CN102466747A - Measurement data compression display device and control method thereof - Google Patents

Abstract

A measurement data compression display device and a control method thereof, the device comprising a data acquisition module (101) for acquiring measurement data (104), a data compression module (102) for grouping the measurement data (104) and extracting display data (105) from the grouped measurement data, and a data display module (103) for generating a display waveform (106) based on the display data (105), wherein the data compression module (102) can extract the maximum value and the minimum value of the grouped data from the grouped data, and form the display data (105) based on the maximum value and the minimum value and the arrangement order of the maximum value and the minimum value in the grouped data. The waveform (106) displayed by the measurement data compression display device of the present invention can accurately reflect the order relationship between the maximum value and the minimum value in each grouped data, thereby accurately maintaining the characteristics of each grouped data.

Description

A measurement data compression display device and its control method

technical field

A measurement data compression display device and a control method thereof of the present invention relate to the field of measurement devices that use waveforms to display measured electrical signals.

Background technique

In the prior art, there are many devices for displaying the measured electrical signal in the form of a waveform, among which the most common is a digital oscilloscope, and of course, some digital multimeters and data acquisition systems also have devices that can display the measured signal in a waveform Function.

These devices that can display the measured electrical signal in a waveform often need to solve the problem of how to compress a large number of measurement signals into a limited display signal, so that the measured signal can be displayed in a waveform on a display screen with limited pixels.

For example, when a digital oscilloscope collects data, the amount of measurement data collected each time is very large. Before saving it in the cyclic memory of the digital oscilloscope, it is necessary to compress the collected measurement data. Another example , when the digital multimeter that can display the measurement data in the form of waveform display is used for data collection, if the data volume of the collected measurement data is greater than the number of pixels in the horizontal axis direction of its display screen, the measurement data should also be compressed.

The currently used data compression methods are limited, such as maximum value extraction method, minimum value extraction method, random extraction method, average value extraction method, etc., but each of these solutions has some problems, such as:

Maximum value extraction method: it realizes data compression by dividing the measured data into multiple grouped data, and then extracting the maximum value from it. The waveform formed by this compression method cannot truly reproduce the minimum value information of the grouped data, so that Waveform distortion.

Minimum value extraction method: It is to realize data compression by dividing the measurement data into multiple grouped data, and then extracting the minimum value from them. The waveform formed by this compression method cannot truly reproduce the maximum value information of the grouped data, so that Waveform distortion.

Average value extraction method: divide the measurement data into multiple group data, calculate the average value of each group data, and then use the average value to form compressed data. The waveform formed by this compression method also cannot truly reproduce the group data. The maximum and minimum information of the data will also distort the waveform.

In order to solve the above problems, the application number 200710089620, the Chinese invention patent titled "Waveform Compression and Display", discloses a method of using multiple measurement data compression modes at the same time, for example, using the maximum value and minimum value selection method at the same time Compress the measurement data, and then display the waveform obtained by the maximum value and minimum value sampling method in an alternate display mode. The waveform that the user sees is formed by the superposition of the above two waveforms.

Although the compression method disclosed in the application number 200710089620 solves the information loss problem existing in a single compression method, it introduces a new problem at the same time, that is, displaying different compressed data corresponding to the same measurement data multiple times will greatly increase the waveform capture rate. Reduced, and, when the waveform corresponding to the maximum value data and the waveform corresponding to the minimum value data are alternately displayed, the sequence relationship between the maximum value and the minimum value in each group data cannot be correctly reflected, and errors are prone to occur Interpret the situation of the measured data.

Contents of the invention

The purpose of the present invention is to provide a measurement data compression display device that can correctly display the sequence relationship between the maximum value and the minimum value in each grouped data.

The measurement data compression display device includes: a data acquisition module for collecting measurement data; a data compression module for grouping the measurement data to generate group data, and from the group measurement data extract the display data; a data display module is used to generate a display waveform according to the display data; wherein the data compression module is used to extract the group data from the group data The maximum value and the minimum value, and according to the maximum value and the minimum value, and the arrangement order of the maximum value and the minimum value in the grouping data, form the display data.

According to an embodiment of the present invention, the data compression module in the compressed display device of the present invention can be used to serially extract the maximum and minimum values of the packet data from the packet data, and Respectively record the arrangement order of the maximum value and minimum value in the grouped data;

According to an embodiment of the present invention, the data compression module in the compressed display device of the present invention can also be used to extract the maximum value and the minimum value of the grouped data in parallel from the grouped data, and Respectively record the arrangement order of the maximum value and minimum value in the grouped data;

According to an embodiment of the present invention, the data compression module in the compressed display device of the present invention can also be used to compare the arrangement order of the maximum and minimum values in the grouped data, and according to the comparison result Arranging the order of the maximum value and the minimum value in the display data.

The waveform displayed by the measurement data compression display device of the present invention can accurately reflect the sequence relationship between the maximum value and the minimum value in each group data, thereby accurately maintaining the characteristics of each group data, especially suitable for Waveform magnification analysis or other conditions that can clearly see the sequence relationship between the maximum value and minimum value in each group data, and has the characteristics of easy implementation.

The purpose of the present invention is also to provide a control method of a measurement data compression display device that can correctly display the sequence relationship between the maximum value and the minimum value in each grouped data.

The control method of a measurement data compression display device includes the steps of:

From the grouped data, extract the maximum value and minimum value of the grouped data, and according to the maximum value and minimum value, and the order of arrangement of the maximum value and minimum value in the grouped data, form the display data described above.

According to an embodiment of the present invention, the method described in the present invention may include the steps of,

From the grouped data, serially extracting the maximum value and the minimum value of the grouped data, and respectively recording the arrangement order of the maximum value and the minimum value in the grouped data;

According to yet another embodiment of the present invention, the method described in the present invention may further include the steps of,

From the grouped data, extracting the maximum value and the minimum value of the grouped data in parallel, and respectively recording the arrangement order of the maximum value and the minimum value in the grouped data;

According to yet another embodiment of the present invention, the method described in the present invention may further include the steps of,

Comparing the arrangement order of the maximum value and the minimum value in the grouped data, and arranging the sequence of the maximum value and the minimum value in the display data according to the comparison result.

The control method of the measurement data compression display device according to the present invention can make the displayed waveform accurately reflect the sequence relationship between the maximum value and the minimum value in each group data, thereby accurately maintaining the characteristics of each group data, especially It is suitable for waveform amplification analysis or other situations where the sequence relationship between the maximum value and minimum value in each group data can be clearly seen, and it has the characteristics of easy implementation.

Description of drawings

FIG. 1 is an explanatory view showing the structure of a measuring device 100 used in an embodiment of the present invention.

FIG. 2 is a further structural explanatory diagram of the data compression unit 102 in the measurement device 100 .

FIG. 3 is an illustrative illustration of the measurement data 301 , 302 , 303 , 304 in the packet data 204 .

FIG. 4 is an illustrative illustration of the display data 105 formed after the measurement data 301 , 302 , 303 , and 304 in the grouped data 204 are extracted and sorted by the maximum and minimum values.

FIG. 5 is an explanatory diagram of the lottery module 202 .

FIG. 6 is an illustrative diagram of a structure of the drawing module 202 .

FIG. 7 is an illustration diagram illustrating yet another structure of the drawing module 202 .

FIG. 8 is a step-by-step explanatory diagram of a data processing step 800 performed by the data compression unit 102 .

FIG. 9 is a diagram illustrating the structure of a digital multimeter to which the data processing step 800 is applied.

Detailed ways

In the selected first embodiment of the present invention, a measuring device 100 is selected, see FIG. 1 .

The measurement device 100 includes a data acquisition unit 101, a data compression unit 102 and a waveform display unit 103, wherein the data acquisition unit 101 is used to measure and generate measurement data 104, and the data compression unit 102 is used to compress the measurement data 104 and generate display data 105 , the waveform display component 103 includes a display screen 106 , configured to map the display data 105 onto the display screen 106 , and form a waveform corresponding to the display data 105 on the display screen 106 .

In this embodiment, the data compression component 102 includes a grouping module 201 , a selection module 202 and a sorting module 203 , see FIG. 2 .

The grouping module 201 is used to group the measurement data 104 according to the data compression ratio to generate the grouped data 204, and the extraction module 202 is used to extract the maximum value and the minimum value of the grouped data from the grouped data 204, And record the sequence information of the maximum and minimum values in the grouped data.

The sorting module 203 is configured to sort the maximum value and the minimum value according to the sequence information of the maximum value and the minimum value in the grouping data 204 , so as to form the display data 105 .

Specifically speaking, referring to FIG. 2 and FIG. 3 , for example, when the data compression ratio is 2:1, the grouping module 201 groups the measurement data 104 into a plurality of grouped data 204 in sequence. When grouping, every 4 measurement data are divided into a group data 204, and then the calculation of the maximum value and the minimum value is performed for each group data 204 by the sampling module 202, such as the group data 204 is composed of 4 measurement data 301, 302 , 303, and 304, the sampling module 202 calculates that the maximum value is the measurement data 302, and the minimum value is the measurement data 304, and also records the sorting information of the measurement data 302 and the measurement data 304, and accordingly, in In the display data 105, the position of the scheduled measurement data 302 is at the front, and the position of the measurement data 304 is at the rear, see FIG. 4 .

As an example, with reference to Fig. 2 and Fig. 3, in this embodiment, when the data compression ratio is 4:1, the grouping module 201 can divide every 8 measurement data into a grouping data 204, when the data compression ratio When it is 8:1, the grouping module 201 can divide every 16 measurement data into a grouping data 204, and so on, when the compression ratio is L:1, the grouping module 201 can make every 2L measurement data into one The grouped data 204 is then calculated by the sampling module 202 for each grouped data 204 with a maximum value and a minimum value.

As an example, there are many ways to record the sorting information of the maximum value and the minimum value. For example, in this example, the sorting position of the maximum value in the packet data 204 can be recorded as 2, and the sorting position of the minimum value is 4. Thus, it is calculated that the sorting position of the largest value is first, and the sorting position of the smallest value is later. For another example, only based on the order in which the minimum value and the maximum value are generated, without specifically calculating the specific position of the maximum value and the minimum value in the grouped data, the sorting information of the maximum value and the minimum value can also be given.

In this embodiment, the data compression unit 102 is realized by building a hardware circuit, and the hardware may also be realized by a programmable device, such as FPGA, CPLD device, or may be realized by a customized device ASIC circuit.

In this embodiment, the grouping module 201 can be realized by using a counter, and a specified amount of data can be grouped into one group by counting the counter.

The sampling module 202 may be composed of a maximum value extractor 501 and a minimum value extractor 502 arranged in parallel, refer to FIG. 5 . Wherein the maximum value extractor 501 and the minimum value extractor 502 are used to receive packet data 204 in parallel, respectively calculate the maximum value and minimum value in each packet data 204, and the maximum and minimum values in the packet data 204 Finally, the calculation results are output to the sorting module 203, and the sorting module 203 is used to arrange the sequence of the maximum value and the minimum value according to the output of the maximum value extractor 501 and the minimum value extractor 502, forming Data 105 is displayed.

As an example, the sampling module 202 may also be composed of a maximum value extractor 601, a minimum value extractor 602, and a counter 603 arranged in series, as shown in FIG. 6 . Each measurement data in the packet measurement data 204 passes through the maximum value extractor 601 and the minimum value extractor 602 in turn, and the maximum value extractor 601 and the minimum value extractor 602 are used to calculate the received measurement data Whether it is the maximum and minimum values in each packet data 204, and the position of the maximum and minimum values in the packet data 204. The counter 603 wherein is used to judge whether to complete the calculation of the maximum value and the minimum value of all data in the packet data 204 by counting the number of cycles, and when not completed, continue to calculate the next measurement data in the packet data 204, when After the calculation of all the data in the grouped data 204 is completed, the calculation results, that is, the calculated maximum and minimum values, and the position information of the maximum and minimum values in the grouped data 204 are output to the sorting module 203 . The sorting module 203 is used to form the display data 105 according to the outputs of the maximum value extractor 601 and the minimum value extractor 602 .

As another example, the sampling module 202 can also be composed of a maximum value extractor 701 and a minimum value extractor 702 connected in series. Referring to FIG. 7, the packet measurement data 204 first enters the maximum value extractor 701, Firstly, the maximum value in each packet data 204 and the position of the maximum value in the packet data 204 are calculated. Then the grouped data 204 enters the minimum value extractor 702 to calculate the minimum value in each grouped data 204 and the position of the minimum value in the grouped data 204 . Finally, the selection module 202 outputs the calculation result, that is, the calculated maximum and minimum values, and the position information of the maximum and minimum values in the grouped data 204 to the sorting module 203 . The sorting module 203 is used to form the display data 105 according to the outputs of the maximum value extractor 701 and the minimum value extractor 702 .

In this embodiment, the sorting module 203 may include a comparator, which is used to calculate the size relationship of the sequence data of the maximum and minimum values output by the sampling module 202 in the grouping data 204, and calculate the The order of the maximum value and minimum value in the group data 204, and accordingly, sort the maximum value and minimum value to form the display data 105.

As an example, the data compression unit 102 described in this embodiment may also be composed of a DSP or other types of control devices. For the data processing step 800 performed by the data compression component 102, refer to FIG. 2 and FIG. 8 in conjunction. Data processing steps 800 include:

Read in N points according to the compression ratio Step 801:

It is used to read in data according to a predetermined data compression ratio, so that every D data forms a packet data.

If the current compression ratio is 2:1, then D=4;

If the compression ratio is 4:1, then D=8,

And so on, when the compression ratio is L:1, N=2L.

Assign the value of the first point to MAX and MIN step 802:

It is used to assign the first measurement data value in the grouped data 204 to the maximum value variable MAX and the minimum value variable MIN.

Set the counter T to be 0, and the sorting flag bSort to be 0. Step 803:

For initialization, make the counter variable T=0 and the sort flag variable bSort=0.

Assign the nth point in the data to TEMP step 804:

It is used to take out the nth measurement data in the packet data 204 and assign it to the temporary variable TEMP for comparison with the maximum value variable MAX and the minimum value variable MIN.

TEMP > MAX? Step 805:

It is used to compare the temporary variable TEMP with the maximum value variable MAX to determine whether it is greater than the maximum value variable MAX.

If the temporary variable TEMP is greater than the maximum variable MAX, execute MAX=TEMP, bSort=1 step 806, otherwise, execute TEMP<MIN? Step 807.

MAX=TEMP, bSort=1 Step 806:

If the temporary variable TEMP is greater than the maximum value variable MAX, make the value of the maximum value variable MAX equal to the value of the temporary variable TEMP, and set the sort flag bSort to 1 at the same time. Then, execute TEMP<MIN? Step 807.

TEMP<MIN? Step 807:

Compare the temporary variable TEMP with the minimum variable MIN to determine whether it is smaller than the minimum variable MIN.

If the temporary variable TEMP is smaller than the minimum value variable MIN, execute MIN=TEMP, bSort=0 step 808, otherwise execute n=n+1 step 809.

MIN=TEMP, bSort=0 Step 808:

If the temporary variable TEMP is smaller than the minimum value variable MIN, update the value of the minimum value variable MIN to be equal to the value of the temporary variable TEMP, and set the sort flag to 0 at the same time. Then execute n=n+1 step 809 .

n=n+1 step 809:

Increment the counter variable T by 1.

n<N? Step 810:

T and N are compared to see if the last measurement in packet data 204 has been calculated.

When T<N, that is, when the last measurement data in the packet data 204 has not been calculated, perform the step 804 of assigning the nth point in the data to TEMP again, otherwise perform bSort==0? Step 811.

bSort==0? Step 811:

Determine whether the sort flag bSort is 0.

When bSort is 0, execute MAX first and MIN later step 812 , otherwise execute MIN first and MAX later step 813 .

MAX comes first, MIN comes next Step 812:

If the sort flag bSort is 0, the maximum value variable MAX is sorted before the minimum value variable MIN to form the display signal 105 .

MIN comes first, MAX comes next Step 813:

If the sort flag bSort is 1, the minimum value variable MIN is sorted before the maximum value variable MAX to form the display signal 105 .

The extraction of N points completes step 814

for outputting the display signal 105

As an example, in this embodiment, the measuring device 100 can be a digital oscilloscope. With reference to FIG. Acquisition memory, the data acquisition memory mentioned here is also called cycle memory, which is used to save the measurement data collected by the data acquisition unit 101 at high speed, and provide display data for waveform display according to the trigger signal generated by the trigger unit. The data compression unit 102 is arranged between the AD conversion unit and the data acquisition memory, and is used to compress the measurement data output by the AD conversion unit, and output the compressed data to the data acquisition memory for Subsequent data processing and display processing.

As an example, in this embodiment, the measurement device 100 can also be another digital oscilloscope, which is different from the above-mentioned digital oscilloscope, and its data acquisition part 101 includes the measurement part and AD conversion part of the oscilloscope and a For the measurement data storage part for saving measurement data, the waveform display part 103 includes a display data storage part for storing display data for waveform display, and the data compression part 102 is arranged between the measurement data storage part and the display data storage part. Between the components, it is used to compress the measurement data in the measurement data storage component into display data.

As another example, in this embodiment, the measuring device 100 can also be a digital multimeter, and in the digital multimeter, the data acquisition unit 101 includes a measuring unit of the multimeter, an AD conversion unit and a The measurement data storage part for storing measurement data, the waveform display part 103 includes a display data storage part, and the waveform display part 103 is used to provide waveform display corresponding to the display data stored in the display data storage part. In this example, the data compression unit 102 is arranged between the measurement data storage unit and the display data storage unit, and is used to compress the measurement data in the measurement data storage unit and store them in the display data storage unit.

As another example, the measuring device 100 is another digital multimeter, which is different from the above-mentioned embodiments. In the digital multimeter, with reference to FIG. 9, the waveform display part 103 includes a real-time measurement data display Unit 901 and a compressed data display unit 902 display screen.

The real-time measurement data display unit 901 corresponds to a real-time measurement data storage 903 , the compressed data display unit 902 corresponds to a compressed data storage 905 , and a data compression component 906 is connected between the real-time measurement data storage 903 and the compressed data display unit 902 .

In this example, the real-time measurement data storage 903 is used to provide real-time display data for the real-time measurement data display unit 901 according to the measurement data 104 output by the data acquisition component 101, and the real-time measurement data display unit 901 is used to provide real-time display data according to the real-time measurement data storage 903 The provided real-time display data presents a display waveform 904 corresponding to the measurement data 104 in real time.

In this example, the data compression component 906 is used to compress the real-time display data stored in the real-time measurement data storage 903 and transmit the compressed data to the compressed data storage 905 .

In this example, the compressed data memory 905 is used to accumulate the compressed data output by the data compression unit 906 , and the compressed data display unit 902 is used to provide the corresponding waveform 906 according to the compressed data stored in the compressed data memory 905 .

In this illustration, the data compression component 906 is composed of a DSP device, and implements data compression by executing the data processing step 800 .

In this example, the data compression component 906 may also be composed of a programmable device such as FPGA.

Claims (8)

1. A measurement data compression display device, comprising: A data acquisition module for collecting measurement data; A data compression module, used to group the measurement data, generate group data, and extract display data from the group measurement data; A data display module, used to generate display waveforms according to the display data; It is characterized by: The data compression module is used to extract the maximum value and the minimum value of the packet data from the packet data, and according to the maximum value and the minimum value, and the maximum value and the minimum value in The sort order in the grouped data forms the display data. 2. The compression display device according to claim 1, characterized in that: The data compression module is used for serially extracting the maximum value and the minimum value of the packet data from the packet data, and respectively recording the arrangement order of the maximum value and the minimum value in the packet data. 3. The compression display device according to claim 1, characterized in that: The data compression module is used to extract the maximum value and the minimum value of the packet data in parallel from the packet data, and respectively record the sequence of arrangement of the maximum value and the minimum value in the packet data. 4. The compressed display device according to claim 1, 2 or 3, characterized in that: The data compression module is used to compare the arrangement order of the maximum value and the minimum value in the packet data, and arrange the sequence of the maximum value and the minimum value in the display data according to the comparison result . 5. A control method for a measurement data compression display device, It is characterized in that: comprising steps, From the grouped data, extract the maximum value and minimum value of the grouped data, and according to the maximum value and minimum value, and the order of arrangement of the maximum value and minimum value in the grouped data, form the display data described above. 6. The control method according to claim 5, characterized in that: comprising the steps of, From the grouped data, the maximum value and the minimum value of the grouped data are serially extracted, and the order of arrangement of the maximum value and the minimum value in the grouped data is respectively recorded. 7. The control method according to claim 5, characterized in that: comprising the steps of, From the grouped data, the maximum value and the minimum value of the grouped data are extracted in parallel, and the order of arrangement of the maximum value and the minimum value in the grouped data is respectively recorded. 8. The control method according to claim 5, 6 or 7, characterized in that it comprises the step of comparing the arrangement order of the maximum value and the minimum value in the packet data, and arranging the maximum value according to the comparison result. The order in which the values and minimum values appear in the displayed data.

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