CN202331488U - Magnetic signal preprocessing device and card reader - Google Patents
Magnetic signal preprocessing device and card reader Download PDFInfo
- Publication number
- CN202331488U CN202331488U CN2011204956783U CN201120495678U CN202331488U CN 202331488 U CN202331488 U CN 202331488U CN 2011204956783 U CN2011204956783 U CN 2011204956783U CN 201120495678 U CN201120495678 U CN 201120495678U CN 202331488 U CN202331488 U CN 202331488U
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Abstract
The utility model discloses a magnetic signal preprocessing device, which comprises a filter circuit, a shaping circuit and a phase correction circuit, wherein an output end of the filter circuit is coupled to an input end of the shaping circuit; and the phase correction circuit is arranged at the previous stage of the filter circuit and is used for adjusting phase of a non-zero-cross alternating current signal to get the alternating current signal cross zero. The utility model also discloses a card reader using the magnetic signal preprocessing device. By arranging the phase correction circuit, an irregular magnetic signal read by a magnetic head can be effectively processed into an easily identifiable square wave signal by the magnetic signal preprocessing device; and thus, the problem of signal distortion caused by weak magnesium, biasing, card traveling jitter and the like is solved, and the success rate for signal identification is increased.
Description
Technical field
The utility model relates to a kind of magnetic signal pretreatment unit and card-reading machine.
Background technology
At present, a large amount of banking system ATMs use the magnetic stripe card reader tool, but there is the relatively poor problem of magnetic stripe card decoding performance of weak magnetic and magnetic bias in its magnetic signal decoding IC chip, so properties of product are difficult to reach the requirement of high-end card-reading machine.
The utility model content
The fundamental purpose of the utility model is exactly the deficiency to prior art; A kind of magnetic signal pretreatment unit is provided and adopts the card-reading machine of this device; Can the irregular magnetic signal that magnetic head is read effectively be processed into the square-wave signal that is prone to identification; Solve the distorted signals that causes owing to weak magnetic, magnetic bias, card advance shake etc., improve the success ratio of signal identification.
For realizing above-mentioned purpose, the utility model adopts following technical scheme:
A kind of magnetic signal pretreatment unit; Comprise filtering circuit and shaping circuit; The output terminal of said filtering circuit is coupled to the input end of said shaping circuit; Also comprise the strong circuitry phase that is arranged at said filtering circuit prime, said strong circuitry phase is used to adjust the phase place of the AC signal of zero passage not so that the AC signal zero crossing point.
Preferably, also comprise the amplifying circuit that is arranged at said filtering circuit prime.
More preferably; Said strong circuitry phase comprises first electric capacity, first resistance and the 3rd resistance; Said amplifying circuit comprises first operational amplifier and second resistance; One end of said first electric capacity and said the 3rd resistance is with an end that connects the card-reading machine magnetic head coil; The in-phase input end of said first operational amplifier of another termination of said first electric capacity and an end of said first resistance; Another termination reference voltage of said first resistance and the other end of card-reading machine magnetic head coil, the inverting input of said first operational amplifier of another termination of said the 3rd resistance, the inverting input of said first operational amplifier connect the output terminal of said first operational amplifier through said second resistance.
Preferably, said filtering circuit is a BPF..
Preferably, said shaping circuit is the schmidt shaping circuit that is used for the threshold value shaping.
Preferably, said magnetic signal pretreatment unit comprises the said strong circuitry phase of multichannel, said filtering circuit and said shaping circuit, the respectively corresponding magnetic track to be read in each road.
A kind of card-reading machine; Comprise signal processing unit and magnetic head; Also comprise foregoing any magnetic signal pretreatment unit, the said magnetic head of input termination of said magnetic signal pretreatment unit, the said signal processing unit of output termination of said magnetic signal pretreatment unit.
The utility model beneficial technical effects is:
The magnetic signal pretreatment unit of the utility model comprises the strong circuitry phase that is arranged at the filtering circuit prime; The phase place that this strong circuitry phase can be adjusted only zero AC signal is so that the AC signal zero crossing point; Thereby can the irregular magnetic signal that magnetic head is read effectively be processed into the square-wave signal that is prone to identification; Solve the distorted signals that causes owing to weak magnetic, magnetic bias, card advance shake etc., improve the success ratio of signal identification.Adopt the card-reading machine of this magnetic signal pretreatment unit to have good Card Reader performance, strengthened the reliability of Card Reader and the ease for use of card-reading machine.
Description of drawings
Fig. 1 is the magnetic signal pretreatment unit structured flowchart according to an embodiment of the utility model;
Fig. 2 is according to the magnetic signal pre-service synoptic diagram among embodiment of the utility model;
Fig. 3 representes according to amplifying circuit and strong circuitry phase among embodiment of the utility model;
Fig. 4 representes according to the bandwidth-limited circuit among embodiment of the utility model;
Fig. 5 representes according to the threshold value shaping circuit among embodiment of the utility model.
Embodiment
Below combine accompanying drawing that the utility model is further specified through embodiment.
Referring to Fig. 1; The magnetic signal pretreatment unit of an embodiment comprises rectifys circuitry phase 100, filtering circuit 200, shaping circuit 300; Rectify the prime that circuitry phase 100 is arranged at said filtering circuit 200; Said strong circuitry phase 100 is used to adjust the phase place of the AC signal of zero passage not so that the AC signal zero crossing point, and the output terminal of said filtering circuit 200 is coupled to the input end of said shaping circuit.300 pairs of filtered signals of shaping circuit carry out the magnetic recording signal of shaping and output reduction.
In preferred embodiment, the magnetic signal pretreatment unit also comprises the amplifying circuit that is arranged at said filtering circuit prime.Referring to Fig. 2, the weak electric signal of magnetic head output at first input signal amplifies and phase correction through signal, has more consistent amplitude and alternating current zero crossing characteristic through amplifying with the signal of strong phase; Signal is imported filtering more then, the filtering clutter; Filtered signal is passed to shaping circuit, is square wave with signal shaping, and the width of square wave has the characteristic that characterizes the magnetic recording data parameters.
Strong circuitry phase can not rely on amplifying circuit and is provided with separately.Whether the magnetic signal pretreatment unit carries out signal is amplified and can decide according to the amplitude of input signal.What in general magnetic head was read all is weak signal, just can continue to handle after needing under this situation to amplify.In certain embodiments, the signal that has distortion that magnetic head is read is passed to amplification and strong circuitry phase earlier, to weak signal certain gain is provided by amplifying element, with rectifying circuitry phase the not phase deviation of the AC signal of zero passage, lets it pass through zero point simultaneously.In some embodiment, signals reverse is input to operational amplifier, can make the phase place of signal leading through for example increasing the in-phase input end of CR (electric capacity-resistance, similar differentiating circuit) accelerating circuit at amplifier, reaches the purpose of rectifying phase.
Referring to Fig. 3; In preferred embodiment; Said strong circuitry phase comprises first capacitor C 1, first resistance R 1 and the 3rd resistance R 3; Said amplifying circuit comprises the first operational amplifier U1A and second resistance R 2; One end of said first electric capacity and said the 3rd resistance connects the end of card-reading machine magnetic head coil L1 together, the in-phase input end 3 of said first operational amplifier of another termination of said first electric capacity and an end of said first resistance, another termination reference voltage VREF of said first resistance and the other end of card-reading machine magnetic head coil L1; The inverting input 2 of said first operational amplifier of another termination of said the 3rd resistance, the inverting input of said first operational amplifier connect the output terminal 1 of said first operational amplifier through said second resistance.1/2 of the common desirable amplifier supply voltage of reference voltage VREF.First capacitor C 1, first resistance R 1 have increased an input channel for magnetic signal at the in-phase input end of operational amplifier, and this CR circuit has the leading effect of the phase place of making, and reaches the purpose of rectifying phase.Second resistance R 2 on the feedback network can be adjusted to change gain amplifier.
In preferred embodiment, filtering circuit can be a bandwidth-limited circuit for example as shown in Figure 4.BPF. will suppress with outer clutter, and filtering is to let useful signal TF pass through.Referring to Fig. 4, amplifier U1B and peripheral circuit are formed BPF., can change bandwidth and Frequency point through the value of adjusting second capacitor C 2, resistance R 4, R5, the 3rd capacitor C 3.
In preferred embodiment, shaping circuit can be the circuit that carries out the threshold value shaping, schmidt shaping circuit for example as shown in Figure 5.The threshold value shaping circuit of signal through having Schmidt's characteristic, shaping becomes square wave.Referring to Fig. 5, amplifier U2B and peripheral circuit are formed schmidt shaping circuit, and the ratio of regulating resistance R 8 and R7 can change threshold size, and ratio increases, and threshold value reduces.Voltage when said threshold value refers to the signal upset and the difference of reference voltage V REF, the signal that is lower than threshold value changes the action that can not cause shaping circuit, appropriate threshold voltage is set can effectively masks noise by a small margin.
Because standard magnetic card commonly used has three magnetic tracks, be used to write down and export different data, read when card-reading apparatus also should be supported three track data like this, so the magnetic head that card-reading machine is selected for use should be three rails.The circuit of the magnetic signal pretreatment unit of previous embodiment can carry out pre-service to a track data, on its basis, more multichannel interlock circuit can be set in the magnetic signal pretreatment unit, and same configuration can be used in each road.Therefore, in some embodiment, said magnetic signal pretreatment unit comprises three tunnel said strong circuitry phases, said filtering circuit and said shaping circuit, and each road is equivalent to parallel connection setting, the corresponding magnetic track to be read in each road.For example, when three tunnel strong circuitry phase was exported three road TP signals respectively, each TP outputed to corresponding filtering circuit and shaping circuit.
Above content is the further explain that combines concrete preferred implementation that the utility model is done, and can not assert that the practical implementation of the utility model is confined to these explanations.For the those of ordinary skill of technical field under the utility model, under the prerequisite that does not break away from the utility model design, can also make some simple deduction or replace, all should be regarded as belonging to the protection domain of the utility model.
Claims (7)
1. magnetic signal pretreatment unit; Comprise filtering circuit and shaping circuit; The output terminal of said filtering circuit is coupled to the input end of said shaping circuit; It is characterized in that, also comprise the strong circuitry phase that is arranged at said filtering circuit prime, said strong circuitry phase is used to adjust the phase place of the AC signal of zero passage not so that the AC signal zero crossing point.
2. magnetic signal pretreatment unit as claimed in claim 1 is characterized in that, also comprises the amplifying circuit that is arranged at said filtering circuit prime.
3. magnetic signal pretreatment unit as claimed in claim 2; It is characterized in that; Said strong circuitry phase comprises first electric capacity, first resistance and the 3rd resistance; Said amplifying circuit comprises first operational amplifier and second resistance; One end of said first electric capacity and said the 3rd resistance is with an end that connects the card-reading machine magnetic head coil, the in-phase input end of said first operational amplifier of another termination of said first electric capacity and an end of said first resistance, another termination reference voltage of said first resistance and the other end of card-reading machine magnetic head coil; The inverting input of said first operational amplifier of another termination of said the 3rd resistance, the inverting input of said first operational amplifier connect the output terminal of said first operational amplifier through said second resistance.
4. magnetic signal pretreatment unit as claimed in claim 1 is characterized in that, said filtering circuit is a BPF..
5. magnetic signal pretreatment unit as claimed in claim 1 is characterized in that, said shaping circuit is the schmidt shaping circuit that is used for the threshold value shaping.
6. like each described magnetic signal pretreatment unit of claim 1 to 5, it is characterized in that, comprise the said strong circuitry phase of multichannel, said filtering circuit and said shaping circuit, the respectively corresponding magnetic track to be read in each road.
7. card-reading machine; Comprise signal processing unit and magnetic head; It is characterized in that; Also comprise like each described magnetic signal pretreatment unit of claim 1 to 6, the said magnetic head of input termination of said magnetic signal pretreatment unit, the said signal processing unit of output termination of said magnetic signal pretreatment unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204956783U CN202331488U (en) | 2011-12-02 | 2011-12-02 | Magnetic signal preprocessing device and card reader |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204956783U CN202331488U (en) | 2011-12-02 | 2011-12-02 | Magnetic signal preprocessing device and card reader |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202331488U true CN202331488U (en) | 2012-07-11 |
Family
ID=46443460
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204956783U Expired - Lifetime CN202331488U (en) | 2011-12-02 | 2011-12-02 | Magnetic signal preprocessing device and card reader |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202331488U (en) |
-
2011
- 2011-12-02 CN CN2011204956783U patent/CN202331488U/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 518057, Guangdong, Nanshan District science and Technology Park, Shenzhen District North Wing Road two, aerospace micro motor building research building on the south side of the 4 floor Patentee after: SHENZHEN MINGTE TECH CO., LTD. Address before: 518057, Guangdong, Nanshan District science and Technology Park, Shenzhen District North Wing Road two, aerospace micro motor building research building on the south side of the 4 floor Patentee before: Shenzhen Mingte Technology Co., Ltd. |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 518057, Guangdong, Nanshan District science and Technology Park, Shenzhen District North Wing Road two, aerospace micro motor building research building on the south side of the 4 floor Patentee after: Shenzhen Mingte Technology Co., Ltd. Address before: 518057, Guangdong, Nanshan District science and Technology Park, Shenzhen District North Wing Road two, aerospace micro motor building research building on the south side of the 4 floor Patentee before: SHENZHEN MINGTE TECH CO., LTD. |
|
| CP01 | Change in the name or title of a patent holder | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120711 |
|
| CX01 | Expiry of patent term |