CN101295345A - Radio frequency recognition reading device - Google Patents
Radio frequency recognition reading device Download PDFInfo
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- CN101295345A CN101295345A CNA2007101021518A CN200710102151A CN101295345A CN 101295345 A CN101295345 A CN 101295345A CN A2007101021518 A CNA2007101021518 A CN A2007101021518A CN 200710102151 A CN200710102151 A CN 200710102151A CN 101295345 A CN101295345 A CN 101295345A
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Abstract
A radio frequency identification and reading device comprises a signal processing module, which is used for converting a transmission signal sent by an electronic tag to an input signal; a first matching filter, which is coupled with the signal processing module and used for generating a first matching signal based on the input signal and pattern of a first preset signal; a second matching filter, which is coupled with the signal processing module and used for generating a second matching signal based on the input signal and pattern of a second preset signal; a control unit, which is used for generating a control signal based on the input signal; and a decision unit, which is coupled with the first matching filter, the second matching filter and the control unit and used for comparing the first matching signal and the second matching signal based on the control signal, thus generating a read-back signal.
Description
Technical field
The present invention relates to REID, particularly relate to the framework of radio frequency recognition reading device.
Background technology
Reduction along with development of technology and cost, (radio frequencyidentification, RFID) technology has been widely used in such as aviation luggage monitoring, warehousing management, logistics management, taking care of books, antitheft safety system, automatic fare collection system, quality management, and many fields such as medical control radio-frequency (RF) identification.In radio-frequency recognition system, radio frequency recognition reading device (RFIDinterrogator/reader) is to utilize the less radio-frequency signal to carry out untouchable half-duplex data transmission with electric label (RFID tag) to each other, to reach purposes such as object identification or exchanges data.
Electric label can generally be divided into active electronics label (active tag) and two kinds of frameworks of passive type electric label (passive tag) usually.Active electronics label comprises built-in power supply, so can initiatively send data to radio frequency recognition reading device, its actual induction distance is longer, but the life-span is short, volume is big and cost is higher.The passive type electric label does not then have built-in power supply, and the radio-frequency (RF) signal that its received RF reading devices is sent also to the internal circuit operation required electric energy of converting.Compared to active electronics label, the volume of passive type electric label is less, cost is lower and the life-span is longer.
When electric label is received the query statement that radio frequency recognition reading device sends, (unique) recognition data of a uniqueness is returned to radio frequency recognition reading device for identification.Existing passive type electric label there is no built-in crystal oscillator (crystal oscillator), normally utilizes the LC oscillator that required reference frequency is provided.Yet the frequency regular meeting drift (drift) that LC oscillator institute resonance comes out causes the symbol time (symbol time) of the signal that the passive type electric label returned that very big variation is arranged.Such situation can increase the possibility of existing radio frequency recognition reading device to the recognition data demodulation mistake that receives, thereby reduces the overall efficiency of radio-frequency recognition system.
Summary of the invention
Therefore, one of purpose of the present invention is to provide the radio frequency recognition reading device of the signal that correct demodulation electric label returned, to address the above problem.
The invention provides a kind of embodiment of radio frequency recognition reading device, it includes: a signal processing module, and the transmission signal that is used for transmitting according to electric label produces input signal; One first matched filter is coupled to this signal processing module, is used for producing the first coupling signal according to this input signal and the first predetermined signal type sample; One second matched filter is coupled to this signal processing module, is used for producing the second coupling signal according to this input signal and the second predetermined signal type sample; One control module is used for producing controlling signal according to this input signal; And a decision unit, being coupled to this first, second matched filter and this control module, it compares this first coupling signal and this second according to this controlling signal and mates signal with the generation signal that reads back.
The present invention also provides a kind of embodiment of radio frequency recognition reading device, it includes: a signal processing module, the transmission signal that is used for transmitting according to electric label produces and detects signal and input signal, and wherein this detection signal is corresponding with the transition of this input signal; One first matched filter is coupled to this signal processing module, is used for producing the first coupling signal according to this input signal and the first predetermined signal type sample; One second matched filter is coupled to this signal processing module, is used for producing the second coupling signal according to this input signal and the second predetermined signal type sample; One control module is coupled to this detection signal, is used for producing a controlling signal; And a decision unit, being coupled to this first, second matched filter and this control module, it compares this first coupling signal and this second according to this controlling signal and mates signal with the generation signal that reads back.
Description of drawings
Fig. 1 is the calcspar after an embodiment of radio frequency recognition reading device of the present invention simplifies.
Fig. 2 is the calcspar after an embodiment of the signal processing module among Fig. 1 simplifies.
Fig. 3 is the sequential chart of a running embodiment of the detuner among Fig. 2.
Fig. 4 is the calcspar after an embodiment of the control module among Fig. 1 simplifies.
Fig. 5 is the sequential chart of the running embodiment of control module when input signal is FM0 coding signal of Fig. 4.
Fig. 6 is the sequential chart of the running embodiment of control module when input signal is Miller basis signal of Fig. 4.
Fig. 7 is the calcspar after another embodiment of radio frequency recognition reading device of the present invention simplifies.
Fig. 8 is the calcspar after an embodiment of the Miller detuner among Fig. 7 simplifies.
Fig. 9 be Fig. 8 the Miller detuner one the running embodiment sequential chart.
Figure 10 is the calcspar after an embodiment of the control module among Fig. 7 simplifies.
The reference numeral explanation
| 100、700 | Radio frequency |
| 110、710 | The |
| 120、130、720、730 | Matched |
| 140、740 | |
| 150、750 | The |
| 210、712 | Analog-to- |
| 220、714 | The Miller detuner |
| 222、810 | The |
| 224、820、840 | The signal comparer |
| 226、850 | |
| 230 | The |
| 300、500、600、900 | |
| 410 | Detecting |
| 420、1010 | Counter |
| 430、1020 | Comparator circuit |
| 502、504、506、508 | FM0 coding signal |
| 510、520、530、540、550、610、 620、630、640、650、660 | Time |
| 502、504、506、508 | Miller basis |
| 760 | Miller basis signal |
| 770 | Miller basis signal reconstructor |
| 830 | Delay cell |
Embodiment
Please refer to Fig. 1, the calcspar after its radio frequency recognition reading device (RFIDinterrogator/reader) 100 that shows one embodiment of the invention is simplified.As shown in the figure, radio frequency recognition reading device 100 includes signal processing module 110, first matched filter (matched filter), 120, second matched filter 130, control module 140 and decision unit 150.In running, the radio-frequency antenna of radio frequency recognition reading device 100 (figure does not show) utilizes radio-frequency (RF) signal to send query statement (Querycommand), after the electric label (RFID tag) that is positioned at effective transmission range of this radio-frequency (RF) signal is received this query statement, give radio frequency recognition reading device 100 with data back in backscattering mode (backscatter).
When the receiver module of radio frequency recognition reading device 100 (figure does not show) was received the analog transmission signal A1 that electric label transmits, radio frequency recognition reading device 100 utilized signal processing module 110 to produce input signal S1 according to transmission signal A1.On real the work, the transmission signal A1 that electric label transmitted may have different data encoding formaies.For example, the data encoding format that electric label is commonly used has two kinds of FM0 coding (FM0 encoding) and Miller code (Miller encoding).The instruction that electric label is sent according to radio frequency recognition reading device 100 selects corresponding digital coding mode to modulate the data that will send radio frequency recognition reading device 100 to.If transmission signal A1 is a FM0 coding signal, signal processing module 110 converts transmission signal A1 to digital format by analog format, with as input signal S1.If transmission signal A1 is the Miller code signal, then signal processing module 110 is reduced into Miller basis signal (Miller basis signal) with this Miller code signal, with as input signal S1.Below, will further specify the running and the embodiment of signal processing module 110 in conjunction with Fig. 2.
Calcspar after an embodiment who Figure 2 shows that signal processing module 110 simplifies.In the present embodiment, signal processing module 110 includes analog-to-digital converter (ADC) 210, Miller detuner 220 and signal selector switch 230.Analog-to-digital converter 210 is used for converting the transmission signal A1 of analog format to digital signal D1.At transmission signal A1 is under the situation of FM0 coding signal, and signal selector switch 230 exports digital signal D1 (that is the coding of the FM0 after digitizing signal) as input signal S1.If transmission signal A1 is the Miller code signal, then signal processing module 110 is utilized the digital signal D1 (that is Miller code signal digitizing after) of Miller detuner 220 with analog-to-digital converter 210 outputs, be demodulated to Miller basis signal, and this Millers basis signal of signal selector switch 230 outputs is with as input signal S1.On real the work, signal processing module 110 can be an activation Miller detuner 220 just under the situation of Miller code signal at transmission signal A1 also, to save required electrical power consumed.
As shown in Figure 2, the Miller detuner 220 of present embodiment comprises subcarrier generator (subcarriergenerator) 222 and signal comparer 224.When transmission signal A1 was the Miller code signal, subcarrier generator 222 produced and the corresponding subcarrier signal of transmission signal A1 Sb.224 of signal comparers are used for comparative figures signal D1 (that is the Miller code signal after the digitizing) and subcarrier signal Sb, to produce Miller basis signal Mb.
Please refer to Fig. 3, it is depicted as the sequential chart 300 of a running embodiment of Miller detuner 220.For convenience of description, hypothesis digital signal D1 corresponds to the Miller code signal that data sequence 0100 and M value equal 2 in Fig. 3.Because the size of M value is actually specified by radio frequency recognition reading device 100, so be known for subcarrier generator 222 M values.In addition, subcarrier generator 222 can be estimated Baud Length (symbol length) among the digital signal D1 according to the preamble symbol among the digital signal D1 (preamble), and, produce the subcarrier signal Sb shown in the sequential chart 300 according to Baud Length and this M value of estimating gained.In preferred embodiment, subcarrier generator 222 aligns the phase place of subcarrier signal Sb with digital signal D1.In the present embodiment, signal comparer 224 is an XOR (XOR logic), is used for digital signal D1 and subcarrier signal Sb are carried out XOR, to produce Miller basis signal Mb as shown in Figure 3.In this example, because digital signal D1 is the Miller code signal, so the basic signal Mb of signal selector switch 230 output Millers are with as input signal S1.
Note that the signal comparer 224 in the aforementioned Miller detuner 220, also can use anteiso-or logic (NXOR logic) on the Yu Shizuo instead and realize.In a preferred embodiment, Miller detuner 220 also is provided with a noise eliminator (glitch remover) 226 in the back level of signal comparer 224, is used for reducing the noise among the Miller basis signal Mb that signal comparer 224 exported.
Then, first matched filter 120 produces the first coupling signal M1 according to the input signal S1 and the first predetermined signal type sample, and second matched filter 130 then produces the second coupling signal M2 according to the input signal S1 and the second predetermined signal type sample.At transmission signal A1 under the situation of FM0 coding signal (that is input signal S1 FM0 coding signal after being digitizing), the predetermined signal type samples of first matched filter 120 employed first are corresponding to data 0 code element of FM0 coded format, and second matched filter, 130 employed second predetermined signal type samples are then corresponding to data 1 code element of FM0 coded format.On the other hand, at transmission signal A1 (that is input signal S1 is a Miller basis signal) under the situation of Miller code signal, first matched filter, 120 employed first predetermined signal type samples are corresponding to data 0 code element in the signal of Miller basis, and second matched filter, 130 employed second predetermined signal type samples are then corresponding to data 1 code element in the signal of Miller basis.In the present embodiment, when input signal S1 met this first pre-setting sample, the signal value of the first coupling signal M1 that first matched filter 120 is exported was not greater when meeting this first pre-setting sample than input signal S1.Similarly, when input signal S1 met this second pre-setting sample, the signal value of the second coupling signal M2 that second matched filter 130 is exported was not greater when meeting this second pre-setting sample than input signal S1.
On real the work, also two groups of matched filters can be set in radio frequency recognition reading device 100, comprise two matched filters respectively, one group of design is used for handling the situation that input signal S1 is the FM0 coding signal after the digitizing, and another group then design is used for handling the situation that input signal S1 is a Miller basis signal.In this embodiment, radio frequency recognition reading device 100 can or send to the content of the query statement of electric label according to the type of transmission signal A1, selects corresponding one group of matched filter to use.
Fig. 5 is the sequential chart 500 of the running embodiment of the control module 140 among Fig. 4 when input signal S1 is FM0 coding signal.For for purpose of brevity, four FM0 coding signal code elements 502,504,506 and 508 that correspond respectively to data 0,1,1,0 among the input signal S1 only are shown in the sequential chart 500.In the present embodiment, the detecting device 410 of control module 140 triggers (toggle) pulse when the each transition of input signal S1, to form detection signal P1 as shown in Figure 5.For convenience of description, in the frequency of this hypothesis frenquency signal CLK 40 times of frequency of input signal S1.Under the ideal situation, if counter 420 begins counting at the pairing time point of section start of each code element (symbol) of input signal S1, then when this code element finishes (that is intersection of this code element and next code element), the count value CNT that counter 420 is exported should be 40.
Yet; have the variation existence owing to be derived from the symbol time (symbol time) of the transmission signal A1 of electric label; event is understood inconsequent according to the symbol time of the input signal S1 that transmission signal A1 is produced, and the count value CNT regular meeting that causes counter 420 to be exported when each code element finishes departs from ideal value 40.Moreover the input signal S1 of FM0 coded format also has transition and takes place except having the transition when each code element finishes in the middle of data 0 pairing code element.
Therefore, comparator circuit 430 can be when receiving a pulse (that is detecting device 410 detects the transition of input signal S1) that detects signal P1 at every turn, the count value CNT of counter 420 this moment and the first predetermined threshold value TH1 (for example 30) are compared, be positioned at the boundary of adjacent two code elements or be positioned in the middle of data 0 code element with this time transition of judgement input signal S1.In the present embodiment, be the pairing count value of 3/4 Baud Length that the first predetermined threshold value TH1 is set as a desirable FM0 coding signal code element, that is 30.If count value CNT is less than the first predetermined threshold value TH1 (30), comparator circuit 430 judges that this time transition of input signal S1 is to be positioned at the middle transition of data 0 code element; Otherwise comparator circuit 430 judges that this time transition of input signal S1 is the boundary that is positioned at adjacent two code elements.
Shown in sequential chart 500, counter 420 begins counting in the start time point of FM0 coding signal code element 502.When time point 510, detecting device 410 detects input signal S1 a transition, so produce a pulse to trigger comparator circuit 430 in detecting signal P1.Because the count value CNT (20) of this moment is less than the first predetermined threshold value TH1 (30), comparator circuit 430 judges that this time transition of input signal S1 is to be positioned in the middle of data 0 code element, and controlling signal CTL is maintained at disable level (being the logical zero level in this example).Then, counter 420 is proceeded counting, and count value CNT is up increased progressively.
When time point 520, detecting device 410 detects input signal S1 again a transition, so produce a pulse to trigger comparator circuit 430 in detecting signal P1.Because the count value CNT (40) of this moment is greater than the first predetermined threshold value TH1 (30), comparator circuit 430 judges that this time transition of input signal S1 is the boundary that is positioned at adjacent two code elements.Therefore, comparator circuit 430 produces an activation pulse in controlling signal CTL, mates signal M2 in order to the counting action of (reset) counter 420 of resetting and indication decision unit 150 pairs first couplings signal M1 and second and compares.In like manner, time point 530,540 and 550 o'clock, because count value CNT at that time is greater than the first predetermined threshold value TH1 (30), so comparator circuit 430 is judged this equi-time point and is had a common boundary corresponding to the code element of FM0 coding signal, and in controlling signal CTL, produce corresponding activation pulse, to trigger the counting action of decision unit 150 and counter reset 420.
The mode of aforementioned code element intersection replacement count value CNT at FM0 coding signal can be avoided being accumulated on the count value CNT because of the previous length variation of code element, and the situation that causes comparator circuit 430 in follow-up judgement, to make a mistake.In other words, even the symbol time of input signal S1 deviation to some extent, control module 140 still can correctly be found out the end position of each code element among the input signal S1 of FM0 coded format.
The setting means that note that the aforementioned first predetermined threshold value TH1 is an embodiment only, but not limits to actual embodiment of the present invention.
As previously mentioned, decision unit 150 is when controlling signal CTL triggers, and relatively the first coupling signal M1 and the second signal value of mating signal M2 is with the generation signal RB that reads back.Furthermore, when the activation trigger action of the decision unit of present embodiment 150 controlled signal CTL, the signal RB that will read back is set as logical zero if the value of the first coupling signal M1, then determines unit 150 greater than the second coupling signal M2; The signal RB that will read back is set as logical one and if the value of the first coupling signal M1, then determines unit 150 less than the second coupling signal M2.
Fig. 6 is the sequential chart 600 of the running embodiment of the control module 140 among Fig. 4 when input signal S1 is Miller basis signal.For for purpose of brevity, only show four Miller basis signal code elements 602,604,606 and 608 that correspond respectively to data 0,1,0,0 among the input signal S1 in the sequential chart 600.Identical with previous embodiment, the detecting device 410 of control module 140 is pulse of triggering for generating when the each transition of input signal S1, to form detection signal P1 as shown in Figure 6.For convenience of description, the cycle of employed carrier signal is 4 microseconds (microsecond) when this hypothesis electric label carries out Miller code, and the M value of Miller code is 2.In the case, the ideal code elementary time of the basis of the Miller among input signal S1 signal is 8 microseconds.Suppose that counter 420 is is that the frenquency signal CLK of 10M Hz counts according to frequency, then the length of each code element should be corresponding to count value 80 among the input signal S1.In other words, if counter 420 begins counting at the pairing time point of the section start of each code element of input signal S1, then when this code element finishes (that is intersection of this code element and next code element), the count value CNT that counter 420 is exported should be 80.
Because having variation, the symbol time that is derived from the transmission signal A1 of electric label exists, so the length of the basic signal code element of Miller among the input signal S1 that is produced according to transmission signal A1 also can inconsequent.Moreover according to the characteristic of Miller basis signal, the intersection of adjacent two Millers basis signal code element not necessarily has transition and takes place.Particularly, in the signal of Miller basis, the boundary of continuous two data 0 code elements has transition, also has transition in the middle of data 1 code element, but in the boundary of data 0 code element and data 1 code element, or the boundary of continuous two data 1 code elements does not but have the transition generation.Therefore, the function mode of the comparator circuit 430 of control module 140 when input signal S1 is Miller basis signal, the function mode in the time of can being FM0 coding signal with aforementioned input signal S1 is different.
When receiving the pulse that detects signal P1 (that is detecting device 410 detect input signal S1 one transition is arranged), comparator circuit 430 compares the count value CNT of 420 this moments of counter and the second predetermined threshold value TH2 and the 3rd predetermined threshold value TH3 at every turn.In the present embodiment, it is the pairing count value of 3/4 Baud Length that the second predetermined threshold value TH2 is set as a desirable Miller basis signal code element, that is 60, and the 3rd predetermined threshold value TH3 is set as the pairing count value of 1/4 Baud Length of desirable Miller basis signal code element, that is 30.When comparator circuit 430 was received a pulse that detects signal P1, if the count value CNT of counter 420 is greater than the second predetermined threshold value TH2 (60), comparator circuit 430 can judge that this time transition of input signal S1 is the boundary that is positioned at adjacent two data 0 code elements; If count value CNT is between the second predetermined threshold value TH2 (60) and the 3rd predetermined threshold value TH3 (20), comparator circuit 430 can judge that this time transition is to be positioned in the middle of data 1 code element; And if count value CNT less than the 3rd predetermined threshold value TH3 (20), then comparator circuit 430 judges that this time transitions are the boundaries that are positioned at adjacent two code elements.In addition, when the count value CNT of counter 420 output is incremented to corresponding the 4th predetermined threshold value TH4 of Baud Length (being 80 in this example) with a desirable Miller basis signal code element, even comparator circuit 430 was not received the pulse that detects among the signal P1 (that is detecting device 410 do not detect input signal S1 at that time transition is arranged) at that time, the comparator circuit 430 of present embodiment can suppose that still this time point is the boundary of adjacent two code elements in the signal of Miller basis.
Shown in sequential chart 600, counter 420 is that the start time point in Miller basis signal code element 602 begins counting.When time point 610, the count value CNT of counter 420 outputs is incremented to the 4th predetermined threshold value TH4 (80), but comparator circuit 430 was not received the pulse (that is input signal S1 not transition at that time) that detects among the signal P1 at that time.As previously mentioned, the comparator circuit 430 supposition time points 610 of present embodiment are corresponding to the boundary of adjacent two code elements in the signal of Miller basis, so can be in controlling signal CTL the consistent energy impulse of triggering for generating, mate signal M2 in order to the counting action of counter reset 420 and indication decision unit 150 pairs first couplings signal M1 and second and compare.
When time point 620, detecting device 410 detects input signal S1 a transition, so can produce a pulse to trigger comparator circuit 430 in detecting signal P1.Because the count value CNT (43) of this moment is between the second predetermined threshold value TH2 (60) and the 3rd predetermined threshold value TH3 (20), comparator circuit 430 judges that this time transition of input signal S1 belongs to the middle transition of data 1 code element.In the present embodiment, the transition in the middle of data 1 code element should reach generation in 40 o'clock in count value CNT ideally.Therefore, comparator circuit 430 can directly be adjusted to 40 with counter 420 count value CNT at this moment, makes counter 420 proceed counting by 40.When aforementioned transition in the middle of data 1 code element takes place, count value CNT is adjusted to mode with the corresponding count value of 1/2 Baud Length (being 40 in this example) of desirable Miller basis signal code element, can compensate the influence that the code element length variation is caused count value CNT, and then promote the accuracy of comparator circuit 430 when judging position, subsequent symbol boundary.
When the count value CNT of counter 420 output when time point 630 reaches the 4th predetermined threshold value TH4 (80), though input signal S1 not transition at that time, comparator circuit 430 still can be supposed the boundary of time point 630 for adjacent two code elements in the signal of Miller basis.Because comparator circuit 430 is when the signal code element 604 middle transitions of the Miller basis of corresponding data 1 take place, CNT is adjusted to 40 with count value, so count value CNT is incremented to 80 time point 630, can be very near Miller basis signal code element 604 and 606 intersection (even being exactly the position, boundary of reality).Therefore, comparator circuit 430 produces an activation pulse in controlling signal CTL, to trigger the counting action of decision unit 150 and counter reset 420.
When time point 640, the count value CNT of counter 420 outputs is incremented to the 4th predetermined threshold value TH4 (80) again.In like manner, though comparator circuit 430 was not received the pulse that detects among the signal P1 at that time, but comparator circuit 430 still can be supposed the boundary of time point 640 for adjacent two code elements in the signal of Miller basis, and in controlling signal CTL, produce consistent energy impulse, mate signal M2 with the counting action of counter reset 420 and indication decision unit 150 pairs first couplings signal M1 and second and compare.
Then, soon time point 650 after time point 640 is because detecting device 410 detects input signal S1 one transition is arranged, so produce a pulse with triggering comparator circuit 430 in detecting signal P1.Because the count value CNT (4) of this moment is less than the 3rd predetermined threshold value TH3 (20), comparator circuit 430 is judged input signal S1 in the transition of time point 650, is the actual location of previous institute supposition corresponding to the code element boundary of time point 640.Because comparator circuit 430 just produces consistent energy impulse in the time point 640 soon in controlling signal CTL, so comparator circuit 430 can't produce the activation pulse again when time point 650, but the counting action of meeting counter reset 420 makes counter 420 restart counting by real code element intersection.
When time point 660, because of having a transition, input signal S1 takes place, so detecting device 410 can produce a pulse to trigger comparator circuit 430 in detecting signal P1.The count value CNT (77) of this moment is greater than the second predetermined threshold value TH2 (60), so comparator circuit 430 judges that this time transition of input signal S1 is the boundary that is positioned at continuous two data 0 code elements.Therefore, comparator circuit 430 produces an activation pulse in controlling signal CTL, mates signal M2 in order to action of the counting of counter reset 420 and indication decision unit 150 pairs first couplings signal M1 and second and compares.
Similar with the embodiment that handles FM0 coding signal, the mode of aforementioned code element intersection replacement count value CNT at Miller basis signal, can avoid the length variation of previous code element to be accumulated on the count value CNT, and the accuracy when having influence on comparator circuit 430 and judging positions, subsequent symbol boundary.
From the above, even the symbol time of the basis of the Miller among input signal S1 signal code element has deviation, and not necessarily have transition at the code element intersection and take place, but the framework of aforementioned control module 140 still exactly (or in quite little error range) determine the end position of each code element in the signal of Miller basis.Other note that the setting means of the aforementioned second predetermined threshold value TH2, the 3rd predetermined threshold value TH3 and the 4th predetermined threshold value TH4 is an embodiment only, but not limits to actual embodiment of the present invention.
In the present embodiment, when the activation trigger action of decision unit 150 controlled signal CTL, the signal RB that will read back is set as logical zero if the value of the first coupling signal M1, then determines unit 150 greater than the second coupling signal M2; And be set as logical one if the value of the first coupling signal M1 less than the second coupling signal M2, then determines unit 150 to understand the signal RB that will read back.
Please refer to Fig. 7, the calcspar after its radio frequency recognition reading device 700 that is depicted as another embodiment of the present invention is simplified.As shown in the figure, radio frequency recognition reading device 700 includes signal processing module 710, be used for producing detection signal P2 according to the transmission signal A1 that electric label (figure does not show) is transmitted, and signal transition and the corresponding input signal S1 of detection signal P2; First matched filter 720 is used for producing the first coupling signal M1 according to the input signal S1 and the first predetermined signal type sample; Second matched filter 730 is used for producing the second coupling signal M2 according to the input signal S1 and the second predetermined signal type sample; Control module 740 is used for producing controlling signal CTL; And decision unit 750, be used for when controlling signal CTL triggers, relatively the first coupling signal M1 and second mates signal M2 with the generation signal RB that reads back.
In the present embodiment, transmission signal A1 is the Miller code signal, and input signal S1 is a Miller basis signal (Miller basis signal).In the case, first matched filter, 720 employed first predetermined signal type samples are corresponding to data 0 code element in the signal of Miller basis, and second matched filter, 730 employed second predetermined signal type samples are then corresponding to data 1 code element in the signal of Miller basis.Embodiment is identical as described above, and when input signal S1 met this first pre-setting sample, the signal value of the first coupling signal M1 that first matched filter 720 is exported was not greater when meeting this first pre-setting sample than input signal S1.Similarly, when input signal S1 met this second pre-setting sample, the signal value of the second coupling signal M2 that second matched filter 730 is exported was not greater when meeting this second pre-setting sample than input signal S1.
As shown in Figure 7, signal processing module 710 includes analog-to-digital converter (ADC) 712, is used for converting transmission signal A1 to digital signal D1; And Miller detuner 714, be used for produce detecting signal P2, and produce Miller basis signal with as input signal S1 according to detecting signal P2 according to digital signal D1.In a preferred embodiment, Miller detuner 714 comprises Miller basis signal detecting device (Miller basis signal detector) 760 and Miller basis signal reconstructor (Miller basissignal reconstructor) 770.Signal detecting device 760 designs in Miller basis are used for producing the transition position corresponding detection signal P2 with the pairing Miller of digital signal D1 basis signal, Miller basis signal reconstructor 770 then is used for reconstructing the pairing Miller of digital signal D1 basis signal according to detecting signal P2, with as input signal S1.Below, will further specify the enforcement and the function mode of Miller detuner 714 in conjunction with Fig. 8 and Fig. 9.
Calcspar after an embodiment who Figure 8 shows that Miller detuner 714 of the present invention simplifies.Fig. 9 be Fig. 8 Miller detuner 714 one the running embodiment sequential chart 900.As shown in Figure 8, the Miller of Miller detuner 714 basis signal detecting device 760 includes subcarrier generator 810, the first signal comparer 820, delay cell 830 and the second signal comparer 840.Subcarrier generator 810 is used for producing and the corresponding subcarrier signal of transmission signal A1 Sb.For convenience of description, hypothesis digital signal D1 corresponds to the Miller code signal that data sequence 01000 and M value equal 2 in sequential chart 900.Because the size of M value is specified by radio frequency recognition reading device 700, so be known for subcarrier generator 810 M values.In addition, subcarrier generator 810 can be estimated Baud Length among the digital signal D1 according to the preamble symbol among the digital signal D1 (preamble), and according to estimated value and this M value of Baud Length, produces the subcarrier signal Sb shown in sequential chart 900.
In Miller basis signal detecting device 760, the first signal comparer 820 is used for comparative figures signal D1 and subcarrier signal Sb to produce comparison signal Sc.Delay cell 830 be used for retardation ratio than signal Sc produce to postpone signal Sc '.As for the second signal comparer 840, then be to be used for to relatively signal Sc and delay signal Sc ' compare to produce detection signal P2.In the present embodiment, the first signal comparer 820 is an XOR (XOR logic), be used for digital signal D1 and subcarrier signal Sb are carried out XOR with the comparison signal Sc shown in the output timing diagram 900, and the second signal comparer 840 also is an XOR, is used for to relatively signal Sc and delay signal Sc ' carry out an XOR to produce detection signal P2.
Note that the aforesaid first signal comparer 820 also can use anteiso-or logic (NXORlogic) instead and realize on real the work.In a preferred embodiment, Miller basis signal detecting device 760 also can be provided with noise eliminator 850 in the back level of the second signal comparer 840, is used for reducing the noise that detects among the signal P2.
As shown in Figure 8, Miller basis signal reconstructor 770 is to utilize a D flip-flop (D flip-flop) to realize in the present embodiment, wherein the frequency input end of this D flip-flop is coupled to the detection signal P2 that Miller basis signal detecting device 760 is exported, and its oppisite phase data output terminal then is coupled to its data input pin.Thus, the input signal S1 that the noninverting data output end of this D flip-flop is exported is the pairing Miller of digital signal D1 basis signal.Note that with D flip-flop and realize that Miller basis signal reconstructor 770 is an embodiment only, is not limitation actual embodiment of the present invention.On real the work, trigger or combinational logic that Miller basis signal reconstructor 770 also can be used other type instead are realized.
Please refer to Figure 10, the calcspar after its embodiment who is depicted as the control module 740 of radio frequency recognition reading device 700 simplifies.As shown in the figure, control module 740 includes counter 1010 and comparator circuit 1020.By sequential chart 900 as can be known, the pulse position that detects among the signal P2 is corresponding with the transition position of input signal S1, so detection signal P2 has identical in fact signal meaning with detection signal P1 among Fig. 6.Therefore, in control module 740, the detecting device 410 that is used for detecting the transition of input signal S1 in the earlier figures 4 can be omitted.Because both function modes of the counter 1010 in the control module 740 and comparator circuit 1020, be respectively with earlier figures 4 in counter 420 identical in fact with comparator circuit 430, for for purpose of brevity, in this not repeat specification.
Note that the framework of the aforementioned various radio frequency recognition reading devices of the present invention, not only can promote the accuracy that reads various passive type electric label passback data, also be applicable to the various application of reading active electronics label.
The above only is preferred embodiment of the present invention, and all equalizations of doing according to claim of the present invention change and modify, and all should belong to covering scope of the present invention.
Claims (33)
1. radio frequency recognition reading device, it includes:
One signal processing module is used for producing an input signal according to the transmission signal that an electric label is transmitted;
One first matched filter is coupled to this signal processing module, is used for producing one first coupling signal according to this input signal and one first predetermined signal type sample;
One second matched filter is coupled to this signal processing module, is used for producing one second coupling signal according to this input signal and one second predetermined signal type sample;
One control module is used for producing a controlling signal according to this input signal; And
One decision unit is coupled to this first, second matched filter and this control module, according to this controlling signal relatively this first coupling signal and this second mate signal to produce the signal that reads back.
2. radio frequency recognition reading device as claimed in claim 1, wherein this signal processing module comprises an analog-to-digital converter, is used for converting this transmission signal to digital format by analog format, with as this input signal.
3. radio frequency recognition reading device as claimed in claim 2, wherein this input signal is a FM0 coding signal, this first predetermined signal type sample is corresponding to data 0 code element of FM0 coded format, and this second predetermined signal type sample is corresponding to data 1 code element of FM0 coded format.
4. radio frequency recognition reading device as claimed in claim 2, wherein this control module includes:
One detecting device is used for detecting the transition of this input signal;
One counter is used for counting to export a count value according to a frenquency signal; And
One comparator circuit is coupled to this detecting device and this counter, is used for when this detecting device detects a transition, and relatively this count value and a first threshold are to determine this controlling signal.
5. radio frequency recognition reading device as claimed in claim 4, wherein if this count value greater than this first threshold, then this comparator circuit can utilize this controlling signal to indicate this decision unit that this first coupling signal and this second is mated signal to compare.
6. radio frequency recognition reading device as claimed in claim 5, wherein this comparator circuit counting action of this counter of also can resetting.
7. radio frequency recognition reading device as claimed in claim 1, wherein when this decision unit compared, greater than this second coupling signal, this decision unit output logic 0 was with the signal that reads back as this as if this first value of mating signal; And if this first the coupling signal value less than this second the coupling signal, then this decision unit output logic 1 is with the signal that reads back as this.
8. radio frequency recognition reading device as claimed in claim 1, wherein this signal processing module includes:
One analog-to-digital converter is used for converting this transmission signal to a digital signal; And
One detuner is coupled to this analog-to-digital converter, is used for this digital signal is demodulated to Miller basis signal, with as this input signal.
9. radio frequency recognition reading device as claimed in claim 8, wherein this first predetermined signal type sample is corresponding to data 0 code element in the signal of Miller basis, and this second predetermined signal type sample is corresponding to data 1 code element in the signal of Miller basis.
10. radio frequency recognition reading device as claimed in claim 8, wherein this detuner includes:
One subcarrier generator is used for producing and the corresponding subcarrier signal of this transmission signal; And
One signal comparer is coupled to this subcarrier generator, is used for relatively this digital signal and this subcarrier signal, to produce this Miller basis signal.
11. radio frequency recognition reading device as claimed in claim 10, wherein this detuner also includes a noise eliminator, is coupled to this signal comparer, is used for reducing the noise in this Miller basis signal.
12. radio frequency recognition reading device as claimed in claim 10, wherein this signal comparer is an XOR or an anteiso-or logic.
13. radio frequency recognition reading device as claimed in claim 8, wherein this control module includes:
One detecting device is used for detecting the transition of this input signal;
One counter is used for counting to export a count value according to a frenquency signal; And
One comparator circuit is coupled to this detecting device and this counter, is used for this count value and at least one threshold value are compared, to determine this controlling signal.
14. radio frequency recognition reading device as claimed in claim 13, wherein when this detecting device detects a transition, if this count value is greater than one second threshold value, then this comparator circuit utilizes this controlling signal to indicate this decision unit that this first coupling signal and this second coupling signal are compared.
15. radio frequency recognition reading device as claimed in claim 14, wherein this comparator circuit this counter of also can resetting.
16. radio frequency recognition reading device as claimed in claim 13, wherein when this detecting device detected a transition, between one second threshold value and one the 3rd threshold value, then this comparator circuit was set as a predetermined value with the count value of this counter as if this count value.
17. radio frequency recognition reading device as claimed in claim 13, wherein when this detecting device detects a transition, if this count value is less than one the 3rd threshold value, then this comparator circuit counting action of this counter of can resetting.
18. radio frequency recognition reading device as claimed in claim 13, wherein if this count value reaches one the 4th threshold value, then this comparator circuit utilizes this controlling signal to indicate this decision unit that this first coupling signal and this second coupling signal are compared, and this counter of resetting.
19. a radio frequency recognition reading device, it includes:
One signal processing module is used for producing one according to the transmission signal that an electric label is transmitted and detects a signal and an input signal, and it is corresponding with the transition of this input signal wherein should to detect signal;
One first matched filter is coupled to this signal processing module, is used for producing one first coupling signal according to this input signal and one first predetermined signal type sample;
One second matched filter is coupled to this signal processing module, is used for producing one second coupling signal according to this input signal and one second predetermined signal type sample;
One control module is coupled to this detection signal, is used for producing a controlling signal; And
One decision unit is coupled to this first, second matched filter and this control module, and it compares this first coupling signal and this second according to this controlling signal and mates signal to produce the signal that reads back.
20. radio frequency recognition reading device as claimed in claim 19, wherein this first predetermined signal type sample is corresponding to data 0 code element in the signal of Miller basis, and this second predetermined signal type sample is corresponding to data 1 code element in the signal of Miller basis.
21. radio frequency recognition reading device as claimed in claim 19, wherein this signal processing module includes:
One analog-to-digital converter is used for converting this transmission signal to a digital signal; And
One detuner is coupled to this analog-to-digital converter, is used for producing this detection signal according to this digital signal, and detects signal according to this and produce Miller basis signal, with as this input signal.
22. radio frequency recognition reading device as claimed in claim 21, wherein this detuner includes:
One Miller basis signal detecting device is used for producing this detection signal according to this digital signal; And
One Miller basis signal reconstructor is coupled to this Miller basis signal detecting device, is used for producing this Miller basis signal according to this detection signal.
23. radio frequency recognition reading device as claimed in claim 22, wherein this Miller basis signal detecting device includes:
One subcarrier generator is used for producing and the corresponding subcarrier signal of this transmission signal;
One first signal comparer is coupled to this subcarrier generator, is used for relatively this digital signal and this subcarrier signal, to produce a signal relatively;
One delay cell is coupled to this first signal comparer, is used for postponing this comparison signal and postpones signal to produce one; And
One second signal comparer is coupled to this first signal comparer and this delay cell, is used for this comparison signal and this delay signal are compared, to produce this detection signal.
24. radio frequency recognition reading device as claimed in claim 23, wherein this Miller basis signal detecting device also includes a noise eliminator, is coupled to this second signal comparer, is used for reducing the noise in this detection signal.
25. radio frequency recognition reading device as claimed in claim 23, wherein this first signal comparer is an XOR or an anteiso-or logic.
26. radio frequency recognition reading device as claimed in claim 23, wherein this second signal comparer comprises an XOR, is used for this comparison signal and this delay signal are carried out an XOR, to produce this detection signal.
27. radio frequency recognition reading device as claimed in claim 22, wherein this Miller basis signal reconstructor is a trigger, and output, its oppisite phase data output terminal that its frequency input end is coupled to this Miller basis signal detecting device are coupled to its noninverting data output end of its data input pin and then are used to provide this Miller basis signal.
28. radio frequency recognition reading device as claimed in claim 19, wherein this control module includes:
One counter is used for counting to export a count value according to a frenquency signal; And
One comparator circuit is coupled to this counter, is used for this count value and at least one threshold value are compared, to determine this controlling signal.
29. radio frequency recognition reading device as claimed in claim 28, wherein when this comparator circuit is triggered by this detection signal, if this count value is greater than one second threshold value, then this comparator circuit utilizes this controlling signal to indicate this decision unit that this first coupling signal and this second coupling signal are compared.
30. radio frequency recognition reading device as claimed in claim 29, wherein this comparator circuit this counter of also resetting.
31. radio frequency recognition reading device as claimed in claim 28, wherein when this comparator circuit was triggered by this detection signal, between one second threshold value and one the 3rd threshold value, then this comparator circuit was set as a predetermined value with the count value of this counter as if this count value.
32. radio frequency recognition reading device as claimed in claim 28, wherein when this comparator circuit is triggered by this detection signal, if this count value is less than one the 3rd threshold value, then this comparator circuit counting action of this counter of resetting.
33. radio frequency recognition reading device as claimed in claim 28, wherein if this count value reaches one the 4th threshold value, then this comparator circuit utilizes this controlling signal to indicate this decision unit that this first coupling signal and this second coupling signal are compared, and this counter of resetting.
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