CN106066431A - Noise detecting method and device - Google Patents
Noise detecting method and device Download PDFInfo
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- CN106066431A CN106066431A CN201610513098.XA CN201610513098A CN106066431A CN 106066431 A CN106066431 A CN 106066431A CN 201610513098 A CN201610513098 A CN 201610513098A CN 106066431 A CN106066431 A CN 106066431A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/26—Measuring noise figure; Measuring signal-to-noise ratio
Abstract
A kind of noise detecting method and device, described noise detecting method includes: controlling end to the input of touch screen provides input control signal；The output control signal produced owing to inputting control signal parasitic capacitance through touch screen is received from the output control terminal of touch screen；Will output control signal demodulation；Calculate the phase changing capacity of output control signal；And judge whether environment noise based on the phase changing capacity exporting control signal.Can effectively distinguish the output control signal that output control signal change that normal touch causes and environment noise cause to change, thus detect and whether there is environment noise.
Description
Technical field
The present invention relates to touch screen field, in particular it relates to noise detecting method and noise detection apparatus.
Background technology
In the touch of touch screen detects, the main mode using amplitude modulation(PAM) is detectd touching the capacitance variations caused
Survey.Specifically, controlling end to the input of touch screen provides input control signal, and described input control signal is on touch screen
After parasitic capacitance, the output control terminal at touch screen is received as output control signal.The amplitude of output control signal characterizes
The capacitance of passed through touch screen parasitic capacitance.When finger touches somewhere on touch screen, parasitic capacitance at this can be changed
Size, therefore can detect finger touch in this place by the amplitude of variation of monitoring output control signal.
But environment often exists various noise, such as charger noise, electric network noise, daylight lamp noise, RF noise etc..This
A little environment noises cause the amplitude exporting control signal change, this output control signal amplitude caused by environment noise occur
Change mixed in together with the output control signal amplitude of variation that touch causes, can disturb the detection touched, thus cause touching
Touch wrong report a little or fail to report.
There is presently no effective method and such environment noise can be detected.
Summary of the invention
In view of this, present disclose provides a kind of noise detecting method and noise-monitoring equipment, normal touch can be distinguished
The output control signal change that the change of output control signal and the environment noise caused causes, thus environment noise detected.
The one side of the disclosure provides a kind of noise detecting method, including: controlling end to the input of touch screen provides defeated
Enter control signal；Receive from the output control terminal of touch screen and produce owing to inputting control signal parasitic capacitance through touch screen
Raw output control signal；Will output control signal demodulation；Calculate the phase changing capacity of output control signal；And based on output
The phase changing capacity of control signal judges whether environment noise.
In certain embodiments, described noise detecting method also includes: after exporting control signal demodulation, calculate defeated
Go out the amplitude of variation amount of control signal, and amplitude of variation amount based on output control signal judges whether touch event, as
Fruit occurs touch event then to perform the step of the described phase changing capacity calculating output control signal.
In certain embodiments, described amplitude of variation amount based on output control signal judges whether touch event bag
Include: if the amplitude of variation amount of output control signal is more than or equal to the amplitude of variation threshold value preset, then judge touch event.
In certain embodiments, phase changing capacity based on output control signal judges whether that environment noise includes:
If the phase changing capacity of output control signal is more than or equal to the phase place change threshold preset, then it is determined that the presence of environment noise.
In certain embodiments, described default phase place change threshold is empirical value or by previous phase changing capacity
The value of calculation carrying out data statistics or data operation and obtain.
In certain embodiments, the phase changing capacity calculating output control signal includes: calculate the phase of output control signal
The absolute value of position and the difference of reference phase is as the phase changing capacity exporting control signal.
In certain embodiments, described reference phase is obtained by following operation: control letter receiving output
After number, output control signal is demodulated, and adjusts the phase place for the signal demodulated, until demodulated output controls
The phase place of signal is in preset range, using the phase place of described demodulated output control signal as reference phase.
In certain embodiments, described noise detecting method also includes: in the case of judging to there is environment noise, according to
The phase changing capacity of output control signal, adjusts the amplitude of output control signal.
Another aspect of the present disclosure provides a kind of noise detection apparatus, including: input control module, for touch screen
Input control end provide input control signal；Output control module, for receiving due to defeated from the output control terminal of touch screen
The output control signal entering control signal parasitic capacitance on touch screen and produce；Demodulation module, for exporting control
Signal demodulates；Phase changing capacity computing module, for calculating the phase changing capacity of output control signal；And noise measuring mould
Block, judges whether environment noise for phase changing capacity based on output control signal.
In certain embodiments, described noise detection apparatus also includes: touch detection module, for output is being controlled letter
Number demodulation after calculate output control signal amplitude of variation amount, and based on output control signal amplitude of variation amount judge whether
There is touch event, if it occur that touch event then makes phase changing capacity computing module calculate the phase place change of output control signal
Amount.
In certain embodiments, described touch detection module is more than or equal to preset in the amplitude of variation amount of output control signal
Amplitude of variation threshold value time judge occur touch event.
In certain embodiments, described noise detection module is more than or equal to preset at the phase changing capacity of output control signal
Phase place change threshold time it is determined that the presence of environment noise.
In certain embodiments, described default phase place change threshold is empirical value or by previous phase changing capacity
The value of calculation carrying out data statistics or data operation and obtain.
In certain embodiments, described phase changing capacity computing module calculates phase place and the reference phase of output control signal
Difference absolute value as output control signal phase changing capacity.
In certain embodiments, described reference phase is obtained by following operation: control letter receiving output
After number, output control signal is demodulated, and adjusts the phase place for the signal demodulated, until demodulated output controls
The phase place of signal is in preset range, using the phase place of described demodulated output control signal as reference phase.
In certain embodiments, described noise detection apparatus also includes: noise reduction module, for judging in noise detection module
In the case of there is environment noise, according to the phase changing capacity of the output control signal that phase changing capacity computing module calculates, come
Adjust the amplitude of the output control signal that output control module receives.
Accompanying drawing explanation
In order to be illustrated more clearly that the technical scheme of the embodiment of the present invention, the accompanying drawing of embodiment will be made simple Jie below
Continue, it should be apparent that, the accompanying drawing in explained below only relates to some embodiments of the present invention, rather than limitation of the present invention.
Fig. 1 a and Fig. 1 b is at the signal ripple without environment noise with the output control signal having under ambient noise conditions respectively
Shape figure；
Fig. 2 a and Fig. 2 b is without environment noise and the signal that has output control signal in the case of environment noise respectively
Vectogram；
Fig. 3 is the flow chart of the noise detecting method according to disclosure embodiment；
Fig. 4 is the flow chart of the noise monitoring method according to disclosure embodiment；And
Fig. 5 is the block diagram of the noise detection apparatus according to disclosure embodiment.
Detailed description of the invention
For making the purpose of the embodiment of the present invention, technical scheme and advantage clearer, below in conjunction with the embodiment of the present invention
Accompanying drawing, the technical scheme of the embodiment of the present invention is carried out clear, complete description.The most described embodiment is the present invention
A part of embodiment rather than whole embodiments.Based on described embodiments of the invention, ordinary skill people
The every other embodiment that member is obtained on the premise of without creative work, broadly falls into the scope of protection of the invention.
In the touch of touch screen detects, controlling end to the input of touch screen provides input control signal, described input control
Signal processed is received as output control signal at the output control terminal of touch screen after the parasitic capacitance on touch screen, in order to
Amplitude of variation based on output control signal detects whether touch event.
Fig. 1 a and Fig. 1 b is at the signal ripple without environment noise with the output control signal having under ambient noise conditions respectively
Shape figure.In fig 1 a, solid line represents the output control signal in the case of no touch event, and dotted line indicates the feelings of touch event
Output control signal under condition.From Fig. 1 a it can be seen that in the case of without environment noise, have touch event and no touch event
In the case of export control signal difference in amplitude be clear and it will be evident that can be sentenced by the change in this amplitude
Break and whether touch event occurs.But, as shown in Figure 1 b, in the case of having ambient noise interference, environment noise cause
The amplitude of variation of output control signal is mixed in together with the amplitude of variation touching the output control signal caused, it is difficult to incite somebody to action the two
Distinguish, thus cause and touch the inaccurate of detection.
In the case of there is no environment noise, when causing the parasitic capacitance on touch screen to change when finger touch,
The amplitude of output control signal can change, but phase place is held essentially constant；And in the case of there is environment noise, output control
Signal processed there will be with the waveform of noise signal and superposes, and causes the amplitude exporting control signal and phase place all can change.
Fig. 2 a and Fig. 2 b is without environment noise and the signal that has output control signal in the case of environment noise respectively
Vectogram, wherein A represents that no touch is without exporting the amplitude of control signal, when A ' indicates touch without environment noise during environment noise
The amplitude of output control signal, A " indicate the amplitude of output control signal when having environment noise that touches,Indicate and make an uproar without environment
The phase place of control signal is exported during sound,The phase place of output control signal when indicating environment noise.As shown in Figure 2 a, if
In the case of not having environment noise, touch event occurs, then the amplitude A exporting control signal becomes A ', and phase place keepsNo
Become.As shown in Figure 2 b, if there is touch event in the case of having environment noise, then output control signal not only amplitude is from A
Become A ", phase place also fromBecome
In consideration of it, embodiment of the disclosure and propose a kind of noise detecting method and device, it can change based on phase place
Change to distinguish and touch the output control signal change that the output control signal change caused causes with environment noise, thus detect
The existence of environment noise.
Fig. 3 is the flow chart of the noise detecting method 100 according to disclosure embodiment.
In step S101, controlling end to the input of touch screen provides input control signal.
In step S102, receive due to input control signal parasitism through touch screen from the output control terminal of touch screen
Electric capacity and the output control signal that produces.
In step S103, will output control signal demodulation.
In step S104, calculate the phase changing capacity of output control signal.In certain embodiments, output control can be calculated
The absolute value of the phase place of signal processed and the difference of reference phase is as the phase changing capacity of described output control signal.Real at some
Executing in example, described reference phase can be obtained by following operation: after receiving output control signal, to output
Control signal is demodulated, and adjusts the phase place for the signal demodulated, until the phase place of demodulated output control signal exists
In preset range, using the phase place of described demodulated output control signal as reference phase.
In step S105, phase changing capacity based on output control signal judges whether environment noise.Such as, if
The phase changing capacity of output control signal more than or equal to the phase place change threshold preset, then it is determined that the presence of environment noise.At some
In embodiment, described default phase place change threshold can be empirical value or by previous phase changing capacity is carried out data system
Meter or data operation and the value of calculation that obtains.
In certain embodiments, noise detecting method 100 can also include: calculates output after step s 103 and controls letter
Number amplitude of variation amount, and based on output control signal amplitude of variation amount judge whether occur touch event, if it occur that touch
Event of touching then performs step S104.In certain embodiments, described amplitude of variation amount based on output control signal judges whether
Touch event is occurred to may include that if the amplitude of variation amount exporting control signal is more than or equal to the amplitude of variation threshold value preset,
Then judge touch event.
In certain embodiments, noise detecting method 100 can also include: in the case of judging to there is environment noise,
According to the phase changing capacity of output control signal, adjust the amplitude of output control signal.
Fig. 4 is the flow chart of the noise monitoring method 200 according to disclosure embodiment.
In step S201, controlling end to the input of touch screen provides input control signal.Such as, this input control signal can
To be sine (sine) ripple or cosine (cosine) ripple of characteristic frequency.
In step S202, receive due to input control signal parasitism through touch screen from the output control terminal of touch screen
Electric capacity and the output control signal that produces.Input control signal is conduct output control signal after parasitic capacitance on touch screen screen
Export from the output control terminal of touch screen.
In step S203, will output control signal demodulation.It is for instance possible to use with input control signal with sine wave frequently
Or cosine wave carries out IO demodulation as the signal for demodulation to this output control signal, thus obtain I component and Q component,
So as the follow-up phase and amplitude knowing output control signal.
In step S204, calculate the amplitude of variation amount of output control signal.For example, it is possible to calculate the width of output control signal
The amplitude of output control signal is also subtracted each other by degree with reference amplitude, using the absolute value of the difference obtained as exporting control signal
Amplitude of variation amount.Described reference amplitude can be default, it is also possible to is self-adaptative adjustment.
In step S205, determine that whether the amplitude of variation amount of output control signal is more than or equal to the amplitude of variation threshold preset
Value, if it is, judge touch event, thus performs step S206 to further determine whether to there is environment noise,
Otherwise it is assumed that there is not touch event, terminate noise detecting process, no longer determine whether whether there is environment noise.This
Sample can effectively judge to touch in detection whether there is ambient noise interference, so that the accuracy touching detection improves.But
Output control signal can not done touch detection in certain embodiments and just carry out noise measuring, i.e. after step S203
Perform step S206 and do not perform step S204 and S205, so can simply directly judge whether environment noise, and
Touch regardless of whether exist.In certain embodiments, amplitude of variation threshold value can be empirical value, it is also possible to by previous
The value of calculation that amplitude of variation amount carries out data statistics or data operation and obtains.
In step S206, calculate the phase changing capacity of output control signal.For example, it is possible to calculate the phase of output control signal
Position, and the phase place of output control signal being subtracted each other with reference value, using the absolute value of difference obtained as exporting control signal
Phase changing capacity.
Reference phase can be default, it is also possible to is self-adaptative adjustment.For example, it is possible to obtained by following operation
Reference phase: after receiving output control signal, such as with sine wave or the cosine wave pair of frequency same with input control signal
Output control signal is demodulated, and adjusts the phase place of this sine wave or cosine wave, until demodulated output control signal
Phase place is the value between 30 to 60 degree, it is therefore preferable to 45 degree, using the phase place of described demodulated output control signal as benchmark
Phase place.This makes to calculate and carries out in phase range the most placed in the middle rather than carry out near 0 degree or 90 degree, is conducive to subtracting
Little calculating error.
In step S207, determine that the phase changing capacity of output control signal is more than or equal to the phase place change threshold preset, as
Fruit is, then perform step S208, otherwise perform step S209.In certain embodiments, above-mentioned phase place change threshold can be through
Test value, it is also possible to be the value of calculation obtained by previous phase changing capacity is carried out data statistics or data operation.
In step S208, it is believed that phase place change causes due to ambient noise interference, it is determined that there is environment noise, then
Method is carried out to step S210.
In step S209, it is believed that phase place change is that normal touch causes, it is determined that there is not environment noise.
In step S210, according to the phase changing capacity of output control signal, adjust the amplitude of output control signal, thus
Reduce the noise impact on output control signal.In certain embodiments, as long as can detect that environment noise just carries out noise reduction.
In other embodiment, can be after environment noise being detected, it is judged that whether the phase changing capacity of output control signal
More than another phase place change threshold, this another phase place change threshold can be more than the phase place change used when detecting noise
Threshold value, if it is, think that output control signal is relatively big by Environmental Noise Influence, carries out noise reduction, otherwise it is assumed that output controls letter
Number less by Environmental Noise Influence, it is not necessary to carry out noise reduction.
Such as, when noise reduction, the amplitude to output control signal can be carried out according to the phase changing capacity of output control signal
Carry out the adjustment of different weight.As example, if the phase changing capacity of output control signal isThen can be by output control
The amplitude of signal processed adjusts Δ A1If phase changing capacity isThen the amplitude of output control signal can be adjusted Δ A2,
By that analogy.As another example, if the phase changing capacity of output control signal existsExtremelyBetween, then can be by defeated
The amplitude going out control signal adjusts Δ A3If the phase changing capacity of output control signal existsExtremelyBetween, then can be by
The amplitude of output control signal adjusts Δ A4, by that analogy.It is only more than example, embodiment of the disclosure and be not limited to
This.
Fig. 5 is the block diagram of the noise detection apparatus 300 according to disclosure embodiment.
As it is shown in figure 5, noise detection apparatus 300 includes input control module 301, output control module 302, demodulation module
303, phase changing capacity computing module 304 and noise detection module 305.Input control module 301 is for the input of touch screen
Control end and input control signal is provided.Such as, this input control signal can be sine wave or the cosine wave of characteristic frequency.
Output control module 302 is for receiving owing to input control signal is through touch screen from the output control terminal of touch screen
On parasitic capacitance and the output control signal that produces.
Demodulation module 303 is for demodulating output control signal.It is for instance possible to use with input control signal with frequency just
String ripple or cosine wave carry out I/O demodulation as the signal for demodulation to this output control signal, thus obtain I component and Q
Component, in order to the follow-up phase and amplitude knowing output control signal.
Phase changing capacity computing module 304 is for calculating the phase changing capacity of output control signal.Such as, phase changing capacity
Computing module 304 can calculate the phase place of output control signal with the absolute value of the difference of reference phase as output control signal
Phase changing capacity.Reference phase can be default, it is also possible to is self-adaptative adjustment.For example, it is possible to by following operation
Obtain reference phase: described reference phase is obtained by following operation: after receiving output control signal,
Output control signal is demodulated by (such as with sine wave or the cosine wave of frequency same with input control signal), and adjustment is used for solving
The phase place of signal adjusted, until the phase place of demodulated output control signal in preset range (between 30 to 60 degree, preferably
Ground is 45 degree), using the phase place of described demodulated output control signal as reference phase.
Noise detection module 305 judges whether environment noise for phase changing capacity based on output control signal.
Such as, noise detection module 305 can be at the phase changing capacity of output control signal more than or equal to the phase place change threshold preset
Time it is determined that the presence of environment noise, otherwise judge not exist environment noise.As example, default phase place change threshold can be warp
Test value or the value of calculation obtained by previous phase changing capacity is carried out data statistics or data operation.Noise detection module
305 can be with output noise testing result.
In certain embodiments, noise detection apparatus 300 can also include touching detection module 306.
Touch detection module 306 for calculating the amplitude of variation of output control signal after by output control signal demodulation
Amount, and judge whether touch event to occur, if it occur that touch event then makes phase based on the amplitude of variation amount exporting control signal
Position variable quantity computing module 304 calculates the phase changing capacity of output control signal.Such as, touching detection module 306 can be defeated
There is touch event more than or equal to judgement during the amplitude of variation threshold value preset in the amplitude of variation amount going out control signal, makes phase place change
Amount computing module 304 calculates the phase changing capacity of output control signal, otherwise judges not occur touch event, terminates noise measuring
Process.
Touching detection module 306 is optional assembly, can effectively judge to touch inspection in the presence of touching detection module 306
Whether survey exists ambient noise interference, so that the accuracy touching detection improves.But in certain embodiments may not be used
Need to touch detection module 306, so can simply directly judge whether environment noise, touch regardless of whether exist
Touch.
In certain embodiments, noise detection apparatus 300 can also include noise reduction module 307.
Noise reduction module 307, in the case of judging to there is environment noise in noise detection module 305, changes according to phase place
The phase changing capacity of the output control signal that amount computing module 304 calculates, adjusts the output that output control module 302 receives
The amplitude of control signal.In certain embodiments, as long as noise reduction module 307 can detect that environment noise just carries out noise reduction.?
In other embodiment, noise reduction module 307 can be after detecting environment noise, it is judged that the phase place of output control signal becomes
Whether change amount is more than another phase place change threshold, and this another phase place change threshold can be more than the use when detecting noise
Phase place change threshold, if it is, think that output control signal is relatively big by Environmental Noise Influence, carries out noise reduction, otherwise it is assumed that defeated
Go out control signal less by Environmental Noise Influence, it is not necessary to carry out noise reduction.Another phase place change threshold described can be empirical value,
It can also be the value of calculation obtained by previous phase changing capacity is carried out data statistics or data operation.
Such as, when for there is environment noise in the noise measuring result of noise detection module 305, noise detection module 305
Can trigger noise reduction module 307 to start working, the phase place that noise reduction module 307 receives from phase changing capacity computing module 304 becomes
Change amount also receives the output control signal from output control module 302, comes output control signal according to phase changing capacity
Amplitude carries out the adjustment of different weight.As example, if the phase changing capacity of output control signal isThen can be by defeated
The amplitude going out control signal adjusts Δ A1If phase changing capacity isThen the amplitude of output control signal can be adjusted Δ
A2, by that analogy.As another example, if the phase changing capacity of output control signal existsExtremelyBetween, then can be by
The amplitude of output control signal adjusts Δ A3If the phase changing capacity of output control signal existsExtremelyBetween, the most permissible
The amplitude of output control signal is adjusted Δ A4, by that analogy.It is only more than example, embodiment of the disclosure and be not limited to
This.Noise reduction module 307 can export the output control signal through noise reduction, for using in the future.
Noise reduction module 307 is also optional assembly, when there is noise reduction module 307, is possible not only to detect environment noise, also
The environment noise impact on output control signal can be reduced, thus provide output more accurately to control result.
Embodiment of the disclosure and can be realized by software, hardware, firmware or a combination thereof.Such as, disclosure embodiment can
To be realized by touch screen control chip, it is also possible to real by any other calculating equipment with above-mentioned noise measuring ability
Existing.
Disclosure embodiment make use of and carries out noise measuring based on phase invariant characteristic under amplitude modulation(PAM).When finger touches
When causing touch screen parasitic capacitance to change, the amplitude of output control signal can change, but phase place is held essentially constant；
And when on environment noise is added to output control signal, output control signal there will be with the waveform of noise signal and superposes, lead
The amplitude and the phase place that cause output control signal all can change.Disclosure embodiment is by the phase place of monitoring output control signal
Change, can effectively distinguish and touch the output control signal change that the output control signal change caused causes with environment noise,
Thus environment noise detected.
Embodiment of the disclosure and can carry out noise measuring again after judging touch event, this can help to improve
Touch the accuracy of detection, it is to avoid because ambient noise interference causes the wrong report of touch point and fails to report.On the other hand the reality of the disclosure
Executing example and directly can also carry out noise measuring regardless of whether there is touch event, this can provide a kind of simple and effective noise
Detection mode, no matter whether touch screen is touched, and can know whether to there is environment noise.
Embodiment of the disclosure that the reference phase used when calculating phase changing capacity can be self-adaptative adjustment, this has
It is beneficial to reduce and calculates error.
Embodiment of the disclosure in the case of environment noise being detected, can be according to the phase place change of output control signal
Amount adjusts the amplitude of output control signal, thus reduces the noise impact on output control signal.
The above is only the exemplary embodiment of the present invention, not for limiting the scope of the invention, this
Bright protection domain is determined by appended claim.
Claims (16)
1. a noise detecting method, including:
Control end to the input of touch screen and input control signal is provided；
Produce due to input control signal parasitic capacitance through touch screen defeated is received from the output control terminal of touch screen
Go out control signal；
Will output control signal demodulation；
Calculate the phase changing capacity of output control signal；And
Phase changing capacity based on output control signal judges whether environment noise.
Noise detecting method the most according to claim 1, also includes: after exporting control signal demodulation, calculate defeated
Go out the amplitude of variation amount of control signal, and amplitude of variation amount based on output control signal judges whether touch event, as
Fruit occurs touch event then to perform the step of the described phase changing capacity calculating output control signal.
Noise detecting method the most according to claim 2, wherein, described amplitude of variation amount based on output control signal is sentenced
Whether occur touch event include: if the amplitude of variation amount of output control signal is more than or equal to the amplitude of variation threshold preset if breaking
Value, then judge touch event.
Noise detecting method the most according to claim 1, wherein, phase changing capacity judgement based on output control signal is
The no environment noise that exists includes: if the phase changing capacity of output control signal is more than or equal to the phase place change threshold preset, then
It is determined that the presence of environment noise.
Noise detecting method the most according to claim 4, wherein, described default phase place change threshold is empirical value or logical
Cross the value of calculation previous phase changing capacity being carried out data statistics or data operation and obtain.
Noise detecting method the most according to claim 1, wherein, the phase changing capacity calculating output control signal includes:
Calculate the phase place of output control signal and the absolute value of the difference of reference phase as the phase changing capacity exporting control signal.
The most according to claim 6, the noise detecting method judged, wherein, described reference phase is to be obtained by following operation
To: after receiving output control signal, output control signal is demodulated, and adjusts the phase for the signal demodulated
Position, until the phase place of demodulated output control signal is in preset range, by the phase of described demodulated output control signal
Position is as reference phase.
8. according to the noise detecting method described in claim any one of claim 1 to 7, also include: there is ring in judgement
In the case of the noise of border, according to the phase changing capacity of output control signal, adjust the amplitude of output control signal.
9. a noise detection apparatus, including:
Input control module, provides input control signal for controlling end to the input of touch screen；
Output control module, for receiving due to input control signal posting through touch screen from the output control terminal of touch screen
The output control signal giving birth to electric capacity and produce；
Demodulation module, for demodulating output control signal；
Phase changing capacity computing module, for calculating the phase changing capacity of output control signal；And
Noise detection module, judges whether environment noise for phase changing capacity based on output control signal.
Noise detection apparatus the most according to claim 9, also includes: touch detection module, for output is being controlled letter
Number demodulation after calculate output control signal amplitude of variation amount, and based on output control signal amplitude of variation amount judge whether
There is touch event, if it occur that touch event then makes phase changing capacity computing module calculate the phase place change of output control signal
Amount.
11. noise detection apparatus according to claim 10, wherein, described touch detection module is in output control signal
Judge touch event when amplitude of variation amount is more than or equal to the amplitude of variation threshold value preset.
12. noise detection apparatus according to claim 9, wherein, described noise detection module is in output control signal
Environment noise is it is determined that the presence of when phase changing capacity is more than or equal to the phase place change threshold preset.
13. noise detection apparatus according to claim 12, wherein, described default phase place change threshold be empirical value or
The value of calculation obtained by previous phase changing capacity is carried out data statistics or data operation.
14. noise detection apparatus according to claim 9, wherein, described phase changing capacity computing module calculates output control
The absolute value of the phase place of signal processed and the difference of reference phase is as the phase changing capacity of output control signal.
15. methods according to claim 14, wherein, described reference phase is obtained by following operation: connecing
After receiving output control signal, output control signal is demodulated, and adjusts the phase place for the signal demodulated, until warp
The phase place of the output control signal of demodulation is in preset range, using the phase place of described demodulated output control signal as benchmark
Phase place.
16., according to the noise detection apparatus described in claim any one of claim 9 to 15, also include: noise reduction module, use
In the case of judging to there is environment noise in noise detection module, control according to the output that phase changing capacity computing module calculates
The phase changing capacity of signal, adjusts the amplitude of the output control signal that output control module receives.
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| CN112528585A (en) * | 2020-12-17 | 2021-03-19 | 北京集创北方科技股份有限公司 | Noise detection method and circuit |
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