JPH0132563B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for recording trigger signals on a magnetic tape using a data recorder in order to easily analyze recorded signals.

Conventionally, the following two methods have been mainly used to extract data on a tape measured by a data recorder and send it to an FFT, AD converter, or the like.

(1) Record a time code on the tape during recording and use this to extract recorded data.

(2) Monitor the signals recorded on the tape with an oscilloscope, etc., and extract the parts necessary for processing.

However, method (1) requires a system for recording time codes, making the device complex. Moreover, it is troublesome to handle. Furthermore, the method (2) has the drawback of lack of accuracy and the drawback of not being able to automatically capture data.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a trigger signal recording method for a data recorder that can easily and accurately record a trigger signal for inputting data into an analyzer or the like.

To achieve the above object, the present invention includes a plurality of recording heads arranged to correspond to a plurality of channels of a magnetic tape and juxtaposed with each other, and a plurality of recording heads arranged at a certain distance in the tape running direction with respect to the recording heads. and a plurality of playback heads disposed so as to correspond to the plurality of channels and juxtaposed with each other so that the magnetic tape can be run in the forward direction for recording and playback;
A multi-channel data recorder capable of running the magnetic tape in the reverse direction and performing recording and reproduction using the same recording and reproducing head as when running in the forward direction is provided, and the magnetic tape is run in the forward direction. An information signal is recorded on a main recording/reproducing channel selected from the plurality of channels, and then the information signal of the main recording/reproducing channel is reproduced by the reproducing head by running the magnetic tape in a reverse direction. determining a trigger time, generating a delayed trigger signal that gives a tape running time delay corresponding to the distance between the recording head and the reproducing head to the trigger time, and causing the magnetic tape to continue running in the reverse direction; The present invention relates to a trigger signal recording method for a data recorder, characterized in that the delayed trigger signal is recorded by the recording head on a trigger signal recording/reproducing channel selected from the plurality of channels.

According to the above invention, the tape is run in the opposite direction, the trigger point is determined based on the playback output, and the trigger signal is recorded in the recording head with a delay corresponding to the interval between the recording head and the playback head. Therefore, it becomes possible to easily and accurately record the trigger signal using the selected channel from the multi-channel data recorder. Note that recording the trigger signal makes it possible to import data from the tape in synchronization with the trigger signal during analysis, etc., making it possible to use memory etc. effectively.

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a multi-channel data recorder capable of recording and reproducing in forward and reverse directions according to an embodiment of the present invention. In this figure, 1
a, 1b...1n are input terminals for multiple channels, 2
a, 2b...2n are recording amplifier circuits, 3a, 3b...3
n is a recording head, 4a, 4b...4n are playback heads, 5a, 5b...5n are playback amplifier circuits, 6a, 6
b...6n is a reproduction output terminal. The recording heads 3a-3n and the reproducing heads 4a-4n are arranged a distance T apart from each other in the tape running direction, as shown in FIG. 2, and the heads of each channel are arranged side by side on a line.

Generally, a data recorder is composed of the above parts, but the data recorder of this embodiment further includes a trigger detection device 7, a trigger signal generation circuit 8,
Delay circuit 9, AND gate 10 for determining delay time
and a light emitting element 11. Furthermore, the trigger detection device 7
is the playback output terminal 6 of the main recording and playback channel.
This is, for example, an oscilloscope that is selectively connected to terminals a, 6b, etc. via a line 12, and is used to determine the trigger point from the waveform of the measurement signal and operate the trigger switch 13. Further, the delay circuit 9 is a variable delay circuit including a variable element 14 for adjusting delay time.

When recording measurement signals with the circuit configured in this way, the tape 16 is run in the forward direction as shown by the arrow 15 in FIG. supply the signal,
Recording heads 3a, 3b, etc. record measurement signals on channels a and b, for example, as shown in FIG.

When recording a trigger signal on the tape 16 on which the measurement signal has been recorded, connect the output line 18 of the delay circuit 9 to the input terminal 1n of the trigger recording/reproducing channel using a plug and jack combination, and also connect this channel to the input terminal 1n of the trigger recording/reproducing channel. The input line 19 of the AND gate 10 is connected to the output terminal 6n of the AND gate 10 by a plug and jack combination. Then, the recording head 3a~
In order to set the delay time corresponding to the distance T between the playback head 3n and the playback heads 4a to 4n, the tape 16 is run at a predetermined playback speed in the opposite direction shown by the arrow 17 in FIG. Attempt to record the trigger signal. That is, the switch 13 is turned on at time _t1 in FIG.
Record on tape with n. The recorded trigger signal is played back by the playback head 4n after a certain period of time, and
It becomes an input to gate 10. The reproduction trigger signal shown in FIG. 3B and the delayed trigger signal shown in FIG. 3C are input to the AND gate 10, and when both signals match, a high level output is generated and the light emitting element 11 lights up. If the delay time t ₁ to t ₂ given by the delay circuit 9
and the distance T between the recording head 3n and the reproducing head 4n.
If there is a difference between the delay time of the recording and reproducing system based on the above, the light emitting element 11 does not light up, and the trigger signal is generated a plurality of times to adjust the delay time using the variable element 14.

After completing the adjustment of the delay time, connect the output terminals 6a and 6b of the main recording/reproducing channel to line 12 using a plug and jack combination method.
The tape 16 is run in the opposite direction as shown by the arrow 17 in FIG. 2, the recording signal is observed by the detection device 7 consisting of an oscilloscope, and the switch 13 is turned on in synchronization with the end of the measurement waveform to generate a trigger signal. let The trigger signal is recorded on the tape 16 by the recording head 2n with a delay corresponding to the distance T between the recording head 2n and the reproducing head 4n set by the delay circuit 9. As a result, as shown by channel n in FIG. 2, a trigger signal synchronized with the measurement signal is recorded.

When sending a signal to an analyzer such as FFT, the output terminals 6a to 6n are connected to the analyzer, and the tape 16 is run in the forward direction shown by the arrow 15. This results in
The trigger signal is reproduced by the reproduction head 4n, the trigger signal is input to the analyzer, and writing of data to the memory of the analyzer is started.

As is clear from the above, since the trigger signal is recorded by running the tape in the opposite direction, it becomes possible to record the trigger signal with the preceding recording head 2n. Therefore, by configuring the trigger signal recording device as an external device and connecting it to the input terminal 1n and output terminals 6a to 6n of the main body, without providing a special trigger signal recording device inside the main body of the data recorder, Recording of the trigger signal becomes possible and recording of the trigger signal becomes easy.

Further, an AND gate 10 and a light emitting element 11 are provided,
Since the delay time can be adjusted, the optimum delay time can be easily and accurately set.

Furthermore, since the trigger signal recording system is configured to be able to be separated, it is possible to use all the recording and reproducing systems of n channels from the input terminal 1n to the output terminal 6n for recording and reproducing measurement signals. .

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments and can be further modified. For example, it is of course applicable to FM recording and playback. Further, trigger signals may be recorded on multiple channels. Furthermore, the trigger signal may not be a single pulse, but may be a plurality of pulses or a digital signal. In addition, the trigger detection device 7
consists of a rectifier circuit that rectifies the main recording/reproducing output and a comparator that compares this output with a reference level (trigger level), and the switch 13 is turned on in synchronization with the inversion of the output of the comparator, or The trigger generation circuit 8 may be directly driven.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a data recorder according to an embodiment of the present invention, FIG. 2 is a plan view showing the relationship between recording on a tape and a head, and FIG. 3 shows points A to C in FIG. FIG. In addition, in the symbols used in the drawings, 2a~
2n is a recording amplifier circuit, 3a to 3n are recording heads,
4a to 4n are reproduction heads, 5a to 5n are reproduction amplifier circuits, 6a to 6n are output terminals, 7 is a trigger detection circuit, 8 is a trigger signal generation circuit, and 9 is a delay circuit.

Claims (1)

[Scope of Claims] 1. A plurality of recording heads arranged to correspond to a plurality of channels of a magnetic tape and juxtaposed with each other, and a plurality of recording heads arranged at a certain distance in the tape running direction with respect to the recording heads. and a plurality of playback heads arranged in parallel to each other so that recording and playback can be performed by running the magnetic tape in the forward direction, and recording and playback can be performed by running the magnetic tape in the reverse direction. A multi-channel data recorder capable of running the magnetic tape and performing recording and playback using the same recording and playback head as when running in the forward direction is provided, and the magnetic tape is run in the forward direction to select one of the plurality of channels. An information signal is recorded in the main recording/reproducing channel, and then the magnetic tape is run in the reverse direction to reproduce the information signal in the main recording/reproducing channel by the reproducing head to determine a trigger point, generating a delayed trigger signal that gives a tape running time delay corresponding to the distance between the recording head and the reproducing head at the trigger time, and selecting one of the plurality of channels while continuing the running of the magnetic tape in the reverse direction; A trigger signal recording method for a data recorder, characterized in that the delayed trigger signal is recorded by the recording head in a trigger signal recording/reproducing channel.