CN104820120A - Method and device for improving signal triggering precision - Google Patents
Method and device for improving signal triggering precision Download PDFInfo
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- CN104820120A CN104820120A CN201510187949.1A CN201510187949A CN104820120A CN 104820120 A CN104820120 A CN 104820120A CN 201510187949 A CN201510187949 A CN 201510187949A CN 104820120 A CN104820120 A CN 104820120A
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Abstract
The invention discloses a method and device for improving signal triggering precision. The method includes: a signal reconstruction step in which a signal containing triggering data is obtained in a triggering data extraction step and signal reconstruction is performed, so as to improve the equivalent sampling rate of the signal; and a triggering search step in which triggering search is perform on the signal containing the triggering data reconstructed in the signal reconstruction step and a signal containing triggering correction value data is output. Before triggering search is performed, signal reconstruction is performed on the signal containing the triggering data first, thereby enabling signal triggering precision not to be poorer with reduction of the sampling rate. The invention realizes a method and device which are high in triggering precision, short in consumed time and low in cost.
Description
Technical field
The application relates to Electronic Testing fields of measurement, particularly relates to a kind of method and apparatus improving signal triggering precision.
Background technology
Measure occasion in Electronic Testing, engineers often needs the problems such as the shake of concern measured signal, determines the stability of signal itself with this.And as the surveying instrument of observation signal as oscillograph etc., the triggering precision of its signal just becomes very important, because when the shake with measuring-signals such as oscillographs, if the signal triggering precision of oscillograph itself is just bad, will introduce and trigger shipment, thus measurement result also out of true.
Technical scheme as shown in Figure 1, the program adopt traditional time-digital conversion circuit (TDC) realizes the triggers corrective of signal.First the simulating signal of input and simulation comparative level are compared in analog comparator, obtain high level or the low level (digital level) of serial, with the time of giving-data-converting block; Then time-data-converting block utilize time-digital conversion circuit realizes the calculating of triggers corrective value; Last signal triggers corrective module utilize time-data-converting block export corrected value the digital signal collected by data acquisition and control module is corrected, and by correction result export to follow-up display module.Fig. 1 based on time-oscillograph of digital conversion technique, signal triggering precision be limited to time-conversion accuracy of digital conversion circuit (TDC) and switching time, adopt this technology to have many shortcomings to the triggers corrective realizing signal:
1, time-switching time of digital conversion circuit (TDC) is long, completing once conversion needs several delicate time, and then affects the capture rate of signal;
2, time-conversion accuracy of digital conversion circuit (TDC) is limited because conversion accuracy is limited to the frequency of used processing clock, and this clock frequency is general all at about 100MHz, and therefore conversion accuracy often can only arrive ns;
3, due to time-digital conversion circuit (TDC) is mimic channel, therefore cost is higher.
Summary of the invention
In order to solve traditional signal triggers corrective length consuming time, precision is low and cost is high problem, the application provides a kind of method and apparatus improving signal triggering precision.
According to the first aspect of the application, the application provides a kind of method improving signal triggering precision, comprises the following steps:
Simulating signal analog to digital conversion step to be measured: receive simulating signal to be measured, export after converting thereof into digital signal to be measured;
Trigger data extraction step: extract a signal comprising trigger data in the digital signal exported from simulating signal analog to digital conversion step to be measured and to go forward side by side row cache;
Signal reconstruction step: obtain in trigger data extraction step and comprise the signal of trigger data and signal reconstruction carried out to it, to improve the equivalent sampling rate of this signal;
Triggering searches step: the signal comprising trigger data after reconstruct in signal reconstruction step is carried out to triggering searches and exports the signal that comprises triggers corrective Value Data;
Digital signal acquiring step to be measured: gather and store the digital signal exported in simulating signal analog to digital conversion step to be measured;
Signal triggers corrective step: obtain the digital signal stored in digital signal acquiring step to be measured, and with the signal comprising triggers corrective Value Data exported in triggering searches step, signal triggers corrective is carried out to the digital signal of described acquisition.
More preferably, the method for above-mentioned raising signal triggering precision also comprises digital triggering step: extract trigger pip in the digital signal exported from simulating signal analog to digital conversion step to be measured; This trigger pip for controlling extraction and the buffer memory of the signal comprising trigger data in trigger data extraction step, and for the collection that controls digital signal in digital signal acquiring step to be measured and storage.
According to the second aspect of the application, the application provides a kind of device improving signal triggering precision, it is characterized in that, comprising:
Analog-to-digital conversion module (1), for receiving simulating signal to be measured, exports after converting thereof into digital signal to be measured;
Trigger data extraction module (2), its input end is connected with the output terminal of analog-to-digital conversion module (1), to go forward side by side row cache for extracting a signal comprising trigger data in the digital signal that exports from analog-to-digital conversion module (1);
Signal reconstruction module (3), its input end is connected with the output terminal of trigger data extraction module (2), for obtaining the signal comprising trigger data of buffer memory in trigger data extraction module (2) and carrying out signal reconstruction to it, to improve the equivalent sampling rate of this signal;
Triggering searches module (4), its input end is connected with the output terminal of signal reconstruction module (3), and the signal comprising trigger data for exporting signal reconstruction module (3) carries out triggering searches and exports the signal that comprises triggers corrective Value Data;
Digital signal acquiring module (5), its input end is connected with the output terminal of analog-to-digital conversion module (1), for gathering and storing the digital signal that analog-to-digital conversion module (1) exports;
Signal triggers corrective module (6), its input end is connected with the output terminal of triggering searches module (4), digital signal acquiring module (5), for obtaining the signal comprising triggers corrective Value Data that triggering searches module (4) exports and the digital signal that digital signal acquiring module (5) stores, and with described in comprise triggers corrective Value Data signal signal triggers corrective is carried out to described digital signal.
More preferably, the device of above-mentioned raising signal triggering precision, also comprise digital triggering module (7), its input end is connected with the output terminal of analog-to-digital conversion module (1), output terminal and trigger data extraction module (2), the input end of digital signal acquiring module (5) is connected, for extracting trigger pip in the digital signal that exports from analog-to-digital conversion module (1) and exporting to trigger data extraction module (2), digital signal acquiring module (5), described trigger pip is for controlling trigger data extraction module (2) to the extraction of signal and the buffer memory that comprise trigger data, and for control figure signal acquisition module (5) to the collection of digital signal and storage.
The beneficial effect of the application is:
Before carrying out triggering searches, first signal reconstruction is carried out to the signal comprising trigger data, thus signal triggering precision can not be deteriorated along with the reduction of sampling rate; The application additionally uses digital triggering, and consuming time short, precision is high, and cost is low.
Accompanying drawing explanation
Fig. 1 be tradition based on time-a kind of oscillograph of digital conversion technique;
Fig. 2 is the schematic diagram of the method for the raising signal triggering precision of a kind of embodiment of the application;
Fig. 3 is the structural representation of the device of the raising signal triggering precision of a kind of embodiment of the application.
Embodiment
By reference to the accompanying drawings the application is described in further detail below by embodiment.
Please refer to Fig. 1, present embodiment discloses a kind of method improving signal triggering precision, comprise the following steps:
Simulating signal analog to digital conversion step S01 to be measured: receive simulating signal to be measured, export after converting thereof into digital signal to be measured.
Digital triggering step S102: extract trigger pip in the digital signal exported from simulating signal analog to digital conversion step to be measured.This trigger pip is a digital trigger signal, and triggering mode is digital triggering, and it can obtain required data and produce a trigger pip by algorithm from digital signal to be measured.
Trigger data extraction step S103: to go forward side by side row cache according to extracting a signal comprising trigger data in the digital signal that the trigger pip in digital triggering step S102 exports from simulating signal analog to digital conversion step to be measured.
Signal reconstruction step S104: obtain in trigger data extraction step and comprise the signal of trigger data and signal reconstruction carried out to it, to improve the equivalent sampling rate of this signal.
Triggering searches step S105: the signal comprising trigger data after reconstruct in signal reconstruction step is carried out to triggering searches and exports the signal that comprises triggers corrective Value Data.Triggering searches is carried out to the signal comprising trigger data after reconstruct, particularly, be to this reconstruct after the signal comprising trigger data carry out interpolation processing, and the data relative offset value taking a kind of level manner of comparison to calculate each frame after interpolation to comprise the signal of trigger data, this relativity shift value contains the information of triggers corrective Value Data.
Digital signal acquiring step S106 to be measured: store the digital signal exported in simulating signal analog to digital conversion step to be measured according to the trigger pip collection in digital triggering step S102.
Signal triggers corrective step S107: obtain the digital signal stored in digital signal acquiring step to be measured, and with the signal comprising triggers corrective Value Data exported in triggering searches step, signal triggers corrective is carried out to the digital signal of described acquisition.
Step display S108: the digital signal through signal triggers corrective is shown and observes for user.
Correspondingly, please refer to Fig. 2, be a kind of device improving signal accuracy of the application, comprise:
Analog-to-digital conversion module 1, for receiving simulating signal to be measured, exports after converting thereof into digital signal to be measured;
Trigger data extraction module 2, its input end is connected with the output terminal of analog-to-digital conversion module 1, to go forward side by side row cache for extracting a signal comprising trigger data in the digital signal that exports from analog-to-digital conversion module 1;
Signal reconstruction module 3, its input end is connected with the output terminal of trigger data extraction module 2, for obtaining the signal comprising trigger data of buffer memory in trigger data extraction module 2 and carrying out signal reconstruction to it, to improve the equivalent sampling rate of this signal;
Triggering searches module 4, its input end is connected with the output terminal of signal reconstruction module 3, and the signal comprising trigger data for exporting signal reconstruction module 3 carries out triggering searches and exports the signal that comprises triggers corrective Value Data;
Digital signal acquiring module 5, its input end is connected with the output terminal of analog-to-digital conversion module 1, for gather and store analog-to-digital conversion module 1 export digital signal;
Signal triggers corrective module 6, its input end is connected with the output terminal of triggering searches module 4, digital signal acquiring module 5, for the digital signal that the signal comprising triggers corrective Value Data and digital signal acquiring module 5 that obtain triggering searches module 4 output store, and with the signal that this comprises triggers corrective Value Data, signal triggers corrective is carried out to digital signal.
Display module 8, its input end is connected with the output terminal of signal triggers corrective module 6, and the digital signal through signal triggers corrective exported for Received signal strength triggers corrective module 6 also carries out showing observing for user.Certainly, before showing this digital signal through signal triggers corrective, as required, determine to want the process it being carried out to some necessity, the waveform convergent-divergent etc. of digital signal like this.
In addition, the device of this raising signal accuracy can also comprise digital triggering module 7, its input end is connected with the output terminal of analog-to-digital conversion module 1, output terminal and trigger data extraction module 2, the input end of digital signal acquiring module 5 is connected, for extracting trigger pip in the digital signal that exports from analog-to-digital conversion module 1 and exporting to trigger data extraction module 2, digital signal acquiring module 5, trigger pip is for controlling trigger data extraction module 2 to the extraction of signal and the buffer memory that comprise trigger data, and for the collection of control figure signal acquisition module 5 pairs of digital signals and storage.
It is more than the method and apparatus detailed description of the raising signal triggering precision of the application.
The application, before triggering searches, directly extracts the signal comprising trigger data, and carries out signal reconstruction to it, to improve the equivalent sampling rate that this comprises the signal of trigger data from the digital signal after analog-to-digital conversion module 1 conversion; Again triggering searches is carried out to the signal comprising trigger data after this reconstruct, precision can be obtained far away higher than the triggers corrective Value Data of analog-to-digital conversion module 1 sample frequency.Finally again the signal comprising this triggers corrective Value Data is exported to signal triggers corrective module 6, thus obtain the high output signal of triggering precision.This utilizes the method for carrying out signal reconstruction without down-sampled data, make signal triggering precision can not subject the reduction of sampling rate and be deteriorated, and bring up to this precision of the equivalent sampling clock period after signal reconstruction by this precision of the sampling clock cycle of analog-to-digital conversion module 1.
In above process, before triggering searches, carried out signal reconstruction, greatly can improve the precision of triggering searches, thus solve conventional trigger precision with sampling rate reduce and be deteriorated problem.
Meanwhile, triggering searches for be the signal comprising trigger data, instead of Wave data.If triggering searches for the digital signal to be measured (namely through the Wave data signal of triggers corrective) being through certain triggers corrective, when trigger point not observe its device as in oscillographic screen ranges time, just may cause searching effective trigger point, thus cause stablizing triggering.As mentioned above, triggering searches for be the signal comprising trigger data, instead of Wave data signal, solve trigger along not in screen ranges time the triggering searches problem that cannot search for.The application directly stores the original sampling data near triggered time point, and therefore, no matter level triggers somewhere, can realize stable triggering.And the triggering searches of the application utilizes the raw data triggered near some effective time to carry out.
In addition, what the application adopted is digital triggering, solves traditional analog triggering method and device length consuming time, precision is low and cost is high problem.
Above content is the further description done the application in conjunction with concrete embodiment, can not assert that the concrete enforcement of the application is confined to these explanations.For the application person of an ordinary skill in the technical field, under the prerequisite not departing from the present application design, some simple deduction or replace can also be made.
Claims (6)
1. improve a method for signal triggering precision, it is characterized in that, comprise the following steps:
Simulating signal analog to digital conversion step to be measured: receive simulating signal to be measured, export after converting thereof into digital signal to be measured;
Trigger data extraction step: extract a signal comprising trigger data in the digital signal exported from simulating signal analog to digital conversion step to be measured and to go forward side by side row cache;
Signal reconstruction step: obtain in trigger data extraction step and comprise the signal of trigger data and signal reconstruction carried out to it, to improve the equivalent sampling rate of this signal;
Triggering searches step: the signal comprising trigger data after reconstruct in signal reconstruction step is carried out to triggering searches and exports the signal that comprises triggers corrective Value Data;
Digital signal acquiring step to be measured: gather and store the digital signal exported in simulating signal analog to digital conversion step to be measured;
Signal triggers corrective step: obtain the digital signal stored in digital signal acquiring step to be measured, and with the signal comprising triggers corrective Value Data exported in triggering searches step, signal triggers corrective is carried out to the digital signal of described acquisition.
2. the method improving signal triggering precision as claimed in claim 1, is characterized in that, also comprise digital triggering step: extract trigger pip in the digital signal exported from simulating signal analog to digital conversion step to be measured; This trigger pip for controlling extraction and the buffer memory of the signal comprising trigger data in trigger data extraction step, and for the collection that controls digital signal in digital signal acquiring step to be measured and storage.
3. the method improving signal triggering precision as claimed in claim 1, is characterized in that, also comprise step display: show the digital signal through signal triggers corrective and observe for user.
4. improve a device for signal triggering precision, it is characterized in that, comprising:
Analog-to-digital conversion module (1), for receiving simulating signal to be measured, exports after converting thereof into digital signal to be measured;
Trigger data extraction module (2), its input end is connected with the output terminal of analog-to-digital conversion module (1), to go forward side by side row cache for extracting a signal comprising trigger data in the digital signal that exports from analog-to-digital conversion module (1);
Signal reconstruction module (3), its input end is connected with the output terminal of trigger data extraction module (2), for obtaining the signal comprising trigger data of buffer memory in trigger data extraction module (2) and carrying out signal reconstruction to it, to improve the equivalent sampling rate of this signal;
Triggering searches module (4), its input end is connected with the output terminal of signal reconstruction module (3), and the signal comprising trigger data for exporting signal reconstruction module (3) carries out triggering searches and exports the signal that comprises triggers corrective Value Data;
Digital signal acquiring module (5), its input end is connected with the output terminal of analog-to-digital conversion module (1), for gathering and storing the digital signal that analog-to-digital conversion module (1) exports;
Signal triggers corrective module (6), its input end is connected with the output terminal of triggering searches module (4), digital signal acquiring module (5), for obtaining the signal comprising triggers corrective Value Data that triggering searches module (4) exports and the digital signal that digital signal acquiring module (5) stores, and with described in comprise triggers corrective Value Data signal signal triggers corrective is carried out to described digital signal.
5. the device improving signal triggering precision as claimed in claim 4, it is characterized in that, also comprise digital triggering module (7), its input end is connected with the output terminal of analog-to-digital conversion module (1), output terminal and trigger data extraction module (2), the input end of digital signal acquiring module (5) is connected, for extracting trigger pip in the digital signal that exports from analog-to-digital conversion module (1) and exporting to trigger data extraction module (2), digital signal acquiring module (5), described trigger pip is for controlling trigger data extraction module (2) to the extraction of signal and the buffer memory that comprise trigger data, and for control figure signal acquisition module (5) to the collection of digital signal and storage.
6. the device improving signal triggering precision as claimed in claim 4, it is characterized in that, also comprise a display module (8), its input end is connected with the output terminal of signal triggers corrective module (6), and the digital signal through signal triggers corrective exported for Received signal strength triggers corrective module (6) also carries out showing observing for user.
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Address after: 518000 Guangdong Province, Baoan District, Baoan District, Xin'an Street, Xingdong Community, 68 District, Antongda Industrial Factory Area, 4 factories, 3 floors, 5 office buildings, 1-3 floors Patentee after: Shenzhen dingyang Technology Co., Ltd Address before: Shenzhen City, Guangdong province Baoan District 518000 District 68 road left three Antongda Industrial Park, 4 floor Patentee before: Shenzhen Siglent Technologies Co., Ltd. |