JPS59135317A - Phenomenistic waveform memory - Google Patents

Abstract

PURPOSE:To record an accidental phenomenistic waveform excactly from the initial state in seismic measurement, biological reaction or the like by making the delay time in a time signal and a phenomenistic waveform signal equal to facilitate the reproduction work of recording data for unification of data. CONSTITUTION:A real time signal generation circuit 60 generates a real time signal indicating the actual time at which a phenomenon takes place actually and an arithmetic circuit 70 subtracts the delay time of a delay amplifier 10 from the real time signal to make a delay time signal. When the level of a phenomenistic waveform signal exceeds a specified value, a starting signal is generated from a comparator 21 and after a specified time, the operation of a signal recording means 31 is stabilized to ensure that the accidental phenomenon is recorded exactly from the initial state. As the time signal recorded simultaneously with the phenomenistic waveform signal has the same delay, all can be processed on a real time thereby facilitating the reproduction work of data and ultimately enabling unification of data.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device that reliably records sudden phenomenon waveforms from their initial state in earthquake measurements, tests of structures, machines, etc., biological reactions, and the like.

When recording the above-mentioned sudden phenomenon waveform, there is a known device that records with a delay of several seconds from the actual time in order to prevent the influence of transients until the recording medium of the recording device reaches a certain speed.

An example of this device is shown in block diagram form in FIG. A phenomenon waveform signal obtained by converting the sudden phenomenon into an electrical signal is sent to the delay amplifier 10 for a predetermined period of time (for example, 5 seconds).
After being delayed, it is recorded on a recording medium such as a magnetic tape by a magnetic recording means 30 such as a magnetic recording/reproducing device. The magnitude amplifier 20 calculates a composite vector of the x, y, and z axis components of the above-mentioned phenomenon waveform signal, and when the output level is higher than a predetermined value, the comparator 21 outputs an activation signal. At this time, the magnetic recording means 30 starts operating.

That is, the voltage of the battery 24 is divided by resistors 22 and 23, and when the output level of the magnitude amplifier 20 becomes higher than the divided voltage, the magnetic recording means 30 starts operating. By doing this, the phenomenon waveform signal at the time when the activation signal is received is sent to the magnetic recording means 30 after 5 seconds, and at that time, since the recording medium such as the magnetic tape has reached a certain speed, the magnetic The influence of transients on the recording means 30 can be prevented.

Here, the delay amplifier 10 includes a D/A converter, a memory, an A
The memory is generally composed of a /D converter, and a multi-stage shift register is used as the memory.

Moreover, its frequency characteristics are low, about 50 Hz.

On the other hand, it is convenient to record the phenomenon waveform signal and the time of occurrence at the same time in the magnetic recording means 30, and it is also convenient to display the actual time at the observation location.

From this point of view, the time display 50 displays the time upon receiving a signal from the digital clock 40, and the time signal generation circuit 41 sends the time signal to the magnetic recording means 30.

Further, in the conventional example described above, the digital clock 40 operates according to the real time, and the time display 50 also displays the real time.

The time signal generation circuit 41 also generates a time corresponding to the real time. Therefore, the phenomenon waveform signal and the time signal are recorded in the magnetic recording means 30 with a difference, and the time signal is recorded earlier than the phenomenon waveform signal by the delay time.

However, in the above-mentioned conventional examples, since the time signal and the phenomenon waveform signal are recorded out of sync, there is a problem that the work when reproducing the signal is complicated. That is, since the delay time of the delay amplifier 10 differs depending on the observation location, it is necessary to check the delay time of the time signal each time it is reproduced and recreate the data according to the delay time. Furthermore, the fact that the delay time varies depending on the observation location also means that it is difficult to unify the data.

On the other hand, it is possible to make the delay of both signals the same by passing the time signal through the delay amplifier 10. However, this method is currently difficult to implement because the frequency characteristics of the delay amplifier 10 are low (approximately 50 Hz) even though the frequency of the time signal is relatively high (approximately IKHz). This would require an even more expensive delay amplifier.

Further, as another countermeasure, it is possible to delay the display of the digital clock 40 in advance in the same manner as the delay time of the delay amplifier 10. However, this method has the inconvenience that the display on the time display 50 is different from the actual time.

The present invention has been made by focusing on the above-mentioned conventional problems, and provides an apparatus for reliably recording waveforms of sudden phenomena in earthquake measurements, tests of structures, machines, etc., biological reactions, etc. from their initial state. It is an object of the present invention to provide a phenomenon waveform recording device that can unify data by facilitating recording and reproducing the recorded data.

In order to achieve this object, the present invention includes a delay amplifier that delays a phenomenon waveform signal by a predetermined time, a real time signal generation circuit that generates a signal indicating the real time, and a real time signal generation circuit that generates a signal indicating the real time. A time display that displays the time, an arithmetic circuit that generates a delayed time signal by subtracting the delay time of the delay amplifier from the real time signal, and simultaneously records the output signal of the delay f-amp and the delayed time signal of the arithmetic circuit. The invention is characterized in that it has a signal recording means.

Hereinafter, the present invention will be described in detail based on embodiments shown in the accompanying drawings. Incidentally, the same members as those shown in FIG. 1 are given the same reference numerals, and the explanation thereof will be omitted.

FIG. 2 is a block diagram showing one embodiment of the present invention. The real time signal generating circuit 60 generates a signal (actual time signal) indicating the same time as the time when a phenomenon actually occurs (actual time). The time display 51 displays the real time according to this real time signal, and displays the year, month, day, hour, minute, and second. The arithmetic circuit 70 is a circuit that generates a delayed time signal by subtracting the delay time of the delay amplifier 0 from the real time signal. The delay time setting circuit 71 is a circuit that sets the difference in the arithmetic circuit 70. The signal recording means 31 is for simultaneously recording the output signal of the delay amplifier 10 and the delay time signal of the arithmetic circuit 70, and its recording medium may be a magnetic material such as a magnetic tape or a magnetic disk. It may be the material used.

Further, the signal recording means 31 starts its operation in response to the activation signal from the comparator 21, which is the same as the magnetic recording means 30 shown in FIG.

Next, the operation of the above embodiment will be explained. First, it is assumed that the delay amplifier 10 has a delay time of 5 seconds. This 5
Depending on the delay of seconds, the delay time setting circuit 71 sets the arithmetic circuit 70 to delay the operation by five seconds. Therefore, the output signal of the arithmetic circuit 70 is always 5
A delayed time signal delayed by seconds is output.

On the other hand, the time display 51 always displays the real time by the real time signal generation circuit 60. For this reason, it is convenient for the operator on the observation side because there is no need to make corrections at the actual time.

Here, if the level of the phenomenon waveform signal is less than a predetermined value, the activation signal is not generated and the signal recording means 31 does not operate. If the level exceeds a predetermined value, an activation signal is generated, and after a predetermined time (within 5 seconds) from the generation of the activation signal, the signal recording means 31 stabilizes its operation. Then, after this normal operation has started, a phenomenon waveform signal of the sudden phenomenon that occurred when the activation signal was generated reaches the signal recording means 31. Therefore, the sudden phenomenon is reliably recorded from its initial state.

Furthermore, since the delay in the time signal and the delay in the phenomenon waveform signal can be adjusted and matched on the observation side, labor is greatly saved when intensively processing observation data. In other words, since the time signal recorded at the same time as the phenomenon waveform signal has the same delay, all processing can be done in real time, the data can be easily reproduced, and data can be unified. . The scope of application of the present invention is not just earthquake observation, but also automobiles.

This also includes the case of measuring vibrations of transportation vehicles such as ships.

As described in detail above, the present invention provides phenomenon waveform recording that makes it possible to unify data by facilitating playback of recorded data when a sudden phenomenon waveform is reliably recorded from its initial state. equipment can be provided.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a conventional phenomenon waveform recording device, and FIG. 2 is a block diagram showing an embodiment of the present invention. 10... Delay amplifier, 21. Old... Comparator, 31... Signal recording means, 51.
Old: Time display, 60: Real time signal generation circuit, 7o: Arithmetic circuit.

Claims (1)

[Claims] a delay amplifier that delays the phenomenon waveform signal by a predetermined time; a real time clock signal generating circuit that generates a signal indicating the real time; and a time display that displays the real time in accordance with the real time signal;
It is characterized by comprising an arithmetic circuit that generates a delayed time signal by subtracting the delay time of the delay amplifier from the real time signal, and a signal recording means that simultaneously records the output signal of the delay amplifier and the delayed time signal of the arithmetic circuit. Phenomenon waveform recording device.