JPH055752A - Waveform display method in waveform recorder - Google Patents

Abstract

(57) [Summary] [Purpose] To enable a part of the waveform to be displayed preferentially in a real-time recorder without waiting for the end of storage of all waveform data. [Structure] On the CRT, the line cursor is used to specify the portion to be preferentially observed. When the waveform data is sequentially written to the storage memory, when the waveform data is filled up to the address designated by the line cursor, the CPU calculates the waveform data required for one-screen display at that time, and the CRT of the signal waveform. To display.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waveform display method in a waveform recorder, and more particularly to a waveform display method capable of displaying a desired signal waveform as quickly as possible.

[0002]

2. Description of the Related Art In a waveform recorder, an analog input signal is converted into a digital signal by an A / D converter, the digital signal is sequentially written in a storage memory, and after the storage is completed, a predetermined calculation is performed to perform CRT or the like. Is displayed on the display section of.

In practice, the A / D from the control unit (CPU)
A conversion start signal is output to the conversion unit, and the digital signals from the A / D conversion unit are sequentially written in the storage memory.

The CPU monitors the address counter of the A / D converter, performs a predetermined calculation (for example, four arithmetic operations, differentiation, integration, etc.) on all the waveform data after storage, and displays it on a CRT or the like.

[0005]

As described above, conventionally, since the waveform is not displayed until all the storage and calculation are completed, there is a problem that the waiting time is long and the real-time displayability is poor.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional circumstances, and its structural features are: an A / D conversion unit for converting an analog input signal into digital waveform data; A storage memory for storing data, a waveform display section for displaying the signal waveform based on the waveform data in the storage memory, the A / D conversion section,
In a waveform recorder provided with the storage memory and a control unit (CPU) that controls each unit of the waveform display unit, of the waveform data stored in the storage memory, a signal waveform to be displayed on the waveform display unit. When the waveform data converted by the A / D converter is sequentially written in the storage memory, the CPU monitors the write address and has the display address designating unit for designating an address. This is because when the address designated by the display address designating means matches, the waveform data of the corresponding address is calculated and displayed on the waveform display section.

In this case, the address area designated by the display address designating means is preferably one screen worth of data of the waveform display section.

[0008]

According to the above configuration, when the waveform data is sequentially written from the A / D converter to the storage memory, the waveform data is displayed at the address designated by the display address designating means. The necessary waveform data is calculated, and the signal waveform is displayed on the display unit.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a schematic block diagram of this waveform recorder. According to this, the waveform recorder has an A / D conversion unit 1 for converting an analog input signal into a digital signal, a storage memory 2 for storing a digital signal (waveform data) from the A / D conversion unit 1, and A main body memory 3 including a ROM / RAM in which a system program of a recorder is stored, a CPU 4 as a control unit, and a CRT 5 as a display unit for displaying a signal waveform obtained from the waveform data stored in the storage memory 2. Is equipped with.

The CPU 4 controls the conversion operation of the A / D converter 1, the write / read operation of the storage memory 2 and the main body memory 3, the display operation of the CRT 5, and the like.
A display address designating means 6 is connected to the CPU 4.

The display address designating means 6 is a CRT 5 shown in FIG.
The line cursor 7 displayed above is moved to the left and right, and a rotary switch is used in this embodiment.

That is, when the rotary switch is rotated clockwise, the line cursor 7 moves to the right, and when it rotates counterclockwise, it moves to the left.

According to this method, the signal waveform for one screen after the location designated by the line cursor 7 is displayed even before the storage of all the waveform data in the storage memory 2.

Referring to FIG. 2 in which the addresses of the storage memory 2 are schematically illustrated, the CR in FIG. 3 is described.
Assuming that the position of the line cursor 7 on T5 corresponds to the address m of the storage memory 2 and the waveform data for the α address is displayed on one screen of the CRT 5, CP
U4 preferentially displays the waveform data from the address m to the address m + α on the CRT 5 before the end of storage.

The operation will be described with reference to the flowchart of FIG. First, the CPU 4 issues a start signal to the A / D converter 1 to start storage.

As a result, the analog input signal is A / D converted, and its waveform data is sequentially written in the storage memory 2.

During this time, the CPU 4 monitors the address counter of the A / D converter 1 and waits until the waveform data required for priority display is stored. As another example, the write address of the storage memory 2 may be directly monitored.

When the waveform data is written up to the address m + α, the waveform data from the address m to the address m + α required for one screen display is calculated and the signal waveform is preferentially displayed on the CRT 5. The display example is shown in FIG.

After that, the CPU 4 waits for the end of storage at which the writing of the waveform data up to the address n is completed, and then performs the calculation on all the waveform data and displays the signal waveform on the CRT 5.

In the above embodiment, the one screen data after the line cursor 7 is preferentially displayed, but in some cases, the previous one screen data from the line cursor 7 may be preferentially displayed.

[0021]

As described above, according to the present invention, even when a large amount of waveform data is stored and it takes a long time to write the waveform data, it is not necessary to wait until the storage of all the waveform data is completed, and the waveform data to be observed is desired. Can be preferentially displayed in real time.

[Brief description of drawings]

FIG. 1 is a schematic block diagram of a waveform recorder to which the present invention is applied.

FIG. 2 is an explanatory diagram schematically showing addresses of a storage memory.

FIG. 3 is an explanatory diagram showing a state in which a line cursor is used to preferentially display a position on a CRT.

FIG. 4 is a screen view of a CRT showing a priority display screen.

FIG. 5 is a flow chart for explaining the operation of the present invention.

[Explanation of symbols]

 1 A / D converter 2 Storage memory 3 ROM / RAM 4 CPU 5 CRT 6 Display address designating means 7 Line cursor

Claims (1)

Claims: 1. An A / D converter for converting an analog input signal into digital waveform data, a storage memory for storing the waveform data, and a storage memory for storing the waveform data in the storage memory. In a waveform recorder including a waveform display unit for displaying a signal waveform, an A / D conversion unit, the storage memory, and a control unit (CPU) for controlling each unit of the waveform display unit, the waveform is stored in the storage memory. Of the waveform data to be displayed, having display address designating means for designating the address of the signal waveform to be displayed on the waveform display section,
When sequentially writing the waveform data converted by the A / D converter into the storage memory, the CPU
Monitors the write address, and when the write address coincides with the address designated by the display address designating means, calculates the waveform data of the corresponding address and displays it on the waveform display section. A method for displaying a waveform in a waveform recorder, characterized in that 2. The waveform display method in a waveform recorder according to claim 1, wherein the address area designated by the display address designating means is data for one screen of the waveform display section.