JPH01126569A - Trouble discriminator - Google Patents

Abstract

PURPOSE:To facilitate the discrimination of troubles of elements of a video apparatus, by selectively separating a synchronous signal on the output side of an image pickup means and on the input side of an image receiving means to detect the presence of continuity of the synchronous signal. CONSTITUTION:A selective separation means 11 fetches video signals separately on the output side of an image pickup means 2 and the input side of an image receiving means 4 through a changeover switch 13 and sends them selectively with a switching. A video signal being fed from the switch 13 is sent out with a synchronous signal separated by a synchronous separation circuit 14. A discrimination means 12 takes the synchronous signal from the circuit 14 into a switching circuit 15 and a switching signal is sent out synchronizing the synchronous signal to be counted with a counting circuit 16. Moreover, a CPU 17 detects a coefficient state of the circuit 16 to discriminate the presence of continuity of the switching signal, namely, the synchronous signal. When the absence of the continuity is determined, an alarm signal is sent to an alarm generating section 9.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a failure determination device, more specifically, a failure determination device for determining the presence or absence of a failure in video equipment in a surveillance system such as a security system. Regarding.

(Prior Art) Generally, video equipment used in security monitoring systems includes a TV camera that obtains an image signal of an object, and a TV camera that obtains an image signal of an object.
A receiver installed at a location away from the camera, and the TV.
It is equipped with a transmission system using a signal cable that connects the camera and receiver.

By the way, if a failure occurs in one of the components of such video equipment, such as the receiver, and the image is not displayed, if you try to find the cause, you will find out whether there is a disconnection in the transmission system or whether the image is not being received properly. In order to determine whether the TV camera or TV camera itself is malfunctioning, it is necessary to sequentially inspect the entire system from the TV camera to the receiver.

That is, conventionally, there is a problem in that it is not possible to immediately determine which part of the video equipment, the TV camera, the transmission system, or the 3j'RIPa, is malfunctioning.

(Problems to be Solved by the Invention) As described above, in the prior art, there is a problem in that determining the failure of each element of video equipment is extremely complicated.

SUMMARY OF THE INVENTION Therefore, it is an object of the present invention to provide a failure determination device that can easily determine failures in each element of video equipment.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides an imaging means that superimposes a synchronization signal on an imaging signal obtained from an object and sends it out, and a transmission system that transmits the imaging signal and the synchronization signal. and an image receiving means for acquiring an image of an object by capturing an imaging signal and a synchronization signal sent by the transmission system, the failure determination device being used in an imaging device, the output side of the imaging means and the image receiving means selective separation means for selectively separating the synchronization signal from the input side of the apparatus; and detecting the presence or absence of continuity of the synchronization signal based on the output of the selection separation means, and detecting the presence or absence of a failure in the imaging means, transmission system, and image receiving means. and discriminating means for discriminating.

(for production) The operation of the failure determination device having the above configuration will be explained below.

The selective separation means of this device selectively separates the synchronization signal from the output side of the image pickup means and the input side of the image reception means among the imaging signal and synchronization signal transmitted from the image pickup means to the image reception means via the transmission system. and sends it to the discriminating means.

The determining means detects the presence or absence of continuity of the synchronizing signal separated from the output side of the imaging means or the input side of the image receiving means, and if there is no continuity of the synchronizing signal from the output side of the imaging means, it is determined that the imaging means is malfunctioning. It is determined that Further, if there is continuity of the synchronization signal from the output side of the image pickup means, but there is no continuity of the synchronization signal from the input side of the image reception means, it is determined that there is a failure in the transmission system.

Roughly speaking, if there is continuity of the synchronization signal from the input side of the image receiving means, it is determined that there is a failure in the image receiving means itself.

(Example) The present invention will be explained in detail below.

FIG. 1 shows a failure determination device 1 and an imaging means 2. This shows a state in which it is connected to an imaging device 4 consisting of a transmission system 3 using a signal cable and an image receiving means 4.

The imaging means 2 is arranged, for example, at a position where an object is imaged in a monitoring system, and the image receiving means 4 is arranged, for example, in a monitoring room 5 separated from the imaging means 2. As shown in FIG. 3, the imaging means 2 includes a television camera body 6 for obtaining an image signal of an object, and a television camera body 6.
The television camera power supply section 7 supplies power to the television camera.

The image receiving means 4 is constituted by a television receiver, and is adapted to take in an image signal in which the imaging signal S and synchronization signal SO shown in FIG. It has become.

The failure determination device 1 selectively takes in the above-mentioned video signal from the output side of the image pickup means 2 and the input side of the image reception means 4, separates a synchronization signal from this video signal, and separates the synchronization signal from the image signal. A failure determination means 8 that determines a failure in the transmission system 3 and the image receiving means 4; an alarm generating section 9 such as a buzzer that issues an alarm based on the determination result of the failure determination means 8; The monitoring room 5 is equipped with a camera power operation unit 10 that controls power supply on and off to the monitoring room 5.
located within.

The failure determination means 8 includes a selection and separation means 11 and a determination means 12, as shown in FIG.

The selection/separation means 11 includes a changeover switch 13 that takes in video signals q from the output side of the image pickup means 2 and the input side of the image reception means 4, switches and selects them, and sends them out, and a changeover switch 13 that receives the video signals q from the output side of the image pickup means 2 and the input side of the image reception means 4, respectively, and selects and sends out the video signals q. Take in the signal and the 5th
As shown in Figure (a), the synchronization separation circuit 14 separates and sends out the synchronization signal So.

The discrimination means 12 takes in the synchronization signal So from the synchronization separation circuit 14, performs switching processing on it, and produces a switching signal S shown in FIG. 5(b) that is at TTL level and synchronized with the synchronization signal So. The switching circuit 15 that sends out the switching signal, the counting circuit 16 that counts this switching signal, and the counting state of the counting circuit 16 is detected to determine whether there is continuity of the switching signal S1, that is, the synchronization signal SO, and to determine whether there is continuity. It is equipped with a CPL 117 that sends an alarm signal to the alarm generating section 9 when it is determined that this is the case.

The camera power operation section 10 drives a relay contact 19 provided on a power cable 18 drawn out between the television camera power supply section 7 and the television camera body 6, as shown in FIG. excitation coil 20
and a power supply VCC connected to the excitation coil 20 via a switch 22, and the relay contact 19 is closed by turning on the switch 22 and energizing the excitation coil 20, thereby, Power is supplied from the television camera power supply section 7 to the television camera body 6.

Next, the operation of the above-mentioned device will be explained.

First, as an initial state, the switch 22 of the camera power operation section 10 is on, and the excitation coil 20 is excited.
It is assumed that the relay contact 19 is closed so that power is supplied from the television camera power supply section 7 to the television camera body 6.

When the television camera body 6 captures an image of the object in this state, the television camera body 6 sends to the transmission system 3 a video signal in which the imaging signal S is superimposed on the synchronization signal So shown in FIG.

At this time, if the changeover switch 13 of the selection separation means 11 is turned on to the output side of the imaging means 2, the video signal transmitted through the transmission system 3 is also input to the synchronization separation circuit 14 via the changeover switch 13.

The synchronization separation circuit 14 takes in the video signal, separates only the synchronization signal So from the video signal as shown in FIG. 5(a), and sends it out to the switching circuit 15. The switching circuit 15 takes in the synchronization signal So, performs switching processing on it, generates a switching signal S1 at the TTL level and synchronized with the synchronization signal So, and sends it to the counting circuit 16.

The counting circuit 16 counts the switching signals @S1.

The CPtJ17 detects the counting state of the switching signal S1 in the counting circuit 17 and determines whether or not there is continuity.

Then, when the CPU 17 determines that the continuity of the counting state of the switching signal S1 has been interrupted, it sends an alarm signal to the alarm generator 9 indicating a failure of the television camera body 6 of the imaging means 2. The alarm generation unit 9 that receives this alarm signal issues an alarm such as a buzzer sound. This makes it possible to know that the imaging means 2 is out of order.

Moreover, once the CPU 17 described above determines that the switching signal S1 is continuous, it does not send out an alarm signal, and thereby it can be known that the imaging means 2 is normal.

Next, the changeover switch 13 is switched to the input side of the image receiving means 13. At this time, the video signal that has passed through the transmission system 3 is input to the synchronization separation circuit 14 via the changeover switch 13. Thereafter, the synchronization separation circuit 14 operates in the same manner as described above. The switching circuit 15° counting circuit 16 and CPU 17 operate, and when the CPU 17 determines that there is no continuity of the switching signal S1, an alarm signal is sent to the alarm generator 9, and the alarm generator 9 issues an alarm. . If an alarm is issued while the imaging means 2 is normal and the changeover switch 13 is turned on to the input side of the image receiving means 4, it is possible to know that the transmission system 3 has a failure such as a disconnection or continuity failure. can.

On the other hand, when the CPU 17 determines that the switching signal S1 is continuous, no alarm is issued, and thereby it can be known that the transmission system 3 is normal.

If, for example, the image receiving means 4 does not display an image of an object normally even though both the imaging means 2 and the transmission system 3 are normal, it is possible to determine that the image receiving means 4 itself is malfunctioning. can.

The present invention is not limited to the embodiments described above, and various modifications can be made within the scope of the invention.

[Effects of the Invention] According to the present invention described in detail above, it is possible to easily determine failures in each element of video equipment consisting of an imaging means, a transmission system, and an image receiving means without adding a simple circuit. It is possible to provide a failure determination device that can perform ζ.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a video device incorporating the embodiment device of the present invention, FIG. 2 is a block diagram showing a failure determination means provided in the embodiment device, and FIG. 3 is a camera power supply in the embodiment device. A circuit diagram showing the connection state between the operation unit and the TA imager, FIG. 4 is a waveform diagram of a video signal, FIG. 5(a) is a waveform diagram of a synchronizing signal, and FIG. 5(b) is a waveform diagram of a switching signal. It is. DESCRIPTION OF SYMBOLS 1... Failure determination device, 2... Imaging means, 3... Transmission system, 4... Image receiving means, 11... Selection separation means, 1
2...Discrimination means. (G) Fifth cause

Claims (1)

[Claims] An imaging means that superimposes a synchronization signal on the imaging signal obtained from the target object and sends it out; a transmission system that transmits the imaging signal and the synchronization signal; A failure determination device used in an imaging device having an image receiving means for obtaining an image of an object, the selective separating means selectively separating the synchronization signal from the output side of the image capturing means and the input side of the image receiving means; A failure determining device comprising: a determining means for detecting continuity of a synchronizing signal based on the output of the selective separating means and determining whether there is a failure in the imaging means, the transmission system, and the image receiving means.