JPH06324083A - Waveform storage and display device - Google Patents

Abstract

PURPOSE:To realize the increase in number of display points in waveform 1 display and the high speed in waveform updating. CONSTITUTION:A wavefor memory 1 can store the waveform data for at least one measurement. A video memory 2 has a plurality of dual-port memories, which have the addresses corresponding to the dot positions on the display screens. Specified data are written into the addresses, which are determined in response to the data read out of the waveform memory 1 and can be read out at appropriate timing. A display device 3 displays the contents of the video memory 2 on the screen. Furthermore, a control means 4 having the following functions are provided. The waveform data, which are read out of the waveform memory 1, are converted into the addresses when the video memory 2 is accessed. Control is performed so that the contents of a plurality of the dual- port memories 2a and 2b are displayed on the same screen of the display device in the overlapped pattern. When the data are already stored in the dual-port memories 2a and 2b, the contents are cleared once, and thereafter writing is performed based on the waveform data in the continuous measurement in a plurality of times.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waveform accumulating / displaying device for accumulating and displaying waveforms, and more particularly to improvements for improving the effect of accumulating displayed waveforms at low cost.

[0002]

2. Description of the Related Art For example, the following waveform display system is available as a waveform display system for observing the time change of a measured waveform. There is an apparatus that has a plurality of waveform memories and that measures and displays by a method that can be called a slide method. This is to prepare a plurality of (m) waveform memories for storing the waveform data obtained by one measurement, and the waveform data of the first measurement is the first
It is assumed that the second waveform data is sequentially stored in the second waveform memory, and the second waveform data is stored in the second waveform memory. Then, every time n (where n ≦ m) measurements are performed, the contents of n waveform memories are displayed. For example, when the measurement is performed from the first time to the nth time, the contents of the n waveform memories from the 1st to the nth are simultaneously displayed on one screen. Next, when the (n + 1) th measurement is completed, the contents of the second to n + 1th waveform memories are newly displayed on the screen by sliding one (the display is an updated display). Thereafter, the measurement and display are repeated in the same manner, and the accumulated display is performed.

Further, instead of such a slide system, there is also a system of simply displaying every n times. That is, when the first to nth measurements are completed,
Data of n waveform memories (1st to nth) is displayed on one screen. Next, when the measurement is performed from the (n + 1) th time to the 2nth time, that much, that is, the contents of the n + 1th to 2nth waveform memories are displayed (updated display). The same operation is repeated thereafter.

[0004]

However, in any of the above methods, n waveform memories are required, and even if n waveform memories can be collectively displayed, n waveform memories can be displayed.
Since the individual waveform memories are accessed and displayed one by one, there is a problem that the waveform display takes time and the waveform update is slow. In particular, since the display operation is performed every n times of measurement in the method (2), the waveform updating operation seems to be slower than that in the method (3).

SUMMARY OF THE INVENTION An object of the present invention is to provide a waveform storage / display apparatus which has been made in view of the above points and has realized an increase in the number of display points in the waveform display and a faster waveform update.

[0006]

In order to achieve such an object, the present invention has a waveform memory capable of storing waveform data for at least one measurement and an address corresponding to a dot position on a display screen. A predetermined number of dual port memories capable of writing predetermined data to an address determined corresponding to the data read from the waveform memory and reading the data at an appropriate timing; A display device for displaying the contents of the memory on the screen, a function for converting the waveform data read from the waveform memory into an address for accessing the video memory, and the contents of a plurality of dual port memories on the same screen of the display device. The function to control so that it is displayed on top of the dual port memory, if data is already stored in the dual port memory Based on the waveform data in the plurality of successive measurements after clearing the degrees contents, characterized by comprising a control means having a function of controlling so as to be written.

[0007]

Operation: A plurality of dual port memories having addresses corresponding to the dot positions on the display screen are prepared, and the measured waveform data equivalent are recorded and displayed on the CRT. The measured waveform data is temporarily stored in the waveform memory as in the conventional method, but the past data is not left and updated for each measurement. The control means obtains an address for the dual port memory from the captured measured waveform data and writes a predetermined value (data indicating a display dot) therein. Furthermore, the waveform data is continuously written n times to one dual port memory. The erase operation is repeated for each dual port memory, and the write operation is repeated. With such a configuration, the number of accumulated display dots can be easily increased, and the speed of waveform update can be increased.

[0008]

The present invention will be described in detail below with reference to the drawings.
FIG. 1 is a configuration diagram of a main part showing an embodiment of a waveform accumulation display device according to the present invention. In the figure, 1 is a waveform memory, 2 is a video memory, 3 is a display device, and 4 is a control means having functions such as control of various parts and data conversion.

The waveform memory 1 stores measured waveform data. It should be noted that the processing at the time of measurement performed before storing and the configuration related thereto are not directly related to the present invention, and therefore will be omitted here. The video memory 2 is a display device 3
It is composed of standard dual port memories 2a and 2b having addresses corresponding to pixel positions (also referred to as display dot positions or dot coordinates) on the screen. The address is given by the control means 4. Further, the address for reading the data from the waveform memory 1 is also output from the control means 4. The display device 3 has a display screen formed by a CRT or the like, and can display the contents of the video memory 2.

The control means has an address generating function for accessing the waveform memory 1, an address converting function for converting the waveform data read from the waveform memory 1 into an address given to the video memory 2, and a predetermined data to the video memory 2. It has a function of writing (writing data of "1", for example, to a specified address), writing to the video memory 2, and various control functions for reading the content of the video memory 2 and displaying it on the display device 3. . The number and speed of switching of the dual port memories 2a and 2b (so-called plane switching) can be designated, and programming is possible. A microprocessor unit (MPU) is usually used as the control means having such a function.

The operation of such a configuration will be described below. In the present invention, two dual port memories 2a and 2b are used.
The contents of are superimposed on one screen and displayed simultaneously. However, writing to the dual port memory is only possible with memory 2.
a, memory 2b, memory 2a ,. ． ． And so on. Moreover, continuous measurement waveforms for n times are stored in one dual port memory. This will be described in more detail below.

FIG. 2 is an operation flow showing the writing of data to the memory, and FIG. 3 is an explanatory diagram for explaining the number of display dots. The operation will be described below step by step. (1) Store the measured data in the waveform memory 1. It is assumed that the measurement data of 1000 points is stored in the waveform memory 1 by one measurement. (2) The control means 4 sequentially reads out the measurement data (waveform data) at these 1000 points, and each time the data is read out, the waveform data is converted in a predetermined relationship to obtain an address for the dual port memory 2. This predetermined relationship is determined by the relationship between the waveform data (coordinates) and the coordinates on the display screen, and the relationship between the coordinates on the display screen and the address. When the address is obtained, the data (meaning dot display, for example, a value of "1") is written to the address of the selected one of the dual port memories 2a. (3) The operations of (1) and (2) above are repeated a predetermined number of times (n times). By the above operation, as shown in the period T1 of FIG. 3, 1000 × n dots are finally displayed on the screen of the display device 3 (however, the display dots may overlap, and the same applies hereinafter).

(4) Next, the other dual port memory 2
For b, the same operations as (1) and (2) above are repeated n times. As a result, the number of display dots on the display screen increases as shown in the period T2 of FIG.
It becomes 0 × n dots.

(5) Clear the dual port memory 2a. That is, under the control of the control means 4, all the contents of the dual port memory 2a are rewritten to "0". As a result, the number of display dots is limited to that of the dual port memory 2b, and is 1 at the end of the period T2 as shown in FIG.
000 × n dots.

(6) The above operations (1) and (2) are repeated n times for the dual port memory 2a. As a result, the number of display dots increases, and as shown in period T3 of FIG.
Reach 000 × n dots.

(7) Clear the dual port memory 2b. That is, "0" is written by the control means 4. As a result, the number of display dots becomes 1000 × n as shown at the end of the period T3 in FIG.

(8) The same operations as (1) and (2) above are repeated n times for the dual port memory 2b. As a result, the display dot becomes 20 again as shown in the period T4 of FIG.
Increase to 00xn dots.

After that, the same operation is repeated, but as is apparent from FIG. 3, the display dot number is always 1000 × n dot to 2000 ×, although it is updated by 1000 × n dot in the steady state. It is within the range of n dots, and it can be seen that the number of display dots is increasing. Figure 4
Is a display example of a case where a sine wave whose phase is changed is captured and displayed in the waveform accumulation display device of the present invention.

Although the number of dual port memories is two in the embodiment, the present invention is not limited to this and three or more dual port memories can be used. Of course, if the number of dual port memories is increased, the number of display dots will also increase. Further, the data to be stored in the dual port memory may be not only the presence / absence of dot display but also data including attributes such as display color (effective when color display is possible) and brightness.

In this way, it is possible to easily increase the number of display dots in the accumulated display of waveforms. Further, since the waveform is displayed as soon as it is written in the dual port memory, the waveform is renewed much faster than the conventional method of displaying every n times storage.

[0021]

As described above, according to the present invention, the waveform memory is kept to a necessary minimum, at least two video memories each of which is a dual port memory are provided, and the writing and clearing timings are shifted respectively, so that the number of display points is increased. And the speed of waveform update can be increased. Further, it is possible to suppress a sudden change in the number of display data.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of a waveform accumulation display device according to the present invention.

FIG. 2 is a flowchart for explaining the operation.

FIG. 3 is a diagram for explaining the number of display dots.

FIG. 4 is a diagram showing an example of accumulated display.

[Explanation of symbols]

 1 waveform memory 2 video memory 2a, 2b dual port memory 3 display device 4 control means

Claims (1)

[Claims] 1. A device for temporarily storing digitized measured waveform data in a memory, reading the waveform data, performing appropriate processing and displaying the result on a display device, and storing the waveform data for at least one measurement. Waveform memory and an address corresponding to the dot position on the display screen. Predetermined data is written at the address determined corresponding to the data read from the waveform memory, and at an appropriate timing. A video memory having a plurality of dual port memories that can also be read by, a display device that displays the contents of the video memory on the screen, and the waveform data read from the waveform memory as an address when accessing the video memory. Conversion function, control so that the contents of multiple dual-port memories are displayed on the same screen of the display device And a control means having a function of controlling to perform writing based on waveform data in a plurality of continuous measurements after clearing the contents once the data is already stored in the dual port memory. A waveform accumulation display device characterized by the above.