CN1488118A - Improved identification reader - Google Patents
Improved identification reader Download PDFInfo
- Publication number
- CN1488118A CN1488118A CNA018223230A CN01822323A CN1488118A CN 1488118 A CN1488118 A CN 1488118A CN A018223230 A CNA018223230 A CN A018223230A CN 01822323 A CN01822323 A CN 01822323A CN 1488118 A CN1488118 A CN 1488118A
- Authority
- CN
- China
- Prior art keywords
- reader
- mrfid
- identification
- frequency
- signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10544—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum
- G06K7/10821—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum further details of bar or optical code scanning devices
- G06K7/10851—Circuits for pulse shaping, amplifying, eliminating noise signals, checking the function of the sensing device
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0012—Modulated-carrier systems arrangements for identifying the type of modulation
Abstract
The present invention relates to an identification reader including decoding means capable of decoding signals having differing modulation means.
Description
Technical field
The present invention is relevant with a kind of improved identification (mrfid) reader.
Background technology
This instructions describes use of the present invention with regard to radio frequency (RF) sign (ID) reader.Yet be appreciated that the present invention also can be used for other ID readers.
The RFID reader is well-known in this technical field.Usually, this equipment is used for the situation such as inlet control, animal feeding and animal health, stock's control, process control and/or antitheft/security personnel use.
The operating position of these readers is as follows usually.
Equipment such as transponder is usually by a big alternating magnetic field.This transponder often is rendered as the form of a card.
Transponder extracts energy from this alternating magnetic field, reflect an echoed signal of encoding in a predefined manner, the unique code of a uniqueness that makes reader to detect to have in the transponder.Usually, reader is the equipment that also produces magnetic field.
Adopt some kinds of modulation means, comprised amplitude-shift keying (ASK), frequency shift keying (FSK) and phase-shift keying (PSK) (PSK).In addition, also have some the have different bit time and the forms of bitstream length.These forms cause some different modulation means, require the RFID transponder and are the specially designed reader coupling of given modulation means.
This can cause many problems.
Problem is to occur when hope is upgraded to the system of the different identification (mrfid) reader of the employing of existing inlet control or other types.If wishing to increase has the different modulation means and/or the reader of form in addition, total system must be big moving so, rather than only add some modules.Should see that here can occur changing modulation means usually, because the client wants to change the form of system, and this can cause changing modulation means.
In addition, different modulation means can not guarantee to make existing systems and new system to combine mutually at an easy rate.For example, a modulation means that is used for stock control and another be used to the to enter the mouth modulation means of control can be arranged.These need be with two different ID equipment (such as controller, reader and card) in a physical region.
Overlay configuration is not only uneconomically like this, but also makes the user feel lose heart.
Overlay configuration also relates to must keep many RFID finished products (reader) stockline.This may be uneconomic; Particularly every type must keep sufficient amount to satisfy client's needs.
All lists of references, any patent or the patented claim that comprise in this manual being mentioned are all classified as with reference to being quoted.Do not admit that any list of references constitutes prior art.To the discussion of list of references just quote from they the author declared, the applicant keeps the accuracy of these files that comment quotes and the right of pertinency.Can be clear that though here with reference to the published content of some prior aries, this reference is not to admit that any file in these files is formed on common sense part in this technical field in New Zealand or any other country.
The objective of the invention is at these problems, be at least the public a useful selection is provided.
Other aspects of the present invention and advantage can be clear that from the following explanation that just provides with way of example.
Summary of the invention
According to one aspect of the present invention, a kind of identification (mrfid) reader is provided, this identification (mrfid) reader comprises the decoding device that can decode to the signal with different modulating means.
According to another aspect of the present invention, a kind of decoding device that is included in the identification (mrfid) reader is provided, this decoding device can be decoded to the signal with different modulating means.
This instructions will be a radio frequency identification (mrfid) reader and signal describes for the radio-frequency range signal to identification (mrfid) reader.This should not be regarded as limitation of the present invention.
This decoding device can detect any modulation means that uses at present in the ID system or may use in the future.In a preferred embodiment of the invention, can comprise ASK, FSK and PSK modulation means by decoded modulation means.
Though several each can be combined the reader of a different modulation means decoding, be unpractiaca with regard to expense, size and general easy to use this.
For example, a kind ofly can realize that method of the present invention analyzes input signals (from the transponder reflection) by a plurality of tuned amplifiers, determine coding techniques, analyze various bit rates with a large amount of demodulation hardware, the preamble of more various bit streams is decoded to data again.This needs a large amount of hardware, space, implements very uneconomical.
Yet, in a preferred embodiment of the invention,, but two noticeable changes are arranged with used similar building block in use and the existing reader.
Typical transponder all is used to carrier signal from reader for power supply and clock in this industry.Transponder one obtains power supply, and clock circuit just makes a rolling counters forward by the memory of data that is useful on this equipment containing of it.Then, in some way to the input signal coding, data are sent back to reader with data.All readers all are configured to their distinct response device power supply especially and read, and do not have other.
A building block in these readers is a bandpass amplifier.Usually, frequency band is very narrow, reader configuration become only to read it will receive with the corresponding particular frequency range of modulation means in signal.
Therefore, according to one aspect of the present invention, provide a kind of identification (mrfid) reader that comprises the bandpass filter that frequency spectrum is very wide.In one embodiment, the wave filter carrier wave or the data frequency that can pass through is about 150Hz to 125kHz.This frequency range has covered the scope of typical modulation means, and no matter they are ASK, FSK or PSK modulation.Wave filter can be hardware or software, also can be with or without an amplifier and cooperate.
Amplifier Design becomes because " gain " of coil and the enough low frequency ranges of signal intensity have low gain.Ideally, amplifier has high gain in the inefficient high-frequency of coil.
In typical ID reader, a microprocessor is being arranged, be used for to the bit stream decoding of input and search sync character, making it can the reading of data bit and for the purpose of correct, carry out parity checking or CRC check.If this bit stream is acceptable, microprocessor just sends the data to subscriber computer and further analyzes.
Therefore, microprocessor and uncertain which kind of modulation means have been added on the signal that is received, and it only mates with the modulation means of expecting.
In a preferred embodiment of the invention, dispose an aided decoder, which kind of modulation means what calculating was being used before the sync character of this aided decoder in microprocessor is searched modulation means is.
This aided decoder is the additional operations software in an existing microprocessor of reader just.Perhaps, can this demoder be an independently hardware components also, for example be an additional microprocessor.
In one embodiment, code modulation decoder/detecting device can be worked as described below.
The output of wide-band amplifier can send to demoder, and demoder is just measured the frequency of modulation signal.If frequency is the subharmonic of carrier wave (being generally 125kHz), this transponder perhaps is an effective transponder.
In this table, provided the mode of the modulation scheme of determining that typical existing modulation means is used below.This should not be regarded as restriction, it is contemplated that the modulation means that can develop the other types that some embodiment of the present invention can decode.
| Frequency (f) | Modulation means |
| ????f/2 | ????PSK |
| F/4 f/5 and f/8 | ????PSK?FSK |
| F/5 and f/8 | ????FSK |
| ????f/8 | ????PSK |
| F/8 and f/10 | ????FSK |
| F/16 or f/32 or f/64 | ASK (raw data) |
Microprocessor or demoder only must judgement using is which kind of means in these modulation means, can specified data be Manchester data, differential and double phase data, improvement differential and double phase data or immediate data just.Then, demoder is composed value with 1 or 0 for its, sends to user's computer by any transportation protocol that comprises RS232, RS485 Wiegand and ABA interface.
Can see that owing to use a demoder as above, reading the different multiple signal of modulation scheme only needs few additional building block.Therefore, the present invention's software replace hardware provides a kind of compactness of the signal that can read the different modulating means and economic reader.This makes upgrades or comprehensively some systematic comparisons are easy to existing system, therefore can use some different identification equipments in a physical region.
The present invention also provides needn't move huge stockline, because only need a kind of reader of stock rather than the multiple reader that is respectively applied for the different modulating means.
The reader that in some embodiment of the present invention, can have the form based on market demand need design by the user.For example, user can send into a reader in their the existing reader with some suitable access cards.So the applicant can develop a kind of form that need design by the user, be used for to read the demoder of all modulation means that provide by these cards.
Description of drawings
Other aspects of the present invention can be known from the explanation that just provides with example below in conjunction with accompanying drawing and find out, in these accompanying drawings:
Fig. 1 is the overall block-diagram of a typical recognition system;
Fig. 2 is the overall block-diagram that is modified as the typical recognition system that reads all standard label; And
Fig. 3 is the overall block-diagram of recognition system designed according to this invention.
Embodiment
Fig. 1 shows a typical R FID reader.Crystal oscillator 1 is for microprocessor provides clock, also by frequency divider 2 frequency divisions to the frequency that is generally 125khz.Crystal 1 can be any multiple of supply frequency, is 4.00MHz in this example.Frequency divider 2 becomes 125kHz with its 32 frequency division.This signal drives strong current drive device 3, and strong current drive device 3 is driven antenna coil 4 again.The common peak-to-peak value of voltage at coil 4 two ends from 75 volts to several hectovolts.
The AM detecting device that peak detctor 5 will be carried out the carrier wave that produces on coil 4 detects.The output feed-in multi-stage bandpass amplifier 6 of peak detctor 5 is by its filtering noise and the small-signal that amplifies from coil 4.The amplification of bandpass amplifier 6 and the result of filtering are the signal of a clean expression from the data of transponder.This signal can be that next stage is needed.Next stage 7 is detecting devices that are fit to used modulation means.This detecting device produces a data bit stream, delivers to microprocessor 8.
8 pairs of bit stream decodings that enter of microprocessor are searched sync character, so it can read these data bits, and carry out parity checking or CRC check for the purpose of accurately.If this bit stream is acceptable, microprocessor 8 just sends to user's computer by the interface logic such as RS-232, RS485 or Wiegand 9 with these data and does further to analyze.
Fig. 2 shows a typical designer will do what under the situation of the multiple technologies reader of a reality of needs.Every kind of carrier wave and data protocol will have one independently to be used for the device that amplifies and decode.
This signal drive current driver 12, current driver 12 is driven antenna coil 13 again.The common peak of the voltage at coil 13 two ends one peak value from 75 volts to several hectovolts.
Each peak detctor or wave filter recover to be added in from the signal on the carrier wave of coil 13, and this signal is checked by microprocessor 19 after amplifying.For example, if transponder design becomes to beam back PSK with the supply frequency divided by 2, wave filter/amplifier/14 pairs of signals of phase detectors detect or filtering, amplification and filtering first peak detctor in other words, and phase detectors 14 provide a different output when the signal change phase place.This signal is received by microprocessor 19, is subjected to synchronously and parity checking or CRC (cyclic redundancy check (CRC)) check.
This method is fine, but clumsy and poor efficiency.Every kind of data carrier will have an independently demoder with modulation.If carrier wave be 125kHz (f) divided by 2 (f/2), will be with first channel 14.If carrier wave is f/4, will use second channel 15.If carrier wave is f/8 and f/10, will be with the 3rd channel 16.If echoed signal is f/16, just to the output decoder of the bandpass amplifier of the 4th channel 17, because data are not on carrier wave.Raw data is loaded on the primary power and reader is given in reflection.If echoed signal is f/32 or f/64 shown in last channel 18, situation also is like this.
Fig. 3 shows improvement project of the present invention.Crystal 21 produces vibration, and this vibration makes microprocessor 29 work, also by frequency divider 22 frequency divisions.Resulting signal driving power amplifier 23, power amplifier 23 is driven antenna coil 24 again.Peak detctor 26 has detected signal, and promptly transponder 25 is in the electromagnetic field of coil 24.
The output of peak detctor 26 feed one little and in lower frequency (f/16 or lower) gain at the much bigger broadband bandpass amplifier 27 of higher frequency (up to f/2) gain.The bandpass characteristics of this amplifier is that the compensation antenna is low necessary in higher frequency signal organic efficiency.The result is that antenna/peak detctor/amplifier is combined in the whole frequency range from 100Hz to 70kHz almost smooth response is arranged.
This is with a peak detector (people's " peak detctor of enhancing " (" Enhanced peak detector " such as Carroll, Pat No.5.594.384, on January 14th, 1997)) differentiate ASK with one for being programmed to, the risc microcontroller of FSK and PSK modulation (" utilizing the electronic identification device and the method for a chip microprocessor and an antenna " (" E lectronic Identification Apparatus and MethodUtilizing a Single Chip Microprocessor and an Antenna " of people such as Carroll, September 13,1994)) provide the amplifier with special bandpass characteristics of an input signal to link to each other to fetch realization.This information offers one second risc microcontroller or is used by first microprocessor, will become a bit stream from the signal decoding of label, can offer peripherals to carry out decoding subsequently by RS232, RS485, Wiegand or ABA agreement.
More than just certain situation of the present invention is described, should be appreciated that in the scope of patent protection of the present invention that provides as appended claims and can make various modifications and increase these situations with way of example.
Claims (12)
1. identification (mrfid) reader, comprising can be to the decoding device of signal decoding with different modulating means.
2. identification (mrfid) reader as claimed in claim 1, described identification (mrfid) reader is decoded to the signal of radio-frequency range.
3. identification (mrfid) reader as claimed in claim 1 or 2 can be decoded to two or more modulation means in ASK, FSK and the PSK scheme.
4. as each described identification (mrfid) reader in the claim 1 to 3, comprise a bandpass filter that frequency spectrum is very wide.
5. identification (mrfid) reader as claimed in claim 4, carrier wave or data frequency that wherein said bandpass amplifier can pass through are about 150Hz to 125kHz.
6. as claim 4 or 5 described identification (mrfid) readers, wherein said amplifier has low gain and has high-gain in high-frequency in low frequency.
7. as each described identification (mrfid) reader in the claim 1 to 6, comprise a microprocessor, be used for to the bit stream decoding that enters and search sync character.
8. identification (mrfid) reader as claimed in claim 7 comprises a demoder, and which kind of modulation means is used for calculating before the sync character in microprocessor is searched modulation means what using is.
9. as each described identification (mrfid) reader in the claim 1 to 8, which kind of modulation means what wherein modulation signal was determined to need decoding to the value of the subharmonic of carrier signal is.
10. a decoding device is used for as each the described identification (mrfid) reader in claim 1 to 9.
11. an identification (mrfid) reader is illustrated in conjunction with the accompanying drawings in fact as here and as shown in drawings.
12. a decoding device is illustrated in conjunction with the accompanying drawings in fact as here and as shown in drawings.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US25710200P | 2000-12-22 | 2000-12-22 | |
| US60/257,102 | 2000-12-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1488118A true CN1488118A (en) | 2004-04-07 |
Family
ID=22974894
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA018223230A Pending CN1488118A (en) | 2000-12-22 | 2001-12-12 | Improved identification reader |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP1356416A4 (en) |
| CN (1) | CN1488118A (en) |
| NZ (1) | NZ526638A (en) |
| WO (1) | WO2002052485A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102930237A (en) * | 2012-10-29 | 2013-02-13 | 杭州电子科技大学 | EM4095-based low-frequency card reader device capable of identifying three modulation modes |
| CN102963394A (en) * | 2012-12-10 | 2013-03-13 | 北京交大思诺科技有限公司 | Frequency-division multiplexing capacity-doubled vehicle-mounted receiving device and transponder system |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CZ309664B6 (en) * | 2019-09-03 | 2023-06-28 | Y Soft Corporation, A.S. | Passive chip signal detection device and signal detection method |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2738369A1 (en) * | 1995-09-06 | 1997-03-07 | Philips Electronique Lab | DATA EXCHANGE SYSTEM COMPRISING A PLURALITY OF DATA CARRIERS. |
| US5828693A (en) * | 1996-03-21 | 1998-10-27 | Amtech Corporation | Spread spectrum frequency hopping reader system |
| DE19619246C1 (en) * | 1996-05-13 | 1997-07-10 | Texas Instruments Deutschland | Receiver for transponder signal which has been FSK modulated and which includes check codes |
| JP3568714B2 (en) * | 1996-12-10 | 2004-09-22 | ローム株式会社 | Non-contact communication system and interrogator used therefor |
| US6094173A (en) * | 1997-04-18 | 2000-07-25 | Motorola, Inc. | Method and apparatus for detecting an RFID tag signal |
-
2001
- 2001-12-12 CN CNA018223230A patent/CN1488118A/en active Pending
- 2001-12-12 EP EP01272394A patent/EP1356416A4/en not_active Withdrawn
- 2001-12-12 NZ NZ526638A patent/NZ526638A/en unknown
- 2001-12-12 WO PCT/NZ2001/000279 patent/WO2002052485A1/en not_active Application Discontinuation
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102930237A (en) * | 2012-10-29 | 2013-02-13 | 杭州电子科技大学 | EM4095-based low-frequency card reader device capable of identifying three modulation modes |
| CN102930237B (en) * | 2012-10-29 | 2015-08-12 | 杭州电子科技大学 | The low frequency card reader arrangement of three kinds of modulation systems can be identified based on EM4095 |
| CN102963394A (en) * | 2012-12-10 | 2013-03-13 | 北京交大思诺科技有限公司 | Frequency-division multiplexing capacity-doubled vehicle-mounted receiving device and transponder system |
Also Published As
| Publication number | Publication date |
|---|---|
| NZ526638A (en) | 2004-11-26 |
| WO2002052485A1 (en) | 2002-07-04 |
| EP1356416A4 (en) | 2004-11-24 |
| EP1356416A1 (en) | 2003-10-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7190257B2 (en) | Data encoding in radio frequency identification transponders | |
| US6708881B2 (en) | Reader for a high information capacity SAW identification tag and method of use thereof | |
| US5764774A (en) | Source data compression and decompression in code symbol printing and decoding | |
| CN1047667C (en) | Synchronised electronic identification system | |
| WO2000011592A2 (en) | Radio frequency identification system | |
| EP1550072A2 (en) | Data collision detection device and method | |
| EP0623260A1 (en) | Improved transponder for proximity identification system. | |
| EP0826187B1 (en) | Communication data format | |
| CN100343860C (en) | Method of inventorying transponders by means of a communication station | |
| CN101159025A (en) | RFID tag reader and method | |
| CN1101968C (en) | Method of identifying data carrier | |
| US20020139851A1 (en) | Symbology scanning system for efficiently locating coded symbologies | |
| AU2004228336B2 (en) | A transponder reader capable of reading transponders having different signalling protocols | |
| CN1488118A (en) | Improved identification reader | |
| US20060017544A1 (en) | Method for multi-reading a plurality of id's | |
| CN1605084A (en) | Communication station for inventorizing transponders by means of selectable memory areas of the transponders | |
| US20030090367A1 (en) | Indentification reader | |
| CN1781108A (en) | Authentication of radio frequency transponders | |
| US5866893A (en) | Method and device for reading a bar code | |
| US6889906B1 (en) | Information coding techniques | |
| CN1585959A (en) | Data carrier for transmitting data with different repetition frequencies | |
| CN111400348B (en) | Heterogeneous data processing method of multiple identification coding rules | |
| JP3404887B2 (en) | Barcode reader | |
| NL8602072A (en) | IDENTIFICATION SYSTEM. | |
| CN1703713A (en) | Data collision detection device and method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |