JP2570635Y2 - Digital oscilloscope - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waveform observation device such as a digital oscilloscope, and more particularly, to speeding up a process of displaying an observed waveform at the time of operating a screen such as scroll expansion of the observed waveform.

[0002]

2. Description of the Related Art In a digital waveform observation apparatus, a display wave
When scrolling the shape (moving the waveform on the time axis), the waveform
Areas without data as screen ranges are also related to the time axis
May appear in the display screen. This is a picture5To
It is shown.ConventionalProcessing of such a part soft
It was done by wear. First, store the measured waveform data
Valid waveform data as a screen range in the memory
The address where the data is stored is managed by the CPU. Less than
Below, the data in the screen range is used for valid data,
Data is called invalid data. Next, for scroll display
Read data from memory. At this time,
Therefore, the relevant address of the read data is used as valid data.
At the addressAhOr invalid data address.
Display is valid or invalid by display circuit
And performs a process of not displaying data outside the screen range. This
In the case of
It takes time to display the waveform because it is processed beforehand, and the screen is updated
It is difficult to increase the speed. Also, for high-speed processing C
The use of PU makes the equipment expensive.

[0003]

For this reason, there has been a problem that, with an inexpensive and simple configuration, high-speed scroll display cannot be performed, which hinders use in waveform observation. An object of the present invention is to solve such a problem, omit the determination of invalid data by software, and realize a high-speed updating of a waveform display screen by an inexpensive method.

[0004]

SUMMARY OF THE INVENTION A microprocessor is used.
Digital oscilloscope controlled by the control unit
Analog / digital inputting analog measurement signal
Converter and the measurement digitally converted by this converter
A memory for storing data and a signal from the control unit
Display or display prohibition of the measurement data based on
A gate control circuit that outputs a signal and this gate
Read from the memory according to the output signal of the control circuit.
Display or prohibit display of retrieved measurement data
And a gate circuit that outputs
Of the measurement data, display the measurement data
A display circuit that converts the signal into a signal suitable for display and outputs it.
Display measurement data according to the signal output by the display circuit
A display device is provided, and measurement data that does not need to be displayed is displayed on the display screen.
It is characterized in that it does not appear .

[0005]

[Function] When displaying waveform data on the screen, no display is required.
Displayed by the display circuit after the mask by direct hardware to read from the waveform memory with respect to invalid data have
Since the exclusion signal processing is performed, high-speed processing becomes possible.

[0006]

1 shows a basic configuration of the present invention. 1 is a
Analog / digital converter (hereinafter referred to as A / D converter)
The.) Converts the input analog signal to a digital signal
I do. Reference numeral 2 denotes a memory, which is a digital output from the A / D converter 1.
Storing force. 3 is a gate circuit for gate control
Control signal from road 4ByData from memory 2 (D)
Is output to the display circuit 5 or the like. Gate control circuit 4
IsControl unitFrom CPU7 Which address in memory 2
TheIn factReading orThatIf the data is in the display range
Whether or notReceiving the signalControl signalToGate circuit
Output to 3. 5 is a display circuitIsFrom the gate circuit 3
OutputConvert to display data.At this time, the gate circuit 3
Their output isDisplay-freeDo not display if it is data
Sea urchinYouYou. 6 is a peripheral circuitYes, ROM and RAM auxiliary
There is memory. Output data from the gate circuit 3 is also temporarily stored.
To allow the display device 8 to observe the waveform.
7 is a CPU, that is, a control unit.Yes,ROM, RAM
Specify the read address from the memory together with the gate
The control of the troll circuit 4 and the display circuit 5 is performed.8 is a table
Display deviceYes, The output from the display circuit 5 is displayed. What
A specific example of the gate circuit 3 is an OR circuit as shown in FIG.
It consists of circuits arranged in parallel for the number of bits.

The overall operation flow will be described. FIG.
In, the measurement input signal is digitally converted by the A / D converter 1 and stored in the memory 2, and the stored measurement data is input to the peripheral circuit 6 or the display circuit 5 via the gate circuit 3. In the above explanation,
Although masked through preparative circuit 3, a memory 2 address
It is also possible to access by masking the address . At this time The data that does not need to be displayed may be stored at the address to be masked. In this way, the effective
To read data, the data must be read through the gate circuit 3 or
Directly specify the address of the data to be displayed or two
There is a law.

The mask will be described. As described above, the gate control circuit 4 outputs a control signal for masking data in a predetermined address section under the control of the CPU 7. Here, the mask is to output a predetermined value instead of the measurement data.
In the case of bit data, FFH is output as mask data. The CPU 7 performs address management for masking the measurement data. That is, an address for storing measurement data during normal observation (a state in which scrolling or the like is not performed) is set in advance. Further, a display is provided for the gate control circuit 4 .
Specify the address section where unnecessary measurement data is stored
You. In response to this, the gate control circuit 4 sets the gate times.
A mask signal is sent to the path 3.

[0009] Data for gate control circuit 4
TomaskDoSetting of the address section is displayed on the screen
Measurement dataValid dataSetting of address section of
It can also be performed by using a value.
The operation at the time of scrolling will be specifically described.On the display screen
When scrolling the waveform Displays valid data on the screenTo
DisplayPositionI will shift it.For this reason,Shift display
The valid data address must be reset every time
No.At this time, The valid data address section is
Can be used directly as a masking address.
Also anotherofAs a method, the address section of the data maskof
Settings andIsIt is also possible to do it separately. Therefore, the screen table
ShowdoEffective data address management and maskDodata
Address management andone timeToYou can do it.

The peripheral circuit 6 is a peripheral circuit related to the operation of the CPU 7, and is composed of a ROM, a RAM and the like. The measurement data can observations electrical signal on the display device 8 which is input to the display circuit 5. A specific circuit of one embodiment of the gate circuit 3 shown in FIG. 2 will be described. Gate circuit 3
OR circuits are provided for all output circuits for constant data,
The H-level signal output from the control circuit 4 is
Input to all OR circuits. This allows the measurement
The gate circuit 3 temporarily converts the data to H level data.
Output from The display circuit 5 measures the H level.
Filter data as invalid data and remove it from the display.

The operation in such a configuration will be described. FIG. 3 is a time chart showing the relationship between the input / output relationship of the gate circuit 3 and the gate control circuit 4.
(A) is the address of the data in the memory 2 output from the CPU 7, (B) is the masked data, and (C) is the control signal output from the gate control circuit 4, which is at H level. In the case of, display is prohibited . (D) is measurement data output from the memory 2. Using FIG.
First, the principle of processing data that is not displayed among the measurement data will be described. Gate control circuit 4 is CP
By the command from U7, the specified address of the measurement data
Control signal to mask the data in the data section
(C) is generated. By this control signal (C)
Set each bit of the measurement data in the address section to H level
And output from the gate circuit. Mask data (B)
The address A _K to A _N data read from D _K to D _K or less
This indicates that outside data has been set to the H level. Each de
If the data is 8-bit data, it becomes FFH (255).
Indicates that This is said to be masked. This ma
The screened data is displayed when input to the display circuit 5.
Is processed as unprocessed data. In the figure, enable
The area displays the data of the control signal
Sections and disabled areas are sections where data is not displayed
Point to.

Since there are data of a portion displayed when scrolled and a portion not displayed, the operation at this time will be described. Whether the address A _K to A _N in the normal waveform display
Contact et read Dasa data D _K ~D _N is on display starting point of the screen
Data, and only this data is valid data.
It is displayed. When scrolling the display waveform, the data outside the both ends of the display waveform ,
The data of the part specified in the range is not displayed. When the observation waveform is scrolled (moved in the time axis direction) , the measurement data equivalent to the display prohibited range is displayed on the screen.
The data will be displayed on the screen, but data that does not need to be displayed
When all bits are set to H level,
Outside of the waveform data D _K to D _N so would exclude at示回path
Area data does not appear on the screen.

As described above, since the address or data is not calculated by software, the speed can be increased. Accordingly, the relationship between the display (the position of the data corresponding to the scan) and the enable signal is as shown in FIGS. FIG. 4 shows a normal state, and FIG. 5 shows a state in which scroll display is performed.

[0014]

[Effects of the Invention] As described in detail above, according to the present invention, the screen is updated at high speed during scroll display,
A digital oscilloscope that masks data outside the display range can be realized.

[Brief description of the drawings]

FIG. 1 is a basic configuration diagram of the present invention.

FIG. 2 is a circuit diagram of a main part of the present invention.

FIG. 3 is a time chart showing the operation of the present invention.

FIG. 4 is a diagram showing a display of the present invention.

FIG. 5 is a diagram showing a display of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 A / D converter 2 Memory 3 Gate circuit 4 Gate control circuit 5 Display circuit 6 Peripheral circuit 7 CPU 8 Display device

Claims (1)

(57) [Scope of request for utility model registration] 1. A control unit using a microprocessor.
Analog on controlled digital oscilloscopes
An analog / digital converter for inputting measurement signals and this
Stores measurement data digitally converted by the converter
The measurement based on a signal from a memory and the control unit
A gate that outputs a display or display prohibition signal for data
Gate control circuit and this gate control circuit
Measurement data read from the memory according to the output signal of
A game that outputs data with the distinction of display or display prohibition
Circuit and the measurement data output by this gate circuit.
Signals suitable for displaying measurement data with display distinction
And a display circuit that converts the
Display device that displays measurement data according to the
To prevent measurement data that does not need to be displayed from appearing on the display screen.
A digital oscilloscope characterized by: