CN106066431B - Noise detection method and device - Google Patents
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- CN106066431B CN106066431B CN201610513098.XA CN201610513098A CN106066431B CN 106066431 B CN106066431 B CN 106066431B CN 201610513098 A CN201610513098 A CN 201610513098A CN 106066431 B CN106066431 B CN 106066431B
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Abstract
A noise detection method and apparatus, the noise detection method comprising: providing an input control signal to an input control end of the touch screen; receiving an output control signal generated by the input control signal passing through a parasitic capacitance on the touch screen from an output control terminal of the touch screen; demodulating the output control signal; calculating the phase variation of the output control signal; and determining whether there is ambient noise based on the amount of phase change of the output control signal. The output control signal change caused by normal touch and the output control signal change caused by environmental noise can be effectively distinguished, and whether the environmental noise exists or not is detected.
Description
Technical Field
The present invention relates to the field of touch screens, and in particular, to a noise detection method and a noise detection apparatus.
Background
In touch detection of a touch screen, capacitance change caused by touch is mainly detected in an amplitude modulation mode. Specifically, an input control signal is provided to an input control terminal of the touch screen, and the input control signal is received as an output control signal at an output control terminal of the touch screen after passing through a parasitic capacitance on the touch screen. The amplitude of the output control signal is indicative of the capacitance of the parasitic capacitance of the touch screen through which it passes. When a finger touches a certain position on the touch screen, the size of the parasitic capacitance at the position can be changed, so that the touch of the finger at the position can be detected by monitoring the amplitude change of the output control signal.
Various noises such as charger noise, power grid noise, fluorescent lamp noise, RF noise and the like often exist in the environment. The amplitude of the output control signal is changed due to the environmental noise, and the amplitude change of the output control signal caused by the environmental noise and the amplitude change of the output control signal caused by touch are mixed together, so that the detection of the touch is interfered, and the false alarm or the false alarm of the touch point is caused.
There is currently no effective way to detect such ambient noise.
Disclosure of Invention
In view of the above, the present disclosure provides a noise detection method and a noise monitoring apparatus, which can distinguish a change in an output control signal caused by a normal touch from a change in the output control signal caused by an environmental noise, thereby detecting the environmental noise.
An aspect of the present disclosure provides a noise detection method, including: providing an input control signal to an input control end of the touch screen; receiving an output control signal generated by the input control signal passing through a parasitic capacitance on the touch screen from an output control terminal of the touch screen; demodulating the output control signal; calculating the phase variation of the output control signal; and determining whether there is ambient noise based on the amount of phase change of the output control signal.
In some embodiments, the noise detection method further comprises: after demodulating the output control signal, calculating an amplitude variation of the output control signal, and determining whether a touch event occurs based on the amplitude variation of the output control signal, the step of calculating a phase variation of the output control signal being performed if the touch event occurs.
In some embodiments, the determining whether the touch event occurs based on the magnitude change amount of the output control signal includes: and if the amplitude variation of the output control signal is greater than or equal to a preset amplitude variation threshold value, judging that the touch event occurs.
In some embodiments, determining whether the ambient noise is present based on the amount of phase change of the output control signal comprises: and if the phase variation of the output control signal is larger than or equal to a preset phase variation threshold value, judging that the environmental noise exists.
In some embodiments, the preset phase change threshold is an empirical value or a calculated value obtained by performing data statistics or data operations on previous phase change amounts.
In some embodiments, calculating the amount of phase change of the output control signal comprises: an absolute value of a difference between the phase of the output control signal and the reference phase is calculated as a phase change amount of the output control signal.
In some embodiments, the reference phase is obtained by: after receiving the output control signal, demodulating the output control signal, and adjusting a phase of a signal for demodulation until the phase of the demodulated output control signal is within a predetermined range, the phase of the demodulated output control signal being taken as a reference phase.
In some embodiments, the noise detection method further comprises: and under the condition that the environmental noise exists, adjusting the amplitude of the output control signal according to the phase variation of the output control signal.
Another aspect of the present disclosure provides a noise detection apparatus, including: the input control module is used for providing input control signals for an input control end of the touch screen; the output control module is used for receiving an output control signal generated by the input control signal passing through a parasitic capacitor on the touch screen from the output control end of the touch screen; the demodulation module is used for demodulating the output control signal; the phase variation calculating module is used for calculating the phase variation of the output control signal; and a noise detection module for judging whether there is environmental noise based on the phase variation of the output control signal.
In some embodiments, the noise detection apparatus further comprises: and the touch detection module is used for calculating the amplitude variation of the output control signal after demodulating the output control signal, judging whether a touch event occurs or not based on the amplitude variation of the output control signal, and enabling the phase variation calculation module to calculate the phase variation of the output control signal if the touch event occurs.
In some embodiments, the touch detection module determines that a touch event occurs when the magnitude change amount of the output control signal is greater than or equal to a preset magnitude change threshold.
In some embodiments, the noise detection module determines that the environmental noise exists when a phase change amount of the output control signal is equal to or greater than a preset phase change threshold.
In some embodiments, the preset phase change threshold is an empirical value or a calculated value obtained by performing data statistics or data operations on previous phase change amounts.
In some embodiments, the phase change amount calculation module calculates an absolute value of a difference between the phase of the output control signal and a reference phase as the phase change amount of the output control signal.
In some embodiments, the reference phase is obtained by: after receiving the output control signal, demodulating the output control signal, and adjusting a phase of a signal for demodulation until the phase of the demodulated output control signal is within a predetermined range, the phase of the demodulated output control signal being taken as a reference phase.
In some embodiments, the noise detection apparatus further comprises: and the noise reduction module is used for adjusting the amplitude of the output control signal received by the output control module according to the phase variation of the output control signal calculated by the phase variation calculation module under the condition that the noise detection module judges that the environmental noise exists.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly described below, and it is apparent that the drawings in the following description only relate to some embodiments of the present invention and are not limiting on the present invention.
FIGS. 1a and 1b are schematic waveform diagrams of an output control signal in the absence and presence of ambient noise, respectively;
fig. 2a and 2b are schematic vector diagrams of an output control signal without and with ambient noise, respectively;
FIG. 3 is a flow chart of a noise detection method according to an embodiment of the present disclosure;
FIG. 4 is a flow chart of a noise monitoring method according to an embodiment of the present disclosure; and
fig. 5 is a block diagram of a noise detection apparatus according to an embodiment of the present disclosure.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, are within the scope of protection of the invention.
In touch detection of a touch screen, an input control signal is provided to an input control terminal of the touch screen, and the input control signal is received as an output control signal at an output control terminal of the touch screen after passing through a parasitic capacitance on the touch screen, so as to detect whether a touch event occurs based on an amplitude change of the output control signal.
Fig. 1a and 1b are schematic waveform diagrams of an output control signal in the absence and presence of ambient noise, respectively. In fig. 1a, a solid line indicates an output control signal in the case of no touch event, and a dotted line indicates an output control signal in the case of a touch event. As can be seen from fig. 1a, in the absence of ambient noise, the difference in amplitude between the touch event and the no-touch event is clear and distinct, and the change in amplitude can be used to determine whether a touch event occurs. However, as shown in fig. 1b, in the case of ambient noise interference, the amplitude variation of the output control signal caused by the ambient noise is mixed with the amplitude variation of the output control signal caused by touch, and it is difficult to distinguish the two, thereby causing inaccuracy of touch detection.
Under the condition of no environmental noise, when the parasitic capacitance on the touch screen is changed due to finger touch, the amplitude of the output control signal is changed, but the phase is basically kept unchanged; in the presence of environmental noise, the waveforms of the output control signal and the noise signal are superimposed, so that the amplitude and the phase of the output control signal are changed.
Fig. 2a and 2b are schematic vector diagrams of an output control signal in the absence of ambient noise and in the presence of ambient noise, respectively, where a denotes the amplitude of the output control signal in the absence of touch and ambient noise, a' denotes the amplitude of the output control signal in the presence of touch and ambient noise, a "denotes the amplitude of the output control signal in the presence of touch and ambient noise,
representing the phase of the output control signal in the absence of ambient noise,
is shown with a ringAnd outputting the phase of the control signal when the ambient noise exists. As shown in FIG. 2a, if a touch event occurs without ambient noise, the amplitude A of the output control signal becomes A' while the phase remains
And is not changed. As shown in FIG. 2b, if a touch event occurs in the presence of ambient noise, the output control signal not only changes amplitude from A to A ", but also changes phase from A
Become into
In view of this, embodiments of the present disclosure propose a noise detection method and apparatus that can distinguish between a touch-induced output control signal change and an environmental noise-induced output control signal change based on a change in phase, thereby detecting the presence of environmental noise.
Fig. 3 is a flow chart of a noise detection method 100 according to an embodiment of the present disclosure.
In step S101, an input control signal is provided to an input control terminal of the touch screen.
In step S102, an output control signal generated due to the input control signal passing through a parasitic capacitance on the touch screen is received from the output control terminal of the touch screen.
In step S103, the output control signal is demodulated.
In step S104, the amount of phase change of the output control signal is calculated. In some embodiments, an absolute value of a difference of a phase of the output control signal from a reference phase may be calculated as a phase change amount of the output control signal. In some embodiments, the reference phase may be obtained by: after receiving the output control signal, demodulating the output control signal, and adjusting a phase of a signal for demodulation until the phase of the demodulated output control signal is within a predetermined range, the phase of the demodulated output control signal being taken as a reference phase.
In step S105, it is determined whether or not there is environmental noise based on the amount of phase change of the output control signal. For example, if the amount of phase change of the output control signal is equal to or greater than a preset phase change threshold, it is determined that the environmental noise is present. In some embodiments, the preset phase change threshold may be an empirical value or a calculated value obtained by performing data statistics or data operations on previous phase change amounts.
In some embodiments, the noise detection method 100 may further include: the magnitude change amount of the output control signal is calculated after step S103, and it is determined whether a touch event occurs based on the magnitude change amount of the output control signal, and step S104 is performed if the touch event occurs. In some embodiments, the determining whether the touch event occurs based on the magnitude change amount of the output control signal may include: and if the amplitude variation of the output control signal is greater than or equal to a preset amplitude variation threshold value, judging that the touch event occurs.
In some embodiments, the noise detection method 100 may further include: and under the condition that the environmental noise exists, adjusting the amplitude of the output control signal according to the phase variation of the output control signal.
Fig. 4 is a flow chart of a noise monitoring method 200 according to an embodiment of the present disclosure.
In step S201, an input control signal is provided to an input control terminal of the touch screen. For example, the input control signal may be a sine (sine) wave or a cosine (sine) wave of a specific frequency.
In step S202, an output control signal generated due to the input control signal passing through a parasitic capacitance on the touch screen is received from the output control terminal of the touch screen. The input control signal is output from the output control end of the touch screen as an output control signal after passing through the parasitic capacitance on the touch screen.
In step S203, the output control signal is demodulated. For example, a sine wave or a cosine wave having the same frequency as the input control signal may be used as a signal for demodulation to perform IO demodulation on the output control signal, thereby obtaining an I component and a Q component for subsequent knowledge of the phase and amplitude of the output control signal.
In step S204, the amount of change in the amplitude of the output control signal is calculated. For example, the amplitude of the output control signal may be calculated and subtracted from a reference amplitude, and the absolute value of the difference may be used as the amplitude variation of the output control signal. The reference amplitude may be preset or adaptively adjusted.
In step S205, it is determined whether the amplitude variation of the output control signal is greater than or equal to a preset amplitude variation threshold, and if so, it is determined that a touch event occurs, so that step S206 is performed to further determine whether the environmental noise exists, otherwise, it is determined that no touch event occurs, the noise detection process is ended, and no further determination is made as to whether the environmental noise exists. Therefore, whether the environmental noise interference exists in the touch detection can be effectively judged, and the accuracy of the touch detection is improved. However, in some embodiments, noise detection may be performed without touch detection on the output control signal, i.e., step S206 is performed after step S203 without performing steps S204 and S205, so that it is possible to simply and directly determine whether there is ambient noise regardless of whether there is a touch. In some embodiments, the amplitude variation threshold may be an empirical value or a calculated value obtained by performing data statistics or data operations on previous amplitude variation.
In step S206, the amount of phase change of the output control signal is calculated. For example, the phase of the output control signal may be calculated, the phase of the output control signal may be subtracted from a reference value, and the absolute value of the difference may be used as the amount of change in the phase of the output control signal.
The reference phase may be preset or adaptively adjusted. For example, the reference phase may be obtained by: after receiving the output control signal, the output control signal is demodulated, for example with a sine wave or a cosine wave of the same frequency as the input control signal, and the phase of the sine wave or the cosine wave is adjusted until the phase of the demodulated output control signal is a value between 30 and 60 degrees, preferably 45 degrees, with the phase of the demodulated output control signal as the reference phase. This allows the calculation to be performed over a relatively centered phase range, rather than around 0 or 90 degrees, which is advantageous in reducing calculation errors.
In step S207, it is determined that the amount of phase change of the output control signal is equal to or greater than a preset phase change threshold, and if so, step S208 is performed, otherwise, step S209 is performed. In some embodiments, the phase change threshold may be an empirical value or a calculated value obtained by performing data statistics or data operation on the previous phase change amount.
In step S208, considering that the phase change is due to an ambient noise disturbance, it is determined that ambient noise is present, and the method proceeds to step S210.
In step S209, it is determined that there is no environmental noise considering that the phase change is caused by a normal touch.
In step S210, the amplitude of the output control signal is adjusted according to the phase variation of the output control signal, so as to reduce the influence of noise on the output control signal. In some embodiments, noise reduction may be performed whenever ambient noise is detected. In some other embodiments, after detecting the environmental noise, it may be determined whether a phase change amount of the output control signal is greater than another phase change threshold, where the another phase change threshold may be greater than a phase change threshold used in detecting the noise, and if so, the output control signal is considered to be greatly influenced by the environmental noise to perform noise reduction, otherwise, the output control signal is considered to be less influenced by the environmental noise to perform noise reduction.
For example, in noise reduction, the amplitude of the output control signal may be adjusted with different weights according to the amount of phase change of the output control signal. As an example, if the phase of the output control signal varies by an amount of
The amplitude of the output control signal can be adjusted by deltaa1If the phase variation is
The amplitude of the output control signal can be adjusted by deltaa2And so on. As another example, if the phase of the output control signal varies by an amount that is within
To
In between, the amplitude of the output control signal can be adjusted by Δ a3If the phase of the output control signal varies by the amount of
To
In between, the amplitude of the output control signal can be adjusted by Δ a4And so on. The foregoing is merely an example and embodiments of the present disclosure are not limited in this respect.
Fig. 5 is a block diagram of a noise detection apparatus 300 according to an embodiment of the present disclosure.
As shown in fig. 5, the noise detection apparatus 300 includes an input control module 301, an output control module 302, a demodulation module 303, a phase change amount calculation module 304, and a noise detection module 305. The input control module 301 is used for providing an input control signal to an input control terminal of the touch screen. For example, the input control signal may be a sine wave or a cosine wave of a particular frequency.
The output control module 302 is used for receiving an output control signal generated by the input control signal passing through a parasitic capacitance on the touch screen from the output control terminal of the touch screen.
The demodulation module 303 is used for demodulating the output control signal. For example, a sine wave or a cosine wave having the same frequency as the input control signal may be employed as a signal for demodulation to I/O demodulate the output control signal, thereby obtaining an I component and a Q component for subsequent knowledge of the phase and amplitude of the output control signal.
The phase variation calculating module 304 is used for calculating the phase variation of the output control signal. For example, the phase change amount calculation module 304 may calculate an absolute value of a difference between the phase of the output control signal and the reference phase as the phase change amount of the output control signal. The reference phase may be preset or adaptively adjusted. For example, the reference phase may be obtained by: the reference phase is obtained by: after receiving the output control signal, the output control signal is demodulated (for example, with a sine wave or a cosine wave having the same frequency as the input control signal) and the phase of the signal used for demodulation is adjusted until the phase of the demodulated output control signal is within a predetermined range (between 30 and 60 degrees, preferably 45 degrees), taking the phase of the demodulated output control signal as a reference phase.
The noise detection module 305 is configured to determine whether the environmental noise exists based on a phase variation of the output control signal. For example, the noise detection module 305 may determine that the environmental noise exists when the phase change amount of the output control signal is greater than or equal to a preset phase change threshold, and otherwise determine that the environmental noise does not exist. As an example, the preset phase change threshold may be an empirical value or a calculated value obtained by performing data statistics or data operation on the previous phase change amount. The noise detection module 305 may output a noise detection result.
In some embodiments, the noise detection apparatus 300 may further include a touch detection module 306.
The touch detection module 306 is configured to calculate an amplitude variation of the output control signal after demodulating the output control signal, determine whether a touch event occurs based on the amplitude variation of the output control signal, and enable the phase variation calculation module 304 to calculate a phase variation of the output control signal if the touch event occurs. For example, the touch detection module 306 may determine that a touch event occurs when the amplitude variation of the output control signal is greater than or equal to a preset amplitude variation threshold, so that the phase variation calculation module 304 calculates the phase variation of the output control signal, otherwise, determine that no touch event occurs, and end the noise detection process.
The touch detection module 306 is an optional component, and when the touch detection module 306 exists, whether the environmental noise interference exists in the touch detection can be effectively judged, so that the accuracy of the touch detection is improved. However, in some embodiments, the touch detection module 306 may not be needed, and thus may simply and directly determine whether ambient noise is present, regardless of whether a touch is present.
In some embodiments, the noise detection apparatus 300 may further include a noise reduction module 307.
The noise reduction module 307 is configured to adjust the amplitude of the output control signal received by the output control module 302 according to the phase variation of the output control signal calculated by the phase variation calculation module 304 when the noise detection module 305 determines that the environmental noise exists. In some embodiments, the noise reduction module 307 may reduce noise whenever ambient noise is detected. In some other embodiments, the noise reduction module 307 may determine whether the phase variation amount of the output control signal is greater than another phase variation threshold after detecting the environmental noise, where the another phase variation threshold may be greater than a phase variation threshold used in detecting the noise, and if so, consider that the output control signal is greatly influenced by the environmental noise to perform noise reduction, otherwise, consider that the output control signal is less influenced by the environmental noise, and do not need to perform noise reduction. The other phase change threshold may be an empirical value or a calculated value obtained by performing data statistics or data operation on the previous phase change amount.
For example, when the noise detection result of the noise detection module 305 is that there is environmental noise, the noise detection module 305 may trigger the noise reduction module 307 to start operating, where the noise reduction module 307 receives the phase variation from the phase variation calculation module 304 and receives the output control signal from the output control module 302, and adjusts the amplitude of the output control signal by different weights according to the phase variation. As an example, if the phase of the output control signal varies by an amount of
The amplitude of the output control signal can be adjusted by deltaa1If the phase variation is
The amplitude of the output control signal can be adjusted by deltaa2And so on. As another example, if the phase of the output control signal varies by an amount that is within
To
In between, the amplitude of the output control signal can be adjusted by Δ a3If the phase of the output control signal varies by the amount of
To
In between, the amplitude of the output control signal can be adjusted by Δ a4And so on. The foregoing is merely an example and embodiments of the present disclosure are not limited in this respect. The noise reduction module 307 may output the noise reduced output control signal for future use.
The noise reduction module 307 is also an optional component, and when the noise reduction module 307 exists, not only can the ambient noise be detected, but also the influence of the ambient noise on the output control signal can be reduced, so that a more accurate output control result is provided.
Embodiments of the present disclosure may be implemented by software, hardware, firmware, or a combination thereof. For example, the disclosed embodiments may be implemented by a touch screen control chip, or any other computing device having the noise detection capabilities described above.
The disclosed embodiments take advantage of the phase invariant property under amplitude modulation for noise detection. When the parasitic capacitance of the touch screen is changed due to finger touch, the amplitude of the output control signal is changed, but the phase is basically kept unchanged; when the environmental noise is superimposed on the output control signal, the waveforms of the output control signal and the noise signal are superimposed, so that the amplitude and the phase of the output control signal are changed. According to the embodiment of the disclosure, by monitoring the phase change of the output control signal, the output control signal change caused by touch and the output control signal change caused by environmental noise can be effectively distinguished, so that the environmental noise is detected.
The embodiment of the disclosure can perform noise detection after determining that a touch event occurs, which can help improve the accuracy of touch detection and avoid false alarm and false negative alarm of a touch point caused by environmental noise interference. On the other hand, the embodiment of the disclosure can also directly perform noise detection regardless of whether a touch event occurs, which can provide a simple and effective noise detection mode, and whether the touch screen is touched or not can know whether the environmental noise exists or not.
The reference phase adopted by the embodiments of the present disclosure in calculating the phase change amount may be adaptively adjusted, which is advantageous to reduce the calculation error.
The embodiment of the disclosure can adjust the amplitude of the output control signal according to the phase variation of the output control signal when the environmental noise is detected, so as to reduce the influence of the noise on the output control signal.
The above description is intended to be illustrative of the present invention and not to limit the scope of the invention, which is defined by the claims appended hereto.
Claims (14)
1. A noise detection method, comprising:
providing an input control signal to an input control end of the touch screen;
receiving an output control signal generated by the input control signal passing through a parasitic capacitance on the touch screen from an output control terminal of the touch screen;
demodulating the output control signal;
calculating the phase variation of the output control signal;
judging whether environmental noise exists or not based on the phase variation of the output control signal; and
and under the condition that the environmental noise exists, adjusting the corresponding weight of the amplitude of the output control signal according to the phase variation of the output control signal.
2. The noise detection method of claim 1, further comprising: after demodulating the output control signal, calculating an amplitude variation of the output control signal, and determining whether a touch event occurs based on the amplitude variation of the output control signal, the step of calculating a phase variation of the output control signal being performed if the touch event occurs.
3. The noise detection method of claim 2, wherein the determining whether the touch event occurs based on the magnitude change amount of the output control signal comprises: and if the amplitude variation of the output control signal is greater than or equal to a preset amplitude variation threshold value, judging that the touch event occurs.
4. The noise detection method of claim 1, wherein determining whether the ambient noise is present based on the amount of phase change of the output control signal comprises: and if the phase variation of the output control signal is larger than or equal to a preset phase variation threshold value, judging that the environmental noise exists.
5. The noise detection method according to claim 4, wherein the preset phase change threshold is an empirical value or a calculated value obtained by performing data statistics or data operation on a previous phase change amount.
6. The noise detection method of claim 1, wherein calculating the amount of phase change of the output control signal comprises: an absolute value of a difference between the phase of the output control signal and the reference phase is calculated as a phase change amount of the output control signal.
7. The noise detection method of claim 6, wherein the reference phase is obtained by: after receiving the output control signal, demodulating the output control signal, and adjusting a phase of a signal for demodulation until the phase of the demodulated output control signal is within a predetermined range, the phase of the demodulated output control signal being taken as a reference phase.
8. A noise detection apparatus comprising:
the input control module is used for providing input control signals for an input control end of the touch screen;
the output control module is used for receiving an output control signal generated by the input control signal passing through a parasitic capacitor on the touch screen from the output control end of the touch screen;
the demodulation module is used for demodulating the output control signal;
the phase variation calculating module is used for calculating the phase variation of the output control signal;
the noise detection module is used for judging whether environmental noise exists or not based on the phase variation of the output control signal; and
and the noise reduction module is used for adjusting the corresponding weight of the amplitude of the output control signal according to the phase variation of the output control signal under the condition of judging that the environmental noise exists.
9. The noise detection device of claim 8, further comprising: and the touch detection module is used for calculating the amplitude variation of the output control signal after demodulating the output control signal, judging whether a touch event occurs or not based on the amplitude variation of the output control signal, and enabling the phase variation calculation module to calculate the phase variation of the output control signal if the touch event occurs.
10. The noise detection device according to claim 9, wherein the touch detection module determines that the touch event occurs when an amount of amplitude change of the output control signal is equal to or greater than a preset amplitude change threshold.
11. The noise detection device according to claim 8, wherein the noise detection module determines that the environmental noise is present when a phase change amount of the output control signal is equal to or greater than a preset phase change threshold.
12. The noise detecting device according to claim 11, wherein the preset phase change threshold is an empirical value or a calculated value obtained by performing data statistics or data operation on a previous phase change amount.
13. The noise detecting device according to claim 8, wherein the phase change amount calculating module calculates an absolute value of a difference between the phase of the output control signal and the reference phase as the phase change amount of the output control signal.
14. The noise detection device of claim 13, wherein the reference phase is obtained by: after receiving the output control signal, demodulating the output control signal, and adjusting a phase of a signal for demodulation until the phase of the demodulated output control signal is within a predetermined range, the phase of the demodulated output control signal being taken as a reference phase.
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| CN102147678A (en) * | 2010-02-05 | 2011-08-10 | 三星电子株式会社 | Method and apparatus compensating noise in touch panel |
| CN103765354A (en) * | 2011-08-30 | 2014-04-30 | Nlt科技股份有限公司 | Electronic device, electrostatic capacitance sensor, and touch panel |
| CN103516329A (en) * | 2012-06-29 | 2014-01-15 | 敦泰科技有限公司 | Method, device and system for lowering noise based on capacitor screen touch detection |
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