CN102466747B - A kind of measurement data compression display device and control method thereof - Google Patents
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Abstract
A kind of measurement data compression display device and control method thereof, this device includes the data acquisition module (101) for gathering measurement data (104), for by described measurement data (104) packet, and from described grouping mea-sure data, select out the data compressing module (102) of video data (105), for according to described video data (105), produce the data disaply moudle (103) of display waveform (106), wherein, described data compressing module (102), maximum and the minima of grouped data can be selected out from described grouped data, and according to described maximum and minima, and described maximum and minima putting in order in grouped data, form described video data (105). the measurement data compression of present invention waveform (106) shown by display device, it is possible to reflect the succession relation between the maximum in each grouped data and minima accurately, thus accurately keeping the feature of each grouped data.
Description
Technical field
A kind of measurement data compression display device of the present invention and control method thereof relate to the measurement apparatus field showing tested electric signals with waveform.
Background technology
In prior art, show that with wavy manner the device of tested electric signals has multiple, wherein, be most commonly that digital oscilloscope certainly, also have some digital multimeter and data collecting system also to have the function that can show measured signal with wavy manner.
With wavy manner, these can show that the device of tested electric signals generally requires the problem solving how substantial amounts of measurement signal pressure shortens into limited display signal, in order on the display screen that pixel is limited, show measured signal with wavy manner.
Such as, when digital oscilloscope carries out data acquisition, the data volume of the measurement data every time collected is very big, before saving it in the cyclical memory of digital oscilloscope, it is accomplished by these measurement data collected are carried out the compression of data, again such as, when showing that the digital multimeter of measurement data carries out data acquisition by waveform display mode, if the data volume of the measurement data collected is more than the number of pixels of the X direction of its display screen, also these measurement data are carried out data compression.
The data compression method adopted at present is limited, such as maximum extraction method, minima extraction method, randomly draws method, meansigma methods extraction method etc., but these schemes are all individually present some problems, such as:
Maximum extraction method: be by measurement data is divided into multiple grouped data, then the method therefrom selecting out maximum realizes data compression, utilizes the waveform that this compression method is formed, it is impossible to the real minima information reproducing grouped data, makes wave distortion.
Minima extraction method: be by measurement data is divided into multiple grouped data, then the method therefrom selecting out minima realizes data compression, utilizes the waveform that this compression method is formed, it is impossible to the real maximum value information reproducing grouped data, makes wave distortion.
Meansigma methods extraction method: be by measurement data being divided into multiple grouped data, calculate the meansigma methods of each grouped data, recycle this meansigma methods and constitute compression data, utilize the waveform that this compression method is formed, maximum and the minima information of grouped data cannot be reproduced too really, equally also can make wave distortion.
In order to solve above-mentioned problem, application number 200710089620, name is called the Chinese invention patent of " waveform compression and display ", disclose a kind of method simultaneously using multiple measurement data compact model, such as, use maximum and minima selection method that measurement data is compressed simultaneously, then pass through alternately display mode and show the waveform being selected method acquisition by maximum and minima. Making the waveform that user sees is being formed by stacking by two above-mentioned waveforms.
Although the disclosed compression method of application number 200710089620 solves the loss of learning problem that single compressed method exists, but it is simultaneously introduced new problem, namely the different compression data corresponding to same section of measurement data are repeatedly shown, waveform capture rate can be made to be substantially reduced, and, when alternately showing the waveform corresponding to maximum value data and the waveform corresponding to minima data, succession relation between the maximum reflected in each grouped data and minima that cannot be correct, it is easy to occur that mistake understands the situation of measurement data.
Summary of the invention
It is an object of the invention to provide the measurement data of the succession relation between a kind of maximum shown in each grouped data and minima that can be correct and compress display device.
Described a kind of measurement data compression display device includes: a data acquisition module, is used for gathering measurement data; One data compressing module, for by described measurement data packet, producing grouped data, and select out video data from described grouping mea-sure data; One data disaply moudle, for according to described video data, producing display waveform; Wherein, described data compressing module, for from described grouped data, selects out the maximum of grouped data and minima and according to described maximum and minima, and described maximum and minima putting in order in grouped data, form described video data.
According to one embodiment of present invention, described data compressing module in compression display device of the present invention may be used for from described grouped data, and serial is selected out the maximum of grouped data and minima and records described maximum and minima putting in order in grouped data respectively;
According to one embodiment of present invention, described data compressing module in compression display device of the present invention can be also used for from described grouped data, and parallel decimation goes out the maximum of grouped data and minima and records described maximum and minima putting in order in grouped data respectively;
According to one embodiment of present invention, described data compressing module in compression display device of the present invention can be also used for the maximum described in comparison and minima putting in order in grouped data be ranked according to result of the comparison described maximum and minima sequencing in described video data.
Measurement data of the present invention compression waveform shown by display device can reflect the succession relation between maximum and the minima in each grouped data accurately, thus accurately keeping the feature of each grouped data, it is particularly well-suited to waveform amplify and analyze or other are it will be clear that the situation of succession relation between maximum and minima in each grouped data, and, there is the feature of easily realization.
The present invention also aims to provide the control method of the measurement data compression display device of the succession relation between a kind of maximum shown in each grouped data and minima that can be correct.
The control method of described a kind of measurement data compression display device, including step,
From described grouped data, select out the maximum of grouped data and minima and according to described maximum and minima, and described maximum and minima putting in order in grouped data, form described video data.
According to one embodiment of present invention, method of the present invention can include step,
From described grouped data, serial is selected out the maximum of grouped data and minima and records described maximum and minima putting in order in grouped data respectively;
According to still another embodiment of the invention, method of the present invention can also include step,
From described grouped data, parallel decimation goes out the maximum of grouped data and minima and records described maximum and minima putting in order in grouped data respectively;
According to still another embodiment of the invention, method of the present invention can also include step,
Relatively more described maximum and minima putting in order in grouped data, and be ranked according to result of the comparison described maximum and minima sequencing in described video data.
The control method of measurement data of the present invention compression display device can make display waveform reflect the succession relation between the maximum in each grouped data and minima accurately, thus accurately keeping the feature of each grouped data, it is particularly well-suited to waveform amplify and analyze or other are it will be clear that the situation of succession relation between maximum and minima in each grouped data, and, there is the feature of easily realization.
Accompanying drawing explanation
Fig. 1 show the structure explanation figure of the measurement apparatus 100 selected by embodiments of the invention.
The further structure explanation figure of the data compression component 102 that Fig. 2 show in measurement apparatus 100.
The illustration figure of the measurement data 301,302,303,304 that Fig. 3 show in grouped data 204.
Fig. 4 show after the measurement data 301,302,303,304 in grouped data 204 carries out maximum and minima selection and sequence, the illustration figure of the video data 105 of formation.
Fig. 5 is the explanation figure of decimation block 202.
Fig. 6 is a structure example explanation figure of decimation block 202.
Fig. 7 is another structure example explanation figure of decimation block 202.
Fig. 8 is the step explanation figure of the data processing step 800 that data compression component 102 performs.
Fig. 9 is the structure explanation figure of a kind of digital multimeter applying data processing step 800.
Detailed description of the invention
In the first embodiment selected by the present invention, select measurement apparatus 100, referring to Fig. 1.
Measurement apparatus 100 includes data acquisition components 101, data compression component 102 and waveform display unit 103, wherein, data acquisition components 101 is used for measuring and produce measurement data 104, data compression component 102 is for being compressed measurement data 104, producing video data 105, waveform display unit 103 includes display screen 106, for video data 105 is mapped to display screen 106, form the waveform corresponding with video data 105 on display 106.
In the present embodiment, data compression component 102 includes 201, decimation block 202 of a grouping module and an order module 203, referring to Fig. 2.
Grouping module 201 is for according to data compression ratio, described measurement data 104 is grouped, produce grouped data 204, decimation block 202 for from described grouped data 204, is selected out the maximum of grouped data and minima and records described maximum and the minima information that puts in order in grouped data.
Order module 203, for the information that puts in order in grouped data 204 according to described maximum and minima, sorts for described maximum and minima, thus forming video data 105.
Concrete example, in conjunction with referring to figs. 2 and 3, such as, time data compression ratio is 2: 1, measurement data 104 is just sequentially grouped into multiple grouped data 204 by grouping module 201. during packet, every 4 measurement data are made to be divided into a grouped data 204, then carried out the calculating of maximum and minima for each grouped data 204 by decimation block 202, such as grouped data 204 is by 4 measurement data 301, 302, 303, during 304 composition, it is measurement data 302 that decimation block 202 just calculates maximum therein, minima is measurement data 304, also record the sequencing information of measurement data 302 and measurement data 304 simultaneously, and accordingly, the position of the measurement data that is ranked in video data 105 302 is above, the position of measurement data 304 is later, referring to Fig. 4.
As an example, in conjunction with referring to figs. 2 and 3, in the present embodiment, when data compression ratio is 4: 1 time, grouping module 201 can make every 8 measurement data be divided into a grouped data 204, when data compression ratio is 8: 1 time, grouping module 201 can make every 16 measurement data be divided into a grouped data 204, the rest may be inferred, when compression ratio is L: 1, grouping module 201 can make every 2L measurement data be divided into a grouped data 204, is then carried out the calculating of maximum and minima for each grouped data 204 by decimation block 202.
As an example, the method for sequencing information of record maximum and minima has multiple, such as, in this illustrations, it is possible to by record maximum sorting position in this grouped data 204 be 2, the sorting position of minima be 4. Thus calculating the sorting position of maximum front, the sorting position of minima is rear. Again such as, only in accordance with the sequencing producing minima and maximum, and specifically do not calculate maximum and minima particular location in grouped data, it is also possible to provide the sequencing information of maximum and minima.
In the present embodiment, data compression component 102 is built realization by hardware circuit, and this hardware can also be realized by programming device, such as FPGA, CPLD device, it is also possible to be realized by customization device ASIC circuit.
In the present embodiment, grouping module 201 can utilize enumerator to realize, and the data of specified quantity can be divided into one group by rolling counters forward.
Decimation block 202 can be made up of a parallel arrangement of maximum decimator 501 and a minima decimator 502, with reference to Fig. 5. Wherein maximum decimator 501 and minima decimator 502 receive grouped data 204 for parallel, calculate the maximum in each grouped data 204 and minima respectively, and the position that described max min is in grouped data 204, finally respectively by result of calculation output to order module 203, order module 203 is for the output according to maximum decimator 501 and minima decimator 502, the sequencing of described maximum and the minima of being ranked, forms video data 105.
As an example, a maximum decimator 601 that decimation block 202 can also be arranged by serial and a minima decimator 602 and an enumerator 603 are connected in series and constitute, with reference to Fig. 6. Each measurement data in grouping mea-sure data 204 sequentially passes through described maximum decimator 601 and minima decimator 602, whether maximum decimator 601 and minima decimator 602 are the maximum in each grouped data 204 and minima in order to calculate the measurement data received, and the position that described max min is in grouped data 204. Enumerator 603 therein is for by adding up cycle-index, the maximum of total data in grouped data 204 and the calculating of minima are judged whether, when not completed, continue the next measurement data in grouped data 204 is calculated, after the calculating of the total data completed in grouped data 204, by result of calculation, the described maximum namely calculated and minima, and the positional information that described max min is in grouped data 204 exports to order module 203. Order module 203, for the output according to maximum decimator 601 and minima decimator 602, forms video data 105.
As another illustration, decimation block 202 can also be connected in series formed by a maximum decimator 701 and a minima decimator 702, referring to Fig. 7, grouping mea-sure data 204 initially enter maximum decimator 701, first the maximum in each grouped data 204 and the position that described maximum is in grouped data 204 are calculated. Then grouped data 204 enters back into minima decimator 702, calculates the minima in each grouped data 204 and the position that described minima is in grouped data 204. Finally, decimation block 202 is again by result of calculation, the described maximum namely calculated and minima, and the positional information that described max min is in grouped data 204 exports to order module 203. Order module 203, for the output according to maximum decimator 701 and minima decimator 702, forms video data 105.
In the present embodiment, order module 203 can include a comparator, for passing through to compare the magnitude relationship of maximum and the minima data that put in order in grouped data 204 described in decimation block 202 output, calculate described maximum and minima putting in order in grouped data 204, and accordingly, sort for described maximum and minima, form video data 105.
As an example, the data compression component 102 described in the present embodiment can also be made up of DSP or other kinds of control device. The data compression component 102 data processing step 800 for performing, in conjunction with reference to Fig. 2 and Fig. 8. Data processing step 800 includes:
N number of some step 801 is read according to compression ratio:
For according to predetermined data compression ratio, reading in data, every D data are made to form a grouped data.
If current compression ratio is 2: 1, then D=4;
If compression ratio is 4: 1, then D=8,
Class pair according to this, when compression ratio is L: 1, N=2L.
The value of first point is assigned to MAX and MIN step 802:
For first measured data values in described grouped data 204 being assigned to maximum value variable MAX and minima variable MIN.
Arranging enumerator T is 0, and sequence mark bSort is 0 step 803:
For initializing, make counter variable T=0 and sequence indexed variable bSort=0.
In data n-th is assigned to TEMP step 804:
For the n-th measurement data in grouped data 204 being taken out, and it is assigned to temporary variable TEMP, for comparing with maximum value variable MAX and minima variable MIN.
TEMP > MAX? step 805:
For temporary variable TEMP and maximum value variable MAX is compared, it is judged that whether it is more than maximum value variable MAX.
If temporary variable TEMP is more than maximum value variable MAX, perform MAX=TEMP, bSort=1 step 806, otherwise, perform TEMP < MIN? step 807.
MAX=TEMP, bSort=1 step 806:
If temporary variable TEMP is more than maximum value variable MAX, then make the value value equal to temporary variable TEMP of maximum value variable MAX, sequence is indicated that bSort is set to 1 simultaneously. Then, do you perform TEMP < MIN? step 807.
TEMP < MIN? step 807:
Temporary variable TEMP and minima variable MIN is compared, it is judged that whether it is less than minima variable MIN.
If temporary variable TEMP is less than minima variable MIN, then perform MIN=TEMP, bSort=0 step 808, otherwise perform n=n+1 step 809.
MIN=TEMP, bSort=0 step 808:
If temporary variable TEMP is less than minima variable MIN, then the value of minima variable MIN is updated the value equal to temporary variable TEMP, be 0 by sequence traffic sign placement simultaneously. Then n=n+1 step 809 is performed.
N=n+1 step 809:
Counter variable T is added 1.
N < N? step 810:
T and N is compared, sees last measurement data whether being computed in grouped data 204.
As T < N, when namely not calculating last measurement data in grouped data 204, again perform n-th in data is assigned to TEMP step 804, otherwise perform bSort==0? step 811.
BSort==0? step 811:
Judge whether sequence mark bSort is 0.
When bSort is 0, performing MAX front, MIN, in rear step 812, otherwise performs MIN front, and MAX is in rear step 813.
MAX is front, and MIN is in rear step 812:
If sequence mark bSort is 0, maximum value variable MAX is sorted before the MIN of minima variable, forms described display signal 105.
MIN is front, and MAX is in rear step 813:
If sequence mark bSort is 1, minima variable MIN is sorted before maximum value variable MAX, forms described display signal 105.
The extraction of N number of point completes step 814
For exporting described display signal 105
As an example, in the present embodiment, described measurement apparatus 100 can be digital oscilloscope, with reference to Fig. 1, data acquisition components 101 includes oscillographic measurement parts, trigger unit and AD conversion parts, waveform display unit 103 also includes data acquisition memorizer, data acquisition memorizer described here is also called cyclical memory, for preserving at a high speed the measurement data that data acquisition components 101 collects, and according to the triggering signal that trigger unit produces, provide video data for waveform display. Data compression component 102 is arranged between described AD conversion parts and described data acquisition memorizer, for compressing the measurement data of AD conversion parts output, and by the data output after compression to described data acquisition memorizer, process for follow-up data and display processes.
As an example, in the present embodiment, described measurement apparatus 100 can also is that another digital oscilloscope, it is different from above-mentioned digital oscilloscope, its data acquisition components 101 includes oscillographic measurement parts and AD conversion parts and one for preserving the measurement data memory unit of measurement data, waveform display unit 103 includes a video data memory unit for preserving video data for waveform display, data compression component 102 is arranged between described measurement data memory unit and described video data memory unit, for by the measurement data boil down to video data in described measurement data memory unit.
As another illustration, in the present embodiment, described measurement apparatus 100 can also is that digital multimeter, in described digital multimeter, what data acquisition components 101 included circuit tester measures parts, AD conversion parts and one for preserving the measurement data memory unit of measurement data, waveform display unit 103 includes a video data memory unit, and waveform display unit 103 shows for providing the waveform corresponding with the video data of preservation in described video data memory unit. In this illustration, data compression component 102 is arranged between described measurement data memory unit and described video data memory unit, for the measurement data in measurement data memory unit being compressed and being saved in described video data memory unit.
As another illustration, described measurement apparatus 100 is another digital multimeter, it is different from the above embodiments, in described digital multimeter, in conjunction with reference to Fig. 9, waveform display unit 103 includes a real-time measuring data display unit 901 and the display screen of a compression data display unit 902.
Real-time measuring data display unit 901 is to there being a real-time measuring data memorizer 903, compression data display unit 902, to there being a Compressed Data Storage 905, is connected to data compression component 906 between real-time measuring data memorizer 903 and compression data display unit 902.
In this illustration, real-time measuring data memorizer 903 is for the measurement data 104 according to data acquisition components 101 output, displaying data in real-time is provided for real-time measuring data display unit 901, real-time measuring data display unit 901, for the displaying data in real-time provided according to real-time measuring data memorizer 903, presents the display waveform 904 corresponding with measurement data 104 in real time.
In this illustration, data compression component 906 is for compressing the displaying data in real-time of storage in real-time measuring data memorizer 903, and sends the data after compression to Compressed Data Storage 905.
In this illustration, Compressed Data Storage 905 is for the compression data of cumulative data compression member 906 output, the compression data display unit 902 compression data for preserving according to Compressed Data Storage 905, it is provided that corresponding waveform 906.
In this illustration, data compression component 906 is to be made up of DSP device, realizes data compression by performing data processing step 800.
In this illustration, data compression component 906, it is also possible to be made up of programming devices such as FPGA.
Claims (8)
1. a measurement data compression display device, including:
One data acquisition module, is used for gathering measurement data;
One data compressing module, for by described measurement data packet, producing grouped data, and select out video data from described grouped data;
One data disaply moudle, for according to described video data, producing display waveform;
It is characterized in that:
Described data compressing module, for from described grouped data, select out the maximum of grouped data and minima and according to described maximum and minima, and described maximum and minima putting in order in grouped data, form described video data.
2. compression display device according to claim 1, it is characterised in that:
Described data compressing module, for from described grouped data, serial is selected out the maximum of grouped data and minima and records described maximum and minima putting in order in grouped data respectively.
3. compression display device according to claim 1, it is characterised in that:
Described data compressing module, for from described grouped data, parallel decimation goes out the maximum of grouped data and minima and records described maximum and minima putting in order in grouped data respectively.
4. the compression display device according to claim 1,2 or 3, it is characterised in that:
Described data compressing module, for relatively more described maximum and minima putting in order in grouped data, and be ranked according to result of the comparison described maximum and minima sequencing in described video data.
5. a control method for the measurement data compression display device described in claim 1,
It is characterized in that: include step,
From described grouped data, select out the maximum of grouped data and minima and according to described maximum and minima, and described maximum and minima putting in order in grouped data, form described video data.
6. control method according to claim 5, it is characterised in that: include step,
From described grouped data, serial is selected out the maximum of grouped data and minima and records described maximum and minima putting in order in grouped data respectively.
7. control method according to claim 5, it is characterised in that: include step,
From described grouped data, parallel decimation goes out the maximum of grouped data and minima and records described maximum and minima putting in order in grouped data respectively.
8. the control method according to claim 5,6 or 7, it is characterised in that: include step,
Relatively more described maximum and minima putting in order in grouped data, and be ranked according to result of the comparison described maximum and minima sequencing in described video data.
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| CN102263559A (en) * | 2011-07-26 | 2011-11-30 | 昆明理工大学 | Long data compression processing method applicable to minitype drawing interface |
| CN103869121B (en) * | 2012-12-14 | 2017-11-28 | 北京普源精电科技有限公司 | A kind of Waveform display apparatus and method |
| CN102998500B (en) * | 2012-12-24 | 2015-05-13 | 电子科技大学 | Waveform data processing method for digital three-dimensional oscilloscope |
| CN102998501B (en) * | 2012-12-28 | 2015-06-10 | 福建利利普光电科技有限公司 | Method for achieving data compression of digital oscilloscope based on field programmable gata array |
| CN104793032B (en) * | 2015-04-29 | 2017-09-26 | 电子科技大学 | Digital three-dimensional gathers the vector mapping method of waveform |
| CN106841729B (en) * | 2016-12-14 | 2019-09-03 | 东南大学 | A kind of digital fluorescence oscilloscope waveform shows the conversion calculation method of data |
| CN107644632B (en) * | 2017-08-17 | 2021-03-30 | 北京英夫美迪科技股份有限公司 | Audio downmix and waveform generation method and apparatus |
| CN109975589A (en) * | 2017-12-27 | 2019-07-05 | 北京金风科创风电设备有限公司 | Data processing method and device, display device and computer readable storage medium |
| CN111308147B (en) * | 2019-12-09 | 2021-06-04 | 电子科技大学 | Data acquisition device based on information entropy |
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