CN107908299B - Electromagnetic signal processing method, device and system - Google Patents
Electromagnetic signal processing method, device and system Download PDFInfo
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- CN107908299B CN107908299B CN201711139562.4A CN201711139562A CN107908299B CN 107908299 B CN107908299 B CN 107908299B CN 201711139562 A CN201711139562 A CN 201711139562A CN 107908299 B CN107908299 B CN 107908299B
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- 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
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Abstract
The invention discloses a method, a device and a system for processing an electromagnetic signal, wherein the processing process of a target electromagnetic signal comprises N processing time periods, N is an integer greater than 1, and the method comprises the following steps: performing integration processing on a target electromagnetic signal and an auxiliary signal according to a first cycle of the auxiliary signal between a first processing time interval and an N-1 processing time interval to obtain an amplitude value of the target electromagnetic signal; selecting a signal channel corresponding to the maximum amplitude value as a detection channel of the phase value; in the Nth processing time period, according to the second period of the auxiliary signal, performing integration processing on the target electromagnetic signal and the auxiliary signal to obtain a phase value of the target electromagnetic signal; and analyzing the amplitude value and the phase value according to the association relationship between the preset amplitude value and the preset phase value to obtain the phase change value of the target electromagnetic signal. By adopting the technical scheme of the invention, the detection precision of the electromagnetic pen can be improved.
Description
Technical Field
The invention relates to the technical field of electromagnetic touch control, in particular to a method, a device and a system for processing electromagnetic signals.
Background
At present, man-machine interaction equipment based on an electromagnetic induction technology is widely applied, the equipment needs to be matched with an electromagnetic touch pen (electromagnetic pen for short) and an electromagnetic touch panel (electromagnetic panel for short) to work, the electromagnetic pen and the electromagnetic panel jointly form an electromagnetic assembly, and the detection precision is high.
In the prior art, after an electromagnetic signal is shunted, a phase angle change and an amplitude value of the electromagnetic signal are respectively detected to determine a pressure value of an electromagnetic pen and an actual position of the electromagnetic pen.
However, since the received electromagnetic signal is relatively weak in strength and is easily affected by noise, shunting the electromagnetic signal has the following problems:
1. further attenuating the SIGNAL strength with a loss in SIGNAL-to-NOISE RATIO (SNR).
2. Crosstalk is easily experienced between the branches.
3. Since the drive capability of the pre-stage operational amplifier is limited, the electromagnetic signal is greatly affected by the auxiliary detection signal, and a large overshoot noise is easily generated.
Therefore, when the electromagnetic pen is positioned in the prior art, the detection precision of the electromagnetic pen is reduced.
Disclosure of Invention
The invention aims to provide a method, a device and a system for processing an electromagnetic signal, which can improve the detection precision of an electromagnetic pen.
In order to achieve the above object, the present invention provides a method for processing an electromagnetic signal, wherein a processing procedure of a target electromagnetic signal includes N processing periods, where N is an integer greater than 1, and the method includes:
performing integration processing on a target electromagnetic signal and an auxiliary signal according to a first cycle of the auxiliary signal between a first processing time interval and an N-1 processing time interval to obtain an amplitude value of the target electromagnetic signal;
selecting a signal channel corresponding to the maximum amplitude value as a detection channel of the phase value;
in the Nth processing time period, according to the second period of the auxiliary signal, performing integration processing on the target electromagnetic signal and the auxiliary signal to obtain a phase value of the target electromagnetic signal;
analyzing the amplitude value and the phase value according to the association relationship between a preset amplitude value and the phase value to obtain a phase change value of the target electromagnetic signal;
wherein the first period is different from the second period.
Further, in the above method, before performing integration processing on the target electromagnetic signal and the auxiliary signal according to the second period of the auxiliary signal to obtain the phase value of the target electromagnetic signal, the method further includes:
acquiring the period of the target electromagnetic signal;
and setting the second period according to the period of the target electromagnetic signal.
Further, in the method, setting the second period according to the period of the target electromagnetic signal includes:
and setting the second period as a period which has a phase difference of pi from the target electromagnetic signal and is the same as the period of the target electromagnetic signal.
Further, before the integrating the target electromagnetic signal and the auxiliary signal according to the first cycle of the auxiliary signal between the first processing period and the N-1 th processing period to obtain the amplitude value of the target electromagnetic signal, the method further includes:
the first period is set according to a time interval of the transmitted electromagnetic signal and the received electromagnetic signal.
Further, before the integrating the target electromagnetic signal and the auxiliary signal according to the first cycle of the auxiliary signal between the first processing period and the N-1 th processing period to obtain the amplitude value of the target electromagnetic signal, the method further includes:
filtering the received electromagnetic signal to obtain a filtered electromagnetic signal;
and rectifying the filtered electromagnetic signal to obtain a rectified electromagnetic signal which is used as the target electromagnetic signal.
The invention also provides a processing device of the electromagnetic signal, wherein the processing process of the target electromagnetic signal comprises N processing time periods, N is an integer greater than 1, and the device comprises a phase amplitude detection module and a processor;
the phase amplitude detection module is used for performing integration processing on a target electromagnetic signal and an auxiliary signal according to a first cycle of the auxiliary signal between a first processing time interval and an N-1 processing time interval to obtain an amplitude value of the target electromagnetic signal; selecting a signal channel corresponding to the maximum amplitude value as a detection channel of the phase value; in the Nth processing time period, according to the second period of the auxiliary signal, performing integration processing on the target electromagnetic signal and the auxiliary signal to obtain a phase value of the target electromagnetic signal;
the processor is used for analyzing the amplitude value and the phase value according to the association relationship between the preset amplitude value and the preset phase value to obtain a phase change value of the target electromagnetic signal;
wherein the first period is different from the second period.
Further, in the above apparatus, the processor is further configured to obtain a period of the target electromagnetic signal, and set the second period according to the period of the target electromagnetic signal.
Further, in the above device, the processor is further configured to set the first period according to a time interval between the transmitted electromagnetic signal and the received electromagnetic signal.
Further, the above apparatus further includes:
the filter is used for filtering the received electromagnetic signals to obtain filtered electromagnetic signals;
and the rectifier is used for rectifying the filtered electromagnetic signal to obtain a rectified electromagnetic signal which is used as the target electromagnetic signal.
The invention also provides a processing system of the electromagnetic signal, which comprises the electromagnetic pen and the processing device of the electromagnetic signal;
the processing device of the electromagnetic signal is provided with an antenna array;
and signal interaction is carried out between the electromagnetic pen and the antenna array.
According to the method, the device and the system for processing the electromagnetic signal, disclosed by the invention, by utilizing a time-sharing principle, the target electromagnetic signal and the auxiliary signal are subjected to integration processing according to the first period of the auxiliary signal between the first processing time interval and the N-1 processing time interval to obtain the amplitude value of the target electromagnetic signal, the target electromagnetic signal and the auxiliary signal are subjected to integration processing according to the second period of the auxiliary signal in the N processing time interval to obtain the phase value of the target electromagnetic signal, and the amplitude value and the phase value are analyzed according to the association relation between the preset amplitude value and the phase value to obtain the phase change value of the target electromagnetic signal, so that the phase value and the amplitude value of the target electromagnetic signal can be detected under the condition that the target electromagnetic signal is not subjected to shunting processing, and the pressure and the position of an electromagnetic pen can be determined. By adopting the technical scheme of the invention, the detection precision of the electromagnetic pen can be improved.
Drawings
Fig. 1 is a flowchart of a first embodiment of a method for processing an electromagnetic signal according to the present invention.
Fig. 2 is a flowchart of a second embodiment of the method for processing electromagnetic signals according to the present invention.
FIG. 3 is a timing diagram of electromagnetic signals in the present invention.
Fig. 4 is a circuit diagram of a rectifying and amplifying circuit according to the present invention.
Fig. 5 is a circuit diagram of phase/amplitude detection according to the present invention.
Fig. 6 is a schematic diagram of the verification result obtained by applying the electromagnetic signal processing method of the present invention.
Fig. 7 is a schematic structural diagram of a first embodiment of an apparatus for processing electromagnetic signals according to the present invention.
Fig. 8 is a schematic structural diagram of a second embodiment of an apparatus for processing electromagnetic signals according to the present invention.
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 specific embodiments of the present invention and corresponding drawings. It is to be understood that the described embodiments are only some, and not all, embodiments of the invention. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments of the present invention without any creative efforts shall fall within the protection scope of the embodiments of the present invention.
The terms first, second and the like in the description and in the claims, and in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be practiced otherwise than as specifically illustrated.
The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Example 1
Fig. 1 is a flowchart of a first embodiment of a method for processing an electromagnetic signal, as shown in fig. 1, the method for processing an electromagnetic signal of this embodiment may specifically include the following steps:
100. and between the first processing time interval and the N-1 processing time interval, carrying out integration processing on the target electromagnetic signal and the auxiliary signal according to the first cycle of the auxiliary signal to obtain the amplitude value of the target electromagnetic signal.
In a specific implementation process, when the processing method of the electromagnetic signal of this embodiment is used to process the target electromagnetic signal, the processing process may include N processing time periods, and the target electromagnetic signal may be processed according to the cycle of the auxiliary signal in a set time period by using a time-sharing principle, so as to detect the amplitude value and the phase value of the target electromagnetic signal. Wherein N is an integer greater than 1.
Specifically, during amplitude detection, the target electromagnetic signal and the auxiliary signal may be integrated according to the first cycle of the auxiliary signal between the first processing period and the N-1 th processing period to obtain an amplitude value of the target electromagnetic signal, so as to determine the actual position of the electromagnetic pen.
101. And selecting a signal channel corresponding to the maximum amplitude value as a detection channel of the phase value.
After the channels near the electromagnetic pen are detected, the signal channel corresponding to the maximum amplitude value can be selected as the detection channel of the phase value.
For example, the adjacent channels of the electromagnetic pen include 3 channels X1, X2 and X3 in the X direction, and 3 channels Y1, Y2 and Y3 in the Y direction, and if it is determined that the amplitude value in the X1 direction is the largest, the channel in the X1 direction may be selected as the detection channel of the phase value.
102. And in the Nth processing time interval, according to the second cycle of the auxiliary signal, carrying out integration processing on the target electromagnetic signal and the auxiliary signal to obtain a phase value of the target electromagnetic signal.
In the phase detection, after determining the detection channel of the phase value, the phase value of the target electromagnetic signal may be detected in the last processing period. In the nth processing period, the target electromagnetic signal and the auxiliary signal are integrated according to the second cycle of the auxiliary signal, so as to obtain the phase value of the target electromagnetic signal. Wherein the first period is different from the second period.
In the method for processing the electromagnetic signal of the embodiment, because the target electromagnetic signal is not subjected to shunt processing during amplitude detection and phase detection, the signal strength is relatively strong, the SNR loss is less, the influence of the auxiliary signal is less, and large overshoot noise is not easy to occur.
103. And analyzing the amplitude value and the phase value according to the association relationship between the preset amplitude value and the preset phase value to obtain the phase change value of the target electromagnetic signal.
In this embodiment, an association relationship between the amplitude value and the phase value may be preset, for example, the association relationship between the amplitude value and the phase value may be, but is not limited to, a functional relationship between the amplitude value and the phase value, and the amplitude value and the phase value are analyzed by using the functional relationship between the amplitude value and the phase value to obtain a phase change value of the target electromagnetic signal, so as to determine the pressure value of the electromagnetic pen.
In the method for processing an electromagnetic signal of this embodiment, since the time interval between the amplitude detection and the phase detection is short, the influence on the detection result is small, and thus the obtained detection result is relatively accurate.
The execution subject of the electromagnetic signal processing method according to the embodiment of the present invention may be an electromagnetic signal processing apparatus, and the electromagnetic signal processing apparatus may be specifically integrated by software and/or hardware, which is not particularly limited in the present invention.
In the electromagnetic signal processing method of this embodiment, by using a time-sharing principle, between a first processing time period and an N-1 th processing time period, according to a first cycle of an auxiliary signal, an integration process is performed on a target electromagnetic signal and the auxiliary signal to obtain an amplitude value of the target electromagnetic signal, and in the nth processing time period, according to a second cycle of the auxiliary signal, the integration process is performed on the target electromagnetic signal and the auxiliary signal to obtain a phase value of the target electromagnetic signal, and according to a preset association relationship between the amplitude value and the phase value, the amplitude value and the phase value are analyzed to obtain a phase change value of the target electromagnetic signal, so that the phase value and the amplitude value of the target electromagnetic signal can be detected without performing a shunting process on the target electromagnetic signal to determine the pressure and the position of an electromagnetic pen. By adopting the technical scheme of the invention, the detection precision of the electromagnetic pen can be improved.
Example 2
Fig. 2 is a flowchart of a second embodiment of the method for processing an electromagnetic signal according to the present invention, and as shown in fig. 2, the method for processing an electromagnetic signal according to the present embodiment further describes the technical solution of the present invention in more detail based on the embodiment shown in fig. 1.
As shown in fig. 2, the method for processing an electromagnetic signal of this embodiment may specifically include the following steps:
200. an electromagnetic signal is transmitted to the electromagnetic pen.
201. And receiving an electromagnetic signal transmitted by the electromagnetic pen.
In a specific implementation process, the electromagnetic signal may be transmitted to the electromagnetic pen and received through the antenna array according to a preset time interval for signal transceiving, for example, the electromagnetic signal may be transmitted to the electromagnetic pen through the antenna array at a certain time, and after receiving the electromagnetic signal, the electromagnetic pen may generate resonance, and generate an electromagnetic signal in the electromagnetic pen, and when the preset time interval is reached, the electromagnetic signal transmitted by the electromagnetic pen may be received through the antenna array.
202. And filtering the received electromagnetic signal to obtain a filtered electromagnetic signal.
For example, after receiving the electromagnetic signal transmitted by the electromagnetic pen, the received electromagnetic signal may be filtered by a filter amplifier, so as to obtain a filtered electromagnetic signal.
203. And rectifying the filtered electromagnetic signal to obtain a rectified electromagnetic signal serving as a target electromagnetic signal.
For example, the rectified electromagnetic signal may be obtained by rectifying and amplifying the filtered electromagnetic signal by a rectifier amplifier, and is used as the target electromagnetic signal.
204. The first period is set according to a time interval of the transmitted electromagnetic signal and the received electromagnetic signal.
For example, in this embodiment, the first auxiliary signal period may be set according to the time interval between the transmitted electromagnetic signal and the received electromagnetic signal, so that the first auxiliary signal period coincides with the time interval between the transmission of the electromagnetic signal and the reception of the electromagnetic signal by the antenna array.
It should be noted that there is no precedence relationship between steps 202 to 203 and 204.
205. And between the first processing time interval and the N-1 processing time interval, carrying out integration processing on the target electromagnetic signal and the auxiliary signal according to the first cycle of the auxiliary signal to obtain the amplitude value of the target electromagnetic signal.
206. And selecting a signal channel corresponding to the maximum amplitude value as a detection channel of the phase value.
207. In the Nth processing period, the cycle of the target electromagnetic signal is acquired.
208. The second period is set according to the period of the target electromagnetic signal.
In the nth processing period, if the detection channel of the phase value is determined, the period of the target electromagnetic signal may be obtained, so as to set the second period of the auxiliary signal according to the period of the target electromagnetic signal.
For example, the second period of the assist signal may be set to a period that is different from the phase of the target electromagnetic signal by pi and is the same as the period of the target electromagnetic signal.
It should be noted that, in this embodiment, the phase difference between the auxiliary signal and the target electromagnetic signal may be set according to actual requirements.
209. And according to the second period of the auxiliary signal, integrating the target electromagnetic signal and the auxiliary signal to obtain a phase value of the target electromagnetic signal.
210. And analyzing the amplitude value and the phase value according to the association relationship between the preset amplitude value and the preset phase value to obtain the phase change value of the target electromagnetic signal.
For example, the correlation between the amplitude value and the phase value in this embodiment may be the following functional relation:
θ＝f(Vphase/Vamplitude) (1)
wherein, θ is the phase change value of the target electromagnetic signal, Vphase is the phase value, and Vamplitude is the amplitude value.
Taking the maximum amplitude value as the X-direction channel as an example, a calculation formula corresponding to the ratio relationship between the phase value and the amplitude value may be set according to actual requirements, and the following calculation formula may be used as an example in this embodiment to explain the technical solution of the present invention:
the phase change value of the target electromagnetic signal can be obtained through the formulas (2) and (3), and then the pressure value of the electromagnetic pen is determined.
It should be noted that, in the above formulas (2) and (3), when the electromagnetic pen is not pressed, the auxiliary signal and the electromagnetic signal have the same phase; or after the electromagnetic pen is pressed, the inductance value is reduced or the capacitance value is reduced (so that the resonant frequency is slightly larger and the phase is shifted), if the auxiliary signal initially differs from the electromagnetic signal by pi, or the inductance value or the capacitance value is increased after the electromagnetic pen is pressed, different calculation formulas can be established for analysis, and then the change of the phase angle is determined, which is not illustrated one by one here.
According to the electromagnetic signal processing method, as the target electromagnetic signal is not subjected to shunting processing, the phase detection and the amplitude detection can be completed by the same components, so that the number of the components is reduced, the structure is simple, and the cost is low.
The technical solution of the present invention is described below with specific examples.
Fig. 3 is a timing diagram of the electromagnetic signals in the present invention, as shown in fig. 3, at time T0, the processor may control the multiplexing switch to select the channel where the electromagnetic pen is located, and transmit the electromagnetic signal S0 to the electromagnetic pen through the antenna array, and after receiving the electromagnetic signal S0, the electromagnetic pen may generate resonance to generate the electromagnetic signal. At the time T1, the antenna array stops transmitting the electromagnetic signal S0, converts the electromagnetic signal into a received electromagnetic signal, performs filtering and amplification by the filter amplifier to obtain a filtered electromagnetic signal S1, and performs rectification and amplification on the electromagnetic signal S1 by the rectifier amplifier to obtain a rectified electromagnetic signal S2. The processor is preferably a Microcontroller Unit (MCU).
Fig. 4 is a circuit diagram of a rectification amplifying circuit of the present invention, which can be implemented by a precise half-wave rectification circuit. As shown in fig. 4, the electromagnetic signal S1 of the present embodiment is rectified and amplified by a precision half-wave rectifier circuit formed by a resistor R1, a resistor R2, a diode D1, a diode D2 and an operational amplifier OP1, and then the electromagnetic signal S2 is outputted, and the electromagnetic signal S2 is inputted into the phase/amplitude detection circuit as a target electromagnetic signal.
Fig. 5 is a circuit diagram of the phase/amplitude detection circuit of the present invention, and as shown in fig. 5, the circuit diagram of the phase/amplitude detection circuit of the present embodiment is formed by a control chip U, a resistor R3, a resistor R4, a resistor R5, a capacitor C, an operational amplifier OP2, and an operational amplifier OP 3. After the electromagnetic signal S2 is obtained, the auxiliary signal S3 is input, and the electromagnetic signal S2 and the auxiliary signal S3 are integrated by the circuit diagram shown in fig. 5 with the aid of the integration control signal S4, so that an integrated electromagnetic signal S5 is obtained.
For example, the control chip of the type 74LVC2G66 may be selected in this embodiment, and has a two-way analog switch for controlling the electromagnetic signal S2 and the auxiliary signal S3 to perform a logical and operation to complete integration and obtain a corresponding amplitude value or phase value. The operational amplifier OP2 is used to invert the signal from the analog switch for inverse integration by the operational amplifier OP3, and the signal S4 is used to control the on and off of the inverse integration.
As shown in fig. 3, at the time of amplitude detection, a first cycle of the auxiliary signal S3 is set according to the time interval of the transmitted electromagnetic signal and the received electromagnetic signal, for example, in the period T1 to T2, the period T3 to T4 … … Tn-3 to Tn-2, the auxiliary signal S3 is set to a high level, the period T2 to T3, the period T4 to T5, the period … … Tn-2 to Tn-1, the auxiliary signal S3 is set to a low level, the electromagnetic signal S2 and the auxiliary signal S3 are subjected to integration processing, and the corresponding electromagnetic signal S5 is obtained as a signal of the amplitude value. In the phase detection, the second cycle of the auxiliary signal S3 may be set to be pi different from the phase of the target electromagnetic signal and the same as the cycle of the target electromagnetic signal, and the electromagnetic signal S2 and the auxiliary signal S3 may be integrated in the Tn-1 to Tn periods to obtain the corresponding electromagnetic signal S5 as the phase value signal. The processor performs analog-to-digital conversion on the signals of the amplitude values and the signals of the phase values by using the formulas (2) and (3) to obtain a phase change value of the electromagnetic signal S2, and further determines the pressure value of the electromagnetic pen.
Fig. 6 is a schematic diagram of the verification result obtained by applying the electromagnetic signal processing method of the present invention. As shown in fig. 6, the electromagnetic signal S2 'is a waveform when the electromagnetic pen is not pressed, and the electromagnetic signal S2 ″ is a waveform when the electromagnetic pen is pressed, and the phase of the resonant wave changes due to the change in the variable capacitance or variable inductance value of the electromagnetic pen after the pressing, which is seen as a phase shift compared to the electromagnetic signal S2'. The auxiliary signal S3 and the electromagnetic signal S2' are integrated to obtain an integrated electromagnetic signal S5', and the auxiliary signal S3 and the electromagnetic signal S2 "are integrated to obtain an integrated electromagnetic signal S5", and it can be seen that S5' is always close to an integrated waveform of 0, and S5 "is an upward integrated waveform due to the occurrence of a phase shift.
Example 3
Fig. 7 is a schematic structural diagram of a first embodiment of an apparatus for processing an electromagnetic signal according to the present invention, as shown in fig. 7, the apparatus of this embodiment may include a phase amplitude detection module 10 and a processor 11, and the phase amplitude detection module 10 is electrically connected to the processor 11.
In a specific implementation process, when processing the target electromagnetic signal, the processing process may include N processing time periods, and the target electromagnetic signal is processed according to the cycle of the auxiliary signal in a set time period by using a time-sharing principle, so as to detect the amplitude value and the phase value of the target electromagnetic signal. Wherein N is an integer greater than 1.
Specifically, the phase amplitude detection module 10 is configured to perform integration processing on the target electromagnetic signal and the auxiliary signal according to a first cycle of the auxiliary signal between a first processing time period and an N-1 th processing time period to obtain an amplitude value of the target electromagnetic signal; selecting a signal channel corresponding to the maximum amplitude value as a detection channel of the phase value; in the Nth processing time period, according to the second cycle of the auxiliary signal, performing integration processing on the target electromagnetic signal and the auxiliary signal to obtain a phase value of the target electromagnetic signal;
the processor 11 is configured to analyze the amplitude value and the phase value according to a correlation between a preset amplitude value and a preset phase value, so as to obtain a phase change value of the target electromagnetic signal; wherein the first period is different from the second period.
The implementation mechanism of the electromagnetic signal processing apparatus of this embodiment for implementing the detection of the phase change value of the target electromagnetic signal by using the above structure is the same as the implementation mechanism of the embodiment shown in fig. 1, and reference may be made to the description of the embodiment shown in fig. 1 for details, which is not repeated herein.
By adopting the above structure and utilizing the time-sharing principle, the processing device for electromagnetic signals of this embodiment performs integration processing on the target electromagnetic signal and the auxiliary signal according to the first cycle of the auxiliary signal between the first processing period and the N-1 processing period to obtain the amplitude value of the target electromagnetic signal, and performs integration processing on the target electromagnetic signal and the auxiliary signal according to the second cycle of the auxiliary signal within the N processing period to obtain the phase value of the target electromagnetic signal, and analyzes the amplitude value and the phase value according to the association relationship between the preset amplitude value and the phase value to obtain the phase change value of the target electromagnetic signal, so that the phase value and the amplitude value of the target electromagnetic signal can be detected without performing shunt processing on the target electromagnetic signal, so as to determine the pressure and the position of the electromagnetic pen. By adopting the technical scheme of the invention, the detection precision of the electromagnetic pen can be improved.
Example 4
Fig. 8 is a schematic structural diagram of a second embodiment of the apparatus for processing an electromagnetic signal according to the present invention, as shown in fig. 7, the apparatus of this embodiment may further include an antenna array 12, a filter 13, and a rectifier 14, which are electrically connected in sequence, on the basis of the embodiment shown in fig. 7, where the rectifier 14 is electrically connected to the phase amplitude detection module 10.
The antenna array 12 is used for transmitting an electromagnetic signal to the electromagnetic pen, or receiving an electromagnetic signal transmitted by the electromagnetic pen;
the filter 13 is configured to perform filtering processing on the received electromagnetic signal to obtain a filtered electromagnetic signal;
and the rectifier 14 is configured to perform rectification processing on the filtered electromagnetic signal to obtain a rectified electromagnetic signal, which is used as a target electromagnetic signal.
The processor 11 is further configured to set a first period according to the time interval between the transmitted electromagnetic signal and the received electromagnetic signal, and to obtain a period of the target electromagnetic signal and set a second period according to the period of the target electromagnetic signal. For example, the second period may be set to a period that is different in phase from the target electromagnetic signal by pi and is the same as the period of the target electromagnetic signal.
The implementation mechanism of the electromagnetic signal processing apparatus of this embodiment for implementing the detection of the phase change value of the target electromagnetic signal by using the above structure is the same as the implementation mechanism of the embodiment shown in fig. 2, and reference may be made to the description of the embodiment shown in fig. 2 for details, which is not repeated herein.
The invention also provides a processing system of electromagnetic signals, which can comprise an electromagnetic pen and the processing device of electromagnetic signals described in figure 7 or figure 8;
the processing device of the electromagnetic signals is provided with an antenna array, and signal interaction is carried out between the electromagnetic pen and the antenna array.
The implementation mechanism for implementing the detection of the phase change value of the target electromagnetic signal by using the above structure in the electromagnetic signal processing system of this embodiment is the same as the implementation mechanism in the embodiment shown in fig. 1 or fig. 2, and reference may be made to the description of the embodiment shown in fig. 1 or fig. 2 for details, which is not described herein again.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (10)
1. A method for processing an electromagnetic signal, wherein a processing procedure of a target electromagnetic signal includes N processing periods, wherein N is an integer greater than 1, the method comprising:
performing integration processing on a target electromagnetic signal and an auxiliary signal according to a first cycle of the auxiliary signal between a first processing time interval and an N-1 processing time interval to obtain a plurality of amplitude values of the target electromagnetic signal;
selecting a signal channel corresponding to the maximum amplitude value as a detection channel of the phase value;
in the Nth processing time period, according to the second period of the auxiliary signal, performing integration processing on the target electromagnetic signal and the auxiliary signal to obtain a phase value of the target electromagnetic signal;
analyzing the amplitude value and the phase value according to the association relationship between a preset amplitude value and the phase value to obtain a phase change value of the target electromagnetic signal;
wherein the first period is different from the second period.
2. The method of claim 1, wherein before integrating the target electromagnetic signal and the auxiliary signal according to the second period of the auxiliary signal to obtain the phase value of the target electromagnetic signal, further comprising:
acquiring the period of the target electromagnetic signal;
and setting the second period according to the period of the target electromagnetic signal.
3. The method of claim 2, wherein setting the second period as a function of the period of the target electromagnetic signal comprises:
and setting the second period as a period which has a phase difference of pi from the target electromagnetic signal and is the same as the period of the target electromagnetic signal.
4. The method according to any one of claims 1-3, wherein before the integrating the target electromagnetic signal and the auxiliary signal according to the first cycle of the auxiliary signal to obtain the plurality of amplitude values of the target electromagnetic signal between the first processing period and the N-1 processing period, the method further comprises:
the first period is set according to a time interval between the electromagnetic signal transmitted by the antenna array and the received electromagnetic signal.
5. The method according to claim 4, before performing integration processing on the target electromagnetic signal and the auxiliary signal according to the first cycle of the auxiliary signal to obtain the amplitude value of the target electromagnetic signal between the first processing period and the N-1 processing period, further comprising:
filtering the received electromagnetic signal to obtain a filtered electromagnetic signal;
and rectifying the filtered electromagnetic signal to obtain a rectified electromagnetic signal which is used as the target electromagnetic signal.
6. An electromagnetic signal processing device is characterized in that a target electromagnetic signal processing process comprises N processing time periods, wherein N is an integer greater than 1, and the device comprises a phase amplitude detection module and a processor;
the phase amplitude detection module is used for performing integration processing on a target electromagnetic signal and an auxiliary signal according to a first cycle of the auxiliary signal between a first processing time interval and an N-1 processing time interval to obtain a plurality of amplitude values of the target electromagnetic signal; selecting a signal channel corresponding to the maximum amplitude value as a detection channel of the phase value; in the Nth processing time period, according to the second period of the auxiliary signal, performing integration processing on the target electromagnetic signal and the auxiliary signal to obtain a phase value of the target electromagnetic signal;
the processor is used for analyzing the amplitude value and the phase value according to the association relationship between the preset amplitude value and the preset phase value to obtain a phase change value of the target electromagnetic signal;
wherein the first period is different from the second period.
7. The apparatus of claim 6, wherein the processor is further configured to obtain a period of the target electromagnetic signal, and wherein the second period is set according to the period of the target electromagnetic signal.
8. The apparatus of claim 6 or 7, wherein the processor is further configured to set the first period based on a time interval between the electromagnetic signal transmitted by the antenna array and the electromagnetic signal received by the antenna array.
9. The apparatus of claim 8, further comprising:
the filter is used for filtering the received electromagnetic signals to obtain filtered electromagnetic signals;
and the rectifier is used for rectifying the filtered electromagnetic signal to obtain a rectified electromagnetic signal which is used as the target electromagnetic signal.
10. A system for processing electromagnetic signals, comprising an electromagnetic pen and a device for processing electromagnetic signals according to any one of claims 6 to 9;
the processing device of the electromagnetic signal is provided with an antenna array;
and signal interaction is carried out between the electromagnetic pen and the antenna array.
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| CN110413159B (en) * | 2019-07-25 | 2023-03-31 | 青岛罗博智慧教育技术有限公司 | Electromagnetic touch handwriting device with automatic phase correction function |
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| GB0319945D0 (en) * | 2003-08-26 | 2003-09-24 | Synaptics Uk Ltd | Inductive sensing system |
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