CN107104656A - Filter time constant changes circuit and D/A change-over circuits - Google Patents
Filter time constant changes circuit and D/A change-over circuits Download PDFInfo
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- CN107104656A CN107104656A CN201710081756.7A CN201710081756A CN107104656A CN 107104656 A CN107104656 A CN 107104656A CN 201710081756 A CN201710081756 A CN 201710081756A CN 107104656 A CN107104656 A CN 107104656A
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- time constant
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H17/00—Networks using digital techniques
- H03H17/0009—Time-delay networks
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/06—Continuously compensating for, or preventing, undesired influence of physical parameters
- H03M1/0617—Continuously compensating for, or preventing, undesired influence of physical parameters characterised by the use of methods or means not specific to a particular type of detrimental influence
- H03M1/0626—Continuously compensating for, or preventing, undesired influence of physical parameters characterised by the use of methods or means not specific to a particular type of detrimental influence by filtering
- H03M1/0631—Smoothing
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/66—Digital/analogue converters
- H03M1/82—Digital/analogue converters with intermediate conversion to time interval
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H2210/00—Indexing scheme relating to details of tunable filters
- H03H2210/04—Filter calibration method
- H03H2210/043—Filter calibration method by measuring time constant
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- Theoretical Computer Science (AREA)
- Analogue/Digital Conversion (AREA)
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Abstract
The invention discloses a kind of filter time constant change circuit and D/A change-over circuits, in the change with the input signal correspondingly composition of change filter time constant, the ripple of the output of wave filter is reduced.Filter time constant change circuit (4) includes：Variable quantity calculating part (40,41), its each stipulated time T for calculating the value f (t T) that the input signal before T time is lighted by the value f (t) of the input signal of current point in time and from current time and obtaining variable quantity h (t, T)=f (t) f (t T)；And comparing section (42), it carrys out the control signal of the time constant of output control wave filter (2) according to variable quantity h (t, T) and defined threshold comparative result.
Description
Technical field
The present invention relates to the filter time constant change that filter time constant is changed according to the change of input signal
Circuit, and use the D/A change-over circuits of filter time constant change circuit.
Background technology
It is general using being smoothed by low pass filter to the waveform of pulse in the output of D/A change-over circuits
The mode of output.According to the size of filter time constant now, response speed can not be taken into account simultaneously with ripple.Actually
It is determined that during filter time constant, being such as defined as response speed as fast as possible in the value for the ripple that can be allowed
Deng.On the other hand, when carrying out the big change of output of D/A change-over circuits step by step, exist due to the response speed
Situation of the delay as problem followed caused by limitation.
It is used as the solution countermeasure of such problem, it is proposed that following technology：In the big of the output that there is D/A change-over circuits and
During the change of urgency, by reducing filter time constant, realize the limitation of ripple and accelerate response (with reference to patent document
1).Figure 14 is the block diagram for the composition for representing the D/A change-over circuits disclosed in patent document 1.Figure 14 D/A change-over circuits are used
ASIC (Application Specific Integrated Circuit, application specific integrated circuit) 300, so that response is improved.
When the numerical data for making pwm signal there occurs change, switch to the time constant that is formed by resistance 302 and electric capacity 303 compared with
Small analog filter, improves response.When numerical data does not change, switch to what is be made up of resistance 301 and electric capacity 303
The larger analog filter of time constant, suppresses output ripple.
Accordingly make wave filter with from the size that D/A change-over circuits are inputted to the change of the input signal of wave filter
In the case that time constant changes, the idea of general knowledge is used as, alternatively it is conceivable to which such as Figure 15 is such to be constituted.In Figure 15 example
In son, variable quantity calculating part 100 calculates input signal f (t) variation delta f (t)/Δ t, according to the variation delta f (t)/Δ
T, time constant changing unit 101 changes the time constant of wave filter 102.In Figure 16 example, occur in input signal f (t)
During change, the time constant of wave filter 102 is changed.On the other hand, it is super in variation delta f (t)/Δ t in Figure 17 example
When having crossed threshold value TH, the time constant of wave filter 102 is changed.
Usually, variable quantity calculating part 100 carry out processing equivalent to differential, generate the time for wave filter 102
The control signal (Figure 16, Figure 17 filter time constant change mark) of constant change, which is restricted to input signal f (t), to be had
Inclined period.Therefore, in the case where input signal f (t) has inclined time width very short, generate normal for the time
The time width of the control signal of number change also shortens.It is filtered the reasonable time width of the time constant change of device 102
Time constant that wave filter 102 has and the purpose of wave filter 102 are depended on, therefore, is become if generated for time constant
If the time width of control signal more shortens, it is likely that the time constant that can not fully play wave filter 102 becomes
Function for the purpose of more.
For example, it is contemplated that following situation：In order to which the change drastically with certain certain input signal f (t) above is corresponding,
Change with input signal f (t) accordingly temporarily reduces the time constant of wave filter 102.Now, the time of time constant is changed
Width is needed for following length：That is, according to the time constant of the wave filter 102 after change, input signal f can fully be followed
(t).Even if reducing wave filter 102 (only during differential value exceedes threshold value TH) only during input signal f (t) change
Time constant, the output of wave filter 102 also turns into Figure 18 like that, can not fully play the function of wave filter 102.In figure
In 18 example, g (t) represents the actual output of wave filter 102, and g ' (t) represents preferable output.It can be seen from Figure 18, filter
The output g (t) of ripple device 102 can not follow input signal f (t) change.
The problem of point is constituted for such Figure 15, is readily apparent that：Using timer, with the defeated of variable quantity calculating part 100
Go out (input signal f (t) differential value) as triggering, will in the case where the output of variable quantity calculating part 100 has exceeded threshold value
The time constant change of wave filter 102 keeps the mechanism of certain time, the function thus, it is possible to fully play wave filter 102.
In Figure 19 example, by setting timer 103 between variable quantity calculating part 100 and time constant changing unit 101, by counting
When device 103 make signal to time width necessary to the following of input signal f (t), thus as shown in figure 20, give to defeated
Enter signal f (t) time width for following necessary time constant change.
But, in the composition shown in Figure 19, in output (input signal f (t) differential with variable quantity calculating part 100
Value) as wave filter 102 time constant change triggering in, exist increase script be not intended to scene under misoperation it
Anxiety.For example, the change of the input signal f (t) with moment as shown in Figure 21 is corresponding, certain time wave filter has been carried out
102 time constant change, is existed the problem of the output g (t) for the region filters 102 being not intended to produces ripple.
Prior art literature
Patent document
Patent document 1：Japanese Unexamined Patent Publication 2003-101413 publications
The content of the invention
Problems to be solved by the invention
As described above, in the change with the input signal correspondingly composition of change filter time constant, exist
Following the problem of point：If making the output of wave filter fully follow the change of input signal, produced in the output of wave filter
Raw larger ripple.
In addition, being not limited to be output as the wave filter of input the problem of the above with D/A change-over circuits, such as to analog signal
It is filtered to handle and input into the wave filter of A/D change-over circuits etc. and similarly occurs.
The present invention completes to solve the above problems, and its object is to there is provided a kind of change with input signal
Correspondingly in the composition of change filter time constant, the filter time constant of the ripple of the output of wave filter can be reduced
Change circuit.
The technological means solved the problems, such as
The filter time constant for the filter time constant that the present invention is used to be filtered input signal for determination
Circuit is changed, the filter time constant change circuit is characterised by, variable quantity calculating part, and it is calculated by current point in time
The input signal value f (t) and lighted from current time the input signal before T time value f (t-T) and obtain it is each
Stipulated time T variable quantity h (t, T)=f (t)-f (t-T)；And comparing section, it is according to the variable quantity h (t, T) and regulation
The comparative result of threshold value carry out the control signal of filter time constant described in output control.
In addition, in a configuration example of the filter time constant change circuit of the present invention, it is characterised in that in the variable quantity
H (t, T) be below the threshold value in the case of, comparing section output makes the filter time constant be the 1st wave filter
The control signal of timeconstantτ 1；In the case where the variable quantity h (t, T) exceedes the threshold value, the comparing section output makes
The filter time constant is changed to the 2nd filter time constant τ's 2 less than the 1st filter time constant τ 1
Control signal.
In addition, in a configuration example of the filter time constant change circuit of the present invention, it is characterised in that the stipulated time
T is lights from the change time started of the input signal, until in the 2nd filter time constant τ 2, the filtering
The value of the output signal of device relative to the end value of the change reach as defined in time untill ratio.
In addition, the D/A change-over circuits of the present invention are characterised by, including：D/A converter sections, it turns digital input signals
It is changed to analog signal；Wave filter, its output signal to the D/A converter sections is smoothed；And appoint in technical scheme 1 to 3
Filter time constant change circuit described in one, it is filtered using the digital input signals as input described in output control
The control signal of the time constant of ripple device.
The effect of invention
According to the present invention, by setting variable quantity calculating part and comparing section, the output of wave filter can be made to follow input letter
Number change, and the ripple of the output of wave filter can be reduced.In addition, in the present invention, due to can without using it is existing that
The ripple reduction of the output of wave filter is realized, therefore, it is possible to easily carry out the installation of circuit the timer of sample.
Brief description of the drawings
The oscillogram of Fig. 1 principles that involved variable quantity is calculated to illustrate the invention.
The oscillogram of Fig. 2 principles that involved variable quantity is calculated to illustrate the invention.
Fig. 3 is the oscillogram for illustrating the action of change filter time constant in the present invention.
The oscillogram for the other examples that Fig. 4 calculates for expression variable quantity involved in the present invention.
The oscillogram for the other examples that Fig. 5 calculates for expression variable quantity involved in the present invention.
Fig. 6 is the oscillogram for illustrating the action of change filter time constant in the present invention.
The oscillogram for the other examples that Fig. 7 calculates for expression variable quantity involved in the present invention.
The oscillogram for the other examples that Fig. 8 calculates for expression variable quantity involved in the present invention.
Fig. 9 is the oscillogram for illustrating the action of change filter time constant in the present invention.
Figure 10 is the block diagram for the composition for representing the D/A change-over circuits involved by embodiments of the present invention.
The figure of the establishing method of stipulated time in the embodiments of Figure 11 to illustrate the invention.
Figure 12 is the oscillogram of the example for the response for representing the D/A change-over circuits involved by embodiments of the present invention.
Figure 13 is the oscillogram of the measured result for the response for representing the D/A change-over circuits involved by embodiments of the present invention.
Figure 14 is the block diagram for the composition for representing existing D/A change-over circuits.
Figure 15 is represents to make the block diagram of composition that filter time constant changes.
Figure 16 is the oscillogram for illustrating to change the action of filter time constant in Figure 15 composition.
Figure 17 is the oscillogram for illustrating to change other actions of filter time constant in Figure 15 composition.
Figure 18 is the oscillogram for the composition the problem of point for illustrating Figure 15.
Figure 19 represents other block diagrams constituted for making filter time constant change.
Figure 20 is the oscillogram for illustrating to change the action of filter time constant in Figure 19 composition.
Figure 21 is the oscillogram for the composition the problem of point for illustrating Figure 19.
Embodiment
[inventive principle]
Fig. 1 (A)~Fig. 1 (C), Fig. 2 (A)~Fig. 2 (C) principles that involved variable quantity is calculated to illustrate the invention
Oscillogram.In the present invention, the existing composition that will calculate the variable quantity (differential value) of input signal replaces with calculating with making
For the composition of corresponding each time width T of the time constant change of the purpose of wave filter variable quantity, thus, make filtering
The effect of the time constant change of device rightly reflects.Specifically, calculate by the desired current point in time for calculating variable quantity
When the value f (t) of input signal is with each regulation that the value f (t-T) of the input signal before T time is lighted from current time and is obtained
Between variable quantity h (t, T)=f (t)-f (t-T), and filter time constant is determined according to the result of calculation.Fig. 1's
(A) in~Fig. 1 (C), the example of Fig. 2 (A)~Fig. 2 (C), show corresponding to the input signal changed over time gradually
Calculate variable quantity h (t, T) situation.
According to when the variable quantity h (t, T) calculated as described above has exceeded wave filter when regulation is threshold value TH
Between if the constant composition that diminishes and (filter time constant is changed into mark and be used as " 1 "), the output g (t) of wave filter is as Fig. 3
It is shown such.G ' (t) in Fig. 3 represents preferable output.
Then as can be seen that the output g (t) of wave filter of the present invention follows defeated earlier if being compared with Figure 20 situation
Enter signal f (t).
In addition, in the present invention, variable quantity h (t, T) is as information using the total amount of the size of input signal f (t) change
Comprising form, therefore the problem of do not occur at Figure 21 explanations such ripple.In (D), Fig. 5 in Fig. 4 (A)~Fig. 4
Show the result calculated for the variable quantity of the invention of input signal f (t) changes of moment as shown in Figure 21.
By the time of wave filter when the result of calculation of (D), Fig. 5 according to (A)~Fig. 4 in Fig. 4 have exceeded threshold value TH
The composition that constant diminishes, then the output g (t) of wave filter is as shown in Figure 6.In the present invention, according to the two of input signal
(maximum that f (t)-f (t-T) can be obtained carrys out defined threshold TH to difference between point, therefore will not occur by making an uproar less than threshold value TH
Misoperation caused by sound.
In addition, in the present invention, the noise even in very sharp and big value has been mixed into feelings in input signal f (t)
Under condition, also due to becoming under the time width within time width × 2 at the peak of the noise to filter time constant
Action more, therefore, it is possible to expect to diminish to the influence that wave filter is exported compared with situations of the Figure 19 using timer.Fig. 7's
(A) show that the variable quantity of the invention for such noise inputs is calculated in~Fig. 7 (C), Fig. 8 (A), Fig. 8 (B)
Result.
When (A) of (C), Fig. 8 according to (A)~Fig. 7 in Fig. 7, the result of calculation of Fig. 8 (B) have exceeded threshold value TH
The composition that filter time constant is diminished, then the output g (t) of wave filter is as shown in Figure 9.
As previously discussed, in the present invention, can solve the problem that it is producing in the prior art, in the defeated of the region filters being not intended to
Go out g (t) and produce the problem of ripple is such.
[embodiment]
Hereinafter, embodiments of the present invention are illustrated referring to the drawings.Figure 10 is involved by expression embodiments of the present invention
D/A change-over circuits composition block diagram.The D/A change-over circuits of present embodiment by partly constituting as follows：D/A converter sections 1, its
16bit digital input signals f (t) is converted into analog signal；Low pass filter 2, its output signal to D/A converter sections 1
Smoothed；Buffer circuit 3, it is connected to the lead-out terminal of low pass filter 2；And filter time constant change electricity
Road 4, its variable quantity based on input signal f (t) determines the time constant of low pass filter 2.
As D/A converter sections 1, Deltasigma modulator, PWM (Pulse Width Modulation, pulse width can be applicable
Modulation) modulator, the resistive type D/A converter of T-shaped etc. are various constitutes, and the present invention does not limit the mode of D/A conversions.
Low pass filter 2 by partly constituting as follows：Resistance R1, R2, it is disposed in series in the output end of D/A converter sections 1
Between son and the input terminal of buffer circuit 3；SW1 is switched, it is according to the control letter that circuit 4 is changed from filter time constant
Number carry out short-circuit resistance R1；And electric capacity C1, it is arranged between the input terminal of buffer circuit 3 and ground connection.
Filter time constant change circuit 4 is made up of delay portion 40, subtraction portion 41 and comparing section 42 (comparator).Prolong
Slow portion 40 constitutes variable quantity calculating part with subtraction portion 41.
Delay portion 40 makes digital input signals f (t) delay stipulated times T.As delay portion 40, touching for multi-stage cascade can be used
Send out device.
Subtraction portion 41 subtracts the digital output signal of delay portion 40 from digital input signals f (t).In such manner, it is possible to calculate per a period of time
Between T input signal variable quantity, i.e., can calculate h (t, T)=f (t)-f (t-T).
The digital output signal of subtraction portion 41 is compared by comparing section 42 with defined threshold value TH.In the number of subtraction portion 41
When the value of word output signal has exceeded threshold value TH, comparing section 42 is by the control signal of the switch SW1 for controlling low pass filter 2
(filter time constant change mark) is set to " 1 " (High, high), is threshold value TH in the value of the digital output signal of subtraction portion 41
When following, control signal is set to " 0 " (Low, low) by comparing section 42.On threshold value TH, it is considered to the difference of the point-to-point transmission of input signal
(size for the noise that maximum that f (t)-f (t-T) can be obtained and wanting is removed and set in advance.
Low pass filter 2 is that can change the active filter of time constant.In the control signal exported from comparing section 42
During for " 1 ", switch SW1 is conducting state.Thus, because resistance R1 is short-circuited, thus the time constant change of low pass filter 2
It is small.When the control signal exported from comparing section 42 is " 0 ", switch SW1 is off-state.Thus, because resistance R1 and R2 goes here and there
The connection of connection ground, thus the time constant of low pass filter 2 becomes big.
As shown in figure 11, the stipulated time T of the time delay as delay portion 40, is set as T by the following time in advance
：That is, lighted from input signal f (t) the change time started, until the value phase of the output signal g (t) of D/A change-over circuits
For the change end value (100%) reach as defined in time untill ratio A (such as 63.2% or 90%).Ratio A
Set according to the desired performance of D/A change-over circuits.
In the present embodiment, the output signal g (t) for determining D/A change-over circuits by the time constant of low pass filter 2 is chased after
With input signal f (t) speed and output signal g (t) ripple level, the level of the speed and ripple can not be simultaneously simultaneous
Turn round and look at.In the present embodiment, low pass filter 2 is using such as τ 1=10msec time constant as basic, but in the opposing party
Face is also required to 1msec high-speed response sometimes.But, if using the time constant of low pass filter 2 as τ 2=1msec, it is defeated
The ripple for going out signal g (t) becomes big.Therefore, T=1msec, A=63.2% are prepared with, and input signal f (t) urgency can be followed
The high-speed response pattern of drastic change.
According to present embodiment, as shown in figure 12, when input signal f (t) there occurs change, as following action：
Threshold value TH t1 time points are exceeded in variable quantity h (t, T), the time constant of low pass filter 2 becomes from such as τ 1=10msec
More τ 2=1msec (switch SW1 conductings)；In output signal g (t) ratio A=63.2% is reached relative to input signal f (t)
T2 time points, the time constant of low pass filter 2 is changed to τ 1=10msec from τ 2=1msec (switch SW1 disconnects).
Figure 13 is the oscillogram of the measured result of the response for the D/A change-over circuits for representing present embodiment.Figure 13 130 tables
Show the output signal g (t) of the D/A change-over circuits when the time constant of low pass filter 2 is fixed as into 1msec, 131 represent
The output signal g (t) of D/A change-over circuits when the time constant of low pass filter 2 to be fixed as to 10msec, 132 represent this reality
Apply the output signal g (t) of the D/A change-over circuits of mode.
As seen from Figure 13, it is very big if occurring if reducing the time constant of low pass filter 2 in output signal g (t)
Ripple.Therefore, it is desirable to reduce the time constant of low pass filter 2 only during input signal f (t) change is followed, still
Even if it is also inadequate only to reduce time constant in input signal f (t) change moment.Therefore, in the present embodiment, pass through
Input signal f (t) variable quantity h (t, T) is calculated, only reduces low pass filter during variable quantity h (t, T) is beyond threshold value TH
2 time constant, realizes the time of sufficient time constant change.
In the present embodiment, due to that can realize that the ripple of output is reduced without using the timer shown in Figure 19, because
This can easily carry out the installation of the D/A change-over circuits to integrated circuit.
In addition, in the present embodiment, being arranged as an example with firstorder filter as the example of low pass filter 2
Explanation is lifted, but is not limited to this, in other wave filters such as by the higher order filter of firstorder filter multi-stage cascade
Also the present invention can be applicable.
In addition, in the present embodiment, it is illustrated using the example that is applicable as D/A change-over circuits, can also be by
The filter time constant change application of circuit 4 of the present invention is the input unit of A/D change-over circuits.In this case, it will simulate defeated
Enter signal f (t) inputs to low pass filter 2, the output signal of low pass filter 2 is inputted to A/D change-over circuits.Filtering
Device time constant change circuit 4 is made up of analog circuit.As the example of delay portion 40, for example, there are CCD (Charge-Coupled
Device, charge coupled cell).
【Utilization possibility in industry】
The present invention can be applied to change the technology of filter time constant based on input signal.
Symbol description
1 ... D/A converter sections, 2 ... low pass filters, 3 ... buffer circuits, 4 ... filter time constants change circuit, 40 ...
Delay portion, 41 ... subtraction portions, 42 ... comparing sections, R1, R2 ... resistance, C1 ... electric capacity, SW1 ... switches.
Claims (4)
1. a kind of filter time constant changes circuit, the time that its determination is used for the wave filter being filtered to input signal is normal
Number, the filter time constant changes circuit and is characterised by, including：
Variable quantity calculating part, its calculate by current point in time the input signal value f (t) and from current time light T when
Between before input signal value f (t-T) and obtain each stipulated time T variable quantity h (t, T)=f (t)-f (t-T)；And
Comparing section, its wave filter according to the comparative result of the variable quantity h (t, T) and defined threshold value carrys out output control
The control signal of time constant.
2. filter time constant as claimed in claim 1 changes circuit, it is characterised in that
In the case where the variable quantity h (t, T) is below the threshold value, the comparing section output makes the time of the wave filter
Constant is the 1st filter time constant τ 1 control signal；
In the case where the variable quantity h (t, T) exceedes the threshold value, the comparing section output makes the time of the wave filter normal
Number is changed to the control signal of the 2nd filter time constant τ 2 less than the 1st filter time constant τ 1.
3. filter time constant as claimed in claim 2 changes circuit, it is characterised in that
The stipulated time T is lights from the change time started of the input signal, until normal in the 2nd filter temporal
In number τ 2, the value of the output signal of the wave filter relative to the end value of the change reach as defined in time untill ratio.
4. a kind of D/A change-over circuits, it is characterised in that including：
D/A converter sections, digital input signals are converted to analog signal by it；
Wave filter, its output signal to the D/A converter sections is smoothed；And
Filter time constant change circuit any one of claims 1 to 3, it is using the digital input signals to be defeated
Enter, and the control signal of filter time constant described in output control.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2016029963A JP6626362B2 (en) | 2016-02-19 | 2016-02-19 | Filter time constant changing circuit and D / A conversion circuit |
| JP2016-029963 | 2016-02-19 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107104656A true CN107104656A (en) | 2017-08-29 |
| CN107104656B CN107104656B (en) | 2020-06-16 |
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| CN201710081756.7A Active CN107104656B (en) | 2016-02-19 | 2017-02-15 | Filter time constant changing circuit and D/A converting circuit |
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|---|---|
| JP (1) | JP6626362B2 (en) |
| KR (1) | KR101877665B1 (en) |
| CN (1) | CN107104656B (en) |
| TW (1) | TWI634752B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113110343A (en) * | 2021-04-23 | 2021-07-13 | 广东电网有限责任公司电力科学研究院 | Control method and system of double-parameter approximate sliding window filter |
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- 2016-12-13 TW TW105141196A patent/TWI634752B/en active
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- 2017-02-13 KR KR1020170019407A patent/KR101877665B1/en active IP Right Grant
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| CN1197556A (en) * | 1996-07-09 | 1998-10-28 | 昆腾公司 | Pulser-width-modulated digital-to-analog converter with high gain and low gain modes |
| US5936564A (en) * | 1996-07-09 | 1999-08-10 | Samsung Electronics Co., Ltd. | Digital to analog converter using pulse width modulation and the controlling method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113110343A (en) * | 2021-04-23 | 2021-07-13 | 广东电网有限责任公司电力科学研究院 | Control method and system of double-parameter approximate sliding window filter |
Also Published As
| Publication number | Publication date |
|---|---|
| TWI634752B (en) | 2018-09-01 |
| JP6626362B2 (en) | 2019-12-25 |
| CN107104656B (en) | 2020-06-16 |
| JP2017147685A (en) | 2017-08-24 |
| TW201731220A (en) | 2017-09-01 |
| KR101877665B1 (en) | 2018-07-12 |
| KR20170098167A (en) | 2017-08-29 |
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