JP3364312B2 - Waveform recording device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waveform recording apparatus,
In particular, the present invention relates to a waveform recording device that records an analog waveform of an input signal and its waveform data in real time. FIG. 6A shows an example of a conventional apparatus. An analog input signal is sampled, for example, at the input unit 1, and the digitally converted waveform data is once taken into a storage memory (hereinafter, referred to as “DRAM”) 2. When the waveform data reaches a required amount, for example, the CPU 3 stops inputting data to the DRAM 2, reads out the waveform data captured up to that time, and adds it to the printer 6. Thus, the analog waveform of the input signal is recorded on the recording paper of the printer 6. When the read waveform data is given to the display 5 as needed, the analog waveform of the input signal is reproduced on the screen,
Used by equipment operators for monitoring. The operation of taking in waveform data into the DRAM 2, displaying the waveform of an input signal on the display 5, and recording the waveform of the input signal on the printer 6 is instructed by operating keys (not shown) of the operation unit 4. I have. FIG. 6B shows an example of a waveform recording device provided with, for example, a magnetic tape device 7 instead of the printer 6. In this example, when the required amount of waveform data is fetched into the DRAM 2, the CPU 3 reads it out, sends it to the magnetic tape device 7, and records and holds it on a magnetic tape (not shown) mounted on the magnetic tape device 7.
Thereafter, the CPU 3 reads out the waveform data of the desired signal from the magnetic tape device 7 and supplies it to the display 5 to reproduce the analog waveform of the input signal on the screen. In the apparatus shown in FIG. 6A, a magnetic tape device or the like is separately prepared for storing the waveform data captured in the DRAM 2, and the waveform data is stored on the magnetic tape. Need to be recorded. That is,
Two devices are required, which is not preferable. In the apparatus shown in FIG. 6B, when the CPU 3 reads out the waveform data of the input signal from the DRAM 2 and records it on the magnetic tape device 7, the operator may want to confirm the analog waveform at an arbitrary position. is there. In this case, the waveform can be reproduced on the screen of the display 5 and monitored. However, for that purpose, the data reading speed of the CPU 3 needs to be slowed down so that the reproduced waveform can be visually observed. It takes a lot of time to finish recording the waveform data. Therefore, generally, a printer is separately prepared, and a waveform is written on the recording paper at a high speed for use as a monitor. However, two devices are also required, and wasteful consumption of the recording paper increases. [0008] As an example of improving the difficulties in the above two conventional apparatuses, for example, a waveform recording apparatus having a display 5, a printer 6, and a magnetic tape device 7 as shown in FIG. By the way, the speed at which the printer 6 records a waveform on recording paper depends on the number of rotations of a motor for feeding the recording paper and C
The speed at which the waveform data is recorded on the magnetic tape of the magnetic tape device 7 depends on the rotational speed of the motor for feeding the magnetic tape and the operating speed of the CPU 3, depending on the operation speed of the PU3. The sampling frequency of the input signal in the input unit 1 is determined in consideration of the above conditions. In the example of FIG. 7, when high-speed recording is performed at a speed corresponding to the sampling speed on either the recording paper of the printer 6 or the magnetic tape of the magnetic tape device 7, the performance of the CPU 3 cannot keep up. Therefore, recording on the other side becomes impossible. That is, even if a printer and a magnetic tape device are provided, the result is substantially the same as the example shown in FIG. 6A or FIG. 6B. For example, in order to simultaneously record both, it is necessary to lower the sampling frequency. . However, if the sampling frequency is lowered, the upper limit frequency of the input signal must be lowered, so that the band used becomes narrower. The present invention has been made in consideration of the above circumstances, and has as its object to record a waveform of an input signal and its waveform data on a recording paper of a printer and a magnetic tape of a magnetic tape device in real time. It is an object of the present invention to provide a waveform recording device that can perform the recording. [0011] To solve the above problems BRIEF SUMMARY OF THE INVENTION The inventions is a wave obtained by sampling from the input signal
Shape data is recorded and stored on the magnetic tape of the magnetic tape unit
And then stores the stored waveform data in a printer and display.
In addition to the device, the printer's recording paper and display device
Record the analog playback waveform of the above input signal on the screen
And a waveform recording device for displaying the magnetic tape,
Direct access to the magnetic tape unit
A predetermined amount of waveform data recorded in the memory
DMA controller to load and sample the input signal
Speed corresponding to ring cycle or same sampling cycle
Each waveform data can be simultaneously read from the above memory at any slower speed.
The printer and the display device.
First and second CPUs respectively added to the
And a dual-port RAM is used as the memory.
It is characterized by: As described above, the control operations for the display, printer, and magnetic tape device are shared by the two CPUs and the DMA controller, thereby recording the waveform data of the input signal and the reproduced waveform thereof in real time. Can be. FIG. 1 shows an embodiment of the present invention. The difference from the device example of FIG. 7 is that, for example, two CPUs 3a and 3b, a dual-port RAM 8, and a DMA controller 9 are provided. Hereinafter, the operation of this device will be described. When a measurement start key (not shown) is pressed, an analog input signal is sampled, for example, at the input unit 1, and the digitally converted waveform data is taken into the DRAM 2. The first CPU 3a has a DR
The waveform data fetched into the AM 2 is sequentially read out in real time and applied to, for example, a printer 6 to record the analog waveform on a recording sheet. Similarly, the second CPU 3b sequentially reads out the waveform data taken in the DRAM 2 in real time and gives it to, for example, a display 5 to display the analog waveform on a screen, which is used for monitoring by a person handling the apparatus. When the waveform data fetched into the DRAM 2 reaches a predetermined amount, for example, the DMA controller 9 directly accesses the DRAM 2 and sends the waveform data to the magnetic tape device 7, and the magnetic controller (not shown) mounted on the device 7 Record on tape. FIG. 2 shows the second CPU 3b (C
PU (2)) displays the analog waveform of the input signal measured on the display and, for example, the first C
An example in which a PU3a (CPU (1)) is allowed to interrupt for 1 ms and records waveform data in a printer, and on the other hand, records measurement data in a magnetic tape device via a DMA controller is shown in a flow diagram. In FIG. 2, examples of the operations of the first CPU (1) and the DMA controller are shown in FIGS. 3A and 3B, respectively. By monitoring the waveform displayed on the screen of the display 5 and / or the waveform recorded on the recording paper sent out by the printer 6, the operator of the apparatus can determine the waveform data of any kind of signal. 7 is recorded. In this case, the operation unit 4
By operating the keys (not shown), it is possible to continuously record the waveform of the input signal on the recording paper of the printer 6 or to partially record only the portions deemed necessary. The reproduction of the waveform data recorded on the magnetic tape of the magnetic tape device 7 is performed as follows. When a playback start key (not shown) of the operation unit 4 is pressed, for example, the DMA controller 9 first loads a predetermined amount of waveform data recorded on the magnetic tape of the magnetic tape device 7 into the dual port RAM 8. Next, the first CPU 3a sequentially reads out the waveform data from the dual port RAM 8 and supplies it to the printer 6 to record the analog waveform on a recording paper. The second CPU 3b sequentially reads out the waveform data from the dual port RAM 8 and supplies it to the display 5 to display the analog waveform on the screen. FIG. 4 shows that the second CPU (2) allows a 1 ms interrupt to the first CPU (1) and loads the waveform data from the magnetic tape device to the dual port RAM via the DMA controller. , The first CP
U (1) shows an example in which the waveform of the input signal is reproduced by the printer, and the second CPU (2) itself displays the waveform on the display. In FIG. 4, the first CPU
FIGS. 5A and 5B show (1) and an example of the operation of the DMA controller, respectively. In this case, the waveform data reading speed of the CPU 3a and CPU 3b can be set to the same speed as the sampling period at the time of the above measurement or to any lower speed lower than that. In addition, it is also possible for the apparatus operator to monitor the reproduced waveform on the display 5 and write only the waveform of a portion considered necessary on the recording paper by the printer 8 in the same manner as in the above measurement. As described above in detail, according to the present invention, the two CPUs share and control the printer and the magnetic tape device, which take a long time to control the operation, so that the analog reproduction waveform of the input signal can be reduced. The waveform data can be recorded in real time and simultaneously. Therefore, the waveform measurement which conventionally required two devices can be performed by one device, which is extremely convenient and can be expected to expand the range of use. In addition, since only the waveform at the place deemed necessary can be recorded by the printer at any time while monitoring the screen of the display, wasteful use of the recording paper can be reduced. When the waveform data is recorded on the magnetic tape, the analog waveform can be monitored, so that there is a sense of security for the apparatus operator.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an electrical configuration of a waveform recording device according to the present invention. FIG. 2 is a flowchart showing an operation example of a CPU (2) in a waveform measurement data recording process of the waveform recording device according to the present invention. FIG. 3 shows a CPU (1) and a DMA controller shown in FIG. 2 ;
Flowchart showing an operation example of the emission controller. FIG. 4 is a flowchart showing an operation example of a CPU (2) in a waveform reproduction process from recorded data of the waveform recording apparatus according to the present invention. FIG. 5 is a diagram showing a CPU (1) and a DMA controller in FIG. 4 ;
Flowchart showing an operation example of the emission controller. FIG. 6 is a block diagram showing an electrical configuration of a conventional device. FIG. 7 is a block diagram showing an electrical configuration of a conventional device. [Description of Signs] 1 Input unit 2 Storage memory 3a CPU 3b CPU 5 Display device 6 Printer 7 Magnetic tape device 8 Dual port 9 DMA controller

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-5-60596 (JP, A) JP-A-5-318837 (JP, A) JP-A-63-229391 (JP, A) 20769 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) G01D 9/00 G06F 17/40

Claims (1)

(57) Claims 1. Waveform data obtained by sampling from an input signal is recorded and held on a magnetic tape of a magnetic tape device.
And then stores the stored waveform data in a printer and display.
In addition to the device, the printer's recording paper and display device
Record the analog playback waveform of the above input signal on the screen
And a waveform recording device for displaying the magnetic tape,
Direct access to the magnetic tape unit
A predetermined amount of waveform data recorded in the memory
DMA controller to load, and the speed or the speed corresponding to the sampling period of the input signal.
Is the above memory at any speed slower than the same sampling cycle
From the printer at the same time.
And first and second additions to the display device, respectively.
And two CPUs and a dual memory
A waveform recording device using a port RAM .