JP2631788B2 - Arbitrary waveform and arbitrary data editing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art An arbitrary waveform generator can generate various arbitrary waveforms desired by an operator, and thus is very effective for testing various electronic devices. In a conventional arbitrary waveform generator, desired digital data is stored in a digital memory as storage means, and the digital data is sequentially read out and supplied to a digital-to-analog (D / A) converter.
An analog waveform is being generated. In order to edit the analog waveform to be generated, the analog data is drawn or corrected on the display by various input devices such as a mouse and a rotary knob, and the digital data corresponding to the waveform is stored in the storage means. doing.

[0003]

By the way, conventionally, when editing an analog waveform to be output, as described above, the analog waveform displayed on a display is directly edited even though the waveform data is in a digital format. I did not know what the corresponding digital data was. When an arbitrary waveform generator is provided with a digital output terminal in addition to an analog output terminal to output an analog waveform and a corresponding digital signal, it is more convenient to directly edit digital data. There was often.

Accordingly, an object of the present invention relates to a method for editing an arbitrary waveform and arbitrary data which can be edited in either an analog waveform format or a digital format.

[0005]

According to the present invention, any digital data stored in a storage means is converted into an analog signal by a digital-to-analog converter to output an arbitrary waveform, or An arbitrary waveform for outputting data and an arbitrary waveform and arbitrary data editing method of a digital data generator. According to the present invention, any digital data stored in the storage means is displayed on the display means in any one of an analog waveform display, a character and numeric display, and a timing waveform display. The digital data is edited in any of the display states of the analog waveform display, the character / numerical display, and the timing waveform display displayed on the means, and any one of the analog waveform display, the character / numeric display, and the timing waveform is displayed. It is characterized in that edited digital data can be displayed depending on the display state.

[0006]

According to the present invention, digital data corresponding to an arbitrary waveform is the same regardless of the display format of the analog waveform, character, numeral and 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 a digital output signal as it is, so that waveform editing is further facilitated.

[0007]

Preferred embodiments 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 its own output data and increment value for each clock, and supplies the output data to the address terminal of the waveform memory 12 as an address signal. Also,
The address generator 10 may be constituted by a simple counter, and the output signal may be supplied to the waveform memory 12 as an address signal. The waveform memory 12 is, for example, a random access memory (RAM) having a width of 12 bits, and stores digital data corresponding to an arbitrary waveform to be generated. The D / A converter 14 converts digital data read from the waveform memory 14 according to the address signal from the address generator 10 into an analog signal. Output circuit 1
Reference numeral 6 denotes a so-called output buffer, which is a D / A converter 14.
Is supplied to an analog output terminal 15 and a 12-bit digital signal from the waveform memory 12 is supplied to a digital output terminal 17.

A central processing unit (CPU) 18 as a microprocessor, a RAM 20 as a temporary memory, and a CPU
A read-only memory (ROM) 22 that stores a program for 18 is interconnected via a bus 30. The bus 30 includes a data bus, an address bus, and a control bus. An input device 24 including a keyboard, a rotary knob, a mouse, and the like, 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 device 28 is a raster scanning cathode ray tube, the display circuit 26
Develops the display data in a frame memory, sequentially reads out the frame memory in accordance with the raster scanning, and supplies it to the display 28. The address generator 10 receives data corresponding to the oscillation frequency from the bus 30. The waveform memory 12 stores the digital data edited in the RAM 20.
Data is received via bus 30. These waveform memory 12 and RAM 20 constitute storage means.

Next, an arbitrary waveform editing method according to the present invention will be described with reference to the flowchart of FIG. The 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 determines what the current display mode is, and if it is a graphic display mode, the CPU 18 proceeds to step 52.
If the mode is the table display mode, the process proceeds to step 54; if the mode is the timing display mode, the process proceeds to step 56.

In step 52, if digital data corresponding to the arbitrary waveform to be output is stored in the RAM 20 in advance, an analog waveform corresponding to the digital data is written to the frame memory in the display circuit 26, and FIG.
As shown in (1), the analog waveform is displayed on the display 28 together with various information. Digital still in RAM20
If no data is stored, the display 28 does not display an analog waveform. Note that the analog waveform is
To write the data into the memory, the CPU 18 may perform the function of a vector generator and develop 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 judges the selection of the operator. If edit mode is selected,
Proceed to step 64. In this step 64, the operator performs an editing operation for drawing or correcting a display waveform using the input device 24, and the CPU 18 detects the editing state. In step 70, the CPU 18 stores the digital data in the RAM or modifies the digital data already stored in the RAM according to the editing state. After the step 70 is completed, the process returns to the step 52 via the step 50, so that a new analog waveform is displayed on the display 28.

In step 54, if digital data is stored in the RAM 20 in advance, a table (a table of characters and numbers) corresponding to the digital data is written to the frame memory in the display circuit 26, and FIG. As shown in FIG. 5, the table is displayed on the display 28 together with various information. In order to write the table into the frame memory, the CPU 18 converts the character and numeral into a graphic.
The code may be written in the frame memory, or the code of each character and number constituting the table may be written. yet,
If no digital data is stored in the RAM 20, no table is displayed on the display 28. In the table, digital data is displayed in binary notation in the case of FIG. 4, and decimal data is displayed in the case of FIG. In the case of displaying in the decimal system, since the digital data is in the binary system, the CPU 18 must first change the binary system to the decimal system, but other processes are the same. Step 60
Is the same as step 58. Step 66
Is similar to step 64, except that the operator
4 in that an editing operation is performed after a table is created or corrected. 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, a logic timing waveform corresponding to the digital data is displayed on the display circuit 26.
Write to the frame memory inside, as shown in FIG.
The timing waveform is displayed on the display 28 together with various information. If the digital data has not been stored in the RAM 20, the display 28 does not display the timing waveform. In order to write the timing waveform into the frame memory, the CPU 18 may directly convert 1 and 0 of each digit of the digital data into a waveform. Step 62 is the same as step 58. Step 6
8 is similar to step 64, except that the operator creates or corrects a timing waveform using the input device 24 and performs an editing operation. After step 68, the process returns to step 56 via steps 70 and 50 as described above. Note that the digital data to be edited 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, data corresponding to the oscillation frequency input from the input device 24 is transmitted via the bus 30 to the address generator 1.
0 is supplied. In step 74, the waveform memory 1
2 is in 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
Generated at the digital output terminal 17.

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

[0015]

As described above, according to the present invention, an arbitrary waveform can be easily edited in any of the display formats of the analog waveform, the character numbers and the timing waveform displayed on the display means. When a digital signal corresponding to an analog waveform is output, editing can be performed more easily by using letters, numbers and timing waveforms.

[Brief description of the drawings]

FIG. 1 is a flowchart 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 reference numerals]

 Reference Signs List 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

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code Reference number in the agency FI Technical display location G10H 7/00 521Z

Claims (1)

(57) [Claims] 1. An arbitrary digital data stored in a storage means.
A method for converting arbitrary data into an analog signal by a digital / analog converter and outputting an arbitrary waveform, or an arbitrary waveform for outputting the arbitrary digital data and an arbitrary waveform and arbitrary data editing method of a digital data generator. The arbitrary digital data stored in the storage means,
Displaying on the display means in any one of an analog waveform display, a character and numeral display and a timing waveform display, and displaying the analog waveform display, the character and numeral display and the timing waveform display displayed on the display means Editing the digital data in any one of the display states, and displaying the edited digital data in any of the display states of the analog waveform display, the character / numeric display, and the timing waveform. Arbitrary waveform and arbitrary data editing method.