CN103677339B - The wireless communication system of time writer, electromagnetic touch reception device and both compositions - Google Patents
The wireless communication system of time writer, electromagnetic touch reception device and both compositions Download PDFInfo
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Abstract
The present invention relates to electromagnetic touch field, the wireless communication system of a kind of time writer, electromagnetic touch reception device and both compositions is disclosed.In the present invention, wireless launcher is provided with time writer, after useful signal composition data frame and modulation, electromagnetic touch reception device is sent to by electromagnetic wave for the useful signal for gathering time writer；Wireless receiver is provided with electromagnetic touch reception device, for the electromagnetic signal launched by antenna array receiver time writer, the signal received is filtered and analog-to-digital conversion is carried out and obtains data signal, data signal is pre-processed using Digital Signal Processing, reconciliation frame is demodulated, the bit data flow received and output.It is no longer simple to rely on Frequency Transfer information so that abundant information transmission can be carried out between time writer and electromagnetic touch reception device by being sent by useful signal composition data frame and after modulating using the solution of the present invention.
Description
Technical field
The present invention relates to electromagnetic touch technology, more particularly to time writer, electromagnetic touch reception device and both compositions
Wireless communication system.
Background technology
Touch technology is used in many products as input control.With smart mobile phone, the popularization of tablet personal computer, touch-control
Technology is more widely applied.These equipment are because portability, and limitation of equipment size etc. does not generally have external keyboard
The input equipments such as mouse.Touch-control input has powerful attraction as a kind of naturally convenient input method.Touch-control inputs skill
Art also has a variety of classification, and wherein stylus input is an important application.Using stylus, user can be in equipment directly
Handwriting input is carried out, can be operated with analog mouse.Touch-control pen input device generally uses the technology based on electromagnetic radiation.Such as
Shown in Fig. 1, in smart mobile phone, tablet personal computer in the equipment such as handwriting pad, implants to receive the antenna array of electromagnetic signal
Row.When in use, stylus sends some form of electromagnetic signal, in contact panel receiving terminal, by detecting on these antenna
Reception signal, the effect of writing can be reached with information such as the positions of interpretation stylus.
Electromagnetic induction touch technology is divided into two major classes, and one is passive type, and also known as without battery pen technology, Wacom dominates city
, possess the basic patent of the technology；It is not required to packed battery in the time writer of passive electromagnetic sensing and has resonant circuit, electromagnetism is touched
The electromagnetic field that reception device launches exchange via antenna is controlled, time writer receives the energy of ac magnetic field and stored, now
Electromagnetic touch reception device is returned by time writer transmitting electromagnetic riveting machine signal；Electromagnetic touch reception device and time writer are respectively provided with two-way day
Line.The technical disadvantages are that energy conversion efficiency is less than 1/200, and power consumption is larger.Two be active, and time writer needs to insert battery,
Launch signal.Volume, the weight of time writer are limited to battery sizes, can also use charged lithium cells.Its basic technology patent is
The root touch-control that rubs is possessed.In active electromagnetic touch, electromagnetic riveting machine signal to the electromagnetism that time writer can actively launch specific frequency is touched
The aerial array in reception device is controlled, electromagnetic touch reception device receives signal and passes to master control IC and handled and computing,
Position and a pressure pressure for time writer is drawn, to realize touch operation.Under this scenario, time writer only needs to launch signal, electricity
Magnetic touch-control reception device need not launch electromagnetic riveting machine signal, it is only necessary to receive signal.Compare active and passive type, it is active to save
More advantageous in terms of electricity, sensing distance and noise, record rate, passive type then has advantage in convenience and the weight of pen.
In existing active electromagnetism touch scheme, what time writer was transmitted is typically single-frequency or continuous swept-frequency signal, electromagnetism
Touch-control reception device can only receive the intensity and frequency information of signal by detecting, determine that time writer needs the effective letter transmitted
Breath.And the change of frequency is more dull, only random notes pressure approximately linear change, so the information content very little of transmission.In addition, electric at present
The frequency of the signal of magnetic pen transmitting uses analog-modulated, and its anti-interference and receptivity is all poor.
The content of the invention
It is an object of the invention to provide the radio communication of a kind of time writer, electromagnetic touch reception device and both compositions
System so that abundant information transmission can be carried out between time writer and electromagnetic touch reception device.
In order to solve the above technical problems, embodiments of the present invention provide a kind of time writer, comprising：Data input mould
Block, framing module, modulation module and antenna；
The data input module gathers useful signal；
The framing module constitutes the useful signal data frame being made up of frame head and frame；Wherein, it is described useful
Signal is carried in the frame；
The modulation module is modulated to the data flow of every bit in the data frame；
The antenna launches electromagnetic wave, will carry out warbled data flow and has been sent to electromagnetic touch reception device.
Embodiments of the present invention additionally provide a kind of electromagnetic touch reception device, comprising：Aerial array, bandpass filtering
Device, analog-digital converter, data signal pretreatment module, digital demodulating block, bit synchronization judging module, frame synchronization module, solution frame
Module and data outputting module；
The bandpass filter is filtered to the electromagnetic signal that the time writer by antenna array receiver is launched；
Filtered signal is converted into data signal by the analog-digital converter；
The data signal pretreatment module carries out down coversion, reduction of speed rate and filtering to the data signal, obtains base band
Signal；
The digital demodulating block is demodulated to the baseband signal；
The bit synchronization judging module carries out bit synchronization to the signal of demodulation output, and makes decisions output；
The frame synchronization module searches for frame head in the bit data flow that the bit sync module is exported；
The solution frame module carries out solution frame, obtains bit data flow after frame synchronization completion；
The data outputting module exports the bit data flow that the solution frame is obtained.
Embodiments of the present invention additionally provide the radio communication system of a kind of time writer and electromagnetic touch reception device composition
System, comprising：Above-mentioned time writer and above-mentioned electromagnetic touch reception device.
The present invention in terms of existing technologies, constitutes radio communication system between time writer and electromagnetic touch reception device
System, is provided with wireless launcher in time writer, and the useful signal for gathering time writer by useful signal composition data frame and is adjusted
After system, electromagnetic touch reception device is sent to by electromagnetic wave；Wireless receiver is provided with electromagnetic touch reception device, is used
In the electromagnetic signal launched by antenna array receiver time writer, the signal received is filtered and analog-to-digital conversion is carried out obtained
To data signal, data signal is pre-processed using Digital Signal Processing, reconciliation frame is demodulated, the ratio received
Special data flow is simultaneously exported.Using the solution of the present invention, by that useful signal composition data frame and will send after modulating, no longer singly
Pure dependence Frequency Transfer information so that abundant information transmission can be carried out between time writer and electromagnetic touch reception device.Together
When, because the wireless launcher in time writer uses the wireless receiver in digital modulation, electromagnetic touch reception device to use number
Word is demodulated, and digital modulation is better than the characteristic of analog-modulated in itself, therefore the performance of system is also greatly improved.
In addition, also including：Interleaver, scrambler between the data input module and the framing module and
One correction verification module；
The useful signal that the interleaver gathers the data input module carries out data order rearrangement；
The output of the interleaver and local fixed sequence program are carried out XOR by the scrambler；
The data that first correction verification module is exported to scrambler calculate check code, obtain the number of the second predetermined bit
According to exporting to the framing module.
Whitening processing is carried out to useful signal with Code scrambling technique using interweaving, makes useful signal that there is certain pseudorandom
Property, while having enough conversion again, continuous 1 or 0 appearance is prevented, the reliability of communication can be improved；In frame structure
Middle addition check code, may further ensure that the reliability of data communication.
In addition, the framing module generates frame head and frame by the following method：
It regard the fixed data of the first predetermined bit as the frame head；
The data of the second predetermined bit exported by first correction verification module generate the frame：
The data of second predetermined bit are divided into some sections, every section of bit number is identical；Wherein, final stage is school
Code is tested, remaining section is the data that the scrambler is exported；
The 0 of 1 bit is filled at the end of final stage, the insertion data of 1 bit are inserted at the end of remaining section, it is described to insert
Enter data to be obtained according to the calculating of the previous data-conversion of insertion position.
Designed by above-mentioned rational frame, may further ensure that the accuracy of receiving terminal frame synchronization；And method letter
It is single, it is easy to accomplish.
In addition, the useful signal of the time writer is included：Equipment identification id code, key information and pressure information.Can be by
Abundant information is transmitted as useful signal by framing, makes to carry out between time writer and electromagnetic touch reception device rich
Rich information transmission.
In addition, in the step of modulation module is modulated to the data flow of every bit in the data frame, adopting
Any one in the following methods is modulated：Frequency shift keying fsk, amplitude shift keying ASK, phase-shift keying (PSK) PSK.Can be according to reality
Existing complexity, the requirement of antijamming capability, flexible selecting modulation mode.
In addition, the electromagnetic touch reception device is also included：Positioned at it is described solution frame module and the data outputting module it
Between the second correction verification module, descrambler and deinterleaver；
Second correction verification module calculates check code to the bit data flow of the solution frame module output, and with the solution
The check code of frame module output is compared, and judges whether two check codes are consistent；When two check codes are consistent, by the number
Exported according to the part in frame in addition to check code to the descrambler；
The descrambler carries out XOR to the output of the correction verification module with local fixed sequence program；Wherein, it is described local
Fixed sequence program is identical with the local fixed sequence program that scrambler in the time writer is used；
Output of the deinterleaver to the descrambler carries out data rearrangement；Wherein, the rule of data rearrangement and institute
The rule for stating interleaver progress data rearrangement in time writer is opposite.
The data of digital demodulation are verified, descrambled using Digital Signal Processing in electromagnetic touch reception device
Code and deinterleaving, recover the bit data flow of useful signal, can further improve systematic function.
In addition, when the frame synchronization module searches for frame head in the bit data flow that the bit synchronization judging module is exported,
The time of the search is more than the length of two data frames.Ensure that one surely correctly captures a continuous and complete number
According to frame.
In addition, the frame synchronization module is included：Antenna scanning submodule；
The antenna scanning submodule is according to the residence time being pre-configured with each antenna, progressively scanning antenna array
In each antenna or a portion antenna；Wherein, by setting data frame, scan frequency and length, at least one is made
Complete frame was appeared in the sweep time of an antenna.So that the design of wireless launcher is very simple, it is suitable for time writer
The requirement of simple small volume；And the synchronization of wireless receiver can also be very simple, it is only necessary to be absorbed in the data of single pass
, it is not necessary to across the synchronization of antenna.
Brief description of the drawings
Fig. 1 is the electromagnetic touch device schematic diagram according to prior art；
Fig. 2 is that the wireless communication system constituted according to the time writer and electromagnetic touch reception device of embodiment of the present invention shows
It is intended to；
Fig. 3 is the process schematic of wireless launcher progress framing in the time writer according to first embodiment of the invention；
Fig. 4 is the frame synchronization signal of wireless receiver in the electromagnetic touch reception device according to second embodiment of the invention
Figure.
Embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with each reality of the accompanying drawing to the present invention
The mode of applying is explained in detail.However, it will be understood by those skilled in the art that in each embodiment of the invention,
In order that reader more fully understands the application and proposes many ins and outs.But, even if without these ins and outs and base
Many variations and modification in following embodiment, can also realize each claim of the application technical side claimed
Case.
The first embodiment of the present invention is related to a kind of time writer, and wireless launcher is provided with the time writer, this is wireless hair
Emitter gathers the useful signal of time writer, and after useful signal composition data frame and modulation, electromagnetism is sent to by electromagnetic wave
Touch-control reception device.That is, wireless launcher is a part for time writer, the useful signal that will mainly collect, example
EIC equipment identification code (ID codes), key information and the pressure information of such as time writer, by rationally designing, according to certain data
The structure of frame carries out shift keying modulation, and is wirelessly transferred by way of electromagnetic wave.That is, can will be abundant
Information is transmitted as useful signal by framing, makes to carry out abundant letter between time writer and electromagnetic touch reception device
Breath transmission.
As shown in Fig. 2 time writer is included：Data input module, framing module, modulation module and antenna；Wherein, data are defeated
Enter the useful signal that module gathers time writer；Framing module constitutes useful signal the data frame being made up of frame head and frame；Its
In, useful signal is carried in the frame；Modulation module is modulated to the data flow of every bit of data frame in；Antenna is sent out
Radio magnetic wave, will carry out warbled data flow and has been sent to electromagnetic touch reception device.
Time writer is also included：Interleaver, scrambler and the first verification between data input module and framing module
Module；The useful signal that interleaver enters data into module collection carries out data order rearrangement；Scrambler is by the output of interleaver
XOR is carried out with local fixed sequence program；The data that first correction verification module is exported to scrambler calculate check code, obtain second pre-
If the data of bit, are exported to framing module.Whitening processing is carried out to useful signal with Code scrambling technique using interweaving, makes useful letter
Number have certain pseudo-randomness, while again have enough conversion, prevent continuous 1 or 0 appearance, communication can be improved
Reliability；Check code is added in the frame structure, may further ensure that the reliability of data communication.
Specifically, wireless launcher is provided with time writer, the wireless launcher includes data input, interweaves, and scrambler is followed
The modules such as ring redundancy (CRC) verification, framing, and frequency shift keying (FSK) modulation.Data input module is mainly responsible for useful signal
Collection.Whitening processing is carried out to useful signal with Code scrambling technique using interweaving, while making it have certain pseudo-randomness,
There is enough conversion again, prevent continuous 1 or 0 data from occurring, so as to improve the reliability of communication.In frame knot
CRC check code is added in structure, it is ensured that the reliability of data communication.In framing module, suitable frame head and conjunction are added
Reason design frame structure, improves the synchronous accuracy of receiver frame.FSK modulation module carries out frequency modulation(PFM) to the data flow of 1 bit,
Corresponding data 1 are that frequency is fc+fd, and the corresponding frequency of data 0 is fc-fd.Fc is carrier frequency, and fd is then frequency shift (FS)
Amount.The speed of data flow, carrier frequency and frequency offset can be carried out flexible configuration.If, the speed of data flow
For 25Kbps, using 200KHz carrier wave, frequency offset is 12.5KHz, then the index of modulation of this FSK modulation mode is just
For 0.5, the corresponding tranmitting frequency of data 1 is 212.5KHz, and the corresponding tranmitting frequency of data 0 is 187.5KHz.Further, since frequency
Shift keyed signals have permanent envelope trait, therefore, and its envelope amplitude is used for detecting the energy for receiving signal, and frequency modulating section
Pen pressure and the function information of other multifunctional pens can be transmitted.The modulation system that modulation module is used can be in the following manner
Any one：Frequency shift keying (FSK), amplitude shift keying (ASK), phase-shift keying (PSK) (PSK).Other modulation systems are similar with FSK,
This is no longer repeated one by one.In actual applications, can be according to the requirement of implementation complexity, antijamming capability, flexibly selection modulation
Mode.
In addition, what deserves to be explained is, data frame packet contains：Frame head and frame；Framing module generates frame head by the following method
And frame：
It regard the fixed data of the first predetermined bit as frame head；The number of the second predetermined bit exported by the first correction verification module
According to generation frame：The data of second predetermined bit are divided into some sections, every section of bit number is identical；Wherein, final stage is school
Code is tested, remaining section is the data that scrambler is exported；The 0 of 1 bit is filled at the end of final stage, is inserted at the end of remaining section
The insertion data of 1 bit, the insertion data are calculated according to the previous data-conversion of insertion position and obtained.Fig. 3 is wireless transmission
Device sends a concrete composition flow chart of data flow, and 15 bit useful informations are interleaved, scrambler, after CRC check, add frame
The data frame of 31 bits is constituted after head, and interpolation, is specifically comprised the steps of：
Step 301, low level is filled：15 bit useful informations, lowest order filling 0, constitute the input data [15 of 2 bytes:
0]。
Step 302, interweave：After interleaver is 4X4 interleaver matrix, intertexture, low level is filled to obtained input number
According to being rearranged by OPADD in Fig. 3.
Step 303, scrambler is exported：The output of interleaver is carried out with local 16 fixed sequence programs 0,101 0,101 01010101
XOR.
Step 304, cyclic redundancy (CRC) is verified：CRC module calculates 4 bit CRC to 16 bit datas that scrambler is exported
Check code, altogether 20 bit.
Plus frame head and segmentation step 305,：The frame head of data frame is 6 bit fixed datas 111110, and frame is exported by CRC
16+4 bit datas composition.20 bit datas are first divided into 5 sections, every section of 4 bits.First four sections 16 bit numbers for scrambler output
According to the 5th section of check code for CRC generations.1 bit data X is inserted to preceding four segment datas end respectively, according to insertion position
Previous data-conversion calculating obtains each section of X.Fill 1 bit 0 in 5th section of end.Include frame head and frame per frame data
Body, is altogether 31 bits.
Designed by above-mentioned rational frame, may further ensure that the accuracy of receiving terminal frame synchronization；And method letter
It is single, it is easy to accomplish.
Second embodiment of the present invention is related to a kind of electromagnetic touch reception device, and the electromagnetic touch reception device is provided with nothing
Line receiver, the electromagnetic signal that wireless receiver is launched by antenna array receiver time writer is filtered to the signal received
Ripple simultaneously carries out analog-to-digital conversion and obtains data signal, and the data signal is pre-processed using Digital Signal Processing, solved
Harmonic solution frame, the bit data flow received and output.
Electromagnetic touch reception device is included：Aerial array, bandpass filter, analog-digital converter, data signal pretreatment mould
Block, digital demodulating block, bit synchronization judging module, frame synchronization module, solution frame module and data outputting module；Wherein, band logical is filtered
Ripple device to by antenna array receiver to time writer launch electromagnetic signal be filtered；Analog-digital converter is by filtered letter
Number it is converted into data signal；Data signal pretreatment module is used to carry out down coversion, reduction of speed rate and filtering to data signal, obtains
Baseband signal；Digital demodulating block is demodulated to baseband signal；Bit synchronization judging module is used to enter the signal of demodulation output
Line position is synchronous, and makes decisions output；Frame synchronization module searches for frame head in the bit data flow that bit sync module is exported；Solve frame
Module is used for after frame synchronization completion, carries out solution frame, verification, descrambling code and deinterleaving, obtains bit data flow；Data output
Module will solve the bit data flow output that frame is obtained.
In addition, electromagnetic touch reception device is also included：The second verification between solution frame module and data outputting module
Module, descrambler and deinterleaver；Second correction verification module calculates check code to the bit data flow of solution frame module output, and
It is compared with the check code of solution frame module output, judges whether two check codes are consistent；When two check codes are consistent, by number
Exported according to the part in frame in addition to check code to descrambler；
Descrambler carries out XOR to the output of correction verification module with local fixed sequence program；Wherein, local fixed sequence program and electricity
The local fixed sequence program that scrambler is used in magnetic pen is identical；
Output of the deinterleaver to descrambler carries out data rearrangement；Wherein, handed in the rule and time writer of data rearrangement
The rule for knitting device progress data rearrangement is opposite.
The data of digital demodulation are verified, descrambled using Digital Signal Processing in electromagnetic touch reception device
Code and deinterleaving, recover the bit data flow of useful signal, can further improve systematic function.
Specifically, as shown in Fig. 2 being provided with wireless receiver in electromagnetic touch reception device, the wireless receiver is main
Include bandpass filter, analog-digital converter, digital mixing, cascade digital variable Rate wave filter, FSK digital demodulations, bit synchronization
Judgement, frame synchronization solves frame, and CRC check, descrambling code is deinterleaved.
Bandpass filter is filtered to the signal that antenna is received, and filters out out-of-band interference signal.And provide what be can configure
Gain.Ensure that wireless receiver has enough receiving sensitivities and dynamic range.The centre frequency of bandpass filter can be with
Configured according to different transmission carrier frequencies.Data signal is converted analog signals into by analog-digital converter, number is utilized
Word signal processing technology, down coversion, reduction of speed rate, filtering are carried out to data signal.
The demodulation mode that demodulation module is used is corresponding with the modulation system used in time writer.To be used in time writer
Exemplified by FSK modulation, the digital demodulating block of electromagnetic touch receiving terminal is believed the FSK modulation base band of input using four phase correlation techniques
Number it is demodulated.Formula 1 is specific demodulating process.I (n) and Q (n) in formula 1 are respectively the digital orthogonal baseband signal of input,
M is configurable data delay, and D (n) is FSK demodulated output signals.
D (n)=Q (n) × I (n-m)-I (n) × Q (n-m) (formula 1)
The signal that bit synchronization judging module is used to demodulate FSK output carries out bit synchronization, and makes decisions output.It is right first
FSK demodulation outputs are integrated, and the length of integration depends on over-sampling speed.If the sampling rate of FSK demodulation outputs is
125KHz, data transfer rate is 25Kbps, then N=125/25=5 in formula 2.
In formula, L (n) is to be integrated obtained integrated signal to FSK demodulated output signals.
N roads are divided into according to over-sampling rate to integrator, the judgement of optimal judgement path is calculated according to formula 3 to every road respectively
Factor P, that is, take the maximum in N roads.The bit number that M in formula 3 adjudicates for needs.
Factor P is adjudicated according to the optimal judgement path calculated, the output L (n) of integrator is made decisions.
BitOut (n)=SIGN (L (P+ (n-1) × N)) (formula 4)
SIGN in formula 4 is represented to make decisions signal, and 1 is judged to more than zero, and 0 is judged to less than or equal to zero.
BitOut (n) represents judgement output, and value is 0 or 1.
Frame synchronization module searches for frame head (6b ' 111110) in the bit data flow that bit sync module is exported.Searched
Suo Shi, the time of search is more than the length of two data frames.As long as that is, ensureing that the time of search is more than two data frames
Length, that, which is ensured that necessarily, has a continuous and complete data frame correctly to be captured, as shown in figure 4, wirelessly
The data frame that transmitter is sent represents that diagonal line hatches represent that the antenna time is long, and blank represents the antenna time with 1,2,3,4,5,6
It is short, when antenna time length is more than length (i.e. length of the search time more than two data frames) of two data frames, wirelessly connect
Receive device and receive data flow, carry out in frame synchronizing process, data frame 1 and 6 can be accurately captured.In addition, what deserves to be explained is, frame is same
Step module is included：Antenna scanning submodule；The antenna scanning submodule according to the residence time being pre-configured with each antenna,
Progressively scan each antenna or a portion antenna wherein, by setting data frame, scan frequency and length, make at least one
Individual complete frame was appeared in the sweep time of an antenna.That is, in order to simplify wireless receiver and wireless launcher
Synchronization, data frame design coordinate wireless receiver scan frequency and length, it is ensured that wireless receiver be in adjust
During frequency reception state, at least one complete frame can be appeared in the sweep time of an antenna.So, wireless launcher
Design it is very simple, it is only necessary to using the frame structure of design, continuously transmit useful information, whether change per the data of frame
The frequency changed depending on useful information, same group information is possible to be repeated quickly and easily as many times as required.So simple framework is suitable for electromagnetism
The requirement of the simple small volume of pen.And the synchronization of wireless receiver can also be very simple, it is only necessary to be absorbed in the number of single pass
According to, it is not necessary to across the synchronization of antenna.
With regard to carrying out solution frame, CRC check, descrambling code and deinterleaving after frame synchronization is complete, finally output receives bit number
According to stream.
Third embodiment of the invention is related to the wireless communication system of a kind of time writer and electromagnetic touch reception device composition,
Comprising：The electromagnetic touch reception device described in time writer and second embodiment described in first embodiment.
The present invention in terms of existing technologies, constitutes radio communication system between time writer and electromagnetic touch reception device
System, is provided with wireless launcher in time writer, and the useful signal for gathering time writer by useful signal composition data frame and is adjusted
After system, electromagnetic touch reception device is sent to by electromagnetic wave；Wireless receiver is provided with electromagnetic touch reception device, is used
In the electromagnetic signal launched by antenna array receiver time writer, the signal received is filtered and analog-to-digital conversion is carried out obtained
To data signal, data signal is pre-processed using Digital Signal Processing, reconciliation frame is demodulated, the ratio received
Special data flow is simultaneously exported.Using the solution of the present invention, by that useful signal composition data frame and will send after modulating, no longer singly
Pure dependence Frequency Transfer information so that abundant information transmission can be carried out between time writer and electromagnetic touch reception device.Together
When, because the wireless launcher in time writer uses the wireless receiver in digital modulation, electromagnetic touch reception device to use number
Word is demodulated, and digital modulation is better than the characteristic of analog-modulated in itself, therefore the performance of system is also greatly improved.
It will be understood by those skilled in the art that the respective embodiments described above are to realize the specific embodiment of the present invention,
And in actual applications, can to it, various changes can be made in the form and details, without departing from the spirit and scope of the present invention.
Claims (9)
1. a kind of time writer, it is characterised in that include：Data input module, framing module, modulation module and antenna；
The data input module gathers the useful signal of the time writer；
The framing module constitutes the useful signal data frame being made up of frame head and frame；Wherein, the useful signal
Carry in the frame；
The modulation module is modulated to the data flow of every bit in the data frame；
The antenna launches electromagnetic wave, will carry out warbled data flow and has been sent to electromagnetic touch reception device；
Also include interleaver, scrambler and the first calibration mode being located between the data input module and the framing module
Block；
The useful signal that the interleaver gathers the data input module carries out data order rearrangement；
The output of the interleaver and local fixed sequence program are carried out XOR by the scrambler；
The data that first correction verification module is exported to scrambler calculate check code, obtain the data of the second predetermined bit, defeated
Go out to the framing module.
2. time writer according to claim 1, it is characterised in that the framing module generate by the following method frame head and
Frame：
It regard the fixed data of the first predetermined bit as the frame head；
The data of the second predetermined bit exported by first correction verification module generate the frame：
The data of second predetermined bit are divided into some sections, every section of bit number is identical；Wherein, final stage is verification
Code, remaining section is the data that the scrambler is exported；
The 0 of 1 bit is filled at the end of final stage, the insertion data of 1 bit, the insertion number are inserted at the end of remaining section
Obtained according to being calculated according to the previous data-conversion of insertion position.
3. time writer according to claim 1, it is characterised in that the useful signal of the time writer is included：Equipment is recognized
ID codes, key information and pressure information.
4. time writer according to claim 1, it is characterised in that in the modulation module to often comparing in the data frame
In the step of special data flow is modulated, in the following ways in any one be modulated：Frequency shift keying fsk, amplitude shift
Keying ASK, phase-shift keying (PSK) PSK.
5. a kind of electromagnetic touch reception device, it is characterised in that include：Aerial array, bandpass filter, analog-digital converter, number
Word signal pre-processing module, digital demodulating block, bit synchronization judging module, frame synchronization module, solution frame module and data output mould
Block；
The bandpass filter is filtered to the electromagnetic signal that the time writer by antenna array receiver is launched；
Filtered signal is converted into data signal by the analog-digital converter；
The data signal pretreatment module carries out down coversion, reduction of speed rate and filtering to the data signal, obtains baseband signal；
The digital demodulating block is demodulated to the baseband signal；
The bit synchronization judging module carries out bit synchronization to the signal of demodulation output, and makes decisions output；
The frame synchronization module searches for frame head in the bit data flow that the bit sync module is exported；
The solution frame module carries out solution frame, obtains bit data flow after frame synchronization completion；
The data outputting module exports the bit data flow that the solution frame is obtained；
Also include the second correction verification module being located between the solution frame module and the data outputting module, descrambler and conciliate friendship
Knit device；
Second correction verification module calculates check code to the bit data flow of the solution frame module output, and solves frame mould with described
The check code of block output is compared, and judges whether two check codes are consistent；When two check codes are consistent, by the solution frame mould
Part in block output in addition to check code is exported to the descrambler；
The descrambler carries out XOR to the output of the correction verification module with local fixed sequence program；Wherein, the local fixation
Sequence is identical with the local fixed sequence program that scrambler in the time writer is used；
Output of the deinterleaver to the descrambler carries out data rearrangement；Wherein, the rule of data rearrangement and the electricity
The rule of interleaver progress data rearrangement is opposite in magnetic pen.
6. electromagnetic touch reception device according to claim 5, it is characterised in that the frame synchronization module is same in institute's rheme
When walking search frame head in the bit data flow of judging module output, the time of the search is more than the length of two data frames.
7. electromagnetic touch reception device according to claim 6, it is characterised in that the frame synchronization module is included：Antenna
Scan submodule；
The antenna scanning submodule is according to the residence time being pre-configured with each antenna, progressively in scanning antenna array
Each antenna or a portion antenna；Wherein, by setting data frame, scan frequency and length, make at least one complete
Frame appear in the sweep time of an antenna.
8. electromagnetic touch reception device according to claim 5, it is characterised in that the digital demodulating block is to the base
Used demodulation mode is corresponding with the modulation system used in time writer when band signal is demodulated.
9. the wireless communication system of a kind of time writer and electromagnetic touch reception device composition, it is characterised in that include：As right will
Ask the time writer described in 1 to 4 any one and the electromagnetic touch reception device as described in any one of claim 5 to 8.
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