CN101436853B - Apparatus and method for reducing input noise - Google Patents
Apparatus and method for reducing input noise Download PDFInfo
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- CN101436853B CN101436853B CN2007101860804A CN200710186080A CN101436853B CN 101436853 B CN101436853 B CN 101436853B CN 2007101860804 A CN2007101860804 A CN 2007101860804A CN 200710186080 A CN200710186080 A CN 200710186080A CN 101436853 B CN101436853 B CN 101436853B
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Abstract
The invention relates to a device and a method for reducing input noise. The device is provided with at least one micro controller, and the micro controller at least comprises at least one noise reduction element, at least one analog switch and at least one signal output unit; and by electrifying the noise reduction element which is grounded or connected with one voltage, quantity of electric charge stored in stray capacitances on the analog switch not electrified is converted into a specific value; therefore, the noise of the touch type switch is effectively reduced, and the wiring on a printed circuit board is further saved; and in practical application, the device and the method are not limited by change of the touch type switch mechanism.
Description
Technical field
The present invention relates to a kind of device and method that reduces input noise, be particularly related to and a kind ofly make one to reduce noise element conductive and ground connection or be connected to a voltage, with conducting because of described reduction noise element, to be present in the stray capacitance charge or discharge on the analog switch that is not switched on, make this stray capacitance quantity of electric charge vanishing or become the device and method of the reduction input noise of a particular value.
Background technology
Mechanical key formula input is used in known man-machine interface mostly, and as telephone set, the input of electronic cook wares such as electronic calculator, electromagnetic oven, electric cooker utilizes this kind control technology more, and such technology, has spring, loose contact and the wear problem of Mechanical Contact; And the contact witch of recently popularizing gradually along with technology maturation then can be avoided the input problem of mechanical key formula.But general touch switch, but must on the printed circuit board (PCB) around the contact witch, lay GND or VDD, in the hope of reducing noise, but so not only expend area, also be limited by the variation of mechanism, and when the laying area is subject to the situation generation of entire area and mechanism, on the printed circuit board (PCB) around the contact witch, lay GND or the measure of VDD even done, because lay the area deficiency, and do not reach the effect of expection yet.
Fig. 1 is known contact witch printed circuit board (PCB) 100 schematic diagrames, wherein reticular part 110, be shop GND, or shop VDD, the part of black roundlet, it is tie point 120 with contact witch, to center on each contact witch, therefore can increase the area of printed circuit board (PCB) 100 wirings, often button is when serving as man-machine interface, because of the different needs of mechanism, have different change of shape, if when meeting the situation of above button entire area deficiency, even if want to reach the purpose that reduces signal noise with said method, probably also difficulty reaches.Fig. 2 is the not preceding stray-capacity effect schematic diagram of conducting of analog switch, contact witch 200 connects simulation input unit 210 (or claiming the analog input switch), when analog input unit 210 not before the conducting, the effect of existing stray capacitance 220 exists, the quantity of electric charge of stray capacitance 220 can be different because of the difference of place environment, also can make the time length difference difference of conducting in turn because of a plurality of analog inputs unit 210, because of such input noise, making the user to make different software parameter at different environment sets, also can make and to establish greatlyyer in the range of allowable error of output unit (figure does not show) timing counter that the rear end connect, in other words, must use the bigger timing counter of figure place.
Therefore, how to develop a kind of device and method that reduces input noise, by providing one to reduce the noise element, make its conducting and be connected to ground or be connected in a voltage, with conducting because of described reduction noise element, to be present in the quantity of electric charge vanishing of the stray capacitance on the analog switch that is not switched on or become a particular value, and then reach and reduce the touch switching noise, save the printed circuit board wiring area, in practical application, can not be subject to simultaneously the purpose that this touch switching mechanism changes, will be we to actively inquire into part.
Summary of the invention
The present invention proposes a kind of device and method that reduces input noise, and its main purpose is for solving known touch switch is subject to mechanism design on it is used problem.
The same attitude of the present invention is a kind of device that reduces input noise, comprising: at least one signal input part; At least one RC circuit; And at least one microcontroller.Microcontroller comprises: at least one reduction noise element, and one end and this signal input part join; At least one analog switch, an end of one end and this signal input part and described reduction noise element joins; At least one control unit, it joins with described reduction noise element and described analog switch, with the unlatching of controlling described reduction noise element and described analog switch and close; At least one signal output unit, the other end of one end and described analog switch joins and the other end is connected to an end of described RC circuit; At least one oscillating circuit, the one end is connected to the other end of described RC circuit.Wherein, described reduction noise element is electrically connected to a current potential, and with the conducting because of described reduction noise element, the quantity of electric charge that will be present in the stray capacitance on the described analog switch that is not switched on becomes a particular value.
The device of aforesaid reduction input noise, wherein, this signal input part includes a contact panel or a touch switch.
The device of aforesaid reduction input noise, wherein, described reduction noise element is a switch.
The device of aforesaid reduction input noise, wherein, described reduction noise element is a MOS (metal-oxide-semiconductor) memory.
The device of aforesaid reduction input noise, wherein, described microcontroller also includes at least one timing counter, with signal by described signal output unit output, variation through described RC circuit makes described oscillating circuit produce the vibration of different frequency, and then makes described counter produce the counting of different frequency.
The device of aforesaid reduction input noise, wherein, described reduction noise element ground connection with the conducting by described reduction noise element, will be present in the quantity of electric charge vanishing of the stray capacitance on the described analog switch that is not switched on.
The device of aforesaid reduction input noise, wherein, described reduction noise element is connected to a specific voltage, and with the conducting by described reduction noise element, the quantity of electric charge that will be present in the stray capacitance on the described analog switch that is not switched on becomes this particular value.
The device of aforesaid reduction input noise, wherein, described control unit is with the unlatching of software control described reduction noise element and described analog switch and close.
The device of aforesaid reduction input noise, wherein, described control unit is controlled the unlatching of described reduction noise element and described analog switch with firmware and is closed.
Another sample attitude of the present invention is a kind of method that reduces input noise, comprises the following steps:
(1) provides a microcontroller, it comprises: at least one reduction noise element, at least one analog switch and at least one signal output unit, one end and a signal input part of wherein said reduction noise element join, one end of one end of described analog switch and this signal input part and described reduction noise element joins, the other end of described signal output unit and described analog switch joins, described microcontroller further comprises a control unit, it joins with described reduction noise element and described analog switch, and this control unit is controlled the unlatching of described reduction noise element and described analog switch with software or firmware and closed;
(2) will be connected to the described reduction noise element conductive of a current potential, and, make the quantity of electric charge that is present in the stray capacitance on the described analog switch that is not switched on become a particular value with conducting because of described reduction noise element;
(3) make described reduction noise element open circuit;
(4) make described analog switch conducting, will transfer to this signal output unit from the input signal of this signal input part;
(5) make described analog switch open circuit; And
(6) return step (2).
The method of aforesaid reduction input noise, wherein, described signal input part includes a contact panel or a touch switch.
The method of aforesaid reduction input noise, wherein, described reduction noise element is a switch.
The method of aforesaid reduction input noise, wherein, described reduction noise element is a MOS (metal-oxide-semiconductor) memory.
The method of aforesaid reduction input noise, wherein, described microcontroller further comprises a control unit, it joins with described reduction noise element and described analog switch, and described control unit is controlled the unlatching of described reduction noise element and described analog switch with software or firmware and closed.
Another sample attitude of the present invention is a kind of device that reduces input noise, comprising: at least one signal input part; At least one RC circuit; And at least one microcontroller.Described microcontroller comprises: at least one signal output unit, and an end of one end and described RC circuit joins; At least one analog switch, one end and described signal input part join and the other end of the other end and described signal output unit joins; At least one reduction noise element, the other end of one end and described signal output unit joins; At least one control unit, it joins with described reduction noise element and described analog switch, with the unlatching of controlling described reduction noise element and described analog switch and close; At least one oscillating circuit, the one end is connected to the other end of described RC circuit.Wherein, described reduction noise element is electrically connected to a current potential, and with the conducting because of described reduction noise element, the quantity of electric charge that will be present in the stray capacitance on the described analog switch that is not switched on becomes a particular value.
The device of aforesaid reduction input noise, wherein, described signal input part comprises a contact panel or a touch switch.
The device of aforesaid reduction input noise, wherein, described reduction noise element is a switch.
The device of aforesaid reduction input noise, wherein, described reduction noise element is a MOS (metal-oxide-semiconductor) memory.
The device of aforesaid reduction input noise, wherein, described microcontroller also includes at least one timing counter, with signal by described signal output unit output, variation through described RC circuit makes described oscillating circuit produce the vibration of different frequency, and then makes described counter produce the counting of different frequency.
The device of aforesaid reduction input noise, wherein, described reduction noise element ground connection with the conducting by described reduction noise element, will be present in the quantity of electric charge vanishing of the stray capacitance on the described analog switch that is not switched on.
The device of aforesaid reduction input noise, wherein, described reduction noise element is connected to a specific voltage, and with the conducting by described reduction noise element, the quantity of electric charge that will be present in the stray capacitance on the described analog switch that is not switched on becomes this particular value.
The device of aforesaid reduction input noise, wherein, described control unit is with the unlatching of software control described reduction noise element and described analog switch and close.
The device of aforesaid reduction input noise, wherein, described control unit is controlled the unlatching of described reduction noise element and described analog switch with firmware and is closed.
Another sample attitude of the present invention is a kind of method that reduces input noise, comprises the following steps:
(1) provides a microcontroller, it comprises: at least one reduction noise element, at least one analog switch and at least one signal output unit, one end and the described signal output unit of wherein said reduction noise element join, one end of one end of described analog switch and described signal output unit and described reduction noise element joins, the other end of described analog switch and a signal input part join, described microcontroller further comprises a control unit, it joins with described reduction noise element and described analog switch, and this control unit is controlled the unlatching of described reduction noise element and described analog switch with software or firmware and closed;
(2) make described analog switch conducting, will transfer to described signal output unit from the input signal of described signal input part, and will be connected to the described reduction noise element conductive of a current potential, become a particular value with the quantity of electric charge that will be present in the stray capacitance on the described analog switch that is not switched on;
(3) make described analog switch continue conducting and make described reduction noise element open circuit;
(4) make described analog switch open circuit; And
(5) return step (2).
The method of aforesaid reduction input noise, wherein, described signal input part includes a contact panel or a touch switch.
The method of aforesaid reduction input noise, wherein, described reduction noise element is a switch.
The method of aforesaid reduction input noise, wherein, described reduction noise element is a MOS (metal-oxide-semiconductor) memory.
The method of aforesaid reduction input noise, wherein, described microcontroller further comprises a control unit, and it joins with described reduction noise element and described analog switch, and this control unit is controlled the unlatching of described reduction noise element and described analog switch with software or firmware and closed.
By this, conducting because of described reduction noise element, make and be present in the quantity of electric charge vanishing of the stray capacitance on the described analog switch that is not switched on or become a particular value, and then reach and reduce the touch switching noise, save printed circuit board wiring, in practical application, can not be subject to the purpose of this touch switching mechanism simultaneously.
Description of drawings
Fig. 1 is known contact witch printed circuit board (PCB) schematic diagram.
Fig. 2 is the not preceding stray-capacity effect schematic diagram of conducting of analog switch.
Fig. 3 is a kind of system block diagrams that reduces the preferred specific embodiment of device of input noise of the present invention.
Fig. 4 is a kind of running schematic diagram that reduces the preferred specific embodiment of device of input noise of the present invention, and its explanation is with the situation of described reduction noise element ground connection.
Fig. 5 is a kind of running schematic diagram that reduces the preferred specific embodiment of device of input noise of the present invention, and its explanation is connected to described reduction noise element the situation of one voltage.
The running schematic diagram of another preferred specific embodiment of the device that Fig. 6 reduces input noise for the present invention is a kind of.
Fig. 7 is a kind of flow chart of steps that reduces the method one preferred specific embodiment of input noise of the present invention.
Fig. 8 is a kind of system block diagrams that reduces another preferred specific embodiment of device of input noise of the present invention.
Fig. 9 is a kind of flow chart of steps that reduces another preferred specific embodiment of method of input noise of the present invention.
(1)-(6) be a kind of flow chart of steps number of steps that reduces the method for input noise of the present invention;
(11)-(15) be a kind of flow chart of steps number of steps that reduces the method for input noise of the present invention;
And each description of reference numerals in the above-mentioned accompanying drawing is as follows:
100 printed circuit board (PCB)s
110 reticular parts
120 tie points
200 contact witches
210 analog input unit
220 stray capacitances
2201 stray capacitances
2202 stray capacitances
2203 stray capacitances
300 reduce the device of input noise
310 signal input parts
The 320RC circuit
330 microcontrollers
331 reduce the noise element
3311 reduce the noise element
3312 reduce the noise element
3313 reduce the noise element
332 analog switches
3321 analog switches
3322 analog switches
3323 analog switches
333 control units
334 signal output units
335 oscillating circuits
336 first timing counters
337 second timing counters
Embodiment
For fully understanding purpose of the present invention, feature and effect, now by following specific embodiment, and cooperate appended accompanying drawing, the present invention is described in detail, illustrate as the back:
Fig. 3 is a kind of system block diagrams that reduces the preferred specific embodiment of device of input noise of the present invention.Please refer to Fig. 3, the device 300 of reduction input noise of the present invention comprises: at least one signal input part 310 (for example, contact panel or touch switch, but be not limited thereto); At least one RC circuit 320, wherein, RC circuit 320 is made of at least one resistance and at least one electric capacity; And at least one microcontroller 330.Microcontroller 330 comprises: at least one reduction noise element 331 (it is any type of switch, a MOS (metal-oxide-semiconductor) memory for example, but be not limited thereto), one end and signal input part 310 join; At least one analog switch 332 (this preferred specific embodiment uses an analog switch, but is not limited thereto), an end of one end and signal input part 310 and reduction noise element 331 joins; At least one control unit 333 (this preferred specific embodiment uses a control unit, but is not limited thereto), its with reduce noise element 331 and analog switch 332 and join, and reduce the unlatching of noise element 331 and analog switch 332 and close with software or firmware control; At least one signal output unit 334, the other end of one end and analog switch 332 joins, and the other end is connected to an end of RC circuit 320; At least one oscillating circuit 335 (this preferred specific embodiment uses an oscillating circuit, but is not limited thereto), the one end is connected to the other end of RC circuit 320; And two timing counters.Described two timing counters comprise: one first timing counter 336, and one end and control unit 333 join, and in order to producing a fundamental frequency, and the oscillation source by control unit 333 is with counting; And one second timing counter 337, the one end and first timing counter 336 join and the other end of the other end and oscillating circuit 335 joins, signal by signal output unit 334 output is through the variation of RC circuit 320, and make oscillating circuit 335 produce the vibration of different frequency, and then make second timing counter 337 produce the counting of different frequency.Wherein, first timing counter 336 through a gate time after, can trigger second timing counter 337, second timing counter 337 is interrupted, the content that second timing counter 337 that interrupts can take place for control unit 333 be read and be resolved.
Fig. 4 and Fig. 5 are a kind of running schematic diagram that reduces the preferred specific embodiment of device of input noise of the present invention, and it illustrates described reduction noise element ground connection and the situation that is connected to a voltage respectively.When reducing noise element 331 ground connection (as shown in Figure 4), owing to reduce the conducting of noise element 331, the electric charges in the stray capacitance 220 that is present on the analog switch 332 that is not switched on can be discharged, make the quantity of electric charge vanishing of stray capacitance 220.And be connected to a voltage (V when reducing noise element 331
DD) time (as shown in Figure 5) owing to reduce the conducting of noise element 331, electric charge will be in the two electrodes accumulation of the stray capacitance 220 on the analog switch 332 that is not switched on, making the potential difference of 220 liang of electrodes of stray capacitance become a particular value (is V
DD).By the function mode of above-mentioned preferred specific embodiment, can reach and reduce the touch switching noise, save the printed circuit board wiring area, in practical application, can not be subject to the purpose that this touch switching mechanism changes simultaneously.
Fig. 6 is a kind of running schematic diagram that reduces another preferred specific embodiment of device of input noise of the present invention, its explanation as a plurality of reduction noise elements and a plurality of analog switch in conjunction with the time structure.Please refer to Fig. 6, when first analog switch 3321 conductings, since before reduce noise element 3311 and will be present in stray capacitance 2201 ground connection on the analog switch 3321 that is not switched on, and with the quantity of electric charge vanishing of electric capacity, so the time become low noise signal by the signal of signal input part 3101 input, with all the other analog switches 3322 of time, 3323... for open and reduce noise element 3312,3313... is a ground connection, will be present in the analog switch 3322 that is not switched on, stray capacitance 2202,2203... ground connection and the vanishing on the 3323....And when second analog switch 3322 conducting, since before reduce noise element 3312 and will be present in stray capacitance 2202 ground connection and vanishing on the analog switch 3322 that is not switched on, so the time become low noise signal by the signal of signal input part 3102 input, with all the other analog switches 3321 of time, 3323... for opening and reduction noise element 3311,3313... be ground connection, will be present in the analog switch 3321 that is not switched on, 3323... on stray capacitance 2201,2203... ground connection and vanishing, running makes that each signal by the analog switch input all can be clean so repeatedly transfers to signal output unit 334.The running situation of below described for convenience of description reduction noise element 3311,3312,3313... and described analog switch 3321,3322,3323..., do not show as shown in Figure 3 control unit 333 and related elements among Fig. 6, but the personage of known this skill cooperates Fig. 3 should understand its relevant control operational structures easily, and can utilize one or a plurality of control unit to control the running of described reduction noise element and described analog switch.
Fig. 7 is a kind of method one preferred specific embodiment flow chart of steps that reduces input noise of the present invention.This method may further comprise the steps:
(1) provide a microcontroller, it comprises: at least one reduction noise element (it is any type of switch, for example: a MOS (metal-oxide-semiconductor) memory, but be not limited thereto), at least one analog switch and at least one signal output unit.One end of described reduction noise element and a signal input part are (for example, contact panel or touch switch, but be not limited thereto) join, one end of one end of described analog switch and this signal input part and described reduction noise element joins, and the other end of described signal output unit and described analog switch joins.Wherein, this microcontroller further comprises a control unit, and it joins with described reduction noise element and described analog switch, controls the unlatching of described reduction noise element and described analog switch and closes with software or firmware;
(2) make ground connection or be connected to the described reduction noise element conductive of a voltage,, will be present in the quantity of electric charge vanishing of the stray capacitance on the described analog switch that is not switched on or become a particular value with conducting because of described reduction noise element;
(3) make described reduction noise element open circuit;
(4) make described analog switch conducting, will transfer to this signal output unit from the input signal of this signal input part;
(5) make described analog switch open circuit; And
(6) return step (2).
What need further specify is, the implementing procedure of Fig. 7 is to contrast to Fig. 6, and analog switch is complementary state with the open and close that reduce the noise element.That is to say, when a certain analog switch for closing so that signal is passed to signal output unit 334 by signal input part 3101, with the reduction noise element of its collocation must be for opening; Otherwise, when an analog switch when opening, with the reduction noise element of its collocation must be for closing, with the quantity of electric charge of the stray capacitance on the analog switch that will not be switched on, the vanishing or become a particular value by the reduction noise element that is switched on.
Fig. 8 is a kind of system block diagrams that reduces another preferred specific embodiment of device of input noise of the present invention.Please refer to Fig. 8, the device 300 of reduction input noise of the present invention comprises: at least one signal input part 310 (for example, contact panel or touch switch, but be not limited thereto); At least one RC circuit 320, wherein, the RC circuit is made of at least one resistance and at least one electric capacity; And at least one microcontroller 330.Microcontroller 330 comprises: at least one signal output unit 334, and an end of one end and RC circuit 320 joins; At least one analog switch 332, one end and signal input part 310 join and the other end of the other end and signal output unit 334 joins; At least one reduction noise element 331 (it is any type of switch, for example: and a MOS (metal-oxide-semiconductor) memory, but be not limited thereto), the other end of one end and signal output unit 334 joins; At least one control unit 333 (originally preferred specific embodiment uses a control unit, but is not limited thereto), it joins with reduction noise element 331 and analog switch 332, to control the unlatching that reduces noise element 331 and analog switch 332 and to close; At least one oscillating circuit 335, the one end is connected to the other end of RC circuit 320; And two timing counters.Described two timing counters comprise: one first timing counter 336, and one end and control unit 333 join, and first timing counter 336 produces a fundamental frequency, and the oscillation source by control unit 333 is with counting; And one second timing counter 337, the one end and first timing counter 336 join and the other end of the other end and oscillating circuit 335 joins, signal by signal output unit 334 output is through the variation of RC circuit 320, and make oscillating circuit 335 produce the vibration of different frequency, and then make second timing counter 337 produce the counting of different frequency.Wherein, first timing counter 336 through a gate time after, can trigger second timing counter 337, second timing counter 337 is interrupted, the content that second timing counter 337 that interrupts can take place for control unit 333 be read and be resolved.
Fig. 9 is a kind of flow chart of steps that reduces another preferred specific embodiment of method of input noise of the present invention.Wherein this method may further comprise the steps:
(11) provide a microcontroller, it comprises: (it is any type of switch at least one reduction noise element, for example: a MOS (metal-oxide-semiconductor) memory, but be not limited thereto), at least one analog switch and at least one signal output unit, one end and this signal output unit of wherein said reduction noise element join, one end of one end of described analog switch and this signal output unit and described reduction noise element joins, the other end of described analog switch and a signal input part are (for example, contact panel or touch switch, but be not limited thereto) join.This microcontroller further comprises a control unit, and it joins with described reduction noise element and described analog switch, controls the unlatching of described reduction noise element and described analog switch and closes with software or firmware;
(12) make described analog switch conducting, will transfer to this signal output unit from the input signal of this signal input part, simultaneously with ground connection or be connected to the also conducting of described reduction noise element of a voltage, with conducting, will be present in the quantity of electric charge vanishing of the stray capacitance on the analog switch that is not switched on or become a particular value because of described reduction noise element;
(13) make described analog switch continue conducting and make described reduction noise element open circuit;
(14) make described analog switch open circuit; And
(15) return step (12).
What need further specify is, the implementing procedure of Fig. 9 is to contrast to Fig. 8, when a certain analog switch conducting with when signal input 310 transfers to signal output unit 334 or afterwards with signal, reduce by the 331 also conductings of noise element, the quantity of electric charge with the stray capacitance on the analog switch that will not be switched on, the vanishing or become a particular value by the reduction noise element 331 that is switched on, then in open reduce noise element 331 after, open pent analog switch originally again.
By this, to be present in the stray capacitance on the analog switch that is not switched on, conducting because of described reduction noise element, make this stray capacitance quantity of electric charge vanishing or become a particular value, and then reach and reduce the touch switching noise, save printed circuit board wiring, in practical application, can not be subject to the purpose that this touch switching mechanism changes simultaneously.
Can clearly understand by the above, the invention provides a kind of device and method that reduces input noise, by a reduction noise element being provided and making its ground connection or be connected to a voltage, with conducting because of described reduction noise element, to be present in the quantity of electric charge vanishing of the stray capacitance on the analog switch that is not switched on or become a particular value, and then reach and reduce the touch switching noise, save printed circuit board wiring, in practical application, can not be subject to the purpose that the touch switching mechanism changes simultaneously.Therefore, the present invention has possessed novelty and progressive on the angle of patent, has more possessed the usability on the industry on the market, can consider to give a patent.
Below patent application of the present invention is described in detail, but above-described, only be the preferred embodiment of patent application of the present invention, can not limit the scope that patent application of the present invention is implemented.Be that all equalizations of doing according to patent application application range of the present invention change and modify etc., all should still belong in the patent coverage of patent application of the present invention.
Claims (26)
1. device that reduces input noise, it comprises:
At least one signal input part;
At least one RC circuit; And
At least one microcontroller, it comprises:
At least one reduction noise element, one end and this signal input part join;
At least one analog switch, an end of one end and this signal input part and described reduction noise element joins;
At least one control unit, it joins with described reduction noise element and described analog switch, with the unlatching of controlling described reduction noise element and described analog switch and close;
At least one signal output unit, the other end of one end and described analog switch joins, and the other end is connected to an end of described RC circuit; And
At least one oscillating circuit, the one end is connected to the other end of described RC circuit;
Wherein, described reduction noise element is electrically connected to a current potential, and with the conducting because of described reduction noise element, the quantity of electric charge that will be present in the stray capacitance on the described analog switch that is not switched on becomes a particular value.
2. the device of reduction input noise as claimed in claim 1, wherein, this signal input part includes a contact panel or a touch switch.
3. the device of reduction input noise as claimed in claim 1, wherein, described reduction noise element is a switch.
4. the device of reduction input noise as claimed in claim 1, wherein, described reduction noise element is a MOS (metal-oxide-semiconductor) memory.
5. the device of reduction input noise as claimed in claim 1, wherein, described microcontroller also includes at least one timing counter, with signal by described signal output unit output, variation through described RC circuit makes described oscillating circuit produce the vibration of different frequency, and then makes described counter produce the counting of different frequency.
6. the device of reduction input noise as claimed in claim 1, wherein, described reduction noise element ground connection with the conducting by described reduction noise element, will be present in the quantity of electric charge vanishing of the stray capacitance on the described analog switch that is not switched on.
7. the device of reduction input noise as claimed in claim 1, wherein, described reduction noise element is connected to a specific voltage, and with the conducting by described reduction noise element, the quantity of electric charge that will be present in the stray capacitance on the described analog switch that is not switched on becomes this particular value.
8. the device of reduction input noise as claimed in claim 1, wherein, described control unit is with the unlatching of software control described reduction noise element and described analog switch and close.
9. the device of reduction input noise as claimed in claim 1, wherein, described control unit is controlled the unlatching of described reduction noise element and described analog switch with firmware and is closed.
10. method that reduces input noise, it comprises:
(1) provides a microcontroller, it comprises: at least one reduction noise element, at least one analog switch and at least one signal output unit, one end and a signal input part of wherein said reduction noise element join, one end of one end of described analog switch and described signal input part and described reduction noise element joins, the other end of described signal output unit and described analog switch joins, described microcontroller further comprises a control unit, it joins with described reduction noise element and described analog switch, and described control unit is controlled the unlatching of described reduction noise element and described analog switch with software or firmware and closed;
(2) will be connected to the described reduction noise element conductive of a current potential, and, make the quantity of electric charge that is present in the stray capacitance on the described analog switch that is not switched on become a particular value with conducting because of described reduction noise element;
(3) make described reduction noise element open circuit;
(4) make described analog switch conducting, will transfer to described signal output unit from the input signal of described signal input part;
(5) make described analog switch open circuit; And
(6) return step (2).
11. the method for reduction input noise as claimed in claim 10, wherein, described signal input part includes a contact panel or a touch switch.
12. the method for reduction input noise as claimed in claim 10, wherein, described reduction noise element is a switch.
13. the method for reduction input noise as claimed in claim 10, wherein, described reduction noise element is a MOS (metal-oxide-semiconductor) memory.
14. a device that reduces input noise, it comprises:
At least one signal input part;
At least one RC circuit; And
At least one microcontroller, it comprises:
At least one signal output unit, an end of one end and described RC circuit joins;
At least one analog switch, one end and described signal input part join and the other end of the other end and described signal output unit joins;
At least one reduction noise element, the other end of one end and described signal output unit joins;
At least one control unit, it joins with described reduction noise element and described analog switch, with the unlatching of controlling described reduction noise element and described analog switch and close; And
At least one oscillating circuit, the one end is connected to the other end of described RC circuit;
Wherein, described reduction noise element is electrically connected to a current potential, and with the conducting because of described reduction noise element, the quantity of electric charge that will be present in the stray capacitance on the described analog switch that is not switched on becomes a particular value.
15. the device of reduction input noise as claimed in claim 14, wherein, described signal input part comprises a contact panel or a touch switch.
16. the device of reduction input noise as claimed in claim 14, wherein, described reduction noise element is a switch.
17. the device of reduction input noise as claimed in claim 14, wherein, described reduction noise element is a MOS (metal-oxide-semiconductor) memory.
18. the device of reduction input noise as claimed in claim 14, wherein, described microcontroller also includes at least one timing counter, with signal by described signal output unit output, variation through described RC circuit makes described oscillating circuit produce the vibration of different frequency, and then makes described counter produce the counting of different frequency.
19. the device of reduction input noise as claimed in claim 14, wherein, described reduction noise element ground connection with the conducting by described reduction noise element, will be present in the quantity of electric charge vanishing of the stray capacitance on the described analog switch that is not switched on.
20. the device of reduction input noise as claimed in claim 14, wherein, described reduction noise element is connected to a specific voltage, and with the conducting by described reduction noise element, the quantity of electric charge that will be present in the stray capacitance on the described analog switch that is not switched on becomes this particular value.
21. the device of reduction input noise as claimed in claim 14, wherein, described control unit is with the unlatching of software control described reduction noise element and described analog switch and close.
22. the device of reduction input noise as claimed in claim 14, wherein, described control unit is controlled the unlatching of described reduction noise element and described analog switch with firmware and is closed.
23. a method that reduces input noise, it comprises:
(1) provides a microcontroller, it comprises: at least one reduction noise element, at least one analog switch and at least one signal output unit, one end and the described signal output unit of wherein said reduction noise element join, one end of one end of described analog switch and described signal output unit and described reduction noise element joins, the other end of described analog switch and a signal input part join, described microcontroller further comprises a control unit, it joins with described reduction noise element and described analog switch, and this control unit is controlled the unlatching of described reduction noise element and described analog switch with software or firmware and closed;
(2) make described analog switch conducting, will transfer to described signal output unit from the input signal of described signal input part, and will be connected to the described reduction noise element conductive of a current potential, become a particular value with the quantity of electric charge that will be present in the stray capacitance on the described analog switch that is not switched on;
(3) make described analog switch continue conducting and make described reduction noise element open circuit;
(4) make described analog switch open circuit; And
(5) return step (2).
24. the method for reduction input noise as claimed in claim 23, wherein, described signal input part includes a contact panel or a touch switch.
25. the method for reduction input noise as claimed in claim 23, wherein, described reduction noise element is a switch.
26. the method for reduction input noise as claimed in claim 23, wherein, described reduction noise element is a MOS (metal-oxide-semiconductor) memory.
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| CN2007101860804A CN101436853B (en) | 2007-11-15 | 2007-11-15 | Apparatus and method for reducing input noise |
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| CN2007101860804A CN101436853B (en) | 2007-11-15 | 2007-11-15 | Apparatus and method for reducing input noise |
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| CN101436853B true CN101436853B (en) | 2010-07-07 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102339185A (en) * | 2011-08-29 | 2012-02-01 | 深圳贝特莱电子科技有限公司 | Method for restraining noise by using control chip of touch screen |
| TWI463800B (en) * | 2011-11-22 | 2014-12-01 | Inventec Corp | Debounce apparatus and method thereof |
| US9030426B2 (en) * | 2012-05-21 | 2015-05-12 | Innolux Corporation | Method of minimizing charges accumulated at common electrode of display panel |
| CN108631762A (en) * | 2017-03-15 | 2018-10-09 | 台湾类比科技股份有限公司 | Touch-control system for waterproof |
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| US4561002A (en) * | 1982-08-30 | 1985-12-24 | General Electric Company | Capacitive touch switch arrangement |
| US6727721B2 (en) * | 2001-07-13 | 2004-04-27 | Infineon Technologies Ag | Method for switching from a first operating condition of an integrated circuit to a second operating condition of the integrated circuit |
| CN1742433A (en) * | 2003-01-24 | 2006-03-01 | E.G.O.电气设备制造股份有限公司 | Circuit arrangement for a capacitive proximity switch |
| US7218498B2 (en) * | 1999-01-19 | 2007-05-15 | Touchsensor Technologies Llc | Touch switch with integral control circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4561002A (en) * | 1982-08-30 | 1985-12-24 | General Electric Company | Capacitive touch switch arrangement |
| US7218498B2 (en) * | 1999-01-19 | 2007-05-15 | Touchsensor Technologies Llc | Touch switch with integral control circuit |
| US6727721B2 (en) * | 2001-07-13 | 2004-04-27 | Infineon Technologies Ag | Method for switching from a first operating condition of an integrated circuit to a second operating condition of the integrated circuit |
| CN1742433A (en) * | 2003-01-24 | 2006-03-01 | E.G.O.电气设备制造股份有限公司 | Circuit arrangement for a capacitive proximity switch |
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