JPS5866866A - Display device for waveform or the like - Google Patents

Abstract

PURPOSE:To permit storage of the waveforms of long-time transient phenomena in a memory by selecting an input buffer memory of large capacity and continuing writing from the point of the time when a trigger signal is generated until the point of the time when arbitrary writing times elapse. CONSTITUTION:A memory having capacity, for example, 16 times that of conventional memories is used for an input buffer memory 104. Arrangement is so made that up to the address by which the quantity of data enough to obtain one picture plane of a cathode-ray tube 126 are repeatedly taken into a waveform processing unit 113. an arbitrary number is set in a counter 129 for setting of a trigger level from the unit 113 so that in an automatic triger mode the writing into the memory 104 can be stopped after arbitrary writing times from the point of the time when the trigger signal is detected. Thus the waveforms of the transient phenomena inputted upon lapse of the time longer than one picture plane of the cathode-ray tube are taken into the memory.

Description

DETAILED DESCRIPTION OF THE INVENTION The invention relates to a display device for waveforms, etc., which can display the frequency spectrum of the analog hourglass IIR, and the histogram 5, etc. It is an object of the present invention to provide a display device such as a hand drum shape that can reliably contain an elephant drum shape.

Generally, a device capable of displaying the frequency characteristics of a target to be measured or the frequency spectrum of radio waves is called a spectrum analyzer. The Spectrum Analyzer measures Takasaki wave pirates ranging from several 100 KHI to several G.

By the way, measuring the frequency spectrum of a signal in the ultra-low III wave or ultrasonic band is an industrially important task. Conventionally, various types of measurements of this type have been developed. For example 1
Using a variable bandpass filter with steep characteristics called an iItII number analyzer, the center frequency of the town bandpass filter is swept, and the *m number component of the signal to be determined is analyzed. There is a method of recording the results on a recording paper using radar. In the case of recording the analysis results on recording paper in this way, if the characteristics of the subject become poorer over time, the characteristics will change and it will not be possible to see the results.

The cost reduction of four-way micro combinators has made it easier to introduce p-microcomputers.

By using a microcomputer, it is possible to analyze the frequency of a signal waveform in a short time using a high-speed Fourier transform processing ring. Stores 1,000 HIJ wavenumber analysis results in memory,
By displaying this at high speed, it can be displayed on a cathode ray tube. l using this microcomputer!
According to the 8-wavenumber analysis i, it is a matter of fact that the results of one wavenumber analysis can be displayed on the *other line tube.It is also possible to display the signal drum shape and the ringing. If IJl-amplitude characteristics) are shown four times, seven is obtained. Since it has a built-in 1&memory tube, it can also display S* images, making it possible to obtain a capable 26111 meter.

This type of waveform display system with a microcomputer inside has already been put into practical use. An example is shown in FIG. In the figure, input terminal 101a is shown.

Input terminal 101 An analog input signal 102, which is a constant signal waiting for a waveform of KL% type, is input. Input terminal 10
The analog input signal 102 input to 1 is a high-speed ^Df*
The ADf conversion output is inputted into the Batzer memory 104.The input buffer memory 104 is, for example, a random access memory c and below 1 (A
M) can be used. Writing to input buffer memory 104 is performed at address MK using an address signal output from write address counter 105.

Write tie signal #: The AD conversion end T signal 106 is given from the iAD converter 103 to the tie ζ puffer signal generation circuit 107, and as a result, the convolution command signal 108 is sent from the tying signal generation circuit 107 to the mesh 104. This is done by being output. 1lltf successive address counter. The address signals of read address counter Ill and write address counter 105 are selected by multiplexer 132 and sent to input buffer memory 17104! Can be seen.

Therefore, during writing, the address signal of the write address counter 06 is applied to the input buffer memory 104, and during reading, the address signal of the read address counter 111 is applied to the input buffer memory 17104K.

The multiplexer 112 is a timing signal generation circuit 107
Switching is controlled by a control signal 109 output from the control signal 109.

113q waveform processing device. This waveform processing 11# position 11
3 is mainly constituted by a microcomputer, and processes the waveform data given from the input buffer memory 104 by fast Fourier f transform processing or N-to-width transform processing as necessary, and stores the processed m* result in memory 114. At the same time, the storage data is transferred to the display device 115. 1
Reference numeral 16 denotes a keyboard p, into which red inputs such as a waveform display command, a tI4m number spectrum display command, a histrum display command, etc. are input from the e-board 136, and the waveform processing unit 113 processes the input data according to the commands.

Input buffer memory IO4> waveform processing ffi equipment 11
The data is transferred to the data fix?3 when the waveform processing J11 device 133 finishes processing the signal. This is performed every time the request signal 117 is output to the tie ζ blowfish signal generation circuit 107. Part 1! The i transmission is performed at a speed sufficiently faster than the ADt' conversion synchronization of the AD converter 303, and all data in the -fK memory IO4 is sent to the waveform processing device 113Klli. When an AD[conversion end T signal 106 is output from the KAD[' conversion 103 during transfer, the transfer operation is interrupted and the ^D conversion result is stored in the memory 104. It operates in such a way that bullet points are given priority.

The display device 115 is a fi+J including a microcomputer.
111111t118! :1. Waveform section 1!61 place 113
The 9 data sent to the computer and character information such as letters and symbols are stored in the refresh memory 19 and the refresh memory 119, and the 9 information stored in the refresh memory 119 is taken out as a clear characteristic on the XY axis, and Y and X axis registers 121 and 122 that temporarily store information, and their registers 121.
122 converts the stored digital value into DA converter 123 and 124, and integrates this DA conversion output and connects the previous given XY beak signal and the next given xy@@ field. It can be composed of a random scan generator 126 that outputs a voltage signal for drawing a line, and a cathode ray tube 126.

With the above configuration, it is possible to display an analog waveform 9 as shown in FIG. 2, an analog hourglass-shaped frequency spectrum as shown in FIG. 3, or a histogram as shown in FIG. 4.

-1 In Fig. 1, 127 is a manual trigger command switch. This manual trigger command switch is
When the trigger command switch 127 is operated, writing to the ΔD converter 103 and the memo I 7104 is interrupted after a predetermined period of time. When writing to the memory 104 is interrupted, the waveform data stored in the memory 104 is repeatedly supplied to the signal processing device 113, and the state 1gI immediately before the trigger operation is changed to 1gI! It can be displayed on the polar ray tube 126 forever.

In contrast to manual trigger mode, automatic trigger mode 1 is provided. In the automatic trigger mode, a trigger signal is output when the analog input signal exceeds a set level, and writing to the memory 104 is automatically stopped using this trigger signal. This automatic triggering code generally
It is used to capture the spirit image. To execute automatic trigger mode, level setting switch 128, digital setting @ 129, and DAf exchange! ! ! 131, 132 and
Voltage comparators 133 and 134 and selection circuit J31S (!-
, a trigger delay counter 138, and an automatic trigger mode setting switch 137 are provided.

By operating the level setting switch 128 one by one), the digital setting 6129 is set to #'fl, for example.

Output digital numerical values like 2.4.8, 1.2.4... This digital value is converted to DA quality*513
DAf is converted to 1.182 and an analog voltage is output. That is, the DAR converter 11k131 outputs a positive analog voltage, and the DAf converter 8182 outputs a prize analog voltage. Voltage comparators 183 and 134 receive analog input signal 1 (l and C
The analog input signal lO2 is compared with the set voltage given from AR1Illi$111.184.
--Outputs a trigger signal when it is turned on. The selection circuit 135 selects whether to apply a trigger using a positive side trigger signal or a negative side trigger signal. This selection can be preset by a setting switch. Selection circuit I
JI! The trigger signal output from $tP is supplied to a trigger delay counter 136. The trigger fist delay counter 136 writes the force value into the memory 104 a set number of times after receiving the trigger signal, so that the force value can be stored in the memory 104 until the end of the transient agglomeration. iru.

In this way, when the analog input signal exceeds a set level, a trigger signal is automatically generated, and the D conversion value is stored in the memory 104 from the time the trigger signal is generated until the set number of times. Make sure to remember the lf soul image 10
4, and the transitional current status can be displayed as shown in the 6th column.

However, the conventional input buffer memory 104 is
It was rare to have enough capacity to display one screen on 26. Therefore, as shown in FIG. 6, the first IK transient signal 601 is generated at time TI, and after that, at time T, when writing has been performed for more than 1W surface of the taiui tube 126,
If the transient filling signal 602 in FIG.

This Jl! The purpose of I#P4 is to capture the 4ff soul image 1, which is input after more than one stroke (3) minutes of the cathode ray tube.
Narrow indication of waveforms etc. that can be captured into memory ii! There is a K who provides books.

In this invention, the input buffer memory 104f) is configured to have a large weighing capacity and to continue writing from the time when a trigger signal is generated until a given number of times of writing has elapsed. Even if the second FEJ trace phenomenon occurs after a time longer than 1 minute of the monopole tube, this second -IR mass phenomenon is stored in the memory. It can be stored.

A practical example of this invention will be discussed in detail below with reference to FIG.

In FIG. 7, parts corresponding to those in FIG. 1 are denoted by the same reference numerals, and redundant explanation thereof will be omitted. However, in this invention, a memory larger than the capacity of the input buffer memory explained in FIG. use Specifically, as shown in Figure 1, the capacity of the nine-person capacity memory B g
x 6 good for 1024 bits. In contrast, the present invention uses a memory of, for example, 8.times.36384 bits. Therefore, in this example, a memory having a capacity 16 times that of the conventional one is used.

In this invention, the address of the sequential address counter 111 is read from the 9th address which is an arbitrary number of addresses away from the write address, and the input capacity from that address is less than the capacity of the buffer memory 104, that is, for example - the polar ray tube]
The waveform processing device 118
The length of the bridge is 111m.

Offset register 701 in this ninth @ Ming
An adder 16702 is provided, and the adder 702 adds the number set in the offset register 701 and the address number of the write address counter 105.

The read address machine printer []]1 is accessed by the addition m.

However, in this invention, the trigger level setting counter 29 is configured so that an arbitrary number can be set from the waveform processing device 118, and the trigger level can be set to any value between positive and negative. Trigger delay counter 1
36!・K, also waveform. 0 to (16
883-1024), and Kfllfl, so that writing to the memory 104 can be stopped after an arbitrary number of convolutions from the time the trigger signal is detected in the automatic trigger mode. It's because of ants.

In this actual example, a #″r long field counter 708 is also provided.

An example will be shown in which the length counter 703 can be used to set data (2) to be transferred from the shift memory 104 (eta) to the waveform processing device (118) at one time.

According to this structure, a certain amount of data can be read out starting from the address which is always minus a predetermined number from the offset register 701 Kt& from the convolution address for the memory IJI04 and transferred to the waveform processing jl*flil13. The length of data to be transferred is defined by the number set in length counter 703.

For example, if you set the length counter 703 to 1024, the data that can be transferred at once is data for 1024 addresses.
In other words, it is necessary to display the lli surface of the anode ray tube 126.
1 data is transferred to the waveform processing device. This situation is shown in FIG. In the figure, ^• is the starting address of the memo 'JI04, and ^1@ and IN are the final addresses. This earlier application address A assesses the final address
During s [163g has 4 addresses. Suppose that the address is now ringing A1... for 1 hour. Assuming that 100 is set in the offset register 701,
The read address is set in the length counter 703 from the address Age- to the beginning of ASS corresponding to address 200, and read out at the address O corresponding to the number of runs. In this example, A, . . . , A3.4 are read.

When the write address increments by one, the read address becomes ＾■
1 to A11*l will be read.

Therefore, according to this 94, by changing the number set in the offset register 701, any data stored at any position on the memory 104 based on the write address can be transferred to the waveform processing device 113. Therefore, in the automatic trigger mode, it is possible to store transient waveforms 801 and 802 in the memory 104 as shown in FIG. When the write address counter 105 stops at address 8III@@ corresponding to the 15000th address from the previous M address at 1 o'clock at the end of this write operation, for example, if the offset register 701KO is set, the read address Counter 1lltff address All
＠*＠〜＾, @＠＠4 are repeatedly output, and the memory 104 is
Address A1@@@@ ~ A1@814K Extract the stored data. The number of AIII (1.~A1., 1 does not have any waveform data in this example, so the offset register 70) is increased by the signal from the shape processing device'=113.The offset register 7010 is set. When the sum of the value and the number of addresses of the write address counter 105 exceeds the value of the final address ^1 entry (■) of the memory 104, the bit that outputs the address code of the adder 702 enters the initial address state.Therefore, the read address counter 113, destination j[I location A is accessed.

Therefore, according to the invention, at which address the d write address counter 105 stops and the offset register T01K
By sequentially setting the numbers O~(16383-1 (14)), all the states of the offset register 9104 can be read out. Setting the numerical value to the offset register 701 can be done using the operation manual provided on the keyboard 116. By manipulating , it is possible to freely refine the curve in either the increasing or decreasing direction.Therefore, it is possible to select the necessary transient phenomenon@-shaped portion and display it.

In addition, according to this invention, the capacity of 104 input buffers is increased, and 4 memories 1 memory are used for long-time convulsive soul waveforms.
04 can be reliably stored.

A must for your waveform! This section can be extracted and displayed on the II#i line tube. Furthermore, in this invention, the amount of data to be sent to the waveform processing device fl1B at one time can be set according to the value set in the length variable 703, so the amount of data to be sent four times can be set to 1! lI pole@'
It is possible to limit the amount of data necessary for displaying 112BK. Therefore, even if the capacity of the memory 104 is increased, the time required to transfer all the data in the memory 104 and its waveform processing will be reduced! ! The time can be kept as usual. Therefore, new data can be transferred to the waveform processing device J3 in a short time, and the display tl- will not be significantly affected by the deterioration of the analog input signal.

Therefore, for example, when using a fixed target as a filter and adjusting its frequency characteristics, Isogo, which deteriorates the display, will not be greatly affected compared to N Toyosou, so 11#1i! I operation can be performed in Yongji4.

In addition, J: In the above, the number of data required to be displayed on the board 126 is set to 1024, and 9 is! Nisa counter 703 5
If you set 12, you can transfer half the normal number of data at once. During that time, if 1024 points of data Kf are exchanged for Vr, then half the time's data t-]1iEl
You can draw it by enlarging it on i. Furthermore, by setting 2048 in the length counter 703, twice the normal number of data can be transferred. If twice this number of data is waveform-processed and converted into data of 1024 points, it is possible to draw data with twice the length.

As described above, according to the present invention, even a crossing border shape that lasts for a relatively long time can be reliably stored in the memory 04.

However, since only the necessary part of the drum shape data can be transferred to the tIjl shape processing device 113, the waveform of the necessary part can be displayed as the 1ili drum frequency spectrum or histogram of that part, which is useful for practical purposes. A measuring device can be obtained advantageously.

[Brief explanation of the drawing]

Figure 1 is a block diagram to clarify the conventional display device such as a drum-shaped display device. is a waveform diagram for explaining the disadvantages of the conventional device, Figure 7 is a block diagram showing an example of the present invention, and Figure 8 is a ninth waveform diagram for explaining the present invention in detail. High speed At)!' changer, 104: Input cut (tsufu')
Memory, 105: Write address counter, 107 *
I ink signal generation circuit, 111: M output address counter, Ji2: w multiplexer, 113: waveform processing device, 114 = memory, 115: display device, 133.1
194 Nitori Garemo output level ratio IK number, 13 fs:
-r multiplexer, 136: trigger delay counter, 701: offset counter, 702: addition IN!
, 703: Length counter. Patent owner: Takeda Ryoken Kogyo Co., Ltd. Kunto Kusano Figure 2
Figure 3 TIME FREQU
ENCY Figure 4 Figure 25 VOLT TIME
E6 Figure 78

Claims (1)

[Claims] O) Analog input signal was converted into ADf, and its ^Dlj converted output was stored in the input buffer memory, and the memory in that memory was subjected to t or secondary processing and transferred to the display memory, and then transferred to the display memory. In a display device such as a drum-shaped display device that converts data from DA to cathode ray tube and displays it on a cathode ray tube, the capacity of the input buffer %17 is
Kl to display the lii side! a trigger detection means for detecting an arbitrary level position of the analog input signal; , and means for stopping writing to the memory at the time when only an arbitrary sampling point is selected after detecting a trigger point by the trigger detection means**.