CN103677339A - Electromagnetic pen, electromagnetic touch receiving device and wireless communication system composed of electromagnetic pen and electromagnetic touch receiving device - Google Patents
Electromagnetic pen, electromagnetic touch receiving device and wireless communication system composed of electromagnetic pen and electromagnetic touch receiving device Download PDFInfo
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Abstract
The invention relates to the field of electromagnetic touch, and discloses an electromagnetic pen, an electromagnetic touch receiving device and a wireless communication system composed of the electromagnetic pen and the electromagnetic touch receiving device. In the electromagnetic pen, the electromagnetic touch receiving device and the wireless communication system, a wireless transmitter is arranged in the electromagnetic pen and used for collecting useful signals of the electromagnetic pen and sending the useful signals to the electromagnetic touch receiving device through electromagnetic waves after the useful signals are combined to form data frames and modulated. A wireless receiver is arranged in the electromagnet touch receiving device and used for receiving electromagnetic signals transmitted by the electromagnetic pen through an antenna array, conducting filtering on the received signals, and conducting analog-digital conversion on the received signals to obtain digital signals. Preprocessing, demodulation and frame decoding are conducted on the digital signals through the digital signal processing technology, and received bit data flow is obtained and outputted. According to the scheme, the useful signals are sent after being combined to form the data frames and modulated, information is transmitted without purely relying on frequencies, and therefore abundant information transmission can be conducted between the electromagnetic pen and the electromagnetic touch receiving device.
Description
Technical field
The present invention relates to electromagnetism touch technology, particularly the wireless communication system of time writer, electromagnetism touch-control receiving trap and both compositions.
Background technology
Touch technology is used as input control in a lot of products.Along with smart mobile phone, panel computer universal, the application of touch technology is more extensive.These equipment are because portable, and restriction of equipment size etc. does not have the external input equipments such as keyboard and mouse conventionally.Touch-control input as a kind of naturally easily input method there is powerful attractive force.Touch-control input technology also has multiple classification, and wherein pointer input is an important application.Utilize pointer, user can directly carry out handwriting input on equipment, all right analog mouse operation etc.Pointer input equipment adopts the technology based on electromagnetic radiation conventionally.As shown in Figure 1, at smart mobile phone, panel computer, in the equipment such as handwriting pad, has implanted the aerial array that is specifically designed to receiving electromagnetic signals.In use, pointer is sent the electromagnetic signal of certain form, and at contact panel receiving end, by detecting the reception signal on these antenna, the information such as position that can interpretation pointer, reach the effect of writing.
Electromagnetic induction touch technology is divided into two large classes, and one is passive type, is called again without battery pen technology, and Wacom dominates market, has the basic patent of this technology; In the time writer of passive electromagnetic sensing, do not need packed battery and have resonant circuit, the electromagnetic field that electromagnetism touch-control receiving trap exchanges via antenna transmission, time writer receives the energy of ac magnetic field and stores, and now is by time writer transmitting electromagnetic riveting machine signal telegram in reply magnetic touch-control receiving trap; Electromagnetism touch-control receiving trap and time writer all have bilateral antenna.This technical disadvantages be energy conversion efficiency lower than 1/200, power consumption is larger.Two is active, and time writer need to be inserted battery, transmitting signal.Volume, the weight of time writer are limited to battery sizes, also can adopt charged lithium cells.Its basic technology patent is had by the root touch-control that rubs.In active electromagnetism touch-control, the electromagnetic riveting machine signal that time writer can initiatively be launched characteristic frequency is to the aerial array on electromagnetism touch-control receiving trap, electromagnetism touch-control receiving trap receives signal and passes to master control IC and processes and computing, draw position and a pressure pressure of time writer, to realize touch operation.Under this scheme, time writer only need to be launched signal, and electromagnetism touch-control receiving trap does not need to launch electromagnetic riveting machine signal, only need to receive signal.More active and passive type, is actively having superiority aspect power saving, detection-sensitive distance and noise, record rate, and passive type is tool advantage in the weight of convenience and pen.
In existing active electromagnetism touch-control scheme, the normally single-frequency that time writer transmits or continuously swept-frequency signal, electromagnetism touch-control receiving trap can only receive intensity and the frequency information of signal by detection, determine the effective information that time writer need to transmit.And the variation of frequency is more dull, only random notes press approximately linear to change, so the quantity of information of transmitting is very little.In addition, the frequency of the signal of time writer transmitting at present adopts analog-modulated, and it is anti-interference and receptivity is all poor.
Summary of the invention
The wireless communication system that the object of the present invention is to provide a kind of time writer, electromagnetism touch-control receiving trap and both compositions, makes can carry out abundant information transmission between time writer and electromagnetism touch-control receiving trap.
For solving the problems of the technologies described above, embodiments of the present invention provide a kind of time writer, comprise: data input module, framing module, modulation module and antenna;
Described data input module gathers useful signal;
Described framing module forms described useful signal the Frame being comprised of frame head and frame; Wherein, described useful signal is carried in described frame;
Described modulation module is modulated the data stream of the every bit in described Frame;
Described antenna transmission electromagnetic wave, has carried out warbled data stream and has sent to electromagnetism touch-control receiving trap described.
Embodiments of the present invention also provide a kind of electromagnetism touch-control receiving trap, comprise: aerial array, bandpass filter, analog to digital converter, digital signal pretreatment module, digital demodulation module, bit synchronization judging module, frame synchronization module, solution frame module and data outputting module;
Described bandpass filter is carried out filtering to the electromagnetic signal of the time writer transmitting receiving by aerial array;
Described analog to digital converter converts filtered signal to digital signal;
Described digital signal pretreatment module is carried out down coversion, reduction of speed rate and filtering to described digital signal, obtains baseband signal;
Described digital demodulator carries out demodulation to described baseband signal;
Described bit synchronization judging module is carried out bit synchronization to the signal of demodulation output, and adjudicates output;
Described frame synchronization module is searched for frame head in the bit data flow of described bit synchronization module output;
Described solution frame module, after frame synchronization completes, is separated frame, obtains bit data flow;
The bit data flow output that described data outputting module obtains described solution frame.
The wireless communication system that embodiments of the present invention also provide a kind of time writer and electromagnetism touch-control receiving trap to form, comprises: above-mentioned time writer and above-mentioned electromagnetism touch-control receiving trap.
The present invention in terms of existing technologies, between time writer and electromagnetism touch-control receiving trap, form wireless communication system, in time writer, be provided with wireless launcher, for gathering the useful signal of time writer, after useful signal is formed to Frame modulation, by electromagnetic wave, send to electromagnetism touch-control receiving trap; In electromagnetism touch-control receiving trap, be provided with wireless receiver, for receive the electromagnetic signal of time writer transmitting by aerial array, carry out to the received signal filtering and carry out analog to digital conversion obtaining digital signal, adopt Digital Signal Processing to carry out pre-service, demodulation frame to digital signal, the bit data flow that obtains receiving output.Adopt the solution of the present invention, after useful signal being formed to Frame modulation, send, rely on no longer merely Frequency Transfer information, make can carry out abundant information transmission between time writer and electromagnetism touch-control receiving trap.Meanwhile, because the wireless launcher in time writer adopts Digital Modulation, the wireless receiver in electromagnetism touch-control receiving trap adopts digital demodulation, and Digital Modulation itself is better than the characteristic of analog-modulated, so the performance of system also improves greatly.
In addition, also comprise: interleaver, scrambler and the first correction verification module between described data input module and described framing module;
Described interleaver carries out data order rearrangement by the useful signal of described data input module collection;
Described scrambler carries out XOR by the output of described interleaver and local fixed sequence program;
Described the first correction verification module calculates check code to the data of scrambler output, obtains the data of the second default bit, exports to described framing module.
Utilization interweaves and scrambler technology is carried out albefaction processing to useful signal, makes useful signal have certain pseudo-randomness, has again abundant conversion simultaneously, prevents 1 or 0 continuous appearance, can improve the reliability of communication; In frame structure, add check code, can further guarantee the reliability of data communication.
In addition, described framing module generates frame head and frame by the following method:
Using the fixed data of the first default bit as described frame head;
The data of the second default bit of being exported by described correction verification module generate described frame:
The data of the described second default bit are divided into some sections, and the bit number of every section is identical; Wherein, final stage is check code, and all the other sections are the data of described scrambler output;
In the end 0 of 1 bit is filled at the end of a section, inserts the data inserting of 1 bit at the end of all the other sections, and described data inserting calculates according to the previous data-conversion of insertion position.
By above-mentioned rational frame, design, can further guarantee the accuracy of receiving end frame synchronization; And method is simple, be easy to realize.
In addition, the useful signal of described time writer comprises: recognition of devices ID code, key information and pressure information.Can by framing, transmit using abundant information as useful signal, make to carry out abundant information transmission between time writer and electromagnetism touch-control receiving trap.
In addition, described modulation system is any one in following mode: frequency shift keying fsk, amplitude shift keying ASK, phase-shift keying (PSK) PSK.Can be according to the requirement of implementation complexity, antijamming capability, flexible selecting modulation mode.
In addition, described electromagnetism touch-control receiving trap also comprises: the second correction verification module, descrambler and deinterleaver between described solution frame module and described data outputting module;
Described the second correction verification module calculates check code to the bit data flow of described solution frame module output, and compares with the check code of described solution frame module output, judges that whether two check codes are consistent; When two check codes are consistent, the part except check code in described Frame is exported to described descrambler;
Described descrambler carries out XOR to the output of described correction verification module and local fixed sequence program; Wherein, described local fixed sequence program is identical with the local fixed sequence program that scrambler in described time writer uses;
Described deinterleaver carries out data rearrangement to the output of described descrambler; Wherein, the rule of data rearrangement is contrary with the rule that interleaver in described time writer carries out data rearrangement.
In electromagnetism touch-control receiving trap, adopt Digital Signal Processing to carry out verification, descrambling code and deinterleaving to the data of digital demodulation, recover the bit data flow of useful signal, can further improve system performance.
In addition, when described frame synchronization module is searched for frame head in the bit data flow of described bit synchronization judging module output, the time of described search is greater than the length of two Frames.Guarantee that one correctly surely captures a continuous and complete Frame.
In addition, described frame synchronization module comprises: antenna scanning submodule;
Described antenna scanning submodule is according to the residence time being pre-configured on each antenna, progressively each antenna in scanning antenna array or wherein a part of antenna; Wherein, by Frame, sweep frequency and length are set, make to have at least a complete frame to appear in the sweep time of an antenna.Make the design of wireless launcher very simple, be suitable for the little requirement of the simple volume of time writer; And wireless receiver synchronously also can be very simple, only need to be absorbed in the data of single pass, not need to across antenna synchronously.
Accompanying drawing explanation
Fig. 1 is the electromagnetism touch control device schematic diagram according to prior art;
Fig. 2 is according to the wireless communication system schematic diagram of the time writer of embodiment of the present invention and electromagnetism touch-control receiving trap composition;
Fig. 3 carries out the process schematic diagram of framing according to wireless launcher in the time writer of first embodiment of the invention;
Fig. 4 is according to the frame synchronization schematic diagram of wireless receiver in the electromagnetism touch-control receiving trap of second embodiment of the invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing, the embodiments of the present invention are explained in detail.Yet, persons of ordinary skill in the art may appreciate that in each embodiment of the present invention, in order to make reader understand the application better, many ins and outs have been proposed.But, even without these ins and outs and the many variations based on following embodiment and modification, also can realize each claim of the application technical scheme required for protection.
The first embodiment of the present invention relates to a kind of time writer, in this time writer, is provided with wireless launcher, and this wireless launcher gathers the useful signal of time writer, after useful signal is formed to Frame modulation, by electromagnetic wave, sends to electromagnetism touch-control receiving trap.That is to say, wireless launcher is a part for time writer, mainly by the useful signal collecting, EIC equipment identification code (ID code), key information and pressure information etc. such as time writer, pass through appropriate design, according to the structure of certain Frame, carry out shift keying modulation, and carry out wireless transmission by electromagnetic mode.That is to say, can by framing, transmit using abundant information as useful signal, make to carry out abundant information transmission between time writer and electromagnetism touch-control receiving trap.
As shown in Figure 2, time writer comprises: data input module, framing module, modulation module and antenna; Wherein, data input module gathers the useful signal of time writer; Framing module forms useful signal the Frame being comprised of frame head and frame; Wherein, useful signal is carried in described frame; Modulation module is modulated the data stream of the every bit in Frame; Antenna transmission electromagnetic wave, sends to electromagnetism touch-control receiving trap by carrying out warbled data stream.
Time writer also comprises: the interleaver between data input module and framing module, scrambler and the first correction verification module; Interleaver carries out data order rearrangement by the useful signal of data input module collection; Scrambler carries out XOR by the output of interleaver and local fixed sequence program; The first correction verification module calculates check code to the data of scrambler output, obtains the data of the second default bit, exports to framing module.Utilization interweaves and scrambler technology is carried out albefaction processing to useful signal, makes useful signal have certain pseudo-randomness, has again abundant conversion simultaneously, prevents 1 or 0 continuous appearance, can improve the reliability of communication; In frame structure, add check code, can further guarantee the reliability of data communication.
Specifically, be provided with wireless launcher in time writer, this wireless launcher comprises and interweaves data inputs, scrambler, cyclic redundancy (CRC) verification, framing, and the module such as frequency shift keying (FSK) modulation.Data input module is mainly responsible for the collection of useful signal.Utilization interweaves and scrambler technology is carried out albefaction processing to useful signal, when making it have certain pseudo-randomness, has again abundant conversion, prevents that continuous 1 or 0 data from occurring, thereby can improve the reliability of communication.In frame structure, add CRC check code, can guarantee the reliability of data communication.In framing module, add suitable frame head and appropriate design frame structure, improve the synchronous accuracy of receiver frame.FSK modulation module carries out frequency modulation (PFM) to the data stream of 1 bit, data 1 correspondence be that frequency is fc+fd, the frequency of data 0 correspondence is fc-fd.Fc is carrier frequency, and fd is frequency offset.The speed of data stream, carrier frequency and frequency offset can configure flexibly.If the speed of data stream is 25Kbps, adopt the carrier wave of 200KHz, frequency offset is 12.5KHz, the index of modulation of so this FSK modulation system is just 0.5, and the transmission frequency of data 1 correspondence is 212.5KHz, and the transmission frequency of data 0 correspondence is 187.5KHz.In addition, because frequency shift keyed signals has permanent envelope trait, therefore, its envelope amplitude is used for detecting the energy that receives signal, and frequency modulation (PFM) part can be transmitted, pen is pressed and the function information of other multifunctional pens.The modulation system that modulation module adopts can be any one in following mode: frequency shift keying (FSK), amplitude shift keying (ASK), phase-shift keying (PSK) (PSK).Other modulation systems and FSK are similar, and this is no longer going to repeat them.In actual applications, can be according to the requirement of implementation complexity, antijamming capability, flexible selecting modulation mode.
In addition, what deserves to be explained is, data frame packet contains: frame head and frame; Framing module generates frame head and frame by the following method:
Using the fixed data of the first default bit as frame head; The data of the second default bit of being exported by correction verification module generate frame: the data of the second default bit are divided into some sections, and the bit number of every section is identical; Wherein, final stage is check code, and all the other sections are the data of scrambler output; In the end 0 of 1 bit is filled at the end of a section, inserts the data inserting of 1 bit at the end of all the other sections, and this data inserting calculates according to the previous data-conversion of insertion position.Fig. 3 is the concrete process flow diagram that forms that wireless launcher sends data stream, and 15 bit useful informations through interweaving, after scrambler, CRC check, add frame head, and after interpolation, form the Frame of 31 bits, specifically comprise following steps:
By above-mentioned rational frame, design, can further guarantee the accuracy of receiving end frame synchronization; And method is simple, be easy to realize.
The second embodiment of the present invention relates to a kind of electromagnetism touch-control receiving trap, this electromagnetism touch-control receiving trap is provided with wireless receiver, wireless receiver receives the electromagnetic signal of time writer transmitting by aerial array, carry out to the received signal filtering and carry out analog to digital conversion obtaining digital signal, adopt Digital Signal Processing to carry out pre-service, demodulation frame to described digital signal, the bit data flow that obtains receiving output.
Electromagnetism touch-control receiving trap comprises: aerial array, bandpass filter, analog to digital converter, digital signal pretreatment module, digital demodulation module, bit synchronization judging module, frame synchronization module, solution frame module and data outputting module; Wherein, bandpass filter is carried out filtering to the electromagnetic signal of the time writer transmitting receiving by aerial array; Analog to digital converter converts filtered signal to digital signal; Digital signal pretreatment module, for digital signal is carried out to down coversion, reduction of speed rate and filtering, obtains baseband signal; Digital demodulator carries out demodulation to baseband signal; Bit synchronization judging module is carried out bit synchronization for the signal that demodulation is exported, and adjudicates output; In the bit data flow of frame synchronization module synchronization module output in place, search for frame head; Separate frame module for after frame synchronization completes, separate frame, verification, descrambling code and deinterleaving, obtain bit data flow; The bit data flow output that data outputting module obtains solution frame.
In addition, electromagnetism touch-control receiving trap also comprises: at the second correction verification module, descrambler and the deinterleaver separated between frame module and data outputting module; The second correction verification module calculates check code to separating the bit data flow of frame module output, and compares with the check code of separating frame module output, judges that whether two check codes are consistent; When two check codes are consistent, the part except check code in Frame is exported to descrambler;
Descrambler carries out XOR to the output of correction verification module and local fixed sequence program; Wherein, local fixed sequence program is identical with the local fixed sequence program that scrambler in time writer uses;
Deinterleaver carries out data rearrangement to the output of descrambler; Wherein, the rule of data rearrangement is contrary with the rule that interleaver in time writer carries out data rearrangement.
In electromagnetism touch-control receiving trap, adopt Digital Signal Processing to carry out verification, descrambling code and deinterleaving to the data of digital demodulation, recover the bit data flow of useful signal, can further improve system performance.
Specifically, as shown in Figure 2, in electromagnetism touch-control receiving trap, be provided with wireless receiver, this wireless receiver has mainly comprised bandpass filter, analog to digital converter, digital mixing, cascade digital variable Rate wave filter, FSK digital demodulation, bit synchronization judgement, frame synchronization, separate frame, CRC check, descrambling code, deinterleaving.
Bandpass filter to antenna reception to signal carry out filtering, the outer undesired signal of filtering band.And provide configurable gain.Guarantee that wireless receiver has enough receiving sensitivities and dynamic range.The centre frequency of bandpass filter can be configured according to different transmission carrier frequency.By analog to digital converter, convert simulating signal to digital signal, utilize Digital Signal Processing, digital signal is carried out to down coversion, reduction of speed rate, filtering.
The demodulation mode that demodulation module adopts is corresponding with the modulation system of using in time writer.To adopt FSK to be modulated to example in time writer, the digital demodulation module of electromagnetism touch-control receiving end utilizes four phase correlation techniques to carry out demodulation to the FSK modulating baseband signal of input.Formula 1 is concrete demodulating process.I in formula 1 (n) and Q (n) are respectively the digital orthogonal baseband signal of input, and m is configurable data delay, and D (n) is FSK demodulated output signal.
D (n)=Q (n) * I (n-m)-I (n) * Q (n-m) (formula 1)
Bit synchronization judging module is carried out bit synchronization for the signal that FSK demodulation is exported, and adjudicates output.First FSK demodulation output is carried out to integration, the length of integration depends on over-sampling speed.If the sampling rate of FSK demodulation output is 125KHz, data transfer rate is 25Kbps, so N=125/25=5 in formula 2.
In formula, L (n) is for to carry out to FSK demodulated output signal the integrated signal that integration obtains.
Integrator is divided into N road according to over-sampling rate, and Dui Mei road calculates optimal judgement path judgement factor P according to formula 3 respectively, namely gets the maximal value in N road.M in formula 3 is for needing the bit number of judgement.
Optimal judgement path judgement factor P according to calculating, adjudicates the output L (n) of integrator.
BitOut (n)=SIGN (L (P+ (n-1) * N)) (formula 4)
SIGN in formula 4 represents signal to adjudicate, be greater than zero be judged to 1, be less than or equal to zero be judged to 0.BitOut (n) represents judgement output, and value is 0 or 1.
In the bit data flow of frame synchronization module synchronization module output in place, search for frame head (6b ' 111110).When searching for, the time of search is greater than the length of two Frames.That is to say, as long as guarantee that the time of search is greater than the length of two Frames, that just guarantees necessarily to have the continuous and complete Frame can be by correct capturing, as shown in Figure 4, the Frame that wireless launcher sends represents with 1,2,3,4,5,6, diagonal line hatches represents that the antenna time is long, the blank expression antenna time is short, while growing up length (being the length that is greater than two Frames search time) in two Frames in the antenna time, wireless receiver receiving data stream, carry out in frame synchronizing process, can accurately capture Frame 1 and 6.In addition, what deserves to be explained is, frame synchronization module comprises: antenna scanning submodule; This antenna scanning submodule is according to the residence time being pre-configured on each antenna, progressively scan each antenna or wherein a part of antenna is wherein, by Frame, sweep frequency and length are set, make to have at least a complete frame to appear in the sweep time of an antenna.That is to say, in order to simplify the synchronous of wireless receiver and wireless launcher, the design of Frame coordinates sweep frequency and the length of wireless receiver, can guarantee during in FM reception state, to have at least a complete frame can appear in the sweep time of an antenna at wireless receiver.Like this, the design of wireless launcher is very simple, only needs to utilize the frame structure of design, sends continuously useful information, and whether the data of every frame change the frequency that depends on that useful information changes, and same group of information is likely repeated repeatedly.So simple framework is suitable for the little requirement of the simple volume of time writer.And wireless receiver synchronously also can be very simple, only need to be absorbed in the data of single pass, not need to across antenna synchronously.
After frame synchronization is complete, just separate frame, CRC check, descrambling code and deinterleaving, finally output receives bit data flow.
Third embodiment of the invention relates to the wireless communication system of a kind of time writer and electromagnetism touch-control receiving trap composition, comprises: the electromagnetism touch-control receiving trap described in the time writer described in the first embodiment and the second embodiment.
The present invention in terms of existing technologies, between time writer and electromagnetism touch-control receiving trap, form wireless communication system, in time writer, be provided with wireless launcher, for gathering the useful signal of time writer, after useful signal is formed to Frame modulation, by electromagnetic wave, send to electromagnetism touch-control receiving trap; In electromagnetism touch-control receiving trap, be provided with wireless receiver, for receive the electromagnetic signal of time writer transmitting by aerial array, carry out to the received signal filtering and carry out analog to digital conversion obtaining digital signal, adopt Digital Signal Processing to carry out pre-service, demodulation frame to digital signal, the bit data flow that obtains receiving output.Adopt the solution of the present invention, after useful signal being formed to Frame modulation, send, rely on no longer merely Frequency Transfer information, make can carry out abundant information transmission between time writer and electromagnetism touch-control receiving trap.Meanwhile, because the wireless launcher in time writer adopts Digital Modulation, the wireless receiver in electromagnetism touch-control receiving trap adopts digital demodulation, and Digital Modulation itself is better than the characteristic of analog-modulated, so the performance of system also improves greatly.
Persons of ordinary skill in the art may appreciate that the respective embodiments described above are to realize specific embodiments of the invention, and in actual applications, can to it, do various changes in the form and details, and without departing from the spirit and scope of the present invention.
Claims (11)
1. a time writer, is characterized in that, comprises: data input module, framing module, modulation module and antenna;
Described data input module gathers the useful signal of described time writer;
Described framing module forms described useful signal the Frame being comprised of frame head and frame; Wherein, described useful signal is carried in described frame;
Described modulation module is modulated the data stream of the every bit in described Frame;
Described antenna transmission electromagnetic wave, has carried out warbled data stream and has sent to electromagnetism touch-control receiving trap described.
2. time writer according to claim 1, is characterized in that, also comprises: interleaver, scrambler and the first correction verification module between described data input module and described framing module;
Described interleaver carries out data order rearrangement by the useful signal of described data input module collection;
Described scrambler carries out XOR by the output of described interleaver and local fixed sequence program;
Described the first correction verification module calculates check code to the data of scrambler output, obtains the data of the second default bit, exports to described framing module.
3. time writer according to claim 2, is characterized in that, described framing module generates frame head and frame by the following method:
Using the fixed data of the first default bit as described frame head;
The data of the second default bit of being exported by described correction verification module generate described frame:
The data of the described second default bit are divided into some sections, and the bit number of every section is identical; Wherein, final stage is check code, and all the other sections are the data of described scrambler output;
In the end 0 of 1 bit is filled at the end of a section, inserts the data inserting of 1 bit at the end of all the other sections, and described data inserting calculates according to the previous data-conversion of insertion position.
4. time writer according to claim 1, is characterized in that, the useful signal of described time writer comprises: recognition of devices ID code, key information and pressure information.
5. time writer according to claim 1, is characterized in that, described modulation system is any one in following mode: frequency shift keying fsk, amplitude shift keying ASK, phase-shift keying (PSK) PSK.
6. an electromagnetism touch-control receiving trap, it is characterized in that, comprise: aerial array, bandpass filter, analog to digital converter, digital signal pretreatment module, digital demodulation module, bit synchronization judging module, frame synchronization module, solution frame module and data outputting module;
Described bandpass filter is carried out filtering to the electromagnetic signal of the time writer transmitting receiving by aerial array;
Described analog to digital converter converts filtered signal to digital signal;
Described digital signal pretreatment module is carried out down coversion, reduction of speed rate and filtering to described digital signal, obtains baseband signal;
Described digital demodulator carries out demodulation to described baseband signal;
Described bit synchronization judging module is carried out bit synchronization to the signal of demodulation output, and adjudicates output;
Described frame synchronization module is searched for frame head in the bit data flow of described bit synchronization module output;
Described solution frame module, after frame synchronization completes, is separated frame, obtains bit data flow;
The bit data flow output that described data outputting module obtains described solution frame.
7. electromagnetism touch-control receiving trap according to claim 6, is characterized in that, also comprises: the second correction verification module, descrambler and deinterleaver between described solution frame module and described data outputting module;
Described the second correction verification module calculates check code to the bit data flow of described solution frame module output, and compares with the check code of described solution frame module output, judges that whether two check codes are consistent; When two check codes are consistent, the part except check code in described Frame is exported to described descrambler;
Described descrambler carries out XOR to the output of described correction verification module and local fixed sequence program; Wherein, described local fixed sequence program is identical with the local fixed sequence program that scrambler in described time writer uses;
Described deinterleaver carries out data rearrangement to the output of described descrambler; Wherein, the rule of data rearrangement is contrary with the rule that interleaver in described time writer carries out data rearrangement.
8. electromagnetism touch-control receiving trap according to claim 6, is characterized in that, when described frame synchronization module is searched for frame head in the bit data flow of described bit synchronization judging module output, the time of described search is greater than the length of two Frames.
9. electromagnetism touch-control receiving trap according to claim 8, is characterized in that, described frame synchronization module comprises: antenna scanning submodule;
Described antenna scanning submodule is according to the residence time being pre-configured on each antenna, progressively each antenna in scanning antenna array or wherein a part of antenna; Wherein, by Frame, sweep frequency and length are set, make to have at least a complete frame to appear in the sweep time of an antenna.
10. electromagnetism touch-control receiving trap according to claim 6, is characterized in that, described demodulation mode is corresponding with the modulation system of using in time writer.
The wireless communication system that 11. 1 kinds of time writers and electromagnetism touch-control receiving trap form, is characterized in that, comprises: the time writer as described in claim 1 to 5 and the electromagnetism touch-control receiving trap as described in claim 6 to 10.
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Cited By (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103902133A (en) * | 2014-03-27 | 2014-07-02 | 泰凌微电子（上海）有限公司 | Electromagnetic touch receiving device and electromagnetic touch receiving method |
| CN106462312A (en) * | 2014-04-30 | 2017-02-22 | 三星电子株式会社 | Method of detecting touch input, apparatus for sensing touch input, and apparatus for inputting touch input |
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