JP3024920B2 - Traffic monitoring equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention detects the occurrence of a traffic accident or the like with a microphone, recognizes the occurrence of the accident as soon as possible to facilitate traffic, and, if necessary, checks the situation before and after the occurrence of the accident or the like. The present invention relates to a traffic monitoring device that automatically saves and accumulates images and sounds to save labor and increase efficiency in on-site verification. It can also be used for security systems that use video.

[0002]

2. Description of the Related Art A conventional traffic accident situation recording apparatus will be described with reference to FIG. FIG. 9 shows, for example,
It is a block diagram which shows the "traffic accident situation recording device" shown in 338900.

In FIG. 1, 1 is a camera, 1a is a video signal output from the camera, 2 is a traffic signal, 7 is a microphone, 7a is a sound signal output from the microphone, 51 is a time character generator, and 52 is a signal light. Symbol generation unit, 53 is an addition unit, 5
4 is a collision sound detection circuit, 55 is a recording control device, 56 is an endless recording device, 57 is a magnetic recording / reproducing device, and 58 is a signal light blinking control device.

In the traffic accident situation recording device, the sound signal 7a from the microphone 7 disposed near the intersection and the video signal 1a from the camera 1 and the time character generator 51 and the signal lamp generator 52 at normal times. The video signal obtained by synthesizing the signal by the adder 53 is continuously recorded in the endless recording device 56.

When a collision occurs, the level of the sound signal 7a from the microphone 7 increases. When this level is equal to or higher than the threshold value, the collision sound detection circuit 54 determines that a collision has occurred and detects the collision. When a collision is detected, the recording control device 55
Of the magnetic recording / reproducing device 5
The recording operation of No. 7 is started, and returns to the original state after a predetermined time.

Therefore, the magnetic recording / reproducing device 57 holds video information, sound information, and signal light state information near the intersection before and after the collision.

The collision sound detection circuit 54 is provided with a band elimination filter for removing a frequency component of the siren in order to prevent a malfunction caused by a sound of a siren or the like of an ambulance.

FIG. 1 shows a conventional monitoring system.
This will be described with reference to FIG. FIG. 10 shows a configuration example of a conventional monitoring system of a traffic control center or the like. In the figure, 1 is a camera, 21a and 21b are video transmission paths, 60,
Reference numeral 61 denotes a character generation unit that generates characters of a camera installation location;
2, 63 are an adder, 64 is a display changeover switch, 65 is a monitor, and 66 is a control center controller.

In the monitoring system such as the traffic control center shown in FIG. 10, the operator switches the monitoring monitor 65 to the camera-installed intersection and monitors only when there is information from the installed intersection.

[0010]

In the conventional apparatus as described above, the microphone 7 and the camera 1 are usually installed at a high position on the road, and other parts except the microphone 7 and the camera 1 are used for maintenance and magnetic recording. In order to take out the recording medium of the reproducing apparatus, the recording apparatus is installed near the ground away from the microphone 7 and the camera 1. Therefore, during this time, the video signal 1a
And two signal lines are required for the sound signal 7a.

Although the recording capacity of the magnetic recording / reproducing device 57 is finite, there is a countermeasure against erroneous detection for the sound of the siren of an ambulance, but the collision detecting means is determined by the level of the signal from the microphone 7. In order to do so, it is necessary to mistakenly detect and record a collision other than the collision, such as the sound of an air hammer during construction, the noise of trucks and runaways, the horn, the exhaust noise of large trucks, and the vibration of cargo on the bed. Thus, it is fully conceivable that the number of records other than collisions will increase significantly. Therefore, when the recording medium (video tape or the like) of the magnetic recording / reproducing device 57 exceeds the recording capacity, the subsequent recording becomes impossible. To solve this, there is a problem that a plurality of storage devices are required at one intersection.

Furthermore, in the case of the conventional surveillance system, images of a large number of intersections (for example, 130 or more in the case of Tokyo) are always sent to the actual traffic control center using a dedicated line. Regardless, it is merely checking the information sent from the traffic congestion sensor and switching the camera 1 as needed to monitor the situation of the intersection. There has been a problem that it is almost impossible to instantly recognize the emergence and escape route of the tribe after the occurrence.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and can reduce the number of signal lines between a microphone, a camera and other components to one, and use a relatively inexpensive transmission line for remote control. It is an object of the present invention to obtain a traffic monitoring device capable of transmitting video and sound at a distance.

Further, according to the present invention, the situation before and after the occurrence of an accident or the like at a large number of intersections in a wide range can be automatically recorded and accumulated in one magnetic recording / reproducing apparatus by video and sound.
It is an object of the present invention to provide a traffic monitoring device capable of eliminating a recording error by issuing a warning before replacing the recording capacity of a recording medium (video tape or the like) of a magnetic recording / reproducing apparatus and replacing the recording medium.

Further, the present invention recognizes an accident or the like that occurs at a large number of intersections in a wide range at the same time as the occurrence,
It is an object of the present invention to obtain a traffic monitoring device that can quickly and appropriately deal with accidents and the like.

[0016]

According to a first aspect of the present invention , there is provided a traffic monitoring device which captures an image near an intersection on a terminal side.
A camera that outputs a shadowed video signal, and a camera installed at the intersection.
Signal status information detected by the
Image information that creates and outputs a character image signal containing information
A report character generator, and a video signal output from the camera.
A character image signal output from the non-image information character generator
And an adder that outputs an added video signal by adding
A microphone for observing nearby sounds and outputting a sound signal;
Time-compressed sound signal output from the
A sound compressor to be output, and a sound signal output from the microphone
Level and the band pass filter for accident sound detection.
The occurrence of a traffic accident is determined and a trigger signal indicating the occurrence of the accident is issued.
A discriminating unit for outputting the added video signal output from the adding unit.
No., the compressed sound signal output from the sound compression unit, and
Superimposes the trigger signal output from the discriminator and transmits the video
And a superimposing unit for outputting a superimposed video signal to the center side.
Contains the superimposed image transmitted by the image transmission path.
The compressed sound signal is separated from the signal and time-expanded to obtain an expanded sound signal.
Signal extension unit that outputs a signal,
The trigger signal superimposed on the superimposed video signal
A detection unit that outputs a recording stop signal when a signal is detected,
The superimposed video signal sent by the video transmission path and the
The expanded sound signal separated by the sound expansion unit is always
Continue to record endlessly in the memory.
When a recording stop signal is input, recording is performed after a first predetermined time.
Stop and stop recording based on the point at which the recording stop signal is input.
Endless playback state for a second predetermined time before and after
Output the reproduced superimposed video signal and expanded sound signal.
Endless recording and playback that outputs a recording stop signal
And a recording stop signal from the endless recording / reproducing unit.
When you recognize that an accident has occurred by entering a
A system control unit for outputting a command signal;
Based on the endless recording / reproducing unit.
Record the superimposed video signal and expanded sound signal for a predetermined time of 2.
And a storage unit for performing the operation.

In the traffic monitoring device according to a second aspect of the present invention, the terminal captures an image near the intersection and transmits the image to the terminal.
And a traffic light installed at the intersection
Signal status information and time and location information
Generation of non-video information characters that create and output text video signals
And a video signal output from the camera and the video
Adds the character video signal output from the information character generator
Adder that outputs an added video signal and the sound near the intersection
A microphone that outputs a sound signal by observing,
A sound that outputs a compressed sound signal by time-compressing the input sound signal
A compression unit; an addition video signal output from the addition unit;
And superimpose the compressed sound signal output from the sound compression unit.
A superimposition section for outputting a superimposed video signal to the image transmission path.
To the center, the video transmission path
Separate the compressed sound signal from the superimposed video signal and extend the time
A sound extension unit for outputting an extension sound signal;
The level of the extended sound signal and the band band
An accident occurs when a traffic accident is identified by a sfilter
A discrimination unit that outputs a recording stop signal indicating
The superimposed video signal and the sound expansion transmitted by a channel
The expanded sound signal separated by the section is always stored in the memory.
Endless recording is continued, and the recording stop signal is
When the number is input, the recording is stopped after a first predetermined time,
Before and after the time when the recording stop signal is input
It becomes the endless playback state for the second predetermined time, and
Outputs the generated superimposed video signal and expanded sound signal
Endless recording and playback unit that outputs a recording stop signal to the
Input of the recording stop signal from the endless recording / reproducing unit
When it recognizes that an accident has occurred, a recording command signal is issued.
A system control unit for outputting, based on the recording command signal,
The second predetermined signal output from the endless recording / reproducing unit.
To record the superimposed video signal and expanded sound signal for the specified time
And a part .

According to a third aspect of the present invention , there is provided the traffic monitoring device, wherein the terminal captures an image near the intersection.
A second camera for outputting a second video signal;
Second video signal output from the camera of
Add the character video signal output from the report character generator
A second addition unit that outputs a second addition video signal;
A second method of observing sound near the difference point and outputting a second sound signal
A microphone, and a second signal output from the second microphone
A second sound which outputs a second compressed sound signal by time-compressing the signal
A compression unit; and a second signal output from the second microphone.
Signal level and band pass filter for accident sound detection
A second trigger that determines the occurrence of a traffic accident and indicates the occurrence of the accident
A second determining unit that outputs a signal, and a second adding unit.
The second added video signal output from the second sound compression unit
A second compressed sound signal output from the
Superimposes the second trigger signal output from the
A second superposition unit for outputting a video signal, and the second superposition unit
The second superimposed video signal output from the
The endless recording is continued, and the second discriminating unit outputs the second
Is recorded after a first predetermined time when a trigger signal of
Is stopped, and based on the point in time when the second trigger signal is input,
Endless playback for the second predetermined time before and after that
State and outputs the reproduced second superimposed video signal
A second endless recording / reproducing unit and the second discriminating unit
When the second trigger signal is input, a transmission switching signal is output.
A terminal device control unit for inputting data from the terminal device control unit.
When the transmission switching signal is input, it is output from the superimposing unit.
From the second endless recording / reproducing unit
Switching to the output second superimposed video signal and transmitting the video
And a traffic control transmission switching unit for outputting to a road .

Further, in the traffic monitoring device according to a fourth aspect of the present invention , a plurality of monitors and a display
Display switching switch for switching between the plurality of monitors according to a switching signal.
And the system control unit includes the recording unit.
Recognize that an accident has occurred at an intersection by a stop signal
The display switching signal is output to display the
Select one of the recording and output the recording stop signal
The superimposed video signal and expanded sound signal of the endless recording / reproducing unit are
The display is output to the selected monitor .

In the traffic monitoring device according to a fifth aspect of the present invention , a remaining amount notification signal is input to the center.
And a recording medium remaining warning signal
And a system control unit, wherein the system control unit
The remaining amount of the recording medium is monitored based on the number of recordings in the stacking unit.
When the amount falls below a preset amount, the remaining amount notification signal
Is output .

[0021]

[0022]

In the traffic monitoring device according to the first aspect of the present invention , an image near the intersection is photographed on the terminal side and a video signal is generated.
And a traffic light installed at the intersection
Signal status information and time and location information
Non-video information character generator that creates and outputs text video signals
A video signal output from the camera and the video
Add the character video signal output from the report character generator
The addition unit that outputs the addition video signal and the sound near the intersection
A microphone for measuring and outputting a sound signal, and an output from the microphone
Sound pressure that outputs the compressed sound signal by time-compressing the compressed sound signal
Compression section, and the level of the sound signal output from the microphone.
Occurrence of traffic accident by bandpass filter for detecting late sound
Discriminator that discriminates and outputs a trigger signal indicating the occurrence of an accident
And the added video signal output from the adder, the sound pressure
The compressed sound signal output from the compression section and the
Superimposes the input trigger signal and superimposes it on the video transmission path.
And a superimposing section for outputting a signal.
From the superimposed video signal sent by the image transmission path
Separate the compressed sound signal, extend the time, and output the expanded sound signal
A sound decompressor and the weight transmitted by the video transmission path.
Detecting the trigger signal superimposed on the tatami mat video signal
And a detection unit that outputs a recording stop signal, and the video transmission path
To the superimposed video signal and the sound decompression unit
The expanded sound signal separated from the memory is always stored in the memory.
The dress recording continues, and the recording stop signal is output from the detection unit.
When input, the recording is stopped after a first predetermined time, and
Second time before and after the recording stop signal is input
Endless playback state for a predetermined time
Output the superimposed video signal and expanded sound signal
An endless recording / reproducing unit for outputting a recording stop signal;
Input of the recording stop signal from the
Outputs a recording command signal when it recognizes that an accident has occurred
A system control unit that performs
The second predetermined time output from the address recording / reproducing unit.
Since it has a storage unit for recording the superimposed video signal and extended sound signal for the interval, only one signal transmission path for the video signal and the audio signal is required, and it can be easily used in existing systems such as control centers. insert installation can der to is, also, a recording medium (e.g., videotape
Video and sound before and after an accident at various intersections
Numerous videos per intersection because only recorded
There is no need to search for tapes and there are few unnecessary images
Therefore, the search time can be reduced. Also detects the recording stop signal
In the order in which they were created,
It is possible to record images such as accidents without any loss of image quality or resolution.
I can .

In the traffic monitoring device according to a second aspect of the present invention, the terminal captures an image near the intersection.
And a camera that outputs a video signal, and is installed at the intersection.
Status information and time and location information
Information that creates and outputs a character video signal containing
A character generator, a video signal output from the camera,
The character video signal output from the non-video information character generator
And an addition unit that outputs an added video signal by adding
A microphone that observes nearby sounds and outputs a sound signal;
Time-compressed sound signal output from the
Sound compression unit to be applied, and the added image output from the addition unit
Signal and the compressed sound signal output from the sound compression unit.
And a superimposing unit that outputs a superimposed video signal to the video transmission path.
Provided to the center side by the video transmission path
Separating the compressed sound signal from the superimposed video signal
A sound expansion unit for expanding and outputting an expanded sound signal;
Level of the extended sound signal output from the
When the occurrence of a traffic accident is determined by the bandpass filter
A determination unit that outputs a recording stop signal indicating that an accident has occurred,
The superimposed video signal sent by the video transmission path and the
The expanded sound signal separated by the sound expansion unit is always
The endless recording continues in the memory, and the recording
When a recording stop signal is input, recording is performed after a first predetermined time.
Stop and stop recording based on the point at which the recording stop signal is input.
Endless playback state for a second predetermined time before and after
Output the reproduced superimposed video signal and expanded sound signal.
Endless recording and playback that outputs a recording stop signal
And a recording stop signal from the endless recording / reproducing unit.
When you recognize that an accident has occurred by entering a
A system control unit for outputting a command signal;
Based on the endless recording / reproducing unit.
Record the superimposed video signal and expanded sound signal for a predetermined time of 2.
And a storage unit that converts video and audio signals.
Only one route is required, and it can be used for existing control center and other systems.
Can be easily inserted and installed, and the recording medium (for example, video tape) records only the video and sound before and after the occurrence of an accident at various intersections. There is no need to search for, and the search time can be reduced because there are few unnecessary videos. Also, record stop
Image synthesis, image data compression, etc.
Recorded a video of such accident-free image quality and resolution low under the video by
Can be drawn.

In the traffic monitoring device according to a third aspect of the present invention, the terminal side displays an image near the intersection.
A second camera that captures an image and outputs a second video signal;
A second video signal output from the second camera and the second video signal;
The character and video signal output from the non-video information character generator
A second adder for adding and outputting a second added video signal
And outputs a second sound signal by observing the sound near the intersection.
And a second microphone output from the second microphone.
Time-compressing the second sound signal to output a second compressed sound signal
A second sound compression unit, and a signal output from the second microphone.
The level of the second sound signal and the bandpass filter for accident sound detection
Ruta to determine the occurrence of a traffic accident
A second determining unit that outputs a trigger signal of the second
A second addition video signal output from the addition unit,
A second compressed sound signal output from a sound compression unit;
Superimposing the second trigger signal output from the discriminating unit 2
A second superimposing unit that outputs a second superimposed video signal;
The second superimposed video signal output from the superimposition unit 2 is always
The endless recording to the memory,
When the second trigger signal is input from the first predetermined
After a time, the recording is stopped and the second trigger signal is input.
For a second predetermined time before and after the time
Address reproduction state, and the reproduced second superimposed video signal
A second endless recording / reproducing unit for outputting a signal,
Is transmitted when the second trigger signal is input from the determination unit of
A terminal device control unit for outputting a switching signal;
When the transmission switching signal is input from the control unit, the superimposing unit
The superimposed video signal output from the second endless recording
Switch to the second superimposed video signal output from the recording and playback unit
A control transmission switching unit for outputting to the video transmission path.
Only one signal transmission path for video and audio signals.
Can easily be inserted into existing systems such as control centers.
Storage media, and a recording medium (for example, videotape).
Video and sound before and after an accident at various intersections
Numerous videos per intersection because only recorded
There is no need to search for tapes and there are few unnecessary images
Therefore, the search time can be reduced. Also detects the recording stop signal
In the order in which they were created,
It is possible to record images such as accidents without any loss of image quality or resolution.
I can .

In the traffic monitoring device according to a fourth aspect of the present invention , a plurality of monitors are provided on the center side.
And a table for switching the plurality of monitors according to a display switching signal.
An indication changeover switch, the system control unit
Indicates that an accident occurred at an intersection due to the recording stop signal
, The display switching signal is output to display the current
Select one of the monitors that are not
And the superimposed video signal of the endless recording / reproducing unit
Since the expanded sound signal is displayed and output on the selected monitor ,
Operators can always search the status of many intersections with the eyes of the operator
And the intersection where the accident etc. occurred can be recognized .

In the traffic monitoring device according to a fifth aspect of the present invention, the center side is provided with a remaining amount notification signal.
A recording medium level warning signal that issues a recording medium level warning signal when input
A warning generating unit, wherein the system control unit
At the time, the remaining amount of the recording medium is monitored by the number of recordings in the storage unit
When the remaining amount falls below a predetermined amount, the remaining amount
Since the volume notification signal is output , the recording medium (eg, video
Tape) residual warning prevents recording mistakes .

[0027]

[0028]

【Example】

Embodiment 1 FIG. Hereinafter, the configuration of the first embodiment of the present invention will be described with reference to FIGS. 1, 2, and 3. FIG. FIG. 1 is a block diagram showing the overall configuration of Embodiment 1 of the present invention.
FIG. 2 is a block diagram illustrating a configuration of the superimposition unit and the sound compression unit according to the first embodiment. FIG. 3 is a block diagram illustrating a configuration of the sound decompression unit according to the first embodiment. In the drawings, the same reference numerals indicate the same or corresponding parts.

In FIG. 1, 1 is a camera, 1a and 1b are video signals near the intersection output from the camera 1, 2 is a traffic light, and 2a and 2b are signal status information detected from the traffic light 2. Reference numeral 17 denotes a terminal device installed at the intersection, 1
Reference numeral 8 denotes a center-side device installed in a centralized monitoring center or the like. Reference numeral 19 denotes a terminal-side device which has the same configuration as the terminal-side device 17 and is installed at a different intersection from the terminal-side device 17, and 20 denotes a center-side device 1 which has the same configuration as the center-side device 18.
8 is a center-side device installed in the same monitoring center as that of 8.

In FIG. 1, reference numerals 21a and 21b denote video transmission lines of, for example, NTT's inexpensive type 1 video transmission service.

Further, in the terminal device 17 of FIG.
Reference numeral 3 denotes a non-video information character generation unit, 3a and 3b denote text / video signals including information such as signal status, time, and location output from the non-video information character generation unit 3, 4 denotes an addition unit, and 4a and 4b denote video images. Signals 1a and 1b are added video signals 3a and 3b, and 5 is a superimposed portion. 5a and 5c are compressed sound signals 6a and 6b output from superimposed portion 5 and trigger signals 9a and 9b.
A superimposed video signal on which 9b is superimposed, 5b and 5d are synchronous outputs, 6 is a sound compressor, 6a and 6b are compressed sound signals output from the sound compressor 6, 7 is a microphone, and 7a and 7b are output from the microphone 7. The sound signal 9 is a discriminator, and 9a and 9b are trigger signals output from the discriminator 9 indicating the occurrence of an accident or the like.

In the center-side device 18 of FIG. 1, reference numeral 8 denotes a sound expanding unit, 8a and 8b denote expanded sound signals output from the sound expanding unit 8, 10 denotes an endless recording / reproducing unit,
Reference numerals a and 10c denote superimposed video signals and expanded sound signals output from the endless recording / reproducing unit 10, 10b and 10d denote recording stop signals output from the endless recording / reproducing unit 10, 40
Denotes a detection unit, and 40a and 40b denote recording stop signals output from the detection unit 40.

On the center side of the figure, reference numeral 11 denotes a system controller, 11a, 11b, 11c, 11d, 1
Reference numerals 1e and 11f denote signals output from the system control unit 11, and 11a and 11f denote endless recording / reproducing units 1.
A recording restart command signal for setting 0 to a recording restart state, 11b is a video selection signal for controlling the video selection switch 12, 11c is a recording command signal for setting the storage unit 15 to a recording state, and 11d is a display switch for controlling a display switch 14. Reference numeral 11e denotes a video tape remaining amount notification signal of the storage unit 13, 15 denotes a monitor, and 16 denotes a tape remaining amount warning generation unit.

In the superimposing section 5 of FIG. 2, reference numeral 22 denotes a synchronous separation, 23 denotes a sound / trigger superimposing section, and 24 denotes a line selector. Reference numeral 22a denotes a synchronization signal, and reference numeral 24a denotes a line number signal indicating the N-th scanning line.

In the sound compression section 6 shown in FIG. 1, reference numeral 25 denotes a PLL; 26, an oscillation circuit; 27, an A / D converter;
8, 29 are sound memories A and B, S1, S2, S3, S4
Is a switch. Reference numeral 25a denotes a color clock signal having a frequency four times as high as the color synchronization signal of the NTSC signal, 26a denotes a sound clock signal of about 40 KHz for digitally converting sound, and 27a denotes A / D converted sound data.

In FIG. 3, reference numeral 30 denotes a sound separation circuit for separating the compressed sound signal 6a superimposed on the N-th scanning line of the superimposed video signal 5a, 32 a synchronization separation, 34 a line selector, 32a a synchronization signal, 34a is a line number signal indicating the N-th scanning line, 35 is a PLL, 36 is an oscillation circuit,
8, 39 are sound memories A and B, S5, S6, S7, S8
Is a switch. Reference numeral 35a denotes a color clock signal having a frequency four times the frequency of the color synchronization signal of the NTSC signal, 36a denotes a sound clock signal of approximately 40 KHz for digitally converting sound, and 31 denotes a compressed sound signal 6a converted to an expanded sound signal 8a by D. / A
D / A to be converted.

First, the terminal equipment 17 installed at the intersection
Will be described with reference to FIG. FIG.
4 shows an example of a superimposed video signal. In the figure, 5a is a superimposed video signal in which a sound signal and a trigger signal are superimposed, 6a is a superimposed compressed sound signal, and 9a is a superimposed trigger signal.

The camera 1 is a camera that captures an image near the intersection or an existing traffic monitoring camera, and constantly outputs a video signal 1a near the intersection. The non-video information character generator 3 generates a video signal including the signal status information 2a detected by the traffic light 2 and information such as time and location, and outputs a character video signal 3a of the signal status, time and location. Adder 4
Outputs an added video signal 4a obtained by adding the text video signal 3a to the video signal 1a using an on-screen display IC or the like. The microphone 7 observes a sound near the intersection. The sound signal 7 a constantly output by the microphone 7 is output to the sound compression unit 6 and the determination unit 9.

The sound compression section 6 is configured, for example, as shown in FIG. The switches S1, S2, S3, and S4 are simultaneously switched to the contacts opposite to those in the figure, and are not independently switched.

The conversion clock of the A / D 27 and the writing to the two sound memories 28 and 29 are performed at about 40 KH having a frequency which is about twice the human audible frequency range which is the output of the oscillation circuit 26.
This is performed by the sound clock signal 26a of z. On the other hand, the reading of the two sound memories 28 and 29 is performed by the synchronization separation 22 of the superposition unit 5.
The horizontal sync signal 1 of the NTSC system TV standard which is the output of
The synchronization is performed at a high speed from a synchronizing output 5b, which is 5.75 KHz or a color synchronizing signal of about 3.58 MHz, to a color clock signal 25a of about 14.3 MHz having a frequency four times that of the color synchronizing signal generated by the PLL 25. As described above, the digital sound signal 27a is converted to the sound clock signal 26a by the sound memories 28, 2
9, the sound memory 28 not writing at the same time,
29 is read out using the color clock signal 25a, and the sound signal 7a is output as a time-compressed compressed sound signal 6a.

The discriminating section 9 discriminates the occurrence of a traffic accident or the like from the sound signal 7a using a sound level and a band-pass filter for detecting a sound such as an accident. When the occurrence of a traffic accident or the like is determined, a trigger signal 9a indicating the occurrence of the accident or the like is output.

The superimposing unit 5 superimposes the added video signal 4a output from the adding unit 4, the compressed sound signal 6a output from the sound compressing unit 6, and the trigger signal 9a output from the discriminating unit 9. It outputs a superimposed video signal 5a as shown in FIG.

As described above, the image near the intersection by the camera 1 or the existing traffic monitoring camera includes the signal state
Characters and the like indicating the time and place are superimposed, and the trigger signal 9a and the compressed sound signal 6a are superimposed on one another.
This is a superimposed video signal 5a that is a book signal. This signal 5a
Is composed of a sound decompression unit 8, a detection unit 40, and an endless recording / reproduction unit 10 installed at a centralized monitoring center or the like using, for example, the video transmission line 21a of the inexpensive type 1 video transmission service of NTT. The data is transmitted to the center device 18.

Next, the operation of the center device 18 for receiving the superimposed video signal 5a transmitted from the terminal device 17 will be described with reference to FIG. FIG. 5 shows the operation of the endless recording / reproducing unit 10. In the figure, those enclosed by squares are denoted by □ 1, □ 2, □ 3,... And represent video memories. Here, the description is made on the assumption that the recording is stopped in the video memory for 10 frames after the input of the trigger signal, and the number of frames after the input of the trigger signal can be arbitrarily changed.

The detector 40 constantly monitors whether or not the superimposed video signal 5a has a trigger signal. When a trigger signal is detected, a recording stop signal 40a is output. The sound decompression unit 8 performs the reverse operation described with reference to FIG. 2, as shown in FIG. The sound separating circuit 30 extracts the compressed sound signal 6a from the superimposed video signal 5a and outputs the expanded sound signal 8a. Thereby, the sound signal 7a near the intersection observed by the microphone 7 is reproduced. The reproduced expanded sound signal 8a is recorded in the endless recording / reproducing unit 10.

As shown in FIG. 5, the endless recording / reproducing section 10 always includes the superimposed video signal 5a and the expanded sound signal 8a in the order of □ 1, □ 2, □ 3. Endlessly recorded in the video memory. In the figure, t is an image recording interval. For example, if t = 1 second, it means that the image is continuously overwritten and recorded for 20 seconds at 1 second intervals. Although only one memory group is described in the figure, there are actually two memory groups having the same configuration for video and sound. Here, the recording stop signal 4 which is the output of the detection unit 40
When 0a is input, the recording is stopped after a preset time, and automatically enters an endless reproduction state, and the superimposed video signal and the expanded sound signal 10a are output. The system controller 11 is notified of whether an accident or the like has been recorded. At the same time, a recording command signal 11c is output from the system control unit 11 to the storage unit 13, and the superimposed video signal and the expanded sound signal 10a are recorded in the storage unit 13. After that, the system controller 11 has a recording restart command signal 11a.

As described above, the terminal device 17 and the center device 1
8 has been described, but the terminal-side device 19 and the center-side device 20 perform the same operation.

The system controller 11 controls the recording stop signal 10
When it is recognized at b or 10d whether an accident or the like has occurred at any of the intersections, the recording unit 13 is set to the recording state by the recording instruction signal 11c. Furthermore, the monitor 15 which is not currently displayed
Is selected, and the superimposed video signal and the expanded sound signal 10a or 10c of the endless recording / reproducing unit 10 that has output the recording stop signals 10b and 10d are converted to the display switching signal 11d.
To control the display changeover switch 14 to display. At the same time, the video selection switch 12 is turned on by the video selection signal 11b in the order in which the recording stop signal 10b or 10d is output.
, And the superimposed video signal and the expanded sound signal 10a or 10c are recorded once in the storage unit 13. After that, the endless recording / reproducing unit 10 continues the endless reproduction until the recording control instruction signals 11a and 11f are output from the system control unit 11. When the observer confirms the recording in the storage unit 13 and operates to return to the endless recording state in preparation for the next accident, when the recording restart instruction signals 11a and 11f are output, the original endless recording is returned. .

The system controller 11 monitors the remaining amount of the video tape from time to time according to the number of recordings in the storage unit 13, and outputs a remaining amount notification signal 11e when the remaining amount of the video tape becomes equal to or less than a predetermined amount. . When receiving the remaining amount notification signal 11e, the video tape remaining amount warning generator 16 issues a video tape remaining amount warning signal by an alarm (buzzer), lamp lighting (light), or the like, to urge the user to change the video tape.

The monitor 15 displays the superimposed video signal and the extended sound signal 10a or 10c of the endless recording / reproducing section 10 selected by the display changeover switch 14. However, there is a possibility that an accident or the like may occur at many intersections at once. Is extremely low, it is not necessary to prepare the monitors 15 by the number of the camera installation intersections. The storage unit 13 may be any recording medium having a large recording capacity such as a VTR. Video transmission path 21
The transmission lines a and 21b may be transmission lines (for example, NTT's inexpensive type 1 video transmission service) having a band necessary for transmitting a baseband NTSC signal or the like.

The terminal devices 17 and 19 are installed at different intersections. A new installation is required at an intersection where the camera 1 is not provided. However, at an intersection where a surveillance camera is already installed, an existing one is provided. Additional insertion can be made without affecting the device. Also, the center-side devices 18 and 2
0 is the same, and is installed for each transmission path from the camera installation intersection. Here, the case of the two terminal-side devices 17 and 19 and the transmission lines 21a and 21b has been described. However, if the number of camera installation intersections increases and the number of transmission lines increases, the center-side device may be further added.

In the first embodiment, the monitoring of the intersection is described. However, the monitoring may be performed on a road where the frequency of occurrence of an accident or the like is relatively high, such as a highway other than the intersection.

The effects of the first embodiment are summarized as follows. Since the occurrence of an accident at the intersection where this equipment is installed can be recognized early, it is possible to respond to the site more quickly than the report of the accident, etc., for example, to arrange an ambulance at an early stage and control the traffic flow by controlling the appropriate signal switching time. Smoothness can be measured.
In addition, since the details of the situation before and after the occurrence of the accident etc. remain in the video, the efficiency of on-site inspection, labor saving and worker safety can be measured. Furthermore, since only a video and a sound before and after the occurrence of an accident or the like at various intersections are recorded on a recording medium (for example, a video tape), it is not necessary to search a large number of video tapes for each intersection, and unnecessary. Search time can be reduced because there are few videos. Furthermore, a video tape remaining amount warning prevents a recording error. Further, only one transmission line for a video signal or the like may be used. The number of storage devices can be reduced as compared with one installation and one storage device. It can be inserted into existing control systems. Therefore, the system can be constructed at low cost and relatively easily.

Embodiment 2 FIG. Second Embodiment A second embodiment of the present invention will be described with reference to FIGS. FIG. 6 is a block diagram showing the overall configuration of the second embodiment of the present invention. Also,
FIG. 7 is a diagram illustrating an example of a superimposed video signal according to the second embodiment.

The difference from the first embodiment is that the discriminating section 9 is installed in the center devices 18 and 20. Therefore, the detection unit 40 of the center devices 18 and 20 becomes unnecessary. Hereinafter, only the operation of the device according to the above difference will be described,
Other operations are the same as those in the first embodiment.

The superimposing section 5 of the terminal-side device 17 superimposes the added video signal 4a output from the adding section 4 and the compressed sound signal 6a output from the sound compressing section 6, for example, as shown in FIG. The superimposed video signal 5a is output.

The discriminating section 9 of the center-side device 18 discriminates the occurrence of a traffic accident or the like from the extended sound signal 8a reproduced by the sound extending section 8 using a sound level and a band-pass filter for detecting the sound such as an accident. When the occurrence of a traffic accident or the like is determined, a trigger signal (recording stop signal) 9a indicating the occurrence of the accident or the like is output.

When the recording stop signal 9a output from the judging unit 9 is input, the endless recording / reproducing unit 10 stops recording after a preset time, and automatically enters the endless reproducing state, thereby superimposing the superimposed video signal and the decompression signal. In addition to outputting the sound signal 10a, the system control unit 11 determines which endless recording / reproducing unit 10 has recorded an accident or the like by the recording stop signal 10b.
Notify. At the same time, the storage unit 13 is sent from the system control unit 11.
The recording command signal 11c is output to the storage section 13 and the superimposed video signal and the expanded sound signal 10a are recorded in the storage section 13. After that, the system controller 11 has a recording restart command signal 11a.

Embodiment 3 FIG. Third Embodiment A third embodiment of the present invention will be described with reference to FIG. FIG. 8 is a block diagram showing a configuration of the third embodiment of the present invention.

In the third embodiment, a plurality of cameras are additionally installed on the terminal side. If the existing surveillance camera 1 alone cannot cover the video near the intersection, an additional terminal device 42 is installed as shown in FIG. Extension terminal equipment 42
The camera 1, the summing unit 4, the superimposition unit 5, the sound compression section 6, a microphone 7, determination unit 9, and an endless recording reproducing unit 1 0. The non-video information character generator 3 is shared. Ma
In addition, 12 is a video selection switch, 41 is a terminal device control unit,
43 is a control transmission switching unit, 41g is a transmission switching signal, 12a
Is the superimposed video signal 10 selected by the video selection switch 12
a, 10c, and 43a are transmission paths.

The discriminator 9 outputs a trigger signal 9a or 9b when detecting an accident or the like. After recording the superimposed video signal 5a or 5c as shown in FIG. 5, the endless recording / reproducing section 10 which has received the trigger signal 9a or 9b automatically enters the endless reproducing state.

Further, the terminal device control section 41 controls the control transmission switching section 43 by the transmission switching signal 41g to switch the superimposed video signal 17a of the terminal-side device 17 to the superimposed video signal 12a and, at the same time, to switch the video selection signal 41b. Controls the video selection switch 12 so that the superimposed video signal 10a or 10c of the endless recording / reproducing unit 10 in the endless reproducing state is sequentially transmitted via the transmission line 43a to the center-side device 1.
8

After the endless recording / reproducing unit 10 repeats the endless reproduction several times, the terminal device control unit 41 outputs the recording restart command signals 41a and 41f to set the endless recording / reproducing unit 10 to the recording re-state and to transmit. Switching signal 4
The control transmission switching unit 43 is controlled by 1g to switch 12a to the superimposed video signal 17a of the terminal-side device 17.

[0064]

As described above, the traffic monitoring device according to the first aspect of the present invention displays the image near the intersection on the terminal side.
A camera that captures an image and outputs a video signal,
Signal status information and time detected from the installed traffic light, and
A video that creates and outputs a character video signal containing location information
Out-of-image information character generator and video output from the camera
Signal and character image output from the non-image information character generator
An addition unit that adds the image signal and outputs an added video signal;
A microphone that observes the sound near the intersection and outputs a sound signal;
Time-compressing the sound signal output from the microphone
A sound compressor that outputs a signal, and a signal output from the microphone.
For bandpass filter for sound signal level and accident sound detection
Trigger signal indicating the occurrence of an accident by determining the occurrence of a traffic accident
Discriminator for outputting a signal, and addition output from the adder
A video signal, a compressed sound signal output from the sound compression unit, and
And the trigger signal output from the discriminator
A superimposition section that outputs a superimposed video signal to the transmission path.
The weight transmitted from the video transmission path to the
The compressed sound signal is separated from the tatami mat video signal
A sound expansion unit that outputs a long sound signal, and the video transmission path
The toe superimposed on the transmitted superimposed video signal.
Detector that outputs a recording stop signal when a trigger signal is detected
And the superimposed video signal transmitted by the video transmission path.
Signal and the expanded sound signal separated by the sound expansion unit
Is continuously recorded endlessly in the memory,
When the recording stop signal is input from the first predetermined time
When recording is stopped later and the recording stop signal is input
Endless for the second predetermined time before and after
The playback state is reached, and the reproduced superimposed video signal and expanded audio signal are
Output signal and a recording stop signal.
Recording and playback unit, and the endless recording and playback unit
Recognize that an accident has occurred by inputting a recording stop signal
And a system control unit that outputs a recording command signal
Output from the endless recording / reproducing unit based on the image command signal.
Superimposed video signal and expanded sound for the second predetermined time
Since a storage unit for recording signals, requires signal transmission path of the video signal and the sound signal in one, Ri can der easily inserted installed in the system, such as the existing control center, also recorded
The media (eg, videotape) includes things at various intersections
Since only the image before and after the late like occur are recorded, the intersection
Without having to search through multiple videotapes per
There is an effect that the search time can be reduced because the number of unnecessary images is small .

Further, as described above, the traffic monitoring device according to the second aspect of the present invention has a terminal side near an intersection.
A camera that shoots an image of the image and outputs a video signal;
Signal status information and time detected from the traffic light installed at the point
Create and output a character video signal containing
A non-video information character generation unit,
Video signal and text output from the non-video information character generator
Adder that adds the character image signal and outputs the added image signal
And a microphone that observes the sound near the intersection and outputs a sound signal
And time-compress the sound signal output from the microphone
A sound compression unit that outputs a compressed sound signal;
Added video signal and the pressure output from the sound compression unit.
Outputs superimposed video signal to video transmission line by superimposing compressed sound signal
A superimposing section, and the center side is provided with the video transmission path.
From the superimposed video signal sent from the
Sound expansion unit that separates and expands the time and outputs an expanded sound signal
And the level of the expanded sound signal output from the sound expander
A traffic accident is generated by a band-pass filter for detecting accident sounds.
Outputs a recording stop signal indicating occurrence of an accident when discrimination is made
A discriminator and the superimposition sent by the video transmission path
The video signal and the expanded sound separated by the sound expansion unit
The signal is continuously recorded endlessly in the memory at all times.
When the recording stop signal is input from another unit, the first predetermined
After a time, the recording was stopped, and the recording stop signal was input.
End for the second predetermined time before and after the time point
Playback mode, the reproduced superimposed video signal and decompression
Outputs a sound signal and outputs a recording stop signal.
A dress recording / reproducing section, and an endless recording / reproducing section.
It is recognized that an accident has occurred due to the input of the recording stop signal.
A system control unit that outputs a recording command signal when
Output from the endless recording / reproducing unit based on the recording image command signal
And the superimposed video signal for the second predetermined time
Since a storage unit for recording prolonged sound signal, a video signal
Only one signal transmission path for sound signals is required, and the existing control center
Etc. can be easily inserted and installed.
Since only images before and after the occurrence of an accident at various intersections are recorded on a recording medium (for example, a video tape), it is not necessary to search a large number of video tapes at each intersection,
Further, there is an effect that the search time can be shortened because there are few unnecessary images.

Further, as described above, the traffic monitoring device according to claim 3 of the present invention provides the terminal side with the
A second method of capturing an image near the difference point and outputting a second image signal
Camera and a second image output from the second camera.
Image signal and characters output from the non-video information character generator
And adding a video signal and outputting a second added video signal.
2 and the second sound by observing the sound near the intersection
A second microphone that outputs a signal, and a second microphone that outputs the signal.
Time-compressing the output second sound signal to produce a second compressed sound signal
A second sound compression unit for outputting a signal, and the second microphone
The level of the output second sound signal and the accident sound detection bump
Use a debus filter to determine the occurrence of a traffic accident and
A second determination unit that outputs a second trigger signal indicating raw,
A second addition video signal output from the second addition unit,
A second compressed sound signal output from the second sound compression unit,
And a second trigger signal output from the second determination unit
Superimposing unit that superimposes and outputs a second superimposed video signal
And a second superimposed video signal output from the second superimposing unit.
Signal is continuously recorded endlessly in the memory at all times.
When the second trigger signal is input from the determination unit of
Stop the recording after a predetermined time of the second trigger signal
A second predetermined time before and after the time when the is input
The endless playback state, and the second playback
A second endless recording / reproducing unit for outputting a tatami mat video signal;
Receiving the second trigger signal from the second determination unit;
And a terminal device control unit for outputting a transmission switching signal.
When the transmission switching signal is input from the device controller,
The superimposed video signal output from the superimposing unit is transmitted to the second
To the second superimposed video signal output from the dress recording / reproducing unit.
A control transmission switching unit for switching and outputting to the video transmission path.
Furthermore , the signal transmission path for the video signal and the audio signal is 1
It only requires a book, and it can be easily used in existing systems such as traffic control centers.
It can be inserted and installed, and also has a recording medium (for example, video
On tape) before and after accidents at various intersections
Numerous videos per intersection because only recorded
There is no need to search for tapes and there are few unnecessary images
Therefore, there is an effect that the search time can be reduced .

Further, as described above, the traffic monitoring device according to a fourth aspect of the present invention includes a
Number of monitors and the plurality of monitors by a display switching signal.
A display changeover switch for changing over the display,
The system control unit detects an accident at an intersection due to the recording stop signal.
When it recognizes that it is generated, it outputs the display switching signal and
Select one of the monitors not currently displayed and
Superimposed video of the endless recording / playback unit that outputs the recording stop signal
Display and output the signal and the expanded sound signal to the selected monitor.
Since that, the situation of a large number of the intersection, the search in the eyes of all times operator
The intersection where the accident occurred can be recognized without
It has the effect of

Further, as described above, the traffic monitoring device according to claim 5 of the present invention has
A recording medium remaining amount warning signal is issued when the amount notification signal is input.
A recording medium remaining amount warning generation unit;
The control unit may control the recording medium at any time according to the number of recordings of the storage unit.
Monitor the remaining amount, and the remaining amount falls below the preset amount
And outputs the remaining amount notification signal, so that the recording medium (eg,
For example, there is an effect that the recording error can be prevented by the warning of the remaining amount of the video tape) .

[0069]

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an overall configuration of a first embodiment of the present invention.

FIG. 2 is a block diagram illustrating a configuration of a superimposition unit and a sound compression unit according to the first embodiment of the present invention.

FIG. 3 is a block diagram illustrating a configuration of a sound expansion unit according to the first embodiment of the present invention.

FIG. 4 is a diagram illustrating an output signal of a superposition unit according to the first embodiment of the present invention.

FIG. 5 is a diagram illustrating a recording method before and after the occurrence of an automatic accident or the like according to the first embodiment of the present invention.

FIG. 6 is a diagram illustrating an overall configuration of a second embodiment of the present invention.

FIG. 7 is a diagram illustrating an output signal of a superposition unit according to the second embodiment of the present invention.

FIG. 8 is a diagram illustrating a configuration of a third exemplary embodiment of the present invention.

FIG. 9 is a diagram showing a configuration of a conventional traffic accident situation recording device.

FIG. 10 is a diagram showing a configuration of a conventional monitoring system of a traffic control center or the like.

[Explanation of symbols]

1 camera, 2 traffic light, 3 non-video information character generator,
4 addition section, 5 superposition section, 6 sound compression section, 7 microphone,
8 sound decompression unit, 9 discrimination unit, 10 endless recording / reproduction unit, 11 system control unit, 12 video selection switch,
13 storage unit, 14 display changeover switch, 15 monitor, 16 tape remaining amount warning generation unit, 17, 19 terminal side device, 18, 20 center side device, 40 detection unit.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-338900 (JP, A) JP-A-6-266992 (JP, A) JP-A-5-250595 (JP, A) JP-A-4- 310200 (JP, A) JP-A-3-344421 (JP, A) JP-A-6-6775 (JP, A) JP-A-6-38212 (JP, A) JP-A-6-19779 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) G08G 1/00-1/16

Claims (5)

(57) [Claims] 1. A camera for photographing an image near an intersection and outputting a video signal on a terminal side.
And signal status information detected from a traffic light installed at the intersection.
A video signal containing information and time and location information.
A non-video information character generating unit for outputting the video signal output from the camera and the non-video information text
Addition by adding the character video signal output from the character generator
An addition unit that outputs a video signal, a microphone that observes sound near the intersection and outputs a sound signal, and a time-compressed sound signal output from the microphone to generate a compressed sound.
A sound compressor that outputs a signal, and a level of a sound signal output from the microphone and detection of an accident sound.
Traffic accidents are identified by a band pass filter for
A determination unit that outputs a trigger signal indicating that an accident has occurred, an addition video signal output from the addition unit, and the sound compression unit.
The compressed sound signal output from the
Superimposed video signal on the video transmission path
And a superimposing unit for outputting the superimposed video signal transmitted by the video transmission path on the center side .
From the compressed sound signal and time-expanded to produce an expanded sound signal.
And a superimposed video signal transmitted by the video transmission path.
When the superimposed trigger signal is detected, a recording stop signal is issued.
A detection unit that outputs a signal, and the superimposed video signal transmitted through the video transmission path.
And the expanded sound signal separated by the sound expanding unit.
At the time, the endless recording continues in the memory
When a recording stop signal is input, recording is performed after a first predetermined time.
Stop recording, and refer to the point in time when the recording stop signal is input.
Endless playback status for the second predetermined time before and after
To output the reproduced superimposed video signal and expanded sound signal.
Endless recording that outputs a recording stop signal at the same time
A reproduction unit and an input of the recording stop signal from the endless recording / reproduction unit.
Recording instruction signal when it recognizes that an accident has occurred by force
From the endless recording / reproducing unit based on the recording command signal.
The outputted superimposed video signal for the second predetermined time;
A traffic monitoring device comprising: a storage unit for recording an extended sound signal . 2. A camera for photographing an image near an intersection and outputting a video signal on a terminal side.
And signal status information detected from a traffic light installed at the intersection.
A video signal containing information and time and location information.
A non-video information character generating unit for outputting the video signal output from the camera and the non-video information text
Addition by adding the character video signal output from the character generator
An addition unit that outputs a video signal, a microphone that observes sound near the intersection and outputs a sound signal, and a time-compressed sound signal output from the microphone to generate a compressed sound.
A sound compression unit that outputs a signal, an addition video signal output from the addition unit, and the sound pressure
Superimposes the compressed sound signal output from the compression unit to the video transmission path
A superimposing section for outputting a superimposed video signal , and the center side includes the superimposed video signal transmitted by the video transmission path.
From the compressed sound signal and time-expanded to produce an expanded sound signal.
Sound expanding section, the level of the expanded sound signal output from the sound expanding section and the accident
Use a bandpass filter for sound detection to prevent traffic accidents
When discrimination is made, a recording stop signal indicating that an accident has occurred is output.
And the superimposed video signal transmitted by the video transmission path.
And the expanded sound signal separated by the sound expanding unit.
At the time, the endless recording continues in the memory
When a recording stop signal is input, recording is performed after a first predetermined time.
Stop recording, and refer to the point in time when the recording stop signal is input.
Endless playback status for the second predetermined time before and after
To output the reproduced superimposed video signal and expanded sound signal.
Endless recording that outputs a recording stop signal at the same time
A reproduction unit and an input of the recording stop signal from the endless recording / reproduction unit.
Recording instruction signal when it recognizes that an accident has occurred by force
From the endless recording / reproducing unit based on the recording command signal.
The outputted superimposed video signal for the second predetermined time;
A storage section for recording an extended sound signal .
That traffic monitoring equipment. 3. The terminal captures an image near the intersection and outputs a second image signal.
A second camera, and a second camera output from the second camera.
2 is added to the character image signal output from the non-image information character generation unit to form a second added image.
A second adder for outputting an image signal, and observing sound near the intersection to output a second sound signal
A second microphone, and a second sound signal output from the second microphone,
A second sound compression unit for compressing and outputting a second compressed sound signal, and a level of the second sound signal output from the second microphone
Traffic accidents with a band-pass filter
Judgment of occurrence and output of second trigger signal indicating occurrence of accident
A second discriminating unit that performs the operation, a second added video signal output from the second adding unit,
A second compressed sound signal output from the second sound compression unit,
And a second trigger signal output from the second determination unit
Superimposing unit that superimposes and outputs a second superimposed video signal
And a second superimposed video signal output from the second superimposing unit
Is continuously recorded endlessly in a memory, and the second
When the second trigger signal is input from the determination unit, the first
The recording is stopped after a predetermined time, and the second trigger signal
Second predetermined time before and after the input time
Only the endless playback state, and the played second superimposition
A second endless recording / reproducing unit that outputs a video signal; and the second trigger signal is input from the second determining unit.
Then, a terminal device control unit that outputs a transmission switching signal, and the transmission switching signal is input from the terminal device control unit.
The superimposed video signal output from the superimposing unit to the second
Superimposed video output from the endless recording / playback unit of
Control transmission switching to switch to signal and output to the video transmission path
Traffic monitoring device according to claim 1, further comprising a part. 4. The center side has a plurality of monitors and a display switchover device for switching the plurality of monitors by a display switching signal.
Further comprising a changeover switch , wherein the system control unit controls the intersection at the intersection by the recording stop signal.
When it is recognized that an accident has occurred, the display switching signal
Output and select any monitor not currently displayed
And an endless recording / reproducing unit that outputs the recording stop signal.
The superimposed video signal and expanded sound signal of the
The traffic monitoring device according to claim 1 , wherein the traffic monitoring device outputs a display . 5. A recording medium remaining amount warning signal is issued to the center when a remaining amount notification signal is input.
Further comprising a recording medium remaining amount warning generating unit , wherein the system control unit may, if necessary, count the number of recordings of the storage unit.
The remaining amount of the recording medium is monitored, and the remaining amount is set in advance.
And becomes an amount below, traffic monitoring system according to claim 1, 2 or 3, wherein the outputting the remaining amount notification signal.