CN104378115B - A kind of software filtering method of AD samplings - Google Patents
A kind of software filtering method of AD samplings Download PDFInfo
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Abstract
The present invention provides a kind of software filtering method of AD samplings, and the AD sampled values that will be collected are stored in array ADCLSB and array ADCCOM, comprise the following steps：Step S1, judge whether array ADCLSB has expired, if having expired, be transferred to step S5；If not full, step S2 is transferred to；Step S2, judge whether array ADCCOM has expired, if not full, jump out；If having expired, step S3 is transferred to；Step S3, the sampled value in array ADCCOM is judged, draw the judgment value of sampled value in current array ADCCOM；Step S4：Judge that sampled value is interference value or signal normal variation according to judgment value, and update array ADCCOM and array ADCLSB；Step S5, the data in array ADCLSB are carried out digital averaging filtering and RC filtering, so as to obtain final AD sampled values.The software filtering method of AD of the invention sampling easily realizes, respond soon, anti-interference it is high, and can effectively suppress noise.
Description
Technical field
The present invention relates to a kind of filtering method, more particularly to a kind of software filtering method of AD samplings.
Background technology
Analog signal, and the number that will be collected are gathered in conventional instrument using the method for Single-chip Controlling A/D converter circuit
Word sequence is stored in single-chip microcomputer.Single-chip microcomputer is filtered treatment to above-mentioned Serial No. again.Software filtering be exactly with software come
Identification useful signal and interference signal, and filtering interference signals.Common filtering method has middle position value filtering, arithmetic mean to filter
Method, Glitch Filter method.
Specifically, middle position value filtering method continuous sampling n times（N takes odd number）, and n times sampled value is sized, in taking
Between value be this virtual value.The filter method can effectively overcome the fluctuation caused by accidentalia to disturb, to temperature, the change of liquid level
Slow measured parameter has good filter effect.
Digital averaging filtering method continuously takes N number of sampled value and carries out arithmetic average computing.The filter method is applied to general tool
The signal for having random disturbances is filtered.But it is relatively slow for measuring speed or require data calculating speed real-time control faster
It is inapplicable, compare waste RAM.
Glitch Filter method sets a filtering counter and compares each sampled value with the currently active value：If sampled value etc.
In the currently active value, then counter O reset；If sampled value is not equal to the currently active value, counter adds 1, and judges counter
Whether overflow, if counter overflow, this sampled value is replaced with into the currently active value, and reset counter.
But, above-mentioned filtering method often exist response not in time, industrial interference free performance index it is not high, noise is resisted
The low shortcoming of annoyance level.
The content of the invention
The shortcoming of prior art in view of the above, it is an object of the invention to provide a kind of software filtering side of AD samplings
Method, it is easily realized, response is fast, EMC performances are high, and can effectively suppress noise.
In order to achieve the above objects and other related objects, the present invention provides a kind of software filtering method of AD samplings, will adopt
The AD sampled values for collecting are stored in array ADCLSB and array ADCCOM, are comprised the following steps：
Step S1, judge whether array ADCLSB has expired, if having expired, be transferred to step S5；If not full, step is transferred to
S2；
Step S2, judge whether array ADCCOM has expired, if not full, jump out；If having expired, step S3 is transferred to；
Step S3, the sampled value in array ADCCOM is judged, draw sentencing for sampled value in current array ADCCOM
Disconnected value；
Step S4：Judge that sampled value is interference value or signal normal variation according to judgment value, and update array ADCCOM
With array ADCLSB；
Step S5, the data in array ADCLSB are carried out digital averaging filtering and RC filtering, so as to obtain final AD
Sampled value.
According to the software filtering method that above-mentioned AD samples, wherein：In step S4, if cannot judge data change turn to it is dry
The normal variation of still signal is disturbed, then updates array ADCCOM and ADCLSB, wait judge next time；If judging, a certain data are dry
Value is disturbed, then rejects interference value, and interference value is replaced with current sample values, update array ADCCOM and ADCLSB；If judging data
Change turn to signal occur normal variation, update array ADCCOM and array ADCLSB.
According to the software filtering method that above-mentioned AD samples, wherein：The length of array ADCCOM is less than array ADCLSB
Length.
According to the software filtering method that above-mentioned AD samples, wherein：In step S3, the length for setting array ADCCOM is d,
The judgment value of sampled value in current array ADCCOM is then obtained by following rule：
If ADCCOM [i] represents the i+1 value in array ADCCOM；
If | ADCCOM [1]-ADCCOM [0] |>N sets up, then the judged result of the situation is designated as into 1, otherwise be designated as 0；
If | ADCCOM [2]-ADCCOM [0] |>N sets up, then the judged result of the situation is designated as into 1, otherwise be designated as 0；
By that analogy,
If | ADCCOM [d-1]-ADCCOM [0] |>N sets up, then the judged result of the situation is designated as into 1, otherwise be designated as 0；
Above-mentioned d-1 judged result is combined successively can obtain the judgement of sampled value in current number group ADCCOM
Value；
Wherein, n is setting value.
According to the software filtering method that above-mentioned AD samples, wherein：In step S4, sampled value is worth to by observing judgement
Situation of change,
If the significant change of sampled value occurs in the centre of array ADCCOM, then it is assumed that the sampled value of significant change is interference
Value；
If the sampled value in whole array ADCCOM there occurs significant change, then it is assumed that be the normal variation of signal；
In other cases, then it is assumed that the normal variation of interference or signal cannot be judged, must wait judge next time.
According to the software filtering method that above-mentioned AD samples, wherein：In step S4, if cannot judge data change turn to it is dry
The normal variation of still signal is disturbed, then when updating array ADCCOM, first data in array ADCCOM is thrown away, below
Successively to reach, last data uses current AD sample value to data；Array ADCLSB keeps constant.
According to the software filtering method that above-mentioned AD samples, wherein：In step S4, if judging, a certain data are interference value,
When then updating array ADCCOM, interference value is rejected, and interference value is replaced with current sample values, then by first in array ADCCOM
Individual data are thrown away, and successively to reach, last data uses current AD sample value to data below, and updates array ADCLSB
In analog value.
According to the software filtering method that above-mentioned AD samples, wherein：In step S4, if judging, the change of data turns to signal hair
Raw normal variation, then when updating array, make all of data in array ADCCOM into current AD sample value, and update array
Analog value in ADCLSB.
As described above, the software filtering method of AD samplings of the invention, has the advantages that：
（1）Signal normal variation is capable of identify that, signal intensity is timely responded to, and can guarantee that signal smoothing degree；
（2）The interference value of signal in AD samplings can effectively be recognized, and interference is rejected, with very strong interference free performance,
Noise suppressed performance.
Brief description of the drawings
The step of Fig. 1 is shown as the software filtering method of AD samplings of the invention flow chart；
Fig. 2 is shown as the software flow pattern of the software filtering method of AD samplings of the invention.
Specific embodiment
Embodiments of the present invention are illustrated below by way of specific instantiation, those skilled in the art can be by this specification
Disclosed content understands other advantages of the invention and effect easily.The present invention can also be by specific realities different in addition
The mode of applying is embodied or practiced, the various details in this specification can also based on different viewpoints with application, without departing from
Various modifications or alterations are carried out under spirit of the invention.
It should be noted that the diagram provided in the present embodiment only illustrates basic conception of the invention in a schematic way,
Then component count, shape and size when only display is with relevant component in the present invention rather than according to actual implementation in schema are painted
System, it is actual when the implementing kenel of each component, quantity and ratio can be a kind of random change, and its assembly layout kenel also may be used
Can be increasingly complex.
In the software filtering method of AD of the invention samplings, it is necessary first to carry out packet judgement to AD sampled values, obtain
Corresponding judgment value.
The AD sampled values that single-chip microcomputer will be collected currently are stored in array ADCLSB and array ADCCOM.Wherein, array
Sampled value in ADCLSB is used to carry out average filter and RC filtering.Sampled value in array ADCCOM is used to judge the change of signal
Change situation.The length of array ADCCOM is less than the length of array ADCLSB.In actual use, the length one of array ADCCOM
As be taken as 4, but be not limited to 4.After preservation, single-chip microcomputer is judged the sampled value in array ADCCOM, judges sampling therein
Which is worth for interference value, which is normal value.If sampled value is interference value, normal value is replaced with, and update array
Analog value in ADCLSB, is glitch-free value with ensure to store in array ADCLSB.In the present invention, using present sample
Value replaces interference value.
The length for setting array ADCCOM is d, then obtain sentencing for sampled value in current array ADCCOM by following rule
Disconnected value：
If ADCCOM [i] represents the i+1 value in array ADCCOM；
If | ADCCOM [1]-ADCCOM [0] |>N sets up, then the judged result of the situation is designated as into 1, otherwise be designated as 0；
If | ADCCOM [2]-ADCCOM [0] |>N sets up, then the judged result of the situation is designated as into 1, otherwise be designated as 0；
By that analogy,
If | ADCCOM [d-1]-ADCCOM [0] |>N sets up, then the judged result of the situation is designated as into 1, otherwise be designated as 0.
Above-mentioned d-1 judged result is combined successively can obtain the judgement of sampled value in current number group ADCCOM
Value.
Wherein, n is a setting value, is determined by daily experience value, usually the 1/ of on-site signal maximum AD sampled values
100, but not limited to this value.As long as the n of the interference value in sampled value can be removed effectively, can choose.If sampling value changes are more than
N, then it is assumed that signal there occurs change due to interference or signal normal variation, and be identified by A/D converter circuit.
The judgment value of the sampled value in the current array ADCCOM that analysis is obtained, judges that the change of sampled value turns to interference still
The normal variation of signal.Generally, the change of sampled value is judged according to following rules：
If the significant change of sampled value occurs in the centre of array ADCCOM, then it is assumed that the sampled value of significant change is interference
Value；When updating array ADCCOM, interference value is rejected, and replace interference value with current sample values, then by the in array ADCCOM
One data is thrown away, and successively to reach, last data uses current AD sample value to data below, and updates array
Analog value in ADCLSB.
If the sampled value in whole array ADCCOM there occurs significant change, then it is assumed that be the normal variation of signal；More
During new array, make all of data in array ADCCOM into current AD sample value, and update the analog value in array ADCLSB.
In other cases, then it is assumed that the normal variation of interference or signal cannot be judged, must wait judge next time；More
During new array ADCCOM, first data in array ADCCOM are thrown away, data below successively to reach, last number
According to using current AD sample value；Array ADCLSB keeps constant.
Specifically, it is assumed that the length of array ADCCOM is 4, then judgment rule is as follows：
If | ADCCOM [1]-ADCCOM [0] |>N is set up, then the judged result of the situation is designated as 1 by single-chip microcomputer, otherwise is remembered
It is 0；
If | ADCCOM [2]-ADCCOM [0] |>N is set up, then the judged result of the situation is designated as 1 by single-chip microcomputer, otherwise is remembered
It is 0；
If | ADCCOM [3]-ADCCOM [0] |>N is set up, then the judged result of the situation is designated as 1 by single-chip microcomputer, otherwise is remembered
It is 0.
The combination of above-mentioned triad code is the judgment value of the sampled value in array ADCCOM.Specifically, judgment value
There are following 8 kinds of combined results：
000：Now, without significant change, single-chip microcomputer updates for ADCCOM [0], ADCCOM [1], ADCCOM [2], ADCCOM [3]
Array ADCCOM, waits judge next time.
001：Now ADCCOM [0], ADCCOM [1], ADCCOM [2] are without significant change, and ADCCOM [3] changes are obvious, but
The normal variation that it is interference or signal can not be judged, single-chip microcomputer updates array ADCCOM, wait judge next time.
010：Now ADCCOM [0], ADCCOM [1], ADCCOM [3] are without significant change, and ADCCOM [2] changes are obvious.By
Changed in centre in data, it can be determined that ADCCOM [2] is interference data, rejects the data, and replace with ADCCOM
[3], single-chip microcomputer updates array ADCCOM, while feeding back to array ADCLSB.
011：Now ADCCOM [0], ADCCOM [1] are without significant change, and ADCCOM [2], ADCCOM [3] change are obvious, but
The normal variation that it is interference or signal can not be judged, single-chip microcomputer updates array ADCCOM, wait judge next time.
100：Now ADCCOM [0], ADCCOM [2], ADCCOM [3] are without significant change, and ADCCOM [1] changes are obvious.By
Changed in centre in data, it can be determined that ADCCOM [1] is interference data, rejects the data, and replace with ADCCOM
[3], single-chip microcomputer updates array ADCCOM, while feeding back to array ADCLSB.
101：Now ADCCOM [0] and ADCCOM [2] is without significant change, and ADCCOM [1] and ADCCOM [3] changes are obvious.
Because data change in middle and ending, can not now judge that it is interference or the normal variation of signal, single-chip microcomputer
ADCCOM arrays are updated, waits judge next time.
110：Now ADCCOM [1], ADCCOM [2] change is obvious, and ADCCOM [3] changes substantially, can not now not judge
It is interference or signal normal variation, and single-chip microcomputer updates array ADCCOM, waits judge next time.
111：Now ADCCOM [1], ADCCOM [2], ADCCOM [3] changes are obvious, now may determine that on-site signal becomes
Change, retain ADCCOM [0], and the data in ADCCOM [1], ADCCOM [2], ADCCOM [3] are replaced with into current sampling
Value, single-chip microcomputer updates array ADCCOM, while feeding back to array ADCLSB.
Wherein, when array ADCCOM is updated in the case that judgment value is 000-110, by first in array ADCCOM
Data are thrown away, and successively to reach, last data uses current AD sample value to data below.
When array AQDCCOM is updated in the case that judgment value is 111, the data in array ADCCOM are updated to work as
Preceding AD sampled values.
Referring to Figures 1 and 2, the software filtering method of AD samplings of the invention comprises the following steps：
Step S1, judge whether array ADCLSB has expired, if having expired, be transferred to step S5；If not full, step is transferred to
S2；
Step S2, judge whether array ADCCOM has expired, if not full, jump out；If having expired, step S3 is transferred to；
Step S3, the sampled value in array ADCCOM is judged, draw sentencing for sampled value in current array ADCCOM
Disconnected value；
Step S4：Judge that sampled value is interference value or signal normal variation according to judgment value, and update array ADCCOM
With array ADCLSB；
Wherein, in the case where the length of array ADCCOM is for 4, if judgment value is 0,1,3,5,6, then it is assumed that cannot judge
It is interference value or the normal variation of signal, updates array ADCCOM, waits judge next time.
If judgment value is 2,4, then it is assumed that there is interference value, interference value is rejected, and interference value is replaced with current sample values, updated
Array ADCCOM and ADCLSB；
If judgment value is 7, then it is assumed that signal occurs normal variation, array ADCCOM and array ADCLSB is updated.
Step S5, the data in array ADCLSB are carried out digital averaging filtering and RC filtering, so as to obtain final AD
Sampled value.
In sum, the software filtering method of AD of the invention sampling easily realize, respond soon, anti-interference it is high, and can have
Effect ground suppresses noise.So, the present invention effectively overcomes various shortcoming of the prior art and has high industrial utilization.
The above-described embodiments merely illustrate the principles and effects of the present invention, not for the limitation present invention.It is any ripe
The personage for knowing this technology all can carry out modifications and changes under without prejudice to spirit and scope of the invention to above-described embodiment.Cause
This, those of ordinary skill in the art is complete with institute under technological thought without departing from disclosed spirit such as
Into all equivalent modifications or change, should be covered by claim of the invention.
Claims (8)
1. a kind of software filtering method that AD samples, the AD sampled values that will be collected are stored in array ADCLSB and array ADCCOM
In, it is characterised in that comprise the following steps：
Step S1, judge whether array ADCLSB has expired, if having expired, be transferred to step S5；If not full, step S2 is transferred to；
Step S2, judge whether array ADCCOM has expired, if not full, jump out；If having expired, step S3 is transferred to；
Step S3, the sampled value in array ADCCOM is judged, draw the judgment value of sampled value in current array ADCCOM；
Step S4：Judge that sampled value is interference value or signal normal variation according to judgment value, and update array ADCCOM sums
Group ADCLSB；
Step S5, the data in array ADCLSB are carried out with digital averaging filtering and RC filtering, so as to obtain final AD samplings
Value.
2. the software filtering method that AD according to claim 1 samples, it is characterised in that：In step S4, if cannot judge
The change of data turns to the normal variation of interference or signal, then update array ADCCOM and ADCLSB, waits judge next time；If sentencing
A certain data of breaking are interference value, then reject interference value, and replace interference value with current sample values, update array ADCCOM and
ADCLSB；If judging, the change of data turns to signal and normal variation occurs, and updates array ADCCOM and array ADCLSB.
3. the software filtering method that AD according to claim 1 samples, it is characterised in that：The length of array ADCCOM is small
In the length of array ADCLSB.
4. the software filtering method that AD according to claim 1 samples, it is characterised in that：In step S3, array is set
The length of ADCCOM is d, then the judgment value of sampled value in current array ADCCOM is obtained by following rule：
If ADCCOM [i] represents the i+1 value in array ADCCOM；I=0,1 ... d-1；
If | ADCCOM [1]-ADCCOM [0] |>N sets up, then the judged result of the situation is designated as into 1, otherwise be designated as 0；
If | ADCCOM [2]-ADCCOM [0] |>N sets up, then the judged result of the situation is designated as into 1, otherwise be designated as 0；
By that analogy,
If | ADCCOM [d-1]-ADCCOM [0] |>N sets up, then the judged result of the situation is designated as into 1, otherwise be designated as 0；
Above-mentioned d-1 judged result is combined successively can obtain the judgment value of sampled value in current number group ADCCOM；
Wherein, n is setting value.
5. the software filtering method that AD according to claim 1 samples, it is characterised in that：In step S4, sentenced by observation
The disconnected situation of change for being worth to sampled value,
If the significant change of sampled value occurs in the centre of array ADCCOM, then it is assumed that the sampled value of significant change is interference value；
If the sampled value in whole array ADCCOM there occurs significant change, then it is assumed that be the normal variation of signal；
In other cases, then it is assumed that the normal variation of interference or signal cannot be judged, must wait judge next time.
6. the software filtering method that AD according to claim 1 samples, it is characterised in that：In step S4, if cannot judge
The change of data turns to the normal variation of interference or signal, then when updating array ADCCOM, by first in array ADCCOM
Data are thrown away, and successively to reach, last data uses current AD sample value to data below；Array ADCLSB keeps not
Become.
7. the software filtering method that AD according to claim 1 samples, it is characterised in that：In step S4, if judging a certain
Data are interference value, then when updating array ADCCOM, reject interference value, and replace interference value with current sample values, then by array
First data in ADCCOM are thrown away, and successively to reach, last data uses current AD sample value to data below, and
Update the analog value in array ADCLSB.
8. the software filtering method that AD according to claim 1 samples, it is characterised in that：In step S4, if judging data
Change turn to signal occur normal variation, then update array when, make all of data in array ADCCOM into current AD sample
Value, and update the analog value in array ADCLSB.
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| CN105353310A (en) * | 2015-08-28 | 2016-02-24 | 陈宇星 | Method and system of discharge detection of storage battery |
| CN106656187A (en) * | 2016-11-25 | 2017-05-10 | 芯海科技（深圳）股份有限公司 | ADC filtering method for small signal de-noising |
| CN106712608B (en) * | 2017-01-20 | 2019-10-15 | 厦门芯阳科技股份有限公司 | A kind of motor rotary speed detection method |
| CN106982044B (en) * | 2017-03-13 | 2021-04-13 | 深圳怡化电脑股份有限公司 | Filtering method and device for head burst signal |
| CN107565930B (en) * | 2017-09-08 | 2020-10-23 | 广州明美新能源股份有限公司 | Filtering method and device for AD sampling |
| CN111325373A (en) * | 2018-12-13 | 2020-06-23 | 汉能移动能源控股集团有限公司 | Method and system for predicting power generation capacity |
| CN114689968A (en) * | 2022-03-16 | 2022-07-01 | 河南翔宇医疗设备股份有限公司 | Filtering method and related device in electromagnetic compatibility test |
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