CN114325025B

CN114325025B - Display control device and method for digital oscilloscope and digital oscilloscope

Info

Publication number: CN114325025B
Application number: CN202210253864.9A
Authority: CN
Inventors: 王永添; 陈报; 郑文明
Original assignee: Shenzhen Siglent Technologies Co Ltd
Current assignee: Shenzhen Siglent Technologies Co Ltd
Priority date: 2022-03-16
Filing date: 2022-03-16
Publication date: 2022-06-21
Anticipated expiration: 2042-03-16
Also published as: CN114325025A

Abstract

The application discloses a display control device and method for a digital oscilloscope and the digital oscilloscope. The first waveform signal comprises a sampling point and an interpolation point, the sampling point is displayed in a preset first display mode, the interpolation point is displayed in a preset second display mode, and the first display mode is different from the second display mode. Because the sampling point and the interpolation point in the first waveform signal are displayed in different display modes, the digital oscilloscope can quickly acquire the real sampling point value obtained according to the sampling data when the digital oscilloscope reads the waveform data, and the reliability of the waveform reading data is further improved.

Description

Display control device and method for digital oscilloscope and digital oscilloscope

Technical Field

The invention relates to the technical field of digital oscilloscopes, in particular to a display control device and method for a digital oscilloscope and the digital oscilloscope.

Background

The digital oscilloscope is an indispensable tool for designing, manufacturing and maintaining electronic equipment, the digital oscilloscope is mainly used at present, the digital oscilloscope is increasingly popularized due to functions of waveform triggering, storing, displaying, measuring, analyzing and the like, and the digital oscilloscope is considered as eyes of engineers as the scientific and market demands are rapidly developed, and the digital oscilloscope is used as a necessary tool for meeting measurement challenges of the engineers. Particularly, in the development process of electronic circuits, an oscilloscope is required to be frequently used for debugging and measuring, the measurement precision is higher and higher, and the performance requirement on the oscilloscope is higher and higher.

The digital oscilloscope realizes sampling, mapping and displaying of signal data through a memory, a control processing device (central processing unit (CPU)), a programmable logic device and external devices thereof. The digital oscilloscope generally comprises a sampling module, a data preprocessing module, an acquisition control module, a data processing unit, a data mapping unit, a display control device and a display screen; the sampling module samples signal data, the sampled data is input into the data preprocessing module to perform delay adjustment between analog signal data and digital signal data, the signal data is acquired and stored through the acquisition control module, the data processing unit processes the acquired signal data of each channel, the processed data signals are mapped into two-dimensional waveform data by the data mapping unit and stored into the external memory (QDR), the data in the external memory (QDR) is converted into RGB graphic data by the color conversion unit, then the waveform data and data such as screen grids and menus generated by the CPU are merged by the display control device and finally displayed on the display screen. The core working principle of the digital oscilloscope is that after analog signals are sampled and processed by an ADC, the waveforms of the analog signals are displayed by a display device. In the practical application of the digital oscilloscope, when the digital oscilloscope is in a small time base, particularly an interpolation time base, the digital oscilloscope usually interpolates between two points in a waveform to be displayed in order to improve the triggering precision, only an original sampling point really corresponds to a value of a really acquired electric signal, and a value calibrated by the interpolation point depends on an interpolation algorithm and is not a value of the actually acquired electric signal.

In the practical use process of the digital oscilloscope, when the calibration value of a certain point on the displayed waveform is confirmed, whether the calibration value is obtained according to the value of an original sampling point or the value of an interpolation point cannot be confirmed, and obviously, only the calibration value obtained according to the value of the original sampling point is the most reliable and accurate. Therefore, it is particularly important to identify whether any point on the waveform displayed by the digital oscilloscope is an original sampling point or an interpolation point.

Disclosure of Invention

The invention mainly solves the technical problem of how to identify whether any point on the waveform displayed by the digital oscilloscope is an original sampling point or an interpolation point.

According to a first aspect, there is provided in an embodiment a digital oscilloscope, comprising:

the attenuation network is used for carrying out attenuation processing on the signal to be processed input into the digital oscilloscope so as to output a first adjusting signal;

the adjustable gain amplifier is used for amplifying the first adjusting signal;

the analog-to-digital converter is used for performing analog-to-digital conversion on the amplified first adjusting signal so as to output a digital waveform signal;

a display device for displaying;

a control processing device including a display control device; the display control device is used for acquiring the digital waveform data according to the digital waveform signal, then performing precision adjustment on the acquired digital waveform data, and sending the digital waveform data after precision adjustment to the display equipment so as to control the display result of the display equipment;

the display device is used for displaying the first waveform signal according to the digital waveform data;

the control processing device further comprises an offset encoding unit, wherein the offset encoding unit is used for sequentially setting a first configuration value corresponding to each line of display pixels in the first waveform signal and changing offset encoding corresponding to a plurality of lines of display pixels in the first waveform signal by using the first configuration value; the offset coding unit is further configured to output the changed offset code when it is determined that the configuration code is changed due to the currently set first configuration value;

the digital-to-analog converter is used for converting the changed bias codes into analog signals;

the bias adjusting circuit is used for receiving the bias code of the analog signal and outputting an analog bias voltage signal according to the bias code;

the impedance transformation network is used for carrying out signal superposition on the first adjusting signal and the analog bias voltage signal so as to obtain a second adjusting signal; the adjustable gain amplifier is also used for amplifying the second adjusting signal; the analog-to-digital converter is further configured to perform analog-to-digital conversion on the amplified second adjustment signal to output the offset-adjusted digital waveform signal.

According to a second aspect, there is provided in one embodiment a display control apparatus for a digital oscilloscope, the digital oscilloscope having a display device;

the display control device is connected with the display equipment and used for sending digital waveform data to the display equipment so as to control the display result of the display equipment; the digital waveform data comprises original sampling data and interpolation data, and the original sampling data is subjected to interpolation transformation to obtain interpolation data;

the display device is used for displaying a first waveform signal according to the digital waveform data; the first waveform signal comprises sampling points and interpolation points, wherein the sampling points are data points obtained based on the original sampling data, and the interpolation points are data points obtained based on the interpolation data;

in the first waveform signal, the sampling points are displayed in a preset first display mode, and the interpolation points are displayed in a preset second display mode; the first display mode is different from the second display mode.

In one embodiment, the display control means includes interpolation processing means;

the interpolation processing device is used for acquiring an original point sequence according to the original sampling data and carrying out interpolation transformation on the original point sequence to obtain an interpolation result sequence;

the interpolation processing device is also used for obtaining an original point annotation sequence according to the interpolation result sequence; the original point labeling sequence is used for labeling the position information of the elements in the original point sequence in the interpolation result sequence;

the interpolation processing means is further configured to take the interpolation result sequence and the original point mark sequence as the digital waveform data.

In one embodiment, the display control device further comprises a data search device;

the data searching device is used for intercepting a single-frame display sequence in the interpolation result sequence; the single-frame display sequence is used for displaying digital waveform data of one frame of the first waveform signal as the display equipment;

the data searching device is used for acquiring the single-frame labeling sequence according to the original point labeling sequence; the single-frame labeling sequence is used for the position information of the element containing the original point in the interpolation result sequence in the single-frame display sequence;

the data searching device is used for sending the acquired single-frame display sequence and the single-frame marking sequence as the digital waveform data to the display equipment so as to be used for the display equipment to display a first waveform signal of a frame.

In one embodiment, the display control apparatus further includes a first storage area, a second storage area, and a third storage area;

the first storage area is used for storing the interpolation result sequence, the second storage area is used for storing the original point marking sequence, and the third storage area is used for storing the single-frame display sequence;

and the data searching device acquires the single-frame marking sequence according to the original point marking sequence stored in the second storage area and the single-frame display sequence stored in the third storage area.

In one embodiment, the interpolation result sequence is equal to the original point annotation sequence in length;

and/or the value of the element used for marking the position of the original point in the original point marking sequence is a first preset value.

In one embodiment, the first display mode includes color display, shape display and/or shading display;

the second display mode comprises color display, shape display and/or shading display.

According to a third aspect, there is provided in one embodiment a display control method for a digital oscilloscope, comprising:

acquiring original sampling data;

acquiring digital waveform data according to the original sampling data; the digital waveform data comprises the raw sample data and interpolated data; the interpolation data is obtained by interpolation conversion of the original sampling data;

driving a display device to display a first waveform signal according to the digital waveform data; wherein the first waveform signal includes a sampling point and an interpolation point, the sampling point is a data point obtained based on the original sampling data, and the interpolation point is a data point obtained based on the interpolation data; in the displayed first waveform signal, the sampling point is displayed in a preset first display mode, and the interpolation point is displayed in a preset second display mode; the first display mode is different from the second display mode.

In one embodiment, the driving the display device to display the first waveform signal according to the digital waveform data includes:

acquiring an original point sequence according to the original sampling data, and performing interpolation transformation on the original point sequence to acquire an interpolation result sequence;

acquiring an original point marking sequence according to the interpolation result sequence; the original point labeling sequence is used for labeling the position information of the elements in the original point sequence in the interpolation result sequence;

and taking the interpolation result sequence and the original point mark sequence as the digital waveform data.

According to a fourth aspect, an embodiment provides a computer-readable storage medium containing a program executable by a processor to implement the display control method according to the third aspect.

The display control apparatus according to the above embodiment is configured to send the digital waveform data to the display device of the digital oscilloscope to control a display result of the display device, and the display device displays the first waveform signal according to the digital waveform data. The first waveform signal comprises a sampling point and an interpolation point, the sampling point is displayed in a preset first display mode, the interpolation point is displayed in a preset second display mode, and the first display mode is different from the second display mode. Because the sampling point and the interpolation point in the first waveform signal are displayed in different display modes, the digital oscilloscope can quickly acquire the real sampling point value obtained according to the sampling data when the digital oscilloscope reads the waveform data, and the reliability of the waveform reading data is further improved.

Drawings

FIG. 1 is a schematic diagram of a digital oscilloscope;

FIG. 2 is a schematic diagram of a display control apparatus according to an embodiment;

FIG. 3 is a timing diagram of digital signals of a digital oscilloscope in one embodiment;

FIG. 4 is a schematic view of a display principle of a display device in one embodiment;

FIG. 5 is a schematic diagram illustrating a display manner of a square mark according to an embodiment;

FIG. 6 is a schematic diagram illustrating a display manner of a circular mark in one embodiment;

FIG. 7 is a schematic diagram of pixel coordinates of a 5-fold square mark in one embodiment;

FIG. 8 is a schematic diagram of pixel coordinates of a 5-fold circular mark in one embodiment;

FIG. 9 is a schematic diagram showing a memory area arrangement of the display control apparatus in one embodiment;

FIG. 10 is a diagram illustrating an exemplary memory arrangement for a single frame annotation sequence;

FIG. 11 is a diagram illustrating a storage area configuration for collected frame data according to an embodiment;

fig. 12 is a flowchart illustrating a display control method according to another embodiment.

Detailed Description

The present invention will be described in further detail with reference to the following detailed description and accompanying drawings. Wherein like elements in different embodiments are numbered with like associated elements. In the following description, numerous details are set forth in order to provide a better understanding of the present application. However, those skilled in the art will readily recognize that some of the features may be omitted or replaced with other elements, materials, methods in different instances. In some instances, certain operations related to the present application have not been shown or described in detail in order to avoid obscuring the core of the present application from excessive description, and it is not necessary for those skilled in the art to describe these operations in detail, so that they may be fully understood from the description in the specification and the general knowledge in the art.

Furthermore, the features, operations, or characteristics described in the specification may be combined in any suitable manner to form various embodiments. Also, the various steps or actions in the method descriptions may be transposed or transposed in order, as will be apparent to one of ordinary skill in the art. Thus, the various sequences in the specification and drawings are for the purpose of describing certain embodiments only and are not intended to imply a required sequence unless otherwise indicated where such sequence must be followed.

The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings).

Referring to fig. 1, a schematic diagram of a digital oscilloscope 1 includes an attenuator network 11, an adjustable gain amplifier 12, an analog-to-digital converter 13, a control processing device 14, a display device 15, a digital-to-analog converter 16, and a bias adjustment circuit 17. The attenuation network 11 is configured to perform attenuation adjustment on a signal to be processed input to the digital oscilloscope 1 to adjust the size of the signal in the circuit, and finally output a first adjustment signal. The input signal can here be an analog signal, and the output first control signal is then likewise an analog signal. The attenuation network 11 may have one-time attenuation, ten-time attenuation, and several tens of times attenuation to one hundred times attenuation, which is not limited herein. Since the attenuation network 11 is a common analog signal processing device in a digital oscilloscope, and belongs to the prior art, it is not described here again. The adjustable gain amplifier 12 is configured to perform amplification adjustment on the first adjustment signal to output a second adjustment signal. The adjustable gain amplifier 12 is also called a Variable Gain Amplifier (VGA), and mainly functions to adjust the amplification factor of the signal, for example, for a first adjustment signal with a voltage of 1mV, if the gain of the adjustable gain amplifier is 1000, the voltage of the output second adjustment signal is 1V. The adjustable gain amplifier 12 plays a fine tuning role, and the amplification factor thereof may be several times, several tens of times, several hundreds of times, several thousands of times, and is not limited herein. Since the adjustable gain amplifier 12 is an analog signal processing device commonly used in digital oscilloscopes, and belongs to the prior art, it is not described herein again. The analog-to-digital converter 13 is also called ADC, and is configured to perform analog-to-digital conversion on the second adjustment signal to output digital waveform data of the signal. Since the analog-to-digital converter 13 is a common analog signal processing device in a digital oscilloscope, and belongs to the prior art, it is not described here again. The control processing device 14 is connected to the analog-to-digital converter 13, the control processing device 14 includes a display control device 141 and an offset encoding unit 142, and the display control device 141 is configured to perform precision adjustment on the digital waveform signal and obtain a first waveform according to the precision adjustment. A display device 15 is connected to the control processor 14 for displaying the first waveform. The offset encoding unit 142 may be an operation processing device such as a CPU, the offset encoding unit 142 is connected to the offset adjusting circuit 17 through the analog-to-digital converter 16, the offset encoding unit 142 sequentially sets a first configuration value corresponding to each row of display pixels in the waveform of the signal, and the offset encoding corresponding to a plurality of rows of display pixels in the waveform of the signal is changed by using a plurality of first configuration values. The offset encoding unit 142 is further configured to, when it is determined that the currently set first configuration value causes the configuration code to change, send the changed offset code to the offset adjusting circuit through the digital-to-analog converter 16, so that the offset adjusting circuit 16 performs offset display adjustment on the corresponding rows of display pixels according to the changed offset code, and resets the second configuration value. The front-end circuits of the oscilloscope are all analog signals, and the digital-to-analog converter 16 is used for converting digital signal offset codes into analog signals and outputting the analog signals to the offset adjusting circuit 17. The bias adjustment circuit 17 is operable to generate a plurality of analog bias voltage signals in response to a first configuration value. Since the bias adjusting circuit 17 is a commonly used digital signal processing device in a digital oscilloscope, and belongs to the prior art, it is not described here again. The impedance transformation network 18 is connected to the attenuation network 11, the adjustable gain amplifier 12 and the bias adjusting circuit 17, and is configured to superimpose the first adjusting signal output by the attenuation network with a plurality of analog bias voltage signals generated by the bias adjusting circuit 17 to form a new first adjusting signal, and input the new first adjusting signal to the adjustable gain amplifier 12, so that the adjustable gain amplifier 12 amplifies and adjusts the new first adjusting signal to form a new second adjusting signal, and the analog-to-digital converter 13 also outputs new digital waveform data of the signal after performing analog-to-digital conversion on the new second adjusting signal. The display control device 141 may be a programmable logic processing device such as an FPGA. The bias coding unit 142 is further connected to the adjustable gain amplifier 12 for configuring the gain of the adjustable gain amplifier. The display control device 141 is further configured to generate a configuration menu of the waveform of the signal (the configuration menu may include items such as a status bar and a network), display and superimpose the configuration menu and the waveform of the signal, and send the display and superimposed data to the display device for display.

In the embodiment of the application, a display control method is disclosed, and digital waveform data is obtained according to pre-displayed original sampling data, wherein the digital waveform data comprises the original sampling data and interpolation data, and the interpolation data is data obtained by performing interpolation transformation on the original sampling data. Then driving display equipment to display a first waveform signal according to the digital waveform data; the first waveform signal comprises a sampling point and an interpolation point, wherein the sampling point is a data point obtained based on the original sampling data, and the interpolation point is a data point obtained based on the interpolation data; in the displayed first waveform signal, the sampling point is displayed in a preset first display mode, and the interpolation point is displayed in a preset second display mode. The first display mode is different from the second display mode. Because the sampling point and the interpolation point in the first waveform signal are displayed in different display modes, the digital oscilloscope can quickly acquire the real sampling point value obtained according to the sampling data when the digital oscilloscope reads the waveform data, and the reliability of the waveform reading data is further improved.

Example one

As shown in fig. 1, the digital oscilloscope 1 includes an attenuation network 11, an adjustable gain amplifier 12, an analog-to-digital converter 13, a display device 15, a control processing device 14, a digital-to-analog converter 16, a bias adjustment circuit 17, and an impedance transformation network 18. The attenuation network 11 is configured to perform attenuation processing on a signal to be processed input into the digital oscilloscope 1 to output a first adjustment signal. The adjustable gain amplifier 12 is used for amplifying the first adjustment signal. The analog-to-digital converter 16 is configured to perform analog-to-digital conversion on the amplified first adjustment signal to output a digital waveform signal. The display device 15 is used for display. The control processing device 14 includes a display control device 141 and an offset encoding unit 142. The display control device 141 is configured to obtain digital waveform data according to the digital waveform signal, perform precision adjustment on the obtained digital waveform data, and send the digital waveform data after precision adjustment to the display device 15, so as to control a display result of the display device 15. The display device 15 is used to display the first waveform signal in accordance with the digital waveform data. The offset encoding unit 142 is configured to sequentially set a first configuration value corresponding to each row of display pixels in the first waveform, and change the offset encoding corresponding to the plurality of rows of display pixels in the first waveform by using the first configuration value. The offset encoding unit 142 is further configured to output the changed offset encoding when it is determined that the currently set first configuration value causes the configuration encoding to be changed. The digital-to-analog converter 16 is used to convert the changed offset code into an analog signal. The bias adjusting circuit 17 is used for receiving the bias code of the analog signal and outputting an analog bias voltage signal according to the bias code. The impedance transformation network 18 is configured to superimpose the first conditioning signal and the analog bias voltage signal to obtain a second conditioning signal. The adjustable gain amplifier 12 is also used for amplifying the second adjustment signal. The analog-to-digital converter 13 is further configured to perform analog-to-digital conversion on the amplified second adjustment signal to output an offset-adjusted digital waveform signal.

As shown in fig. 1, the display control device 141 is connected to the display device 15 of the digital oscilloscope 1, and the display control device 141 is configured to send digital waveform data to the display device 15 to control the display result of the display device 15. The digital waveform data comprises original sampling data and interpolation data, and the interpolation data is obtained after the original sampling data is subjected to interpolation transformation. The display device 15 is configured to display a first waveform signal according to the digital waveform data, the first waveform signal including a sampling point and an interpolation point, the sampling point being a data point obtained based on the original sampling data, and the interpolation point being a data point obtained based on the interpolation data. In one embodiment, in the first waveform signal, the sampling points are displayed in a first predetermined display mode, and the interpolation points are displayed in a second predetermined display mode, the first display mode being different from the second display mode. In one embodiment, the first display mode includes color display, shape display and/or shading display. In one embodiment, the second display mode includes color display, shape display and/or shading display.

Referring to fig. 2, which is a schematic structural diagram of a display control apparatus in an embodiment, the display control apparatus 141 includes an interpolation processing apparatus 1441 and a data searching apparatus 1442, and the interpolation processing apparatus 1441 is configured to obtain an original point sequence according to original sample data, and perform interpolation transformation on the original point sequence to obtain an interpolation result sequence. The interpolation processing unit 1441 is further configured to obtain an original point annotation sequence according to the interpolation result sequence, where the original point annotation sequence is used to annotate position information of an element in the original point sequence in the interpolation result sequence. The interpolation processing means is also configured to take the interpolation result sequence and the original point mark sequence as digital waveform data.

In one embodiment, the parameters of the original sampling data of the digital oscilloscope are set as 1G sampling rate and 8bit precision, the size of the waveform display area of the display device is 400 rows × 600 columns, the 600 columns are divided into 12 equal parts, each part is 50 columns, each part represents a time base scale, and the display device brushes 50 frames of data every second. The digital oscilloscope has the function of acquiring and displaying signals meeting the trigger condition. When the current sampling rate is 1G and the time base is 10ns/div, the number of sampling points is:

D=1G/sa*10ns/div*12div=120；

wherein D is the number of sampling points.

Based on the requirements of improving waveform stability and facilitating display control, the acquired data is interpolated to 600 points, namely 1 point in each column, and then the number of displayed points P is equal to:

P=D*I；

wherein, P represents the number of points used for displaying, D represents the original acquisition point, and I represents the interpolation multiple; then I =600/120=5 for a 10ns/div time base. In one embodiment, the time base is based on 5 times interpolation.

The core principle of the invention of the application is to mark the original points in the digital waveform data to be displayed of the display equipment and display the original points to facilitate the distinguishing observation.

The internal data processing of the digital oscilloscope is processed in parallel, for example, 8 points are processed by one clock, and the original sampling data is firstly sorted by columns so as to facilitate understanding of the data conversion process. The method is characterized in that each screen of the display device is set to display 600 points, but some adjustment margins are reserved for later trigger search, so that waveform loss after the trigger search is prevented. The original point sequence obtained from the original sample data is shown in table 1:

TABLE 1 original Point sequence Table

D7

D15

D23

D31

D39

…

D87

D95

D103

D111

D119

D6

D14

D22

D30

D38

…

D86

D94

D102

D110

D118

D5

D13

D21

D29

D37

…

D85

D93

D101

D109

D117

D4

D12

D20

D28

D36

…

D84

D92

D100

D108

D116

D3

D11

D19

D27

D35

…

D83

D91

D99

D107

D115

D2

D10

D18

D26

D34

…

D82

D90

D98

D106

D114

D1

D9

D17

D25

D33

…

D81

D89

D97

D105

D113

D0

D8

D16

D24

D32

…

D80

D88

D96

D104

D112

The original point sequence is interpolated to obtain an interpolation result sequence as shown in table 2:

TABLE 2 sequence Listing of interpolation results

P7

P15

P23

P31

P39

…

P567

P575

P583

P591

P599

P6

P14

P22

P30

P38

…

P566

P74

P582

P590

P598

P5

P13

P21

P29

P37

…

P565

P573

P581

P589

P597

P4

P12

P20

P28

P36

…

P564

P572

P580

P588

P596

P3

P11

P19

P27

P35

…

P563

P571

P579

P587

P595

P2

P10

P18

P26

P34

…

P562

P570

P578

P586

P594

P1

P9

P17

P25

P33

…

P561

P569

P577

P585

P593

P0

P8

P16

P24

P32

…

P560

P568

P576

P584

P592

The positions of the elements in the original point sequence in the interpolation result sequence are shown in table 3:

table 3, a table of positions of elements in the original point sequence in the interpolation result sequence;

X

D3

X

…

X

D115

X

D6

X

…

X

D118

X

D1

X

…

D113

X

D4

X

…

X

D116

X

D7

…

X

D119

X

D2

X

…

X

D114

X

D5

X

…

X

D117

X

D0

X

…

D112

X

and (3) setting the value of the position of the non-original point sequence element in the interpolation result sequence to be 0 and setting the value of the position of the original point sequence element to be 1, and then acquiring an original point annotation sequence, wherein the original point annotation sequence is shown in table 4:

TABLE 4 original points are labeled sequence Listing

0	1	0	0	0	…	0	1	0	0	0
											0	0	0	1	0	…	0	0	0	1	0
1	0	0	0	0	…	1	0	0	0	0
											0	0	1	0	0	…	0	0	1	0	0
0	0	0	0	1	…	0	0	0	0	1
											0	1	0	0	0	…	0	1	0	0	0
0	0	0	1	0	…	0	0	0	1	0
											1	0	0	0	0	…	1	0	0	0	0

In one embodiment, the interpolation result sequence is equal to the original point labeling sequence in length.

In one embodiment, the value of the element used for marking the position of the original point in the original point marking sequence is a first preset value. In one embodiment, the first preset value is "1" or "0". In one embodiment, the first predetermined value is a non-zero value.

The data search unit 1442 is used for intercepting the single-frame display sequence in the interpolation result sequence. Wherein the single-frame display sequence is used to display the digital waveform data of the first waveform signal of one frame as the display device 15. The data searching unit 1442 is further configured to obtain a single-frame annotation sequence according to the original point annotation sequence. The single-frame labeling sequence is used for displaying the position information of the element containing the original point in the interpolation result sequence in the single-frame display sequence. The data searching device is also used for sending the acquired single-frame display sequence and the single-frame marking sequence to the display equipment as digital waveform data so that the display equipment can display the first waveform signal of one frame.

In one embodiment, the single frame display sequence intercepted by the data search device 1442 in the interpolation result sequence is shown in table 5:

table 5, a relationship correspondence table for intercepting a single frame display sequence in the interpolation result sequence:

K7

K15

K23

K31

…

K303

K311

…

K591

K599

K607

K615

K6

K14

K22

K30

…

K302

K310

…

K590

K598

K606

K614

K5

K13

K21

K29

…

K301

K309

…

K589

K597

K605

K613

K4

K12

K20

K28

…

K300

K308

…

K588

K596

K604

K612

K3

K11

K19

K27

…

K299

K307

…

K587

K595

K603

K611

K2

K10

K18

K26

…

K298

K306

…

K586

K594

K602

K610

K1

K9

K17

K25

…

K297

K305

…

K585

K593

K601

K609

K0

K8

K16

K24

…

K296

K304

…

K584

K592

K600

K608

wherein the elements marked with gray are elements of a single-frame display sequence.

The sequence was displayed for the extracted single frames and rearranged as shown in table 6:

table 6, sequence listing is displayed for the single frame after rearrangement:

Q7

Q15

Q23

Q31

Q39

…

Q567

Q575

Q583

Q591

Q599

Q6

Q14

Q22

Q30

Q38

…

Q566

Q74

Q582

Q590

Q598

Q5

Q13

Q21

Q29

Q37

…

Q565

Q573

Q581

Q589

Q597

Q4

Q12

Q20

Q28

Q36

…

Q564

Q572

Q580

Q588

Q596

Q3

Q11

Q19

Q27

Q35

…

Q563

Q571

Q579

Q587

Q595

Q2

Q10

Q18

Q26

Q34

…

Q562

Q570

Q578

Q586

Q594

Q1

Q9

Q17

Q25

Q33

…

Q561

Q569

Q577

Q585

Q593

Q0

Q8

Q16

Q24

Q32

…

Q560

Q568

Q576

Q584

Q592

the single frame annotation sequence obtained by intercepting the corresponding original point annotation sequence according to the single frame display sequence is shown in table 7:

table 7, single frame annotation sequence table:

0	0	0	1	0	…	0	0	0	1	0
											1	0	0	0	0	…	1	0	0	0	0
0	0	1	0	0	…	0	0	1	0	0
											0	0	0	0	1	…	0	0	0	0	1
0	1	0	0	0	…	0	1	0	0	0
											0	0	0	1	0	…	0	0	0	1	0
1	0	0	0	0	…	1	0	0	0	0
											0	0	1	0	0	…	0	0	1	0	0

the elements corresponding to the original point positions in the single-frame display sequence can be obtained according to the single-frame tagging sequence, for example, as shown in table 8:

table 8, a position indication table of the single-frame display sequence corresponding to the single-frame annotation sequence element value of 1:

X

D6

X

…

X

D115

X

D118

X

D1

X

…

D113

X

D4

X

…

X

D116

X

D7

…

X

D119

X

D2

X

…

X

D114

X

D5

X

…

X

D117

X

D0

X

…

D112

X

D3

X

…

X

wherein D is an element value of the original point sequence, and X is an element value of an interpolation result sequence obtained by interpolation conversion.

In one embodiment, the display control device performs histogram statistics on data and marks, and the first step of display is to perform histogram statistics on the received original sampled data, wherein the histogram statistics mainly performs two functions, the histogram statistics is performed on the original sampled data, and the connection between points is performed in a point display mode (the point display mode does not need the connection), and then a mode of line display connection is performed after the histogram statistics in the digital oscilloscope is completed is taken as a reference.

The values at 8 points in column 1 of table 8 are set:

[Q7,Q6,Q5,Q4,Q3,Q2,Q1,Q0]=[0x6F, 0x72, 0x76, 0x78, 0x7B, 0x7C, 0x7D, 0x7E] ；

displaying 600 points on 600 columns, wherein one point is arranged in each column, and two adjacent points need to be connected; the logic of the connection line is that the adjacent two points compare in size, when the two points are not equal, the connection line is from the previous column to the next column, and for the sequence 1, the following steps are included:

column 1, P0= P0, showing point P0, 0x 7E;

column 2, P1< P0, requires a link, showing points 0x7D, 0x 7E;

column 3, P2< P1, requires a link, showing points 0x7C, 0x 7D;

column 4, P3< P2, requires a link, showing points 0x7B, 0x 7C;

column 5, P4< P3, requires connecting lines, showing points 0x78, 0x79, 0x7A, 0x 7B;

column 6, P5< P4, requires wiring, showing points 0x76, 0x77, 0x 78;

column 7, P6< P5, requires connecting lines, showing points 0x72, 0x73, 0x74, 0x75,0x 76;

column 8, P7< P6, requires connecting lines, showing points 0x6F, 0x70, 0x71, 0x 72;

the digital oscilloscope connections are intended to be fixed from small to large values, with Q1 and Q6 being the starting points in sequence 1, the labels should be labeled at column 2, 0x7D and column 7, 0x72, and the labels should follow the same rules.

Referring to fig. 3, a timing diagram of digital signals of a digital oscilloscope according to an embodiment of the present invention is shown, wherein x represents the horizontal row of the screen; y represents the amplitude of the signal, which is also the vertical direction coordinate of the screen; valid indicates that the point is valid and highly valid; data represents the probability of the point, and each point in an interpolated time base 1 frame is 1; marker indicates the marked origin. In addition, if the screen refresh rate is set to be 50 frames per second, the duration of a display frame of one display device is 1/50=20ms, and in order to achieve the effect of afterglow display, the digital oscilloscope usually counts the gray values of all acquired data in 1 display frame, so that a plurality of acquired frames can be actually acquired within the time threshold of 20ms, and are displayed together after counting.

Referring to fig. 4, a schematic diagram of a display principle of a display device in an embodiment is shown, where the collected frames are 1 to n in fig. 4, and indicate that n frames are collected within a period of 20ms, each frame of data is cached in an area a, the area a is a memory, after 20ms is finished, the data in the area a is uniformly moved to an area B at one time, the area B is also a memory, and finally, the area B is used to drive a display to display. The process of data entering zone A is called data statistics in the application, and the process from zone A to zone B is called data migration in the application. Because the collected 1 to n frames of data are different and the superposed marks are disordered, only the original point mark of the last frame is displayed to prevent the phenomenon that the superposed waveform of the marks is difficult to observe, and only the last frame is selected to be displayed because the collected nth frame is always the last frame collected frame in all the frames of the observation display device, the marks of the previous n-1 frames are lost, and only the last frame collected frame is reserved. And data of all frames cannot be discarded, otherwise, the persistence display function cannot be realized.

In one embodiment, the first display mode includes a mark, and the mark is generated first, and the mark can be set to be different in size and shape. Please refer to fig. 5, which is a schematic diagram illustrating a display manner of a square mark according to an embodiment, wherein a dark dot represents an original point, and a light black dot represents a mark. In fig. 5, two square marks are shown, the left side is a mark schematic diagram under 2-fold interpolation, and the right side is a mark schematic diagram under 5-fold interpolation. Then the marked minimum pixel _ min =1 and the maximum pixel _ max = floor (interpolation multiple/2), floor indicating rounding down. For example, with the interpolation index of 5 times, if the interpolation multiple I =5, then pixel _ min =1, and pixel _ max = 2; under the condition of 5 times interpolation, the marked pixels are increased by 1 at least in all directions, the marked pixels are increased by 2 at most in all directions, and the increment is controlled by the display control device and can be set by a user within the range of [ pixel _ min, pixel _ max ].

Referring to fig. 6, a schematic diagram of a display manner of a circular mark in an embodiment is shown, wherein a dark black dot represents an original point, and a light black dot represents the mark. In fig. 6, two circular markers are shown, the left graph is a schematic diagram of the markers under 2-fold interpolation, and the right graph is a schematic diagram of the markers under 5-fold interpolation. The shape of the mark is customized according to the related setting, but the marks of adjacent points can be connected and cannot be overlapped.

The shape of the mark is set, and the pixel coordinates corresponding to the mark are extracted. Take the 5-fold interpolation in fig. 5 and 6 as an example. The pixel coordinates of the square mark are shown in fig. 7, which is a schematic diagram of the pixel coordinates of the square mark of 5 times in one embodiment, and the pixel coordinates of the circular mark are shown in fig. 8, which is a schematic diagram of the pixel coordinates of the circular mark of 5 times in one embodiment. The original point (dark black point) is marked first, and then, assuming that the coordinates of the black point in fig. 5 are (x, y), each marked point is known, as shown in fig. 7 specifically; the pixel coordinates of the circular markers are shown in fig. 8.

In one embodiment, the display control apparatus further includes a first storage area, a second storage area, and a third storage area. The first storage area is used for storing interpolation result sequences, the second storage area is used for storing original point marking sequences, and the third storage area is used for storing single-frame display sequences. The data searching device obtains the single frame marking sequence according to the original point marking sequence stored in the second storage area and the single frame display sequence stored in the third storage area.

Referring to fig. 9, a schematic diagram of a storage area configuration of a display control device in an embodiment is shown, in which the display control device stores an original point of a deep black dot first when displaying a mark. The storage mark is stored in the first storage area, the mark coordinate information is stored in the second storage area, the marking process only needs to store the mark of the last frame, one area can be ensured to store the current frame information, the other area waits for storing the next frame after being cleared, and the last frame is selected through the control signal to be output. With reference to fig. 3 and 9, the x, y and data information is written into the RAM with the marker as the enable; the output selection is a 1bit signal and the acquisition frame in fig. 3 is flipped once for each time so that the last frame can be recorded. Referring to fig. 10, a schematic diagram of the storage area configuration of the single frame annotation sequence in an embodiment is shown, after the real frame of a display device is finished, the mark of the last recorded frame is transferred to the third storage area at a time.

The mark is read from the first storage area and the second storage area, and after the coordinates (x, y) of the dark black dot are obtained as shown in fig. 7 or fig. 8, the coordinates of the remaining light black dots are known, and for example, in fig. 7, the mark is written into the third storage area according to the principle of from bottom to top and from left to right, and according to the increasing direction of the address of the third storage area from small to large, for example:

the coordinate point sequence is:

{(x-2,y-2),(x-2,y-1),(x-2,y),(x-2,y+1), (x-2,y+2),(x-1,y-2)……}；

the corresponding third storage area address is:

{addr0,addr1,addr2,addr3,addr4,addr5……}；

and the end is indicated when the marker read out from the first storage area and the second storage area is 0.

The above is the recording and operation of the flag, and the operation of the data is set below. We open up two areas for storing data, please refer to fig. 11, which is a schematic diagram of a storage area for collecting frame data in an embodiment, when one collected frame data is written into a fourth storage area, the RAM address = { x, y }, and with reference to fig. 3, it is equivalent to write data into the area with the address { x, y }, and when the display frame is finished, all data is moved to a fifth storage area at one time, and this moving process needs to be controlled according to the content of the third storage area. The move means reading and writing data from and to the fourth storage area to and from the fifth storage area. When the fourth storage area is moved to the fifth storage area, the addresses are read in an increasing mode from small to large, and at the moment, the third storage area reads data; when the read address of the fourth storage area is equal to the read content of the third storage area, replacing the data (x) of the fourth storage area with the data D (x) of the third storage area and then writing the data D (x) into the fifth storage area; then the address of the third memory area is added with 1, and the fourth memory area continues to operate; until the data d (x) read out from the third storage area is 0, which indicates that all the marked pixels have been read out, the process can be finished; at this point the fourth storage area continues to move until the completion is complete. And after all the shifts are finished, the display device uses the data in the fifth storage area for display, so that the display rendering work of the original point mark is finished.

In the embodiment of the application, the disclosed display control device is connected with the display equipment of the digital oscilloscope and used for sending digital waveform data to the display equipment so as to control the display result of the display equipment, and the display equipment displays the first waveform signal according to the digital waveform data. The first waveform signal comprises a sampling point and an interpolation point, the sampling point is displayed in a preset first display mode, the interpolation point is displayed in a preset second display mode, and the first display mode is different from the second display mode. Because the sampling point and the interpolation point in the first waveform signal are displayed in different display modes, the digital oscilloscope can quickly acquire the real sampling point value obtained according to the sampling data when the digital oscilloscope reads the waveform data, and the reliability of the waveform reading data is further improved.

Example two

Referring to fig. 12, a schematic flow chart of a display control method in another embodiment is shown, where the display control method includes:

step 101, acquiring original sampling data;

step 102, acquiring digital waveform data according to the original sampling data. The digital waveform data comprises original sampling data and interpolation data, and the interpolation data is data obtained by interpolation transformation of the original sampling data.

103, driving the display device to display a first waveform signal according to the digital waveform data; the first waveform signal comprises a sampling point and an interpolation point, wherein the sampling point is a data point obtained based on original sampling data, and the interpolation point is a data point obtained based on the interpolation data; in the displayed first waveform signal, the sampling point is displayed in a preset first display mode, and the interpolation point is displayed in a preset second display mode. The first display mode is different from the second display mode.

In one embodiment, driving a display device to display a first waveform signal according to digital waveform data includes:

step 1021, acquiring an original point sequence according to the original sampling data, and performing interpolation transformation on the original point sequence to acquire an interpolation result sequence;

and step 1022, acquiring an original point annotation sequence according to the interpolation result sequence. The original point labeling sequence is used for labeling the position information of the elements in the original point sequence in the interpolation result sequence;

and step 1023, taking the interpolation result sequence and the original point mark sequence as digital waveform data.

In an embodiment of the present application, a display control method is disclosed, which first obtains digital waveform data according to pre-displayed original sample data, where the digital waveform data includes the original sample data and interpolation data, and the interpolation data is data obtained by performing interpolation transformation on the original sample data. Then driving display equipment to display a first waveform signal according to the digital waveform data; the first waveform signal comprises a sampling point and an interpolation point, wherein the sampling point is a data point obtained based on the original sampling data, and the interpolation point is a data point obtained based on the interpolation data; in the displayed first waveform signal, the sampling point is displayed in a preset first display mode, and the interpolation point is displayed in a preset second display mode. The first display mode is different from the second display mode. Because the sampling point and the interpolation point in the first waveform signal are displayed in different display modes, the digital oscilloscope can quickly acquire the real sampling point value obtained according to the sampling data when the digital oscilloscope reads the waveform data, and the reliability of the waveform reading data is further improved.

According to the display control device and method, under the condition of the digital oscilloscope interpolation time base, the original point information in the current waveform can be clearly indicated in the point display mode, the original point information in the current waveform can also be indicated in the online display mode, and good user experience is further provided.

Those skilled in the art will appreciate that all or part of the functions of the various methods in the above embodiments may be implemented by hardware, or may be implemented by computer programs. When all or part of the functions of the above embodiments are implemented by a computer program, the program may be stored in a computer-readable storage medium, and the storage medium may include: a read only memory, a random access memory, a magnetic disk, an optical disk, a hard disk, etc., and the program is executed by a computer to realize the above functions. For example, the program may be stored in a memory of the device, and when the program in the memory is executed by the controller, all or part of the functions described above may be implemented. In addition, when all or part of the functions in the above embodiments are implemented by a computer program, the program may be stored in a storage medium such as a server, another computer, a magnetic disk, an optical disk, a flash disk, or a portable hard disk, and may be downloaded or copied to a memory of a local device, or may be version-updated in a system of the local device, and when the program in the memory is executed by a controller, all or part of the functions in the above embodiments may be implemented.

The present invention has been described in terms of specific examples, which are provided to aid understanding of the invention and are not intended to be limiting. For a person skilled in the art to which the invention pertains, several simple deductions, modifications or substitutions may be made according to the idea of the invention.

Claims

1. A display control apparatus for a digital oscilloscope, the digital oscilloscope having a display device;

in the first waveform signal, the sampling points are displayed in a preset first display mode, and the interpolation points are displayed in a preset second display mode; the first display mode is different from the second display mode;

the display control means includes interpolation processing means;

the interpolation processing means is further configured to take the interpolation result sequence and the original point mark sequence as the digital waveform data;

the interpolation result sequence is equal to the original point marking sequence in length; the value of an element used for marking the position of the original point in the original point marking sequence is a first preset value; the display control device further comprises a data searching device;

the data searching device is used for acquiring a single-frame labeling sequence according to the original point labeling sequence; the single-frame labeling sequence is used for the position information of the element containing the original point in the interpolation result sequence in the single-frame display sequence;

2. The display control apparatus according to claim 1, further comprising a first storage area, a second storage area, and a third storage area;

3. The display control apparatus according to claim 1, wherein the first display manner includes a color display, a shape display, and/or a shading display;

the second display mode comprises color display, shape display and/or light and shade display.

4. A digital oscilloscope, comprising:

a display device for displaying;

a control processing device including the display control device according to any one of claims 1 to 3; the display control device is used for acquiring the digital waveform data according to the digital waveform signal, then performing precision adjustment on the acquired digital waveform data, and sending the digital waveform data after precision adjustment to the display equipment so as to control the display result of the display equipment;

5. A display control method for a digital oscilloscope, comprising:

acquiring original sampling data;

driving a display device to display a first waveform signal according to the digital waveform data; the first waveform signal comprises a sampling point and an interpolation point, wherein the sampling point is a data point obtained based on the original sampling data, and the interpolation point is a data point obtained based on the interpolation data; in the displayed first waveform signal, the sampling point is displayed in a preset first display mode, and the interpolation point is displayed in a preset second display mode; the first display mode is different from the second display mode;

the driving the display device to display the first waveform signal according to the digital waveform data includes:

taking the interpolation result sequence and the original point mark sequence as the digital waveform data;

the interpolation result sequence is equal to the original point marking sequence in length; the value of an element used for marking the position of the original point in the original point marking sequence is a first preset value;

the driving the display device to display the first waveform signal according to the digital waveform data further comprises:

intercepting a single-frame display sequence in the interpolation result sequence; the single-frame display sequence is used for displaying digital waveform data of one frame of the first waveform signal as the display equipment;

acquiring a single-frame labeling sequence according to the original point labeling sequence; the single-frame labeling sequence is used for the position information of the element containing the original point in the interpolation result sequence in the single-frame display sequence;

and sending the acquired single-frame display sequence and the single-frame labeling sequence as the digital waveform data to the display equipment so as to be used for the display equipment to display a frame of first waveform signal.

6. A computer-readable storage medium characterized by comprising a program executable by a processor to implement the display control method as claimed in claim 5.