CN104601142A - Filtering method, filter and flicker test system - Google Patents
Filtering method, filter and flicker test system Download PDFInfo
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- CN104601142A CN104601142A CN201310533120.3A CN201310533120A CN104601142A CN 104601142 A CN104601142 A CN 104601142A CN 201310533120 A CN201310533120 A CN 201310533120A CN 104601142 A CN104601142 A CN 104601142A
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Abstract
The invention discloses a filtering method, a filter and a flicker test system. The filtering method comprises the following steps: filtering an input signal respectively through a plurality of pre-generated low-order subfilters to generate filtering sub-signals corresponding to the low-order subfilters; adding the filtering sub-signals corresponding to the low-order subfilters to generate a filtering signal; and outputting the filtering signal. In the technical scheme of the filtering method, the filter and the flicker test system provided by the invention, corresponding filtering sub-signals are obtained by filtering the input signal respectively through the plurality of low-order subfilters in the filter, and the filtering signal is obtained by adding the filtering sub-signals. The filtering signal obtained through the filter is stable, and the filtering stability is enhanced, so that a correct filtering signal can be obtained.
Description
Technical field
The present invention relates to signal filtering technical field, particularly a kind of filtering method, filter and flicker test system.
Background technology
Voltage flicker is an important indicator of the quality of power supply, refers to the illumination flicker caused by voltage fluctuation, generally also comprises the visual sense reaction of human eye to this.The power of flickering is relevant with factors such as the waveform of fluctuation voltage, amplitude, frequencies.In recent years, along with a large amount of uses of wavy load (as the power electronic equipment etc. that arc furnace, rolling mill, electric locomotive, electric welding machine and high power pulse export), the extent of injury that flickering causes is more and more serious.The harm of flickering is mainly manifested in: cause houselights to glimmer, and makes people's visual fatigue even be difficult to stand and produce irritated mood; Cause motor speed unstable, affect electrical machinery life and product quality, crisis equipment safety operation; Make to be adversely affected to the more sensitive precision process process of voltage fluctuation or result of the test; Cause electronic equipment, computer system, the automatic work such as production control line and business automation equipment is abnormal or suffer damage and affect useful life; Make TV set image brightness frequent variations and vertical and horizontal amplitude variation etc.
For lowering the harm of flickering, need to test flickering signal.Fig. 1 is the structural representation of flicker test system in prior art, as shown in Figure 1, this flicker test system can comprise: the square examination filter 2 connected successively, high pass filter 3, low pass filter 1, diopter sense weighting filter 8, square low-pass first order filter 4 and analytic statistics module 5.Wherein, square examination filter 2 for carrying out square examination filtering process to input signal, and exports the input signal through square examination filtering process to high pass filter 3; High pass filter 3 for carrying out high-pass filtering process to input signal, and exports the input signal through high-pass filtering process to low pass filter 1; Low pass filter 1 generates filtering signal for carrying out low-pass filtering treatment to input signal, and exports the filtering signal through low-pass filtering treatment to diopter sense weighting filter 8; Diopter sense weighting filter 8 for carrying out visual degree sense weighted filtering process to filtering signal, and exports the filtering signal through visual degree sense weighted filtering process to square low-pass first order filter 4; Square low-pass first order filter 4 for carrying out a square first-order low-pass ripple process to filtering signal, and exports the filtering signal through square first-order low-pass ripple process to analytic statistics module 5; Analytic statistics module 5 carries out analytic statistics process for the filtering signal exported square low-pass first order filter 4, draws flickering signal.
At present, flicker test system is realized by hardware circuit or is realized by Labview filter function.According to IEC61000-4-15 standard, carry out in the process of filtering process at low pass filter 1 pair of input signal, need to use 6 rank Butterworth (Butterworse) filters that cut-off frequency is 35Hz to carry out filtering to input signal.The function expression of the input signal input of the process to be filtered of input is:
Input=sin (2*pi*20*t)+sin (2*pi*100*t)+sin (2*pi*200*t), wherein, sample frequency fs=100K, t=0,1/fs, 2/fs ..., 1, cut-off frequency ω
c=35Hz.The waveform of this input signal can as shown in Figure 2, and Fig. 2 is the oscillogram of input signal.Sliding-model control is carried out to 6 rank Butterworth filters, and directly carrying out filtering by 6 rank Butterworth filters after discretization to input signal draws filtering signal.Wherein, the transfer function of 6 rank Butterworth filters
Wherein, frequencies omega=2 π ω
c, s is complex variable.Fig. 3 is the oscillogram of the filtering signal drawn after 6 rank Butterworth filters after adopting discretization carry out filtering to input signal, and as shown in Figure 3, filtering signal becomes to be dispersed.
Inventor carries out in the process of flicker test utilizing flicker test system, finds that prior art at least exists following technical problem:
1) filtering signal exported due to filter becomes to be dispersed, and therefore filtering is unstable, cannot obtain correct filtering signal;
2) operation of Labview filter function needs Labview runtime environment, this Labview filter function cannot be transplanted in other system and run, and adopt hard-wired filter more cannot realize transplanting, cause the transplantability of this filter poor, thus make system integration difficulty large.
Summary of the invention
The invention provides a kind of filtering method, filter and flicker test system, for improving filter wave stability, and solving the problem of filter transplantability difference, facilitating the system integration.
For achieving the above object, the invention provides a kind of filtering method, comprising:
Respectively filtering is carried out to input signal by the multiple low order subfilters generated in advance, generate the filtering subsignal corresponding with described low order subfilter;
The filtering subsignal corresponding with described low order subfilter is added, generates filtering signal;
Export described filtering signal.
Alternatively, describedly respectively filtering is carried out to input signal by multiple low order subfilter and comprises:
Respectively filtering is carried out to described input signal by multiple low order subfilter simultaneously; Or
Respectively filtering is carried out to described input signal by multiple low order subfilter successively.
Alternatively, described respectively filtering is carried out to input signal by multiple low order subfilter before also comprise:
Filter parameter according to user's input determines higher order filter;
Described higher order filter is decomposed, generates described multiple low order subfilter.
Alternatively, described filter parameter comprises: the order of higher order filter, cut-off frequency and sampling period.
Alternatively, also comprise after the described multiple low order subfilter of described generation:
Sliding-model control is carried out to described multiple low order subfilter.
Alternatively, the order of described higher order filter comprises: 2 rank, rank to 8.
For achieving the above object, the invention provides a kind of filter, comprising:
Input module, for inputting input signal;
Filtration module, carrying out filtering to described input signal respectively for the multiple low order subfilters by generating in advance, generating the filtering subsignal corresponding with described low order subfilter;
Summation module, for being added by the filtering subsignal corresponding with described low order subfilter, generates filtering signal;
Output module, for exporting described filtering signal.
Alternatively, described filtration module comprises: multiple filtering submodule, and each described filtering submodule corresponds to a described low order subfilter;
Each described filtering submodule, carries out filtering by a described low order subfilter to input signal for performing simultaneously, generates the step of the filtering subsignal corresponding with described low order subfilter; Or by a described low order subfilter, filtering being carried out to input signal for performing successively, generating the step of the filtering subsignal corresponding with described low order subfilter.
Alternatively, also comprise:
Determination module, determines higher order filter for the filter parameter inputted according to user;
Decomposing module, for decomposing described higher order filter, generates described multiple low order subfilter.
Alternatively, described filter parameter comprises: order, cut-off frequency and sampling period.
Alternatively, also comprise:
Descretization module, for carrying out sliding-model control to described multiple low order subfilter.
Alternatively, the order of described higher order filter comprises: 2 rank, rank to 8.
For achieving the above object, the invention provides a kind of flicker test system, comprising: above-mentioned low pass filter.
The present invention has following beneficial effect:
In the technical scheme of filtering method provided by the invention, filter and flicker test system, filter carries out filtering to input signal respectively by multiple low order subfilter and draws corresponding filtering subsignal, and the addition of filtering subsignal is drawn filtering signal, the filtering signal adopting above-mentioned filter to draw is stablized, improve filter wave stability, thus correct filtering signal can be obtained.Can generate low order subfilter in advance, and this filter can independent operating, does not rely on other runtime environments, makes to run in this filter portable to other system, solve the problem of filter transplantability difference, thus reduce the integrated difficulty of system.Adopt multi-threading parallel process technology to carry out filtering operation to multiple low order subfilter simultaneously, when the data volume of input signal is larger, effectively can reduce operation time, improve operation efficiency.
Accompanying drawing explanation
Fig. 1 is the structural representation of flicker test system in prior art;
Fig. 2 is the oscillogram of input signal;
Fig. 3 is the oscillogram of the filtering signal drawn after 6 rank Butterworth filters after adopting discretization carry out filtering to input signal;
The flow chart of a kind of filtering method that Fig. 4 provides for the embodiment of the present invention one;
The flow chart of a kind of filtering method that Fig. 5 provides for the embodiment of the present invention two;
Fig. 6 is the schematic diagram of the step response after higher order filter discretization;
Fig. 7 is the schematic diagram of the step response in the present embodiment after low order subfilter discretization;
Fig. 8 is the schematic diagram adopting multi-threading parallel process technology input signal to be carried out to filtering;
Fig. 9 is the oscillogram of the filtering signal drawn after adopting the low order subfilter of the present embodiment to carry out filtering to input signal;
The structural representation of a kind of filter that Figure 10 provides for the embodiment of the present invention three;
The structural representation of a kind of flicker test system that Figure 11 provides for the embodiment of the present invention four.
Embodiment
For making those skilled in the art understand technical scheme of the present invention better, below in conjunction with accompanying drawing, filtering method provided by the invention, filter and flicker test system are described in detail.
The flow chart of a kind of filtering method that Fig. 4 provides for the embodiment of the present invention one, as shown in Figure 4, this filtering method comprises:
Step 101, the multiple low order subfilters passing through to generate in advance carry out filtering to input signal respectively, generate the filtering subsignal corresponding with low order subfilter.
In the present embodiment, can in advance higher order filter be decomposed, to generate multiple low order subfilter.
Step 102, the filtering subsignal corresponding with low order subfilter to be added, to generate filtering signal.
Step 103, output filtering signal.
In the technical scheme of the filtering method that the present embodiment provides, respectively filtering is carried out to input signal by multiple low order subfilter and draw corresponding filtering subsignal, and the addition of filtering subsignal is drawn filtering signal, the filtering signal adopting above-mentioned filtering method to draw is stablized, improve filter wave stability, thus correct filtering signal can be obtained.Realize can generating low order subfilter in advance in the scheme of this filtering method, and this filtering method can independent operating, do not rely on other runtime environments, make to run in this filtering method portable to other system, solve the problem of the filter transplantability difference realizing this filtering method, thus reduce the integrated difficulty of system.
The flow chart of a kind of filtering method that Fig. 5 provides for the embodiment of the present invention two, as shown in Figure 5, this filtering method comprises:
Step 201, according to user input filter parameter determine higher order filter.
Higher order filter can be the filter on more than 2 rank.Preferably, the order of higher order filter comprises: 2 rank, rank to 8, and that is, the filtering method that the present embodiment provides is preferably applied to the higher order filter on 2 rank, rank to 8.
User can select filter parameter according to the instructions for use of self and input this filter parameter, so that can select suitable higher order filter.In the present embodiment, filter parameter can comprise: order, cut-off frequency and sampling period.Wherein, order determines the order of the higher order filter that filtering adopts, and cut-off frequency and sampling period are the parameter of the transfer function building this higher order filter.In actual applications, filter parameter can also be the parameter of other type, will not enumerate herein.
In the present embodiment, be 6 rank, cut-off frequency ω with order
c=35Hz and sampling period
for example, then the transfer function of the higher order filter determined
Wherein, frequencies omega=2 π ω
c, s is complex variable.The transfer function of above-mentioned higher order filter is the transfer function of 6 rank Butterworth filters.
Step 202, higher order filter to be decomposed, generate multiple low order subfilter.
Particularly, the mode by factorization is decomposed higher order filter, generates multiple low order subfilter.
The Butterworth filter on 6 rank can be decomposed into the low order subfilter on 32 rank, then the transfer function G of 6 rank Butterworth filters is decomposed into transfer function G1, G2 and G3 of 32 rank subfilters, and G=G1+G2+G3, wherein,
Step 203, sliding-model control is carried out to multiple low order subfilter.
Fig. 6 is the schematic diagram of the step response after higher order filter discretization, and Fig. 7 is the schematic diagram of the step response in the present embodiment after low order subfilter discretization.Due to the limited precision of computer, when the sampling period is very little, after the direct discretization of higher order filter, the step response of its transfer function there will be the phenomenon of dispersing, be that 6 rank Butterworth filters do not carry out decomposing and the schematic diagram of step response after directly carrying out sliding-model control shown in Fig. 6, as can be seen from Figure 6, after the direct sliding-model control of 6 rank Butterworth filter, the step response of its transfer function becomes disperses.Figure 7 shows that 32 rank subfilters carry out the schematic diagram of the step response after sliding-model control, as can be seen from Figure 7, the step response of the transfer function G1 of first 2 rank subfilter becomes stable, the step response of the transfer function G2 of second 2 rank subfilter becomes stable, and the step response of the transfer function G3 of the 3rd 2 rank subfilters becomes stable.Shown in comparison diagram 6 and Fig. 7, after the direct discretization of higher order filter, the step response of its transfer function can become and disperse, and after higher order filter being resolved into multiple low order subfilter, the step response of the transfer function of each low order subfilter then becomes stable.
Step 204, input input signal.
Particularly, the function expression of the input signal input of the process to be filtered of input is:
Input=sin (2*pi*20*t)+sin (2*pi*100*t)+sin (2*pi*200*t), wherein, sample frequency fs=100K, t=0,1/fs, 2/fs ..., 1, cut-off frequency ω
c=35Hz.The waveform of this input signal can be as shown in Figure 2.
Step 205, respectively filtering is carried out to input signal by multiple low order subfilter, generate the filtering subsignal corresponding with low order subfilter.
Each low order subfilter all carries out filtering to input signal, to generate the filtering subsignal corresponding with low order subfilter.In the present embodiment, three 2 rank subfilters carry out filtering to input signal respectively, thus form the filtering subsignal s1 corresponding with first 2 rank subfilter, the filtering subsignal s2 corresponding with second 2 rank subfilter and the filtering subsignal s3 corresponding with the 3rd 2 rank subfilters respectively.Wherein, s1=input*G1, s2=input*G2, s3=input*G3.
Step 205 is realized by two kinds of modes in the present embodiment.First kind of way is: carry out filtering to input signal respectively by multiple low order subfilter successively, generates the filtering subsignal corresponding with low order subfilter.Or the second way is: carry out filtering to input signal respectively by multiple low order subfilter simultaneously, generate the filtering subsignal corresponding with low order subfilter.
When adopting first kind of way, step 205 specifically can comprise:
Step 2051, by first 2 rank subfilter, filtering is carried out to input signal, generate the filtering subsignal s1 corresponding with first 2 rank subfilter, wherein, s1=input*G1.
Step 2052, by second 2 rank subfilter, filtering is carried out to input signal, generate the filtering subsignal s2 corresponding with second 2 rank subfilter, wherein, s2=input*G2.
Step 2053, by the 3rd 2 rank subfilters, filtering is carried out to input signal, generate the filtering subsignal s3 corresponding with the 3rd 2 rank subfilters, wherein, s3=input*G3.
It should be noted that: the execution sequence of above-mentioned steps 2051, step 2052 and step 2053 can change arbitrarily.
When adopting the second way, step 205 specifically can comprise: perform above-mentioned steps 2051, step 2052 and step 2053 simultaneously.Fig. 8 is the schematic diagram adopting multi-threading parallel process technology input signal to be carried out to filtering, and as shown in Figure 8, three low order subfilters carry out filtering to input signal simultaneously, to draw three filtering subsignals.This kind of mode adopts multi-threading parallel process technology, carries out filtering operation to multiple low order subfilter simultaneously, when the data volume of input signal is larger, effectively can reduce operation time, improves operation efficiency.
Adopt above-mentioned two kinds of modes to realize in the process of step 205, each low order subfilter carries out composition filtering to input signal.Because G1, G2, G3 are three different 2 rank transfer functions, therefore each low order subfilter is carried out composition filtering to same input signal and is specially: each low order subfilter is for the filtering of the difference response in same input signal.
Step 206, the filtering subsignal corresponding with low order subfilter to be added, to generate filtering signal.
As shown in Figure 8, addition process is carried out to s1, s2 and s3 and draw filtering signal s.Then filtering signal s=s1+s2+s3.
Fig. 9 is the oscillogram of the filtering signal drawn after adopting the low order subfilter of the present embodiment to carry out filtering to input signal, Figure 9 shows that the oscillogram of the filtering signal drawn after 32 rank subfilters carry out filtering to input signal, as can be seen from Figure 9, filtered the HFS (that is: frequency is greater than the part of 35Hz) in signal in filtering and remained the low frequency part (that is: frequency is less than or equal to the part of 35Hz) in signal, and filtering signal becomes stable.Shown in comparison diagram 3 and Fig. 9, the filtering signal drawn after adopting the higher order filter after discretization to carry out filtering to input signal becomes to be dispersed, and after higher order filter being resolved into multiple low order subfilter, the filtering signal drawn after adopting low order subfilter to carry out filtering to input signal then becomes stable.
Step 207, output filtering signal.
Step 208, output filter coefficient.
In the present embodiment, the execution sequence of each step can change as required, and such as: step 208 can perform before step 207, step 204 can perform before step 201.
In the technical scheme of the filtering method that the present embodiment provides, respectively filtering is carried out to input signal by multiple low order subfilter and draw corresponding filtering subsignal, and the addition of filtering subsignal is drawn filtering signal, the filtering signal adopting above-mentioned filtering method to draw is stablized, improve filter wave stability, thus correct filtering signal can be obtained.When particularly carrying out filtering to high-frequency input signal, the filtering signal drawn is stablized, and improves filter wave stability, thus can obtain correct filtering signal.Realize can generating low order subfilter in advance in the scheme of this filtering method, and this filtering method can independent operating, do not rely on other runtime environments, make to run in this filtering method portable to other system, solve the problem of the filter transplantability difference realizing this filtering method, thus reduce the integrated difficulty of system.Adopt multi-threading parallel process technology to carry out filtering operation to multiple low order subfilter simultaneously, when the data volume of input signal is larger, effectively can reduce operation time, improve operation efficiency.In the present embodiment, automatically can generate higher order filter according to the filter parameter of user's input, and automatically carry out decompositions generation low order subfilter to higher order filter, the filter of generation can independent operating, do not rely on other runtime environments, thus reduce the integrated difficulty of system.
The structural representation of a kind of filter that Figure 10 provides for the embodiment of the present invention three, as shown in Figure 10, this filter comprises: the input module 11 connected successively, filtration module 12, summation module 13 and output module 14.
Input module 11 is for inputting input signal.Filtration module 12, for carrying out filtering to input signal respectively by multiple low order subfilter, generates the filtering subsignal corresponding with low order subfilter.Summation module 13, for being added by the filtering subsignal corresponding with low order subfilter, generates filtering signal.Output module 14 is for output filtering signal.
Alternatively, filtration module 12 can comprise: multiple filtering submodule, and each filtering submodule corresponds to a low order subfilter.Each filtering submodule carries out filtering by a low order subfilter to input signal for performing simultaneously, generates the step of the filtering subsignal corresponding with low order subfilter.This kind of mode adopts multi-threading parallel process technology, carries out filtering operation by multiple filtering submodule to low order subfilter simultaneously, when the data volume of input signal is larger, effectively can reduce operation time, improves operation efficiency.
In actual applications, alternatively, each filtering submodule can also be used for performing successively and carries out filtering by a low order subfilter to input signal, generates the step of the filtering subsignal corresponding with low order subfilter.
Alternatively, this filter can also comprise: determination module 15 Sum decomposition module 16, determination module 15 is connected with decomposing module 16, and decomposing module 16 is connected with filtration module 12.Determination module 15 determines higher order filter for the filter parameter inputted according to user.Decomposing module 16, for decomposing higher order filter, generates multiple low order subfilter.Wherein, filter parameter can comprise: order, cut-off frequency and sampling period.Preferably, the order of higher order filter comprises: 2 rank, rank to 8.
Alternatively, this filter also comprises: descretization module 17, and sliding-model control module 17 is connected with decomposing module 16 and filtration module 12 respectively.Descretization module 17 is for carrying out sliding-model control to multiple low order subfilter.Particularly, descretization module 17 carries out sliding-model control for the multiple low order subfilters generated decomposing module 16, and triggers filtration module 12 and carry out filtering to input signal respectively by the multiple low order subfilters after discretization.
Preferably, the filter that the present embodiment provides can be dynamic link library (Dynamic LinkLibrary, be called for short: DLL) file, this filter can be provided application programming interface (Application Programming Interface with the form of dll file to user by the present invention, be called for short: API), thus be convenient to user this filter is integrated in other system, easy to use.
Preferably, by field programmable gate array, (Field-Programmable Gate Array is called for short: FPGA) system realizes the filter that the present embodiment provides.Then drawing the scheme of low order subfilter by decomposing higher order filter, effectively reducing complexity and the cost of FPGA system.
Preferably, the filter that the present embodiment provides is Butterworth filter.
In the technical scheme of the filter that the present embodiment provides, respectively filtering is carried out to input signal by multiple low order subfilter and draw corresponding filtering subsignal, and the addition of filtering subsignal is drawn filtering signal, the filtering signal adopting above-mentioned filter to draw is stablized, improve filter wave stability, thus correct filtering signal can be obtained.When particularly carrying out filtering to high-frequency input signal, the filtering signal drawn is stablized, and improves filter wave stability, thus can obtain correct filtering signal.This filter can generate low order subfilter in advance, and this filter can independent operating, does not rely on other runtime environments, makes to run in this filter portable to other system, solve the problem of filter transplantability difference, thus reduce the integrated difficulty of system.Adopt multi-threading parallel process technology to carry out filtering operation to multiple low order subfilter simultaneously, when the data volume of input signal is larger, effectively can reduce operation time, improve operation efficiency.In the present embodiment, automatically can generate higher order filter according to the filter parameter of user's input, and automatically carry out decompositions generation low order subfilter to higher order filter, the filter of generation can independent operating, do not rely on other runtime environments, thus reduce the integrated difficulty of system.
The structural representation of a kind of flicker test system that Figure 11 provides for the embodiment of the present invention four, as shown in figure 11, this flicker test system comprises: low pass filter 1.The filter that this low pass filter 1 can adopt above-described embodiment three to provide, repeats no more herein.When this low pass filter 1 is applied to flicker test system, input signal is flickering signal.
Alternatively, this flicker test system can also comprise: square examination filter 2, high pass filter 3 and square low-pass first order filter 4, and square examination filter 2, high pass filter 3, low pass filter 1 are connected successively with square low-pass first order filter 4.Square examination filter 2 for carrying out square examination filtering process to input signal, and exports the input signal through square examination filtering process to high pass filter 3.High pass filter 3 for carrying out high-pass filtering process to input signal, and exports the input signal through high-pass filtering process to low pass filter 1.Low pass filter 1 generates filtering signal for carrying out low-pass filtering treatment to input signal, and exports the filtering signal through low-pass filtering treatment to square low-pass first order filter 4.Square low-pass first order filter 4 for carrying out a square first-order low-pass ripple process to filtering signal, and exports the filtering signal through square first-order low-pass ripple process.Above-mentioned square examination filter 2, high pass filter 3 and square low-pass first order filter 4 all perform filtering computational process according to IEC61000-4-15 standard.
Alternatively, this flicker test system can also comprise: the analytic statistics module 5 be connected with square low-pass first order filter 4.Analytic statistics module 5 carries out analytic statistics process for the filtering signal exported square low-pass first order filter 4, draws flickering signal.Above-mentioned analytic statistics module 5 performs computational process according to IEC61000-4-15 standard.
Alternatively, this flicker test system can also comprise: data acquisition module 6 and adapt voltages module 7, and data acquisition module 6 is connected with adapt voltages module 7, and adapt voltages module 7 is connected with square Fault detection filter 2.This data acquisition module 6 carries out the acquisition process of instantaneous voltage value for using SL1000 data acquisition module to input signal.Adapt voltages module 7 is for carrying out adapt voltages process to the input signal through instantaneous voltage value acquisition process.Above-mentioned adapt voltages module 7 performs computational process according to IEC61000-4-15 standard.
Alternatively, this flicker test system can also comprise: the diopter sense weighting filter 8 be connected with low pass filter 1 and square low-pass first order filter 4 respectively.Diopter sense weighting filter 8 carries out visual degree sense weighted filtering process for the filtering signal exported low pass filter 1, and exports the filtering signal through visual degree sense weighted filtering process to square low-pass first order filter 4.
Specify according in IEC61000-4-15 standard, carry out in the process of low-pass filtering treatment at low pass filter 1 pair of input signal, need to adopt cut-off frequency to be the 6 rank Butterworth filters of 35Hz.And the filter that this low pass filter 1 can adopt above-described embodiment three to provide carries out low-pass filtering treatment to input signal, concrete filter process can adopt above-described embodiment one or the filtering method described in embodiment two, repeats no more herein.
The flicker test system that the present embodiment provides is mainly used in power domain.In actual applications, filter provided by the invention can also be widely used in the fields such as communication, speech processes, control, medical treatment and navigation, owing to adopting filter provided by the invention can obtain stable filtering signal, therefore above-mentioned each field is had great importance.
In the technical scheme of the flicker test system that the present embodiment provides, low pass filter carries out filtering to input signal respectively by multiple low order subfilter and draws corresponding filtering subsignal, and the addition of filtering subsignal is drawn filtering signal, the filtering signal adopting above-mentioned low pass filter to draw is stablized, improve filter wave stability, thus correct filtering signal can be obtained.When particularly carrying out filtering to high-frequency input signal, the filtering signal drawn is stablized, and improves filter wave stability, thus can obtain correct filtering signal.This low pass filter can generate low order subfilter in advance, and this filter can independent operating, does not rely on other runtime environments, makes to run in this low pass filter portable to other system, solve the problem of low pass filter transplantability difference, thus reduce the integrated difficulty of system.Adopt multi-threading parallel process technology to carry out filtering operation to multiple low order subfilter simultaneously, when the data volume of input signal is larger, effectively can reduce operation time, improve operation efficiency.In the present embodiment, automatically can generate higher order filter according to the filter parameter of user's input, and automatically carry out decompositions generation low order subfilter to higher order filter, the filter of generation can independent operating, do not rely on other runtime environments, thus reduce the integrated difficulty of system.The above-mentioned low pass filter of flicker test system can improve filtration efficiency and development efficiency.
Be understandable that, the illustrative embodiments that above execution mode is only used to principle of the present invention is described and adopts, but the present invention is not limited thereto.For those skilled in the art, without departing from the spirit and substance in the present invention, can make various modification and improvement, these modification and improvement are also considered as protection scope of the present invention.
Claims (13)
1. a filtering method, is characterized in that, comprising:
Respectively filtering is carried out to input signal by the multiple low order subfilters generated in advance, generate the filtering subsignal corresponding with described low order subfilter;
The filtering subsignal corresponding with described low order subfilter is added, generates filtering signal;
Export described filtering signal.
2. filtering method according to claim 1, is characterized in that, describedly carries out filtering to input signal respectively by multiple low order subfilter and comprises:
Respectively filtering is carried out to described input signal by multiple low order subfilter simultaneously; Or
Respectively filtering is carried out to described input signal by multiple low order subfilter successively.
3. filtering method according to claim 1, is characterized in that, described respectively filtering is carried out to input signal by multiple low order subfilter before also comprise:
Filter parameter according to user's input determines higher order filter;
Described higher order filter is decomposed, generates described multiple low order subfilter.
4. filtering method according to claim 3, is characterized in that, described filter parameter comprises: the order of higher order filter, cut-off frequency and sampling period.
5. filtering method according to claim 3, is characterized in that, also comprises after the described multiple low order subfilter of described generation:
Sliding-model control is carried out to described multiple low order subfilter.
6., according to the arbitrary described filtering method of claim 3 to 5, it is characterized in that, the order of described higher order filter comprises: 2 rank, rank to 8.
7. a filter, is characterized in that, comprising:
Input module, for inputting input signal;
Filtration module, carrying out filtering to described input signal respectively for the multiple low order subfilters by generating in advance, generating the filtering subsignal corresponding with described low order subfilter;
Summation module, for being added by the filtering subsignal corresponding with described low order subfilter, generates filtering signal;
Output module, for exporting described filtering signal.
8. filter according to claim 7, is characterized in that, described filtration module comprises: multiple filtering submodule, and each described filtering submodule corresponds to a described low order subfilter;
Each described filtering submodule, carries out filtering by a described low order subfilter to input signal for performing simultaneously, generates the step of the filtering subsignal corresponding with described low order subfilter; Or by a described low order subfilter, filtering being carried out to input signal for performing successively, generating the step of the filtering subsignal corresponding with described low order subfilter.
9. filter according to claim 7, is characterized in that, also comprises:
Determination module, determines higher order filter for the filter parameter inputted according to user;
Decomposing module, for decomposing described higher order filter, generates described multiple low order subfilter.
10. filter according to claim 9, is characterized in that, described filter parameter comprises: order, cut-off frequency and sampling period.
11. filters according to claim 9, is characterized in that, also comprise:
Descretization module, for carrying out sliding-model control to described multiple low order subfilter.
12. according to the arbitrary described filter of claim 7 to 11, and it is characterized in that, the order of described higher order filter comprises: 2 rank, rank to 8.
13. 1 kinds of flicker test systems, is characterized in that, comprising: low pass filter, and described low pass filter adopts the arbitrary described filter of the claims 7 to 12.
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