CN112286381A - Communication control method and active capacitance pen - Google Patents
Communication control method and active capacitance pen Download PDFInfo
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- CN112286381A CN112286381A CN202011599098.9A CN202011599098A CN112286381A CN 112286381 A CN112286381 A CN 112286381A CN 202011599098 A CN202011599098 A CN 202011599098A CN 112286381 A CN112286381 A CN 112286381A
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- 230000006854 communication Effects 0.000 title claims abstract description 163
- 238000004891 communication Methods 0.000 title claims abstract description 159
- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000012790 confirmation Methods 0.000 claims description 8
- 238000001228 spectrum Methods 0.000 claims description 8
- 238000012545 processing Methods 0.000 claims description 6
- 239000003990 capacitor Substances 0.000 description 9
- 230000005540 biological transmission Effects 0.000 description 4
- 230000007480 spreading Effects 0.000 description 4
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
- G06F3/0354—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor with detection of 2D relative movements between the device, or an operating part thereof, and a plane or surface, e.g. 2D mice, trackballs, pens or pucks
- G06F3/03545—Pens or stylus
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
- G06F3/04162—Control or interface arrangements specially adapted for digitisers for exchanging data with external devices, e.g. smart pens, via the digitiser sensing hardware
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/50—Circuits using different frequencies for the two directions of communication
- H04B1/52—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa
- H04B1/525—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa with means for reducing leakage of transmitter signal into the receiver
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Abstract
The invention discloses a communication control method and an active capacitance pen. The method comprises the steps of acquiring an input signal sent by the electronic equipment through the active capacitance pen; judging whether an interference signal exists in the input signal or not; when an interference signal exists in the input signal, obtaining a first communication frequency according to the input signal; and adjusting the first communication frequency to a second communication frequency in a preset communication frequency range, and communicating with the electronic equipment at the second communication frequency. The active capacitive pen is not only used for transmitting signals to the electronic equipment, but also used for carrying out two-way communication with the electronic equipment, the input signals are obtained from the electronic equipment, and the signals are transmitted to the electronic equipment after the communication frequency is adjusted when interference signals exist in the input signals, so that the influence of the interference signals on the electronic equipment for receiving the transmitted signals is avoided, the purpose of ensuring the writing stability when the active capacitive pen is interfered in the communication process with the electronic equipment is achieved, and the anti-interference capability of the active capacitive pen is improved.
Description
Technical Field
The invention relates to the technical field of electronics, in particular to a communication control method and an active capacitance pen.
Background
In recent years, with the spread of electronic devices such as tablets and mobile phones, touch panels used in the electronic devices have been widely used. The operation of the user on the touch screen is no longer limited to the operation with the finger, and the input operation on the touch screen through the active capacitance pen has been accepted by a large number of users.
When a user interacts with a touch screen of the electronic device through the active capacitive pen, the active capacitive pen is a signal emission source, the touch screen receives signals sent by the capacitive pen, corresponding coordinates are calculated according to the signals, and therefore the effect similar to the thickness of an actual pen point is achieved. When electronic equipment such as a tablet is influenced by an interference signal to form same frequency interference, if the active capacitance pen continues to write, the electronic equipment cannot accurately receive the signal transmitted by the active capacitance pen, so that the phenomenon that the active capacitance pen is broken in line or even cannot write occurs, and the anti-interference capability is poor.
The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.
Disclosure of Invention
The invention mainly aims to provide a communication control method and an active capacitance pen, and aims to solve the technical problem that the active capacitance pen in the prior art is poor in anti-jamming capability.
In order to achieve the above object, the present invention provides a communication control method, including the steps of:
acquiring an input signal sent by electronic equipment;
judging whether an interference signal exists in the input signal or not;
when the interference signal exists in the input signal, obtaining a first communication frequency according to the input signal;
and adjusting the first communication frequency to a second communication frequency in a preset communication frequency range, and communicating with the electronic equipment at the second communication frequency.
Preferably, the step of acquiring the input signal sent by the electronic device includes:
when a beacon sent by electronic equipment is received, sending a pairing request instruction to the electronic equipment;
receiving a return instruction of the electronic equipment, and judging whether a confirmation character exists in the return instruction;
and when the confirmation character exists in the return instruction, acquiring an input signal sent by the electronic equipment.
Preferably, the step of determining whether an interference signal exists in the input signal includes:
acquiring the frequency of each signal in the input signal;
judging whether the frequency exceeding the preset communication frequency range exists in the frequencies of the signals or not;
and when the frequency exceeding the preset communication frequency range exists, judging that an interference signal exists in the input signal.
Preferably, the step of communicating with the electronic device at the second communication frequency includes:
communicating with the electronic device at the second communication frequency and based on direct sequence spread spectrum modulation.
Preferably, the method further comprises:
acquiring a signal to be transmitted, and judging whether the intensity of the signal to be transmitted is lower than a preset intensity;
and when the intensity of the signal to be transmitted is lower than the preset intensity, the signal to be transmitted is subjected to enhancement processing, and the enhanced signal to be transmitted is sent to the electronic equipment.
Preferably, the step of performing enhancement processing on the signal to be transmitted includes:
and boosting the voltage of the signal to be transmitted.
The invention also provides an active capacitive pen, which comprises a main chip, wherein the main chip is used for acquiring the input signal sent by the electronic equipment; judging whether an interference signal exists in the input signal or not; when the interference signal exists in the input signal, obtaining a first communication frequency according to the input signal; and adjusting the first communication frequency to a second communication frequency in a preset communication frequency range, and communicating with the electronic equipment at the second communication frequency.
Preferably, the active capacitive pen further comprises an uplink communication module and a downlink communication module; the uplink communication module and the downlink communication module are both connected with the main chip; wherein,
the uplink communication module is used for receiving an input signal sent by the electronic equipment and sending the input signal to the main chip;
the main chip is further configured to send an output signal to the downlink communication module at the second communication frequency;
and the downlink communication module is used for receiving the output signal and sending the output signal to the electronic equipment.
Preferably, the uplink communication module includes a first resistor and a first ESD electrostatic diode; the first end of the first resistor is connected with the first end of the main chip, the second end of the first resistor is grounded through the first ESD electrostatic diode, and the second end of the first resistor is connected with the receiving end of the pen point.
Preferably, the downlink communication module includes a second resistor and a second ESD electrostatic diode; the first end of the second resistor is connected with the second end of the main chip, the second end of the second resistor is grounded through the second ESD electrostatic diode, and the second end of the second resistor is connected with the sending end of the pen point.
The method comprises the steps of acquiring an input signal sent by the electronic equipment through the active capacitance pen; judging whether an interference signal exists in the input signal or not; when an interference signal exists in the input signal, obtaining a first communication frequency according to the input signal; and adjusting the first communication frequency to a second communication frequency in a preset communication frequency range, and communicating with the electronic equipment at the second communication frequency. The active capacitive pen is not only used for transmitting signals to the electronic equipment, but also used for carrying out two-way communication with the electronic equipment, and the active capacitive pen is used for transmitting signals to the electronic equipment by acquiring input signals sent by the electronic equipment and adjusting communication frequency when interference signals exist in the input signals, so that the influence of the interference signals on the electronic equipment for receiving the transmitted signals is avoided, the purpose of still ensuring the writing stability when the active capacitive pen is interfered in the communication process with the electronic equipment is achieved, and the anti-interference capability of the active capacitive pen is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a flow chart illustrating a communication control method according to an embodiment of the present invention;
FIG. 2 is a flowchart illustrating a communication control method according to another embodiment of the present invention;
FIG. 3 is a functional block diagram of an active capacitive stylus according to an embodiment of the present invention;
fig. 4 is an alternative structure diagram of the active capacitance pen of fig. 3.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 100 | Uplink communication module | TXD | Sending end of |
| 200 | Downlink communication module | C1~C2 | First to |
| 300 | Pressure sensor module | R1~R2 | First to second resistors |
| U1 | Main chip | D1 | First ESD electrostatic diode |
| RXD | Receiving end of pen point | D2 | Second ESD electrostatic diode |
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a flowchart illustrating a communication control method according to an embodiment of the present invention.
In one embodiment, the communication control method includes the following steps:
s10: acquiring an input signal sent by electronic equipment;
it can be understood that the main body of the implementation of the present embodiment is an active capacitive pen. The electronic device refers to a device having a touch screen interacting with an active capacitive pen, such as a smart phone and a tablet computer, which is not limited in this embodiment.
It should be noted that, in the prior art, the active capacitive pen only transmits signals to the electronic device at a fixed communication frequency, and when the electronic device is interfered due to charging or environmental factors, the active capacitive pen cannot know whether the electronic device is interfered, and still transmits signals to the electronic device at the fixed communication frequency, but at this time, the electronic device cannot accurately receive the signals transmitted by the active capacitive pen, so that the writing is broken, and even the writing cannot be performed. In the embodiment, the active capacitive pen actively acquires the input signal from the electronic equipment, and the communication frequency is adjusted according to the input signal, so that the adjusted communication frequency transmits a signal to the electronic equipment, and the influence of an interference signal on the electronic equipment is avoided.
In an embodiment, when a plurality of active capacitive pens communicate with an electronic device at the same time, the active capacitive pens and the electronic device need to be paired, and only the successfully paired active capacitive pens can acquire the input signal from the electronic device, so that the accuracy of signal transmission and the efficiency of communication are improved.
Specifically, when the active capacitive pen monitors a beacon sent by the electronic device, a pairing request instruction is sent to the electronic device; receiving a return instruction of the electronic equipment, and judging whether a confirmation character exists in the return instruction; and when the confirmation character exists in the return instruction, acquiring an input signal sent by the electronic equipment.
S20: judging whether an interference signal exists in the input signal or not;
in a specific implementation, when the electronic device is in a low power state, a charging state, or under the influence of an environment (such as a microwave oven), the input signal transmitted by the electronic device to the active capacitive stylus includes both a communication signal and an interference signal.
In one embodiment, since the frequency of the interference signal is usually high, whether the interference signal exists can be determined according to the frequency of each signal in the input signal. Specifically, the frequency of each signal in the input signal is acquired; judging whether the frequency exceeding the preset communication frequency range exists in the frequencies of the signals or not; and when the frequency exceeding the preset communication frequency range exists, judging that an interference signal exists in the input signal.
The preset communication frequency range is a preset communication frequency range in the active capacitance pen, and the preset communication frequency range is preferably 15KHz-40 KHz.
It should be understood that when the frequency of a certain signal in the input signal is not within the preset communication frequency range, the signal may be determined as an interference signal, and then the presence of the interference signal in the input signal may be determined, and when the frequencies of all the signals in the input signal are within the preset communication frequency range, the absence of the interference signal in the input signal may be determined.
S30: when the interference signal exists in the input signal, obtaining a first communication frequency according to the input signal;
it should be noted that the first communication frequency refers to a frequency at which the electronic device sends an input signal to the active capacitance pen, and when an interference signal exists in the input signal, the communication frequency between the electronic device and the active capacitance pen needs to be adjusted, so that the first communication frequency needs to be obtained first.
It should be understood that the communication frequency range of the electronic device during normal operation is usually 1KHz-1MHz, therefore, the first communication frequency may be 1KHz-1MHz, and the interference signal is usually a higher frequency signal, which may be 1MHz, 200KHz or 400KHz, and the like, and is liable to generate co-channel interference to the electronic device.
S40: and adjusting the first communication frequency to a second communication frequency in a preset communication frequency range, and communicating with the electronic equipment at the second communication frequency.
It should be understood that, as described above, the preset communication frequency range is a preset communication frequency range in the active capacitance pen, and the preset communication frequency range is preferably 15KHz to 40 KHz.
In specific implementation, when an interference signal exists in an input signal, the active capacitance pen adjusts the communication frequency to a second communication frequency in the range of 15KHz to 40KHz, and transmits the signal to the electronic equipment at the second communication frequency, so that the frequency of the interference signal can be effectively avoided, and the accuracy of receiving the transmitted signal by the electronic equipment is further ensured.
In one embodiment, the active capacitive stylus communicates with the electronic device based on direct sequence spread spectrum modulation. Specifically, when the active capacitance pen transmits a signal, the active capacitance pen modulates the transmitted signal with a spreading code sequence with a high code rate, so as to spread the frequency spectrum of the signal and obtain a spread signal, and the electronic device despreads the spread signal with the same spreading code sequence as the active capacitance pen, so as to restore the original transmitted signal. The anti-interference capability of the active capacitance pen can be effectively improved by applying direct sequence spread spectrum modulation in the active capacitance pen.
In the embodiment, an input signal sent by the electronic equipment is acquired through the active capacitance pen; judging whether an interference signal exists in the input signal or not; when an interference signal exists in the input signal, obtaining a first communication frequency according to the input signal; and adjusting the first communication frequency to a second communication frequency in a preset communication frequency range, and communicating with the electronic equipment at the second communication frequency. The active capacitive pen is not only used for transmitting signals to the electronic equipment, but also used for carrying out two-way communication with the electronic equipment, and the active capacitive pen is used for transmitting signals to the electronic equipment by acquiring input signals sent by the electronic equipment and adjusting communication frequency when interference signals exist in the input signals, so that the influence of the interference signals on the electronic equipment for receiving the transmitted signals is avoided, the purpose of still ensuring the writing stability when the active capacitive pen is interfered in the communication process with the electronic equipment is achieved, and the anti-interference capability of the active capacitive pen is improved.
Further, as shown in fig. 2, another embodiment of the communication control method according to the present invention is provided based on an embodiment, in which the method further includes the following steps:
s50: acquiring a signal to be transmitted, and judging whether the intensity of the signal to be transmitted is lower than a preset intensity;
it should be understood that the signal to be transmitted refers to a transmission signal to be transmitted to the electronic device by the active capacitive stylus, and the transmission signal is typically a PWM voltage signal. The strength of the signal to be transmitted can be effectively detected by judging whether the strength of the signal to be transmitted is lower than the preset strength.
S60: and when the intensity of the signal to be transmitted is lower than the preset intensity, the signal to be transmitted is subjected to enhancement processing, and the enhanced signal to be transmitted is sent to the electronic equipment.
It should be noted that, in consideration of the fact that when the intensity of the signal to be transmitted is low, the transmitted signal received by the coupling capacitor on the touch screen of the electronic device is weak, and writing fluency is affected, in this embodiment, when the intensity to be transmitted is lower than the preset intensity, the signal to be transmitted is enhanced and then sent to the electronic device.
Considering that the main chip of the active capacitive pen can generally boost the battery voltage and output different voltages, in an embodiment, the signal to be transmitted may be enhanced by boosting the voltage of the signal to be transmitted, such as boosting the voltage of the signal to be transmitted to 16V, 20V, or 23V.
The embodiment comprises the steps of acquiring a signal to be transmitted and judging whether the intensity of the signal to be transmitted is lower than a preset intensity; when the intensity of the signal to be transmitted is lower than the preset intensity, the signal to be transmitted is enhanced, and the enhanced signal to be transmitted is sent to the electronic equipment, so that the intensity of the signal transmitted from the active capacitive pen to the electronic equipment is improved, and the writing fluency of the active capacitive pen is guaranteed.
The invention also provides an active capacitance pen.
Referring to fig. 3, in an embodiment, the active capacitive pen includes a main chip U1, the main chip U1 is configured to obtain an input signal sent by an electronic device (not shown); judging whether an interference signal exists in the input signal or not; when the interference signal exists in the input signal, obtaining a first communication frequency according to the input signal; and adjusting the first communication frequency to a second communication frequency in a preset communication frequency range, and communicating with the electronic equipment at the second communication frequency.
It can be understood that the main body of the implementation of the present embodiment is an active capacitive pen. The electronic device refers to a device having a touch screen interacting with an active capacitive pen, such as a smart phone and a tablet computer, which is not limited in this embodiment.
It should be noted that, in the prior art, the active capacitive pen only transmits signals to the electronic device at a fixed communication frequency, and when the electronic device is interfered due to charging or environmental factors, the active capacitive pen cannot know whether the electronic device is interfered, and still transmits signals to the electronic device at the fixed communication frequency, but at this time, the electronic device cannot accurately receive the signals transmitted by the active capacitive pen, so that the writing is broken, and even the writing cannot be performed. In the embodiment, the active capacitive pen actively acquires the input signal from the electronic equipment, and the communication frequency is adjusted according to the input signal, so that the adjusted communication frequency transmits a signal to the electronic equipment, and the influence of an interference signal on the electronic equipment is avoided.
In an embodiment, when a plurality of active capacitive pens communicate with an electronic device at the same time, the active capacitive pens and the electronic device need to be paired, and only the successfully paired active capacitive pens can acquire the input signal from the electronic device, so that the accuracy of signal transmission and the efficiency of communication are improved.
Specifically, when the active capacitive pen monitors a beacon sent by the electronic device, a pairing request instruction is sent to the electronic device; receiving a return instruction of the electronic equipment, and judging whether a confirmation character exists in the return instruction; and when the confirmation character exists in the return instruction, acquiring an input signal sent by the electronic equipment.
In a specific implementation, when the electronic device is in a low power state, a charging state, or under the influence of an environment (such as a microwave oven), the input signal transmitted by the electronic device to the active capacitive stylus includes both a communication signal and an interference signal.
In one embodiment, since the frequency of the interference signal is usually high, whether the interference signal exists can be determined according to the frequency of each signal in the input signal. Specifically, the frequency of each signal in the input signal is acquired; judging whether the frequency exceeding the preset communication frequency range exists in the frequencies of the signals or not; and when the frequency exceeding the preset communication frequency range exists, judging that an interference signal exists in the input signal.
The preset communication frequency range is a preset communication frequency range in the active capacitance pen, and the preset communication frequency range is preferably 15KHz-40 KHz.
It should be understood that when the frequency of a certain signal in the input signal is not within the preset communication frequency range, the signal may be determined as an interference signal, and then the presence of the interference signal in the input signal may be determined, and when the frequencies of all the signals in the input signal are within the preset communication frequency range, the absence of the interference signal in the input signal may be determined.
It should be noted that the first communication frequency refers to a frequency at which the electronic device sends an input signal to the active capacitance pen, and when an interference signal exists in the input signal, the communication frequency between the electronic device and the active capacitance pen needs to be adjusted, so that the first communication frequency needs to be obtained first.
It should be understood that the communication frequency range of the electronic device during normal operation is usually 1KHz-1MHz, therefore, the first communication frequency may be 1KHz-1MHz, and the interference signal is usually a higher frequency signal, which may be 1MHz, 200KHz or 400KHz, and the like, and is liable to generate co-channel interference to the electronic device.
It should be understood that, as described above, the preset communication frequency range is a preset communication frequency range in the active capacitance pen, and the preset communication frequency range is preferably 15KHz to 40 KHz.
In specific implementation, when an interference signal exists in an input signal, the active capacitance pen adjusts the communication frequency to a second communication frequency in the range of 15KHz to 40KHz, and transmits the signal to the electronic equipment at the second communication frequency, so that the frequency of the interference signal can be effectively avoided, and the accuracy of receiving the transmitted signal by the electronic equipment is further ensured.
In one embodiment, the active capacitive stylus communicates with the electronic device based on direct sequence spread spectrum modulation. Specifically, when the active capacitance pen transmits a signal, the active capacitance pen modulates the transmitted signal with a spreading code sequence with a high code rate, so as to spread the frequency spectrum of the signal and obtain a spread signal, and the electronic device despreads the spread signal with the same spreading code sequence as the active capacitance pen, so as to restore the original transmitted signal. The anti-interference capability of the active capacitance pen can be effectively improved by applying direct sequence spread spectrum modulation in the active capacitance pen.
Further, the main chip U1 is further configured to acquire a signal to be transmitted, and determine whether the strength of the signal to be transmitted is lower than a preset strength; and when the intensity of the signal to be transmitted is lower than the preset intensity, the signal to be transmitted is subjected to enhancement processing, and the enhanced signal to be transmitted is sent to the electronic equipment.
It should be understood that the signal to be transmitted refers to a transmission signal to be transmitted to the electronic device by the active capacitive stylus, and the transmission signal is typically a PWM voltage signal. The strength of the signal to be transmitted can be effectively detected by judging whether the strength of the signal to be transmitted is lower than the preset strength.
It should be noted that, in consideration of the fact that when the intensity of the signal to be transmitted is low, the transmitted signal received by the coupling capacitor on the touch screen of the electronic device is weak, and writing fluency is affected, in this embodiment, when the intensity to be transmitted is lower than the preset intensity, the signal to be transmitted is enhanced and then sent to the electronic device.
Considering that the main chip U1 of the active capacitive pen can generally boost the battery voltage and output different voltages, in an embodiment, the signal to be transmitted can be enhanced by boosting the voltage of the signal to be transmitted, such as boosting the voltage of the signal to be transmitted to 16V, 20V or 23V.
Further, the main chip U1 is further configured to obtain a power supply voltage, boost the power supply voltage, and output the boosted voltage to an electronic device.
In one embodiment, the power supply voltage may be a voltage provided by a battery, such as a 1.5V voltage, and a DC-DC boost circuit may be integrated inside the main chip U1 to boost the 1.5V voltage to 1.8V to supply power to the main chip U1. Of course, the DC-DC boosting circuit can also boost the voltage of 1.5V to the voltage of 16V, 20V or 23V so as to enhance the transmitting signal and ensure the writing fluency when the transmitting signal is weaker.
Further, the active capacitive pen further includes an uplink communication module 100 and a downlink communication module 200; the uplink communication module 100 and the downlink communication module 200 are both connected to the main chip U1; the uplink communication module 100 is configured to receive an input signal sent by the electronic device, and send the input signal to the main chip U1; the master chip U1 is further configured to send an output signal to the downlink communication module 200 at the second communication frequency; the downlink communication module 200 is configured to receive the output signal and send the output signal to the electronic device.
In one embodiment, the uplink communication module 100 includes a first resistor R1 and a first ESD diode D1; the first end of the first resistor R1 is connected with the first end of the main chip U1, the second end of the first resistor R1 is grounded through the first ESD electrostatic diode D1, and the second end of the first resistor R1 is connected with the receiving end RXD of the pen point.
It should be appreciated that the first resistor R1 is used to impedance match the input signal to reduce noise of the input signal; the first ESD diode D1 is used for electrostatic protection of the main chip U1. The receiving end RXD of the pen point generally refers to an antenna, which may be a spring, through which the active capacitive pen may receive an input signal.
In another embodiment, the downlink communication module 200 includes a second resistor R2 and a second ESD diode D2; the first end of the second resistor R2 is connected to the second end of the main chip U1, the second end of the second resistor R2 is grounded via the second ESD diode D2, and the second end of the second resistor R2 is connected to the transmitting end TXD of the pen point.
It should be appreciated that the second resistor R2 is used to impedance match the transmit signal to reduce the noise of the transmit signal; the second ESD 2 is used for electrostatic protection of the main chip U1. The transmitting end TXD of the pen point generally refers to an antenna, and the antenna can be specifically a spring, and the active capacitance pen can transmit signals to the electronic device through the spring.
Further, the active capacitance pen further comprises a pressure sensor module 300, wherein the pressure sensor module 300 is connected with the main chip U1, and is used for acquiring pressure input from the outside, converting the pressure into a voltage signal, and sending the voltage signal to the main chip U1, so that the main chip U1 determines the thickness effect of the pen tip according to the voltage signal.
In an embodiment, the pressure sensing module includes a first capacitor C1 and a second capacitor C2, a first end of the first capacitor C1 is configured to receive the pressure of the external input, a first end of the first capacitor C1 is further grounded via the second capacitor C2, and a second end of the first capacitor C1 is connected to the main chip U1.
In this embodiment, the active capacitive pen and the electronic device are in bidirectional communication through the specific design of the main chip, the uplink communication module and the downlink communication module in the active capacitive pen. The main chip transmits signals to the electronic equipment after acquiring input signals sent by the electronic equipment and adjusting communication frequency when interference signals exist in the input signals, so that the influence of the interference signals on the electronic equipment for receiving the transmitted signals is avoided, the purpose of still ensuring the writing stability when the active capacitive pen is interfered in the communication process with the electronic equipment is achieved, and the anti-interference capability of the active capacitive pen is improved.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A communication control method is applied to an active capacitance pen, and is characterized by comprising the following steps:
acquiring an input signal sent by electronic equipment;
judging whether an interference signal exists in the input signal or not;
when the interference signal exists in the input signal, obtaining a first communication frequency according to the input signal;
and adjusting the first communication frequency to a second communication frequency in a preset communication frequency range, and communicating with the electronic equipment at the second communication frequency.
2. The communication control method according to claim 1, wherein the step of acquiring the input signal transmitted by the electronic device comprises:
when a beacon sent by electronic equipment is received, sending a pairing request instruction to the electronic equipment;
receiving a return instruction of the electronic equipment, and judging whether a confirmation character exists in the return instruction;
and when the confirmation character exists in the return instruction, acquiring an input signal sent by the electronic equipment.
3. The communication control method of claim 2, wherein the step of determining whether the input signal has an interference signal comprises:
acquiring the frequency of each signal in the input signal;
judging whether the frequency exceeding the preset communication frequency range exists in the frequencies of the signals or not;
and when the frequency exceeding the preset communication frequency range exists, judging that an interference signal exists in the input signal.
4. The communication control method according to claim 3, wherein the step of communicating with the electronic device at the second communication frequency comprises:
communicating with the electronic device at the second communication frequency and based on direct sequence spread spectrum modulation.
5. The communication control method according to any one of claims 1 to 4, wherein the method further comprises:
acquiring a signal to be transmitted, and judging whether the intensity of the signal to be transmitted is lower than a preset intensity;
and when the intensity of the signal to be transmitted is lower than the preset intensity, the signal to be transmitted is subjected to enhancement processing, and the enhanced signal to be transmitted is sent to the electronic equipment.
6. The communication control method according to claim 5, wherein the step of performing the enhancement processing on the signal to be transmitted includes:
and boosting the voltage of the signal to be transmitted.
7. An active capacitive pen is characterized by comprising a main chip, wherein the main chip is used for acquiring an input signal sent by electronic equipment; judging whether an interference signal exists in the input signal or not; when the interference signal exists in the input signal, obtaining a first communication frequency according to the input signal; and adjusting the first communication frequency to a second communication frequency in a preset communication frequency range, and communicating with the electronic equipment at the second communication frequency.
8. The active capacitive pen of claim 7, further comprising an uplink communication module and a downlink communication module; the uplink communication module and the downlink communication module are both connected with the main chip; wherein,
the uplink communication module is used for receiving an input signal sent by the electronic equipment and sending the input signal to the main chip;
the main chip is further configured to send an output signal to the downlink communication module at the second communication frequency;
and the downlink communication module is used for receiving the output signal and sending the output signal to the electronic equipment.
9. The active capacitive pen of claim 8, wherein the uplink communication module comprises a first resistor and a first ESD diode; the first end of the first resistor is connected with the first end of the main chip, the second end of the first resistor is grounded through the first ESD electrostatic diode, and the second end of the first resistor is connected with the receiving end of the pen point.
10. The active capacitive pen of claim 9, wherein the downlink communication module comprises a second resistor and a second ESD diode; the first end of the second resistor is connected with the second end of the main chip, the second end of the second resistor is grounded through the second ESD electrostatic diode, and the second end of the second resistor is connected with the sending end of the pen point.
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