JPS6390004A - Data recorder - Google Patents

Abstract

PURPOSE:To properly and simply execute calibration at the time of reproduction by temporarily holding a calibration signal, selectively outputting the signal and adjusting a reproduced signal level based on the outputted signal. CONSTITUTION:A changeover switch 16 is connected to the side of a selection switch 18 by operating a control part 14. When only a holding amplifier 12 is turned to a driving state by the control part 14 during the period that a calibration signal CS inputted to a terminal A is kept at the zero level, the zero level is held on the amplifier 12. The output of the amplifier 12 is inputted to a recording part 18 selectively through switches 15, 16 and an output amplifier 17. A recording pen 19 is adjusted so as to set up on a zero scale of recording paper 20 by operating a control 18a. Then, the amplifier 11 is turned to the driving state during the period of inputting the span of the signal CS, the switch 15 is connected to the output terminal of the amplifier 11 and the positive span level of the signal CS is adjusted by a control 18b. Similarly, a negative span level is adjusted through an amplifier 13.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a data recording device.

(Prior technology) To measure the running performance and driving performance of a vehicle, it is necessary to actually drive the vehicle for a long time and collect data that affects the performance of the vehicle, such as the acceleration, the force applied to various parts, and the temperature of various parts around the engine. The current method is to record data on magnetic tape and then analyze the data.

To analyze data recorded on a magnetic tape, normally, as shown in Figure 3, the data recorded on the magnetic tape 2 is reproduced by a data recorder 1, and the reproduced signal is sent to a recorder 3 such as a pen recorder. Recording is performed on recording paper 4 and the recorded results are used. During recording, the zero position and deflection of the recording pen are adjusted to limit the recording width and to make the recorded results easier to read in relation to the scale of the recording paper. A so-called calibration process is performed in which the width and other parameters are adjusted using the recorder's knobs according to the amount of measured data.

As shown in FIG. 4, in the calibration, one cycle of the calibration signal C8 corresponding to the zero value and the value close to the peak value of the measurement data D is recorded on the magnetic tape before recording on the recording paper. Then, by reproducing this calibration signal C8, the zero position of the recording pen (
Then, using the peak value signal, the maximum deflection position in the positive and negative directions (referred to as span) is adjusted to match the scale of the recording paper.

By the way, if you adjust the span using the peak value signal, the zero position may deviate from the zero of the scale, so rewind the magnetic tape and play the calibration signal again.
Adjust the shifted zero position.

However, when the zero position is adjusted, the span may shift, and in that case, it is necessary to adjust the span again. In this way, zero adjustment and positive,
Repeat the negative span adjustment several times (at least 3 or 4 times) to complete the adjustment. It is necessary to perform such a calibration work for each channel of the magnetic tape.

As described above, in conventional calibration work, the tape must be rewound many times in order to reproduce the calibration signal, and the level adjustment must be repeated many times each time, making the operation cumbersome and time-consuming. Normally, in this type of data recording, all the different data recorded simultaneously on several channels or more of magnetic tape are reproduced and recorded on recording paper, so the calibration work is enormous, and the time required for it is not only the waiting time between channels. It will take a considerable amount of time to add.

In addition to performing the calibration work manually, it is also possible to use a computer, but this requires equipment. Another option is to consider the output level in advance to determine the input level when reproducing data on a magnetic tape, but the equipment for this would be large-scale and would be difficult to install in a car. This requires more equipment and is difficult to implement.

(Object and Structure of the Invention) The present invention has been made in view of the above points, and an object of the present invention is to appropriately and easily calibrate data signals of data recorded on a tape when playing back. In order to achieve this, it is possible to temporarily store the calibration signal, selectively output the retained calibration signal, and reproduce the recording device data signal based on the output calibration signal. Configured to adjust signal level.

(Example) The present invention will be explained below based on the drawings.

FIG. 1 shows an embodiment of a data recording device according to the present invention.

In this embodiment, the main part of the apparatus is constructed of analog circuits, and measurement data reproduced from a magnetic tape by a data recorder is input to terminal A shown at the left end of the figure.

In the figure, 10 is an input amplifier, 11.12° 13 is a hold amplifier that holds and amplifies the output level from the input amplifier 1 in a capacitor based on the command from the control unit 14, 11 is for the positive span, and 12 is for the positive span. 13 is for zero, and 13 is for negative span. Reference numeral 15 denotes a selection switch which is connected to one of the output terminals of the hold amplifiers 11, 12.13 by a command from the control section 14, and the switching is performed in conjunction with the selection operation of the hold amplifiers 11, 12.13 by the control section 14. There is. Reference numeral 16 denotes a changeover switch which is connected to one contact of the selection switch 15 in the calibration mode and to the output terminal of the input amplifier 10 in the measurement mode according to the command =5- from the control unit 14;
17 is an output amplifier; 18 is a recording unit including a drive circuit that drives the recording pen 19 based on a signal from the output amplifier 17; knobs 18a and 18b are provided for zero adjustment and span adjustment of the recording pen 19; ing.

Next, the calibration work in this embodiment will be explained.

Magnetic tape playback data including a calibration signal C8 as shown in FIG. 4 is input to terminal A.
In the calibration mode, the control section 14 is operated to connect the changeover switch 16 to the selection switch 18 side.

Now, the calibration signal C8 input to terminal A
If only the hold amplifier 12 is activated by operating the control unit 14 during the period t1 during which the hold amplifier 12 is at the zero level, the hold amplifier 12 is held at the zero level. The output of the hold amplifier 12 is connected to the selection switch 15 and the changeover switch 1.
6, the signal is amplified by an output amplifier 17, and input to a recording section 18. Therefore, the operator can operate the knob 18a to adjust the level of the drive circuit of the recording section 18 so that the recording pen 19 is placed on the zero scale of the recording paper 20. Since the zero level duration time t1 of the calibration signal @O8 is several seconds, zero adjustment can be made sufficiently during this period.

After the zero adjustment is completed in this way, the positive span level of the calibration signal C8 arrives, so during this period t2, the control unit 14 is operated to activate the hold amplifier 11, and the selection switch 15 is turned on to the hold amplifier. Connect to the output terminal of 11.

As a result, the positive span level of the calibration signal C8 is held in the hold amplifier 11.

The output of the hold amplifier 11 is amplified by the output amplifier 17 via the selection switch 15 and the changeover switch 16, and is sent to the drive circuit of the recording section 18 to swing the recording pen 19. Therefore, the operator operates the knob 18b of the recording section 18 to adjust the normal span in accordance with the scale of the recording paper. This span adjustment may be performed during t2 when the positive span level of the calibration signal C8 continues.

When the normal span adjustment is completed in this way, the zero level of the calibration signal C8 is reached for a period of 13, so it is only necessary to check the position of the recording pen, which has already been zero-adjusted, in line with the scale of the recording paper during this period.

Next, during the period t4 during which the negative span level of the calibration signal O8 has arrived, the control unit 14 is operated to operate the hold amplifier 13, and the selection switch 15 is connected to the output terminal of the hold amplifier 13, as described above. Similarly, based on the negative span level held in the hold amplifier 13, the position of the recording pen 19 is adjusted in negative span according to the scale of the recording paper 20 using the knob 18b of the recording section 18.

In this way, it is sufficient to complete the adjustment of zero, positive span, and negative span, but if the period t1 of the calibration signal C8
．． t2. Even if the adjustment is not completed during t4, or even if the adjustment is completed once again, the hold amplifiers 11, 12 and 13 will maintain the positive span level, zero level, and negative span level, respectively. Therefore, any level can be input to the recording section 18 by operating the control section 14, and the position of the recording pen can be adjusted, ie, calibrated.

When the calibration is completely completed, the controller 14 is operated again to switch the selector switch 16 to the output terminal of the input amplifier 1. Thereafter, the reproduced measurement data D (see FIG. 4) input from the terminal A is input to the input amplifier 10. input to the recording section 18 via the changeover switch 16 and the output amplifier 17,
Data is recorded on the recording paper 20 by the recording pen 19 which has already been calibrated.

FIG. 2 shows another embodiment of the data recording apparatus according to the present invention, and this embodiment differs from the embodiment shown in FIG. 1 in that the main parts of the apparatus are constructed of digital circuits.

= 9- The same reference numerals and symbols as in FIG. 1 indicate the same components.

The difference from Figure 1 is that the hold amplifier is 11°12.13
Instead, memories 21, 22, and 23 are provided to store the positive span level, zero level, and negative span level, respectively, and in order to perform signal processing digitally, the reproduced measurement data input from the data recorder is digitized. /D
It is provided with a converter 24 and a D/A converter 25 that converts the positive span level, zero level, and negative span level stored in the hold memories 21, 22, and 23 into analogs.

The circuit operation of this embodiment is almost the same as that of the embodiment shown in FIG. 1, so a description thereof will be omitted. In this embodiment, since the span level and zero level are stored in memory, the level values remain unchanged, so there is no problem even if calibration takes a long time. On the other hand, in the embodiment shown in Figure 1, the span level and zero level are held by charging a hold amplifier using a capacitor, so if calibration takes a long time, the held level will decrease somewhat due to the discharge of the capacitor. It can be said that the embodiment shown in FIG. 2 is superior in that there is a possibility of this.

(Effects of the Invention) As explained above, in the present invention, positive and negative span levels and zero levels for calibration are temporarily held, and the held span levels and zero levels are arbitrarily output individually. Since the configuration is configured such that calibration is performed by using the calibration signal, the calibration work becomes easy, and the time required for calibration can be significantly shortened because there is no need to repeat the deposition of calibration signals as in the conventional case.

[Brief explanation of the drawing]

FIG. 1 is an embodiment of an analog data recording device according to the present invention, FIG. 2 is an embodiment of a digital data recording device according to the present invention, FIG. 3 is an explanatory diagram of the data recording method, and FIG. 4 is a magnetic FIG. 3 is a diagram showing the relationship between a calibration signal recorded on a tape and measurement data.

Claims (1)

[Claims] a calibration signal holding means for temporarily holding a calibration signal; a calibration signal outputting means for selectively outputting the calibration signal held in the calibration signal holding means;
1. A data recording device comprising: level adjustment means for adjusting a reproduced signal level of a data signal recorded in a recording means based on an output calibration signal.