stored data reaches 50 units, the first stored data is overwritten with new data, and the new data remains.
The information is stored in a so-called circular manner.

Therefore, even if an accident occurs and the same sound occurs up to 49 times after that, the sound and data of the accident will remain. Although this does not occur at normal intersections, there are multiple to be able to remember the events of
This is to increase certainty. Moreover, if this is done, it will be practical even if the value of the sound level to be determined is made small.

Generally, when an accident occurs in a city, police officers arrive at the scene within 10 minutes at the latest. Therefore, if there was no loud noise during that time, there would be no record of the incident after the accident, and if the time when the police report was accurately known, the time at which the accident occurred could be predicted within five minutes. Furthermore, if the loud sound occurred only once within five minutes, this indicates that the stored data represents the appearance at that time.

In addition, in order to ensure the accuracy of the 0 time, which allows the data at the time of the accident to be reliably identified if the parties involved in the accident or others can determine the time when the accident occurred with an accuracy of less than 5 minutes, the clock device uses radio time signals. I use something that is always revised on the hour.

Note that in this example, acoustic data is not always stored in order to save memory capacity, but if a semiconductor memory with a large capacity can be used, acoustic data can be constantly stored. In addition, this device is installed near a traffic signal, and when an accident occurs, it immediately goes to the scene, removes the semiconductor memory, attaches a replacement memory, puts the removed memory into a reading device, reads out the data, and reads the data. This is so that it can be recorded using a printer attached to the printing device. Since the output of the reading device can be directly connected to a personal computer, it can be analyzed immediately on site or the analysis results can be output to a printer.

[Effects of the Invention] As explained above, the present invention is capable of storing the signal display state along with time from before the accident to after the accident, and moreover, the signal display state and time can be stored for a predetermined period of time after the accident occurs. In addition to the time, the acoustic signal can also be stored, so the signal state at the time of the accident can be objectively reproduced, not just in the memories of the parties involved, which has the effect of preventing unnecessary disputes. .

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a diagram showing the storage contents of a semiconductor memory, and FIG. 3 is a diagram showing the supply arrangement of intersections. l... Intersection, 2... Signal lamp, 3... Traffic light, 4... Accident cause analysis device, 5... Microphone, 11... Judgment circuit, 13... Control circuit, 14
...Clock circuit, 15...Semiconductor memory.

Claims (1)

[Claims] A microphone that collects acoustic information at an intersection; a determination circuit that generates a data storage signal when it is detected that the collected acoustic information is abnormal acoustic information that is larger than a predetermined value; The displayed state is stored together with the current time in a periodic manner for at least one display period of the signal, and when the data storage signal is supplied, abnormal acoustic information is also stored for a sufficiently shorter period of time than the storage time of the temporary memory. a storage memory capable of storing a plurality of types of data in the temporary memory; and a data storage means that transfers the contents of the temporary memory to the storage memory and stores the data after storage of the abnormal acoustic information is completed. A device for analyzing the causes of accidents at intersections.