JPH05160641A - Arbitrary waveform edition method - Google Patents

Abstract

PURPOSE:To edit an arbitrary waveform in either of the analog form and the digital form. CONSTITUTION:Arbitrary digital data stored in a storage means is displayed on a display means as one of an analog waveform, characters/numbers, or a timing waveform, and digital data is edited by one of the analog waveform, characters/numbers, or the timing waveform displayed on the display means, and edited digital data is displayed as any of the analog waveform, characters/ numbers, and the timing waveform.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waveform editing method for an arbitrary waveform generator capable of outputting an arbitrary analog waveform.

[0002]

2. Description of the Related Art Since an arbitrary waveform generator can generate various arbitrary waveforms desired by an operator, it is very effective for testing various electronic devices. In a conventional arbitrary waveform generator, desired digital data is stored in a digital memory that is a storage means, the digital data is sequentially read, and the digital data is supplied to a digital-analog (D / A) converter.
Generating an analog waveform. To edit the generated analog waveform, draw or modify the analog waveform on the display with various input devices such as a mouse or rotary knob, and store the digital data corresponding to the waveform in the storage means. is doing.

[0003]

By the way, conventionally, when editing an analog waveform to be output, as described above, the analog waveform displayed on the display unit is directly edited even though the waveform data is in the digital format. I didn't know what the corresponding digital data would look like. If the arbitrary waveform generator is provided with a digital output terminal in addition to the analog output terminal to output the analog waveform and the corresponding digital signal, it is more convenient to edit the digital data directly. Often there was.

Therefore, an object of the present invention is to provide an arbitrary waveform editing method capable of editing in both an analog waveform format and a digital format.

[0005]

According to the present invention, an arbitrary waveform used in an arbitrary waveform generator which converts arbitrary digital data stored in a storage means into an analog signal by a digital-analog converter and outputs an arbitrary waveform. This is the editing method. According to the present invention, arbitrary digital data stored in the storage means is displayed on the display means by one of an analog waveform, a character number and a timing waveform, and the analog waveform and the character number displayed on the display means are displayed. And timing waveform 1
Edit digital data by one. Then, the edited digital data can be displayed by any of the analog waveform, the alphanumeric characters and the timing waveform.

[0006]

According to the present invention, the digital data corresponding to the arbitrary waveform is the same regardless of the display format of the analog waveform, the alphanumeric characters and the timing waveform displayed on the display means. But you can easily edit arbitrary waveforms. Further, when outputting a digital signal corresponding to an analog waveform, the editing result of the timing waveform becomes the digital output signal as it is, so that the waveform editing becomes easier.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 2 is a block diagram of an arbitrary waveform generator using the present invention. The address generator 10 is a digital adder that adds the output data of itself and the increment value for each clock, and supplies the output data as an address signal to the address terminal of the waveform memory 12. Also,
The address generator 10 may be a simple counter, and its output signal may be supplied to the waveform memory 12 as an address signal. The waveform memory 12 is, for example, a 12-bit wide random access memory (RAM) and stores digital data corresponding to an arbitrary waveform to be generated. The D / A converter 14 converts the digital data from the waveform memory 14 read by the address signal from the address generator 10 into an analog signal. Output circuit 1
6 is a so-called output buffer, which is a D / A converter 14
The analog output signal from the waveform memory 12 is supplied to the analog output terminal 15, and the 12-bit digital signal from the waveform memory 12 is supplied to the digital output terminal 17.

A central processing unit (CPU) 18, which is a microprocessor, a RAM 20, which is a temporary memory, and a CPU
A read-only memory (ROM) 22 storing programs for 18 and the like is interconnected via a bus 30. The bus 30 is composed of a data bus, an address bus and a control bus. An input device 24 including a keyboard, a rotary knob and a mouse, and a display circuit 26 are also connected to the bus 30. The display circuit 26 processes the display data according to the format of the display 28 and displays the result on the display 28. For example, when the display 28 is a raster scan type cathode ray tube, the display circuit 26
Develops display data in a frame memory, sequentially reads out the frame memory in accordance with raster scanning, and supplies it to the display unit 28. The address generator 10 receives the data corresponding to the oscillation frequency from the bus 30. The waveform memory 12 is a digital memory edited in the RAM 20.
Data is received via bus 30. The waveform memory 12 and the RAM 20 form a storage means.

Next, the arbitrary waveform editing method of the present invention will be described with reference to the flowchart of FIG. Software corresponding to the flowchart shown in FIG. 1 is stored in the ROM 22. First, the operator selects a display mode for editing an arbitrary waveform from the graphic display mode, the table display mode and the timing display mode using the input device 24.
In step 50, the CPU 18 judges what the current display mode is, and if it is the graphic display mode, the step 18
If the table display mode is selected, the process proceeds to step 54. If the timing display mode is selected, the process proceeds to step 56.

In step 52, if the digital data corresponding to the arbitrary waveform to be output is stored in the RAM 20 in advance, the analog waveform corresponding to the digital data is written in the frame memory in the display circuit 26, as shown in FIG.
As shown in FIG. 5, the analog waveform is displayed on the display 28 together with various information. Still digital in RAM20
If no data is stored, no analog waveform is displayed on the display 28. Note that the analog waveform is
To write to the memory, the CPU 18 may perform the function of a vector generator and expand the digital data into an analog waveform. Next, the operator uses the input device 24 to select whether to output the displayed analog waveform as an electric signal (output mode) or to edit (edit mode). Then, the CPU 18 proceeds to step 58 and determines the operator's selection. If the edit mode is selected,
Go to step 64. In step 64, the operator uses the input device 24 to perform an edit operation of drawing or correcting the display waveform, so that the CPU 18 detects the edit state. In step 70, the CPU 18 writes digital data in the RAM or corrects digital data already stored in the RAM, depending on the edited state. After step 70 ends, the process returns to step 52 via step 50 again, so that a new analog waveform is displayed on the display unit 28.

In step 54, if the digital data is stored in the RAM 20 in advance, a table (a table using alphanumeric characters) corresponding to the digital data is written in the frame memory in the display circuit 26, as shown in FIG. As shown in FIG. 5, the table is displayed on the display 28 together with various information. In order to write the table in the frame memory, the CPU 18 makes the letters and numbers as figures,
It may be written in the frame memory or the code of each alphanumeric character forming the table may be written. yet,
If no digital data is stored in RAM 20, no table will be displayed on display 28. It should be noted that the table is displayed in binary notation in FIG. 4 and in decimal notation in FIG. In the case of displaying in decimal system, since the digital data is in binary system, the CPU 18 first has to change the binary system into the decimal system, but the other processing is the same. Step 60
Is the same as step 58. Also, step 66
Is similar to step 64, but the operator
4 is different in that a table is created or modified and editing operation is performed. After step 66, the process returns to step 54 via steps 70 and 50 as described above.

In step 56, if digital data is stored in the RAM 20 in advance, the logic timing waveform corresponding to the digital data is displayed on the display circuit 26.
Write to the frame memory inside, as shown in Figure 6,
The timing waveform is displayed on the display 28 together with various information. If the digital data is not yet stored in the RAM 20, the timing waveform is not displayed on the display 28. To write the timing waveform in the frame memory, the CPU 18 may convert 1 and 0 for each digit of the digital data into a waveform as it is. Step 62 is the same as step 58. Also, step 6
Step 8 is similar to step 64, except that the operator uses the input device 24 to create a timing waveform or makes corrections to perform an editing operation. After step 68, the process returns to step 56 via steps 70 and 50 as described above. It should be noted that the edited digital data is the same data stored in the RAM 20 in any of the graphic display mode, the table display mode and the timing display mode.

If the output mode is selected in steps 58, 60 and 62, the process proceeds to step 72,
The CPU 18 stores the digital data stored in the RAM 20.
The data is transferred to the waveform memory 12 via the bus 30. Further, the data corresponding to the oscillation frequency input by the input device 24 is transferred via the bus 30 to the address generator 1.
0 is supplied. In step 74, waveform memory 1
2 becomes a read mode, and the address generator 10 generates a read address. Therefore, as described above, the edited analog waveform is generated at the analog output terminal 15, and the 12-bit digital signal corresponding to the analog waveform is
It is generated at the digital output terminal 17.

Although the preferred embodiment of the present invention has been described above, various modifications and changes can be made without departing from the gist of the present invention. For example, in table display mode,
In addition to the binary system and the decimal system, the digital data may be displayed in the octal system or the hexadecimal system.

[0015]

As described above, according to the present invention, it is possible to easily edit an arbitrary waveform in any display format of the analog waveform, the numerical characters and the timing waveform displayed on the display means. Further, when outputting a digital signal corresponding to an analog waveform, editing can be further facilitated by using letters and numbers and timing waveforms.

[Brief description of drawings]

FIG. 1 is a flow chart illustrating a preferred embodiment of the present invention.

FIG. 2 is a block diagram of an arbitrary waveform generator using the present invention.

FIG. 3 is a diagram showing a display in a graphic display mode for explaining the present invention.

FIG. 4 is a diagram showing a display in a table display mode for explaining the present invention.

FIG. 5 is a diagram showing a display in a table display mode for explaining the present invention.

FIG. 6 is a diagram showing a display in a timing display mode for explaining the present invention.

[Brief description of symbols] 10 address generator 12 waveform memory 14 D / A converter 16 output circuit 18 CPU 20 RAM 22 ROM 24 input device 26 display circuit 28 display device

Claims (1)

[Claims] 1. An arbitrary digital memory stored in the storage means.
A method for editing an arbitrary waveform of an arbitrary waveform generator which converts data into an analog signal by a digital-analog converter and outputs an arbitrary waveform, wherein the arbitrary digital data stored in the storage means is:
One of the analog waveform, the alphanumeric character and the timing waveform is displayed on the display means, and the digital waveform is displayed by one of the analog waveform, the alphanumeric character and the timing waveform displayed on the display means.
An arbitrary waveform editing method, characterized in that the edited digital data can be displayed by editing the data and displaying any of the analog waveform, the alphanumeric characters and the timing waveform.