JPH1164046A - Device for recording and reproducing signals - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device for recording and reproducing signals by which electrical signals as cause can be recorded at a high speed, when the cause of faulty operation of machinary equipment is analysed and analysis be conducted effectively. SOLUTION: A synchronous separating part 2 extracts both synchronous signal and video signal from a television signal. A video signal storage part 4 stores a video signal for each one picture by the synchronous signal. An S/H part 6 is synchronized with a synchronous signal generating part 8, so as to sample an electric signal outputted from a sensor 5. An electrical signal storage part 9 allows to stare the picture number and electrical signal generated by the synchronous signal, which is inputted from the synchronous separating part 2 at one address, in correspondence with each other. On the other hand, the respective data stored in the video signal storage part 4 and electrical signal storage part 9 are synchronized with an indication synchronous signal outputted from an indication synchronous signal generating part 10, and are read out simultaneously. An indication control part 11 is synchronized with the indication synchronous signal and indicates on the same picture a video formed of video signal data and a measuring value formed of electrical signal data.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal recording / reproducing apparatus for recording and reproducing a video signal and a measurement signal in analyzing the operation of mechanical equipment.

[0002]

2. Description of the Related Art In general, when a malfunction of the mechanical equipment occurs at the time of development of a mechanical equipment for factory automation (FA) or at the time of delivery to a customer, in the conventional case, an operator needs to attach various measuring instruments to the mechanical equipment. After attaching to the equipment, operate the mechanical equipment again, wait for the failure to occur near it, and when the failure occurs again, record the various measured values at the time of the failure using the attached measuring equipment However, the cause of the failure was analyzed based on the measured values. However, according to the conventional analysis method described above, the operator visually checks the operation of the machinery and equipment, and when a failure occurs, the measurement value is recorded at that timing, whereas the failure occurs at any timing. Since it is impossible to predict whether the measurement will be performed, there is a problem that the measurement timing is easily missed. Therefore, using a signal recording / reproducing apparatus as disclosed in Japanese Patent Application No. 08-346249, the cause of the failure was analyzed based on the video of the operation and the display of various measured values when the failure occurred.

[0003]

However, in the above-described conventional apparatus, signal recording involves sampling an electric signal in synchronization with a horizontal synchronizing signal or the like superimposed on a television signal. When the change of the electric signal becomes faster (than the period of the horizontal synchronizing signal), there is a problem that the signal that is the true cause cannot be recorded and reproduced.

In general, the change time of the electric signal is expressed as a well-chosen decimal number as one unit, but the horizontal synchronizing signal is a signal used in an actual television signal. Therefore, in one cycle, a well-cut decimal number is not necessarily set as one cycle, and as one example, one cycle is set to 63.5 μs or the like. Therefore, when recording the electric signal in synchronization with the horizontal synchronization signal and displaying the recorded electric signal, the recorded electric signal is displayed in units of one cycle of the horizontal synchronization signal. Will be. Therefore, in the above-described conventional device, it is not easy to temporally recognize the recorded electric signal at the time of display,
It was difficult to directly read the change time interval of the electric signal.

An object of the present invention is to provide a signal recording / reproducing apparatus which solves such a problem and which contributes to the efficiency of the analysis work when analyzing a defect.

[0006]

According to the first aspect of the present invention,
A photographing unit that outputs a video signal corresponding to a photographed image; a measuring unit that measures a predetermined measurement target and outputs an electric signal corresponding to the measured value; a video signal output by the photographing unit; Storage means for storing the electrical signals output by the means in association with each other; reading means for reading out the video signal and the electrical signal stored in the storage means in association with each other; Display means for simultaneously displaying an image based on a signal and a measured value based on an electric signal. The invention according to claim 2 is a photographing means for outputting a television signal corresponding to a photographed video, a video signal for an arbitrary scanning period from a television signal output by the photographing means, and a synchronous position for the scanning period. Separation means for extracting a synchronization signal indicating, measurement means for measuring a predetermined measurement target, and outputting an electric signal corresponding to the measurement value, and synchronization signal generation means for generating a sampling synchronization signal of a predetermined cycle, A sampling unit for sampling the electric signal output from the measurement unit in synchronization with a sampling synchronization signal generated by the synchronization signal generation unit; a video storage unit for storing a video signal extracted by the separation unit; Signal storage means for storing data indicating a signal scanning period and sampled electric signals in association with each other, and a table for generating a display synchronization signal of a predetermined cycle A synchronizing signal generating unit, a video reading unit that reads a video signal stored in the video storage unit in synchronization with the display synchronizing signal generated by the display synchronizing signal generating unit, and a display synchronizing signal generating unit that generates the synchronizing signal. In synchronization with a display synchronization signal, a signal reading means for reading data and an electric signal stored in association with the signal storage means, and in synchronization with a display synchronization signal generated by the display synchronization signal generation means, A display corresponding to the measured value based on the electric signal read by the signal reading unit and the video corresponding to the data read by the signal reading unit and simultaneously displaying the video based on the video signal read from the video storage unit; Means. The invention according to claim 3 is
3. The signal recording / reproducing apparatus according to claim 1, wherein at the time of recording the video signal and the electric signal, a trigger signal generating unit that outputs a trigger signal when a predetermined condition is satisfied, Storage means for storing the video signal and the electric signal written during a predetermined period immediately before and immediately after the output of the trigger signal among the video signal and the electric signal. According to a fourth aspect of the present invention, in the signal recording / reproducing apparatus according to the third aspect, the trigger signal generating means outputs a trigger signal when a set time has elapsed.
According to a fifth aspect of the present invention, in the signal recording / reproducing apparatus according to the third aspect, the trigger signal generating means outputs a trigger signal when an image changes on a shooting screen of the shooting means. . The invention according to claim 6 is
4. The signal recording / reproducing apparatus according to claim 3, wherein the trigger signal generating means outputs a trigger signal when an image changes within a predetermined area set on a photographing screen of the photographing means. The invention according to claim 7 is
7. The signal recording / reproducing apparatus according to claim 6, wherein the number, position, and size of the predetermined area on the shooting screen are set to arbitrary values. According to an eighth aspect of the present invention, in the signal recording / reproducing apparatus according to any one of the third to seventh aspects, the trigger signal generating means detects a predetermined color on a shooting screen of the shooting means, and It is characterized by outputting a signal. Claim 9
According to a third aspect of the present invention, in the signal recording / reproducing apparatus according to any one of the third to eighth aspects, the trigger signal generation unit generates a trigger signal when an electric signal output from the measurement unit satisfies a predetermined condition. It is characterized by outputting. According to a tenth aspect of the present invention, in the signal recording / reproducing apparatus according to any one of the third to ninth aspects, when a trigger signal is output, the signal recording / reproducing apparatus is automatically connected to a remote monitoring center via a communication line. The signal recorded in the signal recording / reproducing apparatus is transferred to a remote place.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION

§1. First Embodiment Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration example of the signal recording / reproducing apparatus according to the first embodiment of the present invention. In FIG. 1, a camera 1 is, specifically, a color CCD camera, which shoots a shooting target and outputs a television signal corresponding to the video. The synchronization separation unit 2 separates and extracts a video signal in an arbitrary scanning period and a synchronization signal indicating a synchronization position in the scanning period from the television signal. The video signal A / D converter 3 converts a video signal (analog signal) into video signal data (digital signal) at a preset sampling period and outputs it during one scanning period. More specifically, it comprises a commercially available A / D converter for video signal processing, and A / D converts an input video signal in synchronization with a sampling clock. The video signal storage unit 4 includes an IC memory (such as a DRAM) and its peripheral circuits. FIG. 2 is an explanatory diagram illustrating a configuration example of the video signal storage unit 4. As shown in this figure, the video signal storage unit 4 stores the video signal data in units of data for one screen. The video signal storage unit 4 stores the synchronization signal (input from the synchronization separation unit 2) or the display synchronization signal generation unit 10
An address counter (not shown) for generating a write / read address for the video signal storage unit 4 based on a display synchronization signal (input from the controller) is built in.

The sensor 5 is, for example, a temperature sensor using a thermocouple, and outputs an electric signal having a voltage value proportional to a measured temperature. In the present embodiment, the temperature is measured as an example of the measurement target, but the present invention is applicable to any measurement target as long as the measurement target can be converted into an electric signal. is there. In the following, examples of measurement objects applicable to the present invention are listed as humidity, odor, vibration,
Voltage, current, wind speed, sound, air pressure, air pressure, rainfall, resistance, inductance, capacitance, frequency, noise, instantaneous interruption, water pressure,
Oil pressure, blood pressure, electrocardiogram, electroencephalogram, power outage, light, color, concentration, hydrogen ion concentration (PH), water volume, chemical oxygen demand (CO
D), biological oxygen demand (BOD), sound pressure, pressure, stress, rotational speed, strain, wear, amplitude, velocity, expansion, contraction,
Shock, smoke, fire, opening and closing, displacement, and the like.

Further, if the measuring instrument outputs an electric signal corresponding to the output of the sensor 5, it can be connected in place of the sensor 5 to obtain the same effect.

The sample and hold section (S / H)
When the hold signal generated by the synchronization signal generator 8 is input, the unit 6 samples and holds the input electric signal. The synchronizing signal generator 8 generates a signal having a well-cut frequency in decimal units, and generates a hold signal for the S / H unit 6 and an enable signal for the electric signal A / D converter 7. Note that the generated frequency can be changed within a range of a decimal integer value. Electric signal A / D
The conversion unit 7 is, specifically, a commercially available A / D converter IC
When an enable signal generated by the synchronization signal generator 8 is input, the input electric signal is A / D converted. The electric signal storage unit 9 includes an IC memory (such as a DRAM) and its peripheral circuits. FIG. 3 is an explanatory diagram illustrating a configuration example of the electric signal storage unit 9. As shown in this figure, in the electric signal storage unit 9, at one address,
The screen number generated from the synchronization signal input from the synchronization separation unit 2 and the electrical signal data from the sensor 5 are stored in association with each other. Further, the electric signal storage unit 9 stores the synchronization signal based on the synchronization signal (input from the synchronization signal generation unit 8) or the display synchronization signal (input from the display synchronization signal generation unit 10).
An address counter (not shown) for generating a write / read address for the electric signal storage unit 9 is built in. The display synchronization signal generator 10 generates and outputs a display synchronization signal having a predetermined period. When the synchronization signal and the video signal are input, the display controller 11 controls the display of the monitor TV 12 based on these signals.

Next, the operation of the signal recording / reproducing apparatus having the above configuration will be described. (1) Recording Operation First, the recording operation of the video signal and the electric signal (corresponding to the measured value) by the present apparatus will be described. When an operator turns on the power of the apparatus and inputs a recording start instruction, the camera 1 shoots an object to be shot and outputs a television signal corresponding to the video. The synchronization separation unit 2 extracts a video signal from a television signal output by the camera 1 and also extracts a synchronization signal indicating a synchronization position in a scanning period corresponding to the video signal. The video signal A / D conversion unit 3
The video signal (analog signal) extracted by the synchronization separation unit 2 is converted into video signal data (digital signal) in synchronization with the synchronization signal extracted by the synchronization separation unit 2. The address counter built in the video signal storage unit 4 is
Counts the extracted synchronization signals, and generates a write address of the video signal storage unit 4 based on the count value. Then, the video signal data output from the video signal A / D conversion unit 3 is synchronized with the synchronization signal extracted by the synchronization separation unit 2,
It is stored at the address indicated by the address counter.

On the other hand, the sensor 5 measures the temperature and outputs an electric signal having a voltage value proportional to the temperature. S / H section 6
Samples the electrical signal output from the sensor 5 in synchronization with the hold signal generated by the synchronization signal generator 8.
When the enable signal generated by the synchronization signal generator 8 is input, the electric signal A / D converter 7 converts the input electric signal (analog signal) into electric signal data (digital signal).
Convert to

An address counter built in the electric signal storage unit 9 counts the signal of the synchronization signal generation unit 8 and generates a write address of the electric signal storage unit 9 based on the count value. The electric signal data output from the electric signal A / D converter 7 is stored in the address indicated by the address counter together with the screen number generated from the synchronization signal input from the synchronization separator 2.

Hereinafter, the present apparatus repeats the above operation for the television signal output from the camera 1 and the electric signal output from the sensor 5. Thus, the video signal data is sequentially stored in the video signal storage unit 4, and the screen number and the electrical signal data are sequentially stored in the electrical signal storage unit 9. At this time, when the count value (address) of each of the address counters incorporated in the video signal storage unit 4 and the electric signal storage unit 9 reaches the last address, the count value is reset to the first address. Thus, the stored video signal data and electrical signal data are updated at a cycle determined by the final address. And the worker
When a recording end instruction is input, the apparatus ends the recording operation.

(2) Reproduction Operation Next, the reproduction operation of the video signal and the electric signal by the present apparatus will be described. The operator turns on the power to the device,
When a reproduction start instruction is input, the display synchronization signal generator 10
Generates and outputs a display synchronization signal having a predetermined period. The address counter incorporated in the electric signal storage unit 9 counts the display synchronization signal output by the display synchronization signal generation unit 10,
A read address of the electric signal storage unit 9 is generated based on the count value. Then, the screen number and the electric signal data stored at the same address in the electric signal storage unit 9 are simultaneously read. The display control unit 11 synchronizes with the display synchronization signal output from the display synchronization signal generation unit 10, and measures the measured value based on the electric signal data output from the electric signal storage unit 9 and the screen output from the electric signal storage unit 9. The image based on the video signal data (in the video signal storage unit 4) corresponding to the number is simultaneously displayed on the monitor TV 12. Less than,
This device repeats the above operation. And the worker
When a display end instruction is input, the present device ends the display operation. This is the end of the description of the operation of the signal recording / reproducing apparatus having the above configuration.

§2. Second Embodiment Hereinafter, a second embodiment of the present invention will be described with reference to the drawings. FIG. 4 is a block diagram showing a configuration example of a signal recording / reproducing apparatus according to the second embodiment of the present invention. In this figure, parts corresponding to the respective parts in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted. In the signal recording / reproducing apparatus shown in this figure, a trigger generating unit 13 is newly provided. In the present embodiment, a video signal storage unit 14 is provided instead of the video signal storage unit 4 shown in FIG. 1, and an electric signal storage unit 15 is provided instead of the electric signal storage unit 9. The video signal storage unit 14 and the electric signal storage unit 15 store a new video after the storage device having the storage capacity corresponding to the recording time, the peripheral circuit, and the input of the trigger signal continue to record the remaining storage capacity. And a circuit for inhibiting writing of signal data and electric signal data. The recording time is determined by the capacity of the storage device to be mounted, but can be arbitrarily set together with the capacity after the trigger.

In FIG. 1, a trigger generation unit 13 always refers to a television signal output from the camera 1 or an electric signal output from the sensor 5, and when these signals satisfy the following setting conditions, generate a trigger signal. Output. Hereinafter, these setting conditions will be described. First, the operation modes of the trigger generation unit 13 are roughly classified into two types: an internal trigger mode and an external trigger mode. Here, there are four types of internal trigger modes: a time trigger mode, a window trigger mode, a color trigger mode, and an image change trigger mode. In the time trigger mode, the trigger generation unit 13 outputs a trigger signal when a set time elapses by referring to a timekeeping IC (not shown) built in the trigger generation unit 13.

In the window trigger mode, the trigger generator 13 outputs a trigger signal when an image changes within an arbitrary window W set on the photographing screen of the camera 1 as shown in FIG. The number of windows,
The position and size can be set to arbitrary values in a window memory (not shown) built in the trigger generation unit 13.

In the color trigger mode, the trigger generator 1
As shown in FIG. 6, when a set color (skin color in the example shown in FIG. 6) is detected on the photographing screen of the camera 1, the trigger 3 outputs a trigger signal. Thus, for example, video recording at the time of occurrence of a failure can be started using the color of a patrol light, a traffic light, a foreign substance, or the like as a trigger. In the image change trigger mode, the trigger generation unit 13 outputs a trigger signal when the shooting screen of the camera 1 changes even a little.

On the other hand, in the external trigger mode, the trigger generator 13 outputs a trigger signal when the electric signal output from the sensor 5 satisfies the set conditions. In the present embodiment, as with the measurement target of the first embodiment, any measurement target that can be converted into an electric signal can be applied as a trigger condition in the external trigger mode. In addition, the trigger generation unit 13 outputs a trigger signal when an electric signal satisfies a set condition at a set time with reference to a timing IC (not shown) built in the trigger generation unit 13.

Further, the trigger generator 13 has a built-in data memory (not shown) and stores sample data of an electric signal output from the sensor 5 in advance. Then, the trigger generation unit 13 refers to the sample data at the time of recording, compares the measured electric signal with the sample data, and outputs a trigger signal when the electric signal satisfies a predetermined condition.

Next, the operation of the signal recording / reproducing apparatus having the above configuration will be described. (1) Recording Operation As shown in FIG. 7, the recording operation of the signal recording / reproducing apparatus according to the present embodiment is as follows. It is stored in the signal storage unit 15.

Before recording, the operator sets the operation of the trigger generator 13 (the type of trigger and the trigger condition).
Thereafter, when the worker inputs a recording start instruction, the apparatus performs the same operation as the apparatus of the first embodiment, and
, And the electric signal data from the sensor 5 are sequentially recorded in the electric signal storage unit 15. On the other hand, the trigger generation unit 13 always refers to the television signal and the electric signal, and when the trigger condition set before the start of recording is satisfied, the trigger generation unit 13 sends the trigger signal to the video signal storage unit 14 and the electric signal storage unit 15. Output. Thus, after the video signal storage unit 14 and the electric signal storage unit 15 continue recording corresponding to the remaining storage capacity, the apparatus ends the recording operation. By the above operation, the trigger generation unit 13
The video signal data and the electrical signal data immediately before and after the output of the trigger signal are stored. Also, the worker
The apparatus also terminates the recording operation by inputting a recording termination instruction.

(2) Reproduction Operation The reproduction operation in this embodiment is the same as in the first embodiment. This is the end of the description of the operation of the signal recording / reproducing apparatus having the above configuration.

Although the embodiments of the present invention have been described in detail with reference to the drawings, the specific configuration is not limited to the embodiments, and changes in design and the like may be made without departing from the gist of the present invention. Even if there is, it is included in the present invention.

Next, the inclusion relationship between the means described in the claims,
The correspondence between the respective means and the present embodiment will be described. (1) Claim 1 Photographing means: Camera 1, Sync separation section 2 Measurement means: Sensor 5, S / H section 6, Synchronization signal generation section 8 Storage means: Video signal storage section 4 (input terminal, memory cell Etc.), electric signal storage unit 9 (input terminal, memory cell, etc.) reading means ... video signal storage unit 4 (sense amplifier, output terminal, etc.), electric signal storage unit 9 (sense amplifier, output terminal, etc.) display means ... ... Display control unit 11, Monitor TV 12 (2) Claim 2 Photographing means ... Camera 1 Separation means ... Synchronization separation unit 2 Measurement means ... Sensor 5 Synchronization signal generation means ... Synchronization signal generation unit 8 Sampling means ... S / H unit 6 Video storage means ... Video signal storage unit 4 (input terminal, memory cell, etc.) Signal storage means ... Electrical signal storage unit 9 (input terminal, memory cell, etc.) Display synchronization signal generation means ... Display Synchronous signal generator 10 Video readout Stage: video signal storage unit 4 (sense amplifier, output terminal, etc.) Signal readout unit: electric signal storage unit 9 (sense amplifier, output terminal, etc.) Display unit: display control unit 11, monitor TV 12 (3) Claim 3 Trigger signal generation means ... Trigger generation unit 13 Storage means ... Video signal storage unit 14 (input terminal, memory cell, etc.), electric signal storage unit 15 (input terminal, memory cell, etc.)

[0027]

FIG. 8 is a block diagram showing a specific embodiment of the signal recording / reproducing apparatus according to the present invention. In the embodiment shown in this figure, four cameras are provided to capture images of the monitoring target from different directions. The lens of each camera can be replaced with a telephoto lens, a close-up lens, or an industrial endoscope with a light source, in addition to the standard lens. FIG. 9 is an explanatory diagram illustrating an example of a screen configuration of the monitor TV according to the present embodiment. As shown in this figure, a time stamp updated in 0.001 second units is displayed on the monitor TV. The images captured by the four cameras are simultaneously displayed on the monitor TV in the four-divided area by the four-divided unit. It is also possible to select any one of these screens to display the selected screen alone or to enlarge or reduce the selected screen. Also, these images
Slow reproduction and high-speed reproduction are possible. Further, the electric signal measured by the sensor is input as an analog signal, and is displayed as a time chart synchronized with a change in the image captured by the camera on the upper right of the monitor TV.
Although not shown in FIG. 8, an image communication function is incorporated in the signal recording / reproducing apparatus shown in FIG. 8, and when a trigger signal is output, the apparatus is automatically connected to a monitoring center or the like via a communication line, and It is also conceivable to transfer signals (video signal data, electric signal data) recorded in the device to a monitoring center or the like. As a result, it is possible to monitor a fault that has occurred in a remote place.

[0028]

As described above, according to the present invention, simultaneously recorded images and measured values are displayed at the same time, so that the correspondence between the images and the measured values is easy to understand, and the efficiency of the analysis work using the images and the measured values is improved. Can be achieved. Also,
High-speed measurement is possible according to the frequency of the signal to be measured, and the efficiency of the work of analyzing the measured values can be improved.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration example of a signal recording and reproducing device according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram illustrating a configuration example of a video signal storage unit 4;

FIG. 3 is an explanatory diagram illustrating a configuration example of an electric signal storage unit 9;

FIG. 4 is a block diagram illustrating a configuration example of a signal recording / reproducing apparatus according to a second embodiment of the present invention.

FIG. 5 is an explanatory diagram of a window trigger mode according to the embodiment.

FIG. 6 is an explanatory diagram of a color trigger mode according to the embodiment.

FIG. 7 is an explanatory diagram of a recording operation according to the embodiment.

FIG. 8 is a block diagram showing a specific embodiment of the signal recording / reproducing apparatus according to the present invention.

FIG. 9 is an explanatory diagram showing an example of a screen configuration of the monitor TV in the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Camera 2 ... Synchronization separation part 3 ... Video signal A / D conversion part 4, 14 ... Video signal storage part 5 ... Sensor 6 ... S / H part 7 ... Electric signal A / D conversion part 8 Synchronization signal generator 9, 15 Electric signal storage 10 Display synchronization signal generator 11 Display controller 12 Monitor TV 13 Trigger generator

Claims (10)

[Claims] 1. A photographing means for outputting a video signal corresponding to a photographed image, a measuring means for measuring a predetermined measurement target and outputting an electric signal corresponding to the measured value, and an image outputted by the photographing means A storage unit that stores the signal and the electric signal output by the measurement unit in association with each other; a reading unit that reads out the video signal and the electric signal that are stored in the storage unit in association with each other; A signal recording / reproducing apparatus, comprising: display means for simultaneously displaying an image based on a read video signal and a measured value based on an electric signal. 2. A photographing means for outputting a television signal corresponding to a photographed video, and a video signal for an arbitrary scanning period and a synchronization indicating a synchronous position of the scanning period from the television signal outputted by the photographing means. Separating means for extracting a signal, a measuring means for measuring a predetermined object to be measured, and outputting an electric signal corresponding to the measured value, a synchronizing signal generating means for generating a sampling synchronizing signal having a predetermined period, and the measuring means Sampling means for synchronizing the electric signal output by the synchronizing signal generating means with the sampling synchronizing signal generated by the synchronizing signal generating means; sampling means for storing the image signal extracted by the separating means; and scanning of the image signal Signal storage means for storing data indicating the period and the sampled electric signal in association with each other; and a display for generating a display synchronization signal of a predetermined cycle. A signal generation unit; a video reading unit that reads a video signal stored in the video storage unit in synchronization with a display synchronization signal generated by the display synchronization signal generation unit; and a display generated by the display synchronization signal generation unit. A signal readout unit for reading out data and an electric signal stored in association with the signal storage unit in synchronization with a synchronization signal; and a display synchronization signal generated by the display synchronization signal generation unit. Display means for simultaneously displaying a measured value based on the electric signal read by the reading means and an image corresponding to the data read by the signal reading means, and displaying the image based on the video signal read from the video storage means; A signal recording / reproducing apparatus comprising: 3. The signal recording / reproducing apparatus according to claim 1, wherein a trigger signal is output when a predetermined condition is satisfied when the video signal and the electric signal are recorded. Means, and a storage means for storing the video signal and the electric signal written during a predetermined period immediately before and immediately after the output of the trigger signal, out of the stored video signal and the electric signal. Recording and playback device. 4. The signal recording and reproducing apparatus according to claim 3, wherein said trigger signal generating means outputs a trigger signal after a set time has elapsed. 5. The signal recording / reproducing apparatus according to claim 3, wherein the trigger signal generating means outputs a trigger signal when an image changes on a photographing screen of the photographing means. apparatus. 6. The signal recording / reproducing apparatus according to claim 3, wherein the trigger signal generating means outputs a trigger signal when an image changes in a predetermined area set on a photographing screen of the photographing means. A signal recording / reproducing device characterized by the above-mentioned. 7. The signal recording / reproducing apparatus according to claim 6, wherein the number, position, and size of the predetermined area on the photographing screen are set to arbitrary values. 8. The signal recording / reproducing apparatus according to claim 3, wherein said trigger signal generating means outputs a trigger signal when detecting a predetermined color on a photographing screen of said photographing means. A signal recording / reproducing apparatus characterized in that: 9. The signal recording / reproducing apparatus according to claim 3, wherein the trigger signal generation unit generates a trigger signal when an electric signal output from the measurement unit satisfies a predetermined condition. A signal recording / reproducing device for outputting. 10. The signal recording / reproducing apparatus according to claim 3, wherein when a trigger signal is output, the signal recording / reproducing apparatus is automatically connected to a remote monitoring center or the like via a communication line, and A signal recording / reproducing apparatus for transferring a signal recorded in the recording / reproducing apparatus to a remote place.