CN105427438A - Novel fingerprint identification access control system based on signal pre-processing circuit - Google Patents
Novel fingerprint identification access control system based on signal pre-processing circuit Download PDFInfo
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- CN105427438A CN105427438A CN201510964873.9A CN201510964873A CN105427438A CN 105427438 A CN105427438 A CN 105427438A CN 201510964873 A CN201510964873 A CN 201510964873A CN 105427438 A CN105427438 A CN 105427438A
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C9/00—Individual registration on entry or exit
- G07C9/30—Individual registration on entry or exit not involving the use of a pass
- G07C9/32—Individual registration on entry or exit not involving the use of a pass in combination with an identity check
- G07C9/37—Individual registration on entry or exit not involving the use of a pass in combination with an identity check using biometric data, e.g. fingerprints, iris scans or voice recognition
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Abstract
The invention discloses a novel fingerprint identification access control system based on a signal pre-processing circuit. The novel fingerprint identification access control system is mainly composed of a central processing unit, a second wireless transmission module, and a power supply input circuit, an alarm, a display, a memory, a low-distortion oscillating circuit, a clock, a triggering circuit and an A/D (Analogue/Digital) conversion circuit which are connected with the central processing unit respectively, a fingerprint acquisition module connected with the A/D conversion circuit, an electromagnetic lock connected with the triggering circuit, a first wireless transmission module connected with the low-distortion oscillating circuit and the like. A door can be opened through identifying fingerprints of people who are kept out of the door, so that the safety and stability of access control management are improved. Meanwhile, compared with a traditional lockset, the novel fingerprint identification access control system does not need to be opened by a key, so that the utilization is more convenient. The novel fingerprint identification access control system is provided with the signal pre-processing circuit and the signal pre-processing circuit can be used for carrying out amplification processing on a fingerprint image signal acquired by the fingerprint acquisition module so that the fingerprint image signal is clearer and the identification precision of the system is improved.
Description
Technical field
The present invention relates to a kind of gate control system, specifically refer to a kind of novel finger print identification gate control system based on signal pre-processing circuit.
Background technology
Along with developing rapidly of electronic information technology, conventional door lock is constantly to high-tech, intelligent direction development, progress in the life of people with the intelligent identifying system of living things feature recognition in conjunction with conventional lock, wherein this intelligent identifying system is applied to entrance guard management and attendance management by increasing enterprise, as IC-card recognition system, but in actual practicality, the safety and stability of IC-card identification can not well be ensured, such as IC-card is easy to lose or used, and these labile factors all can make system there is certain potential safety hazard.
Summary of the invention
The object of the invention is to overcome the not high defect of existing gate control system safety and stability, a kind of novel finger print identification gate control system based on signal pre-processing circuit is provided.
Object of the present invention is achieved through the following technical solutions: a kind of novel finger print identification gate control system based on signal pre-processing circuit, primarily of central processing unit, second wireless transport module, the power supply input circuit be connected with central processing unit respectively, alarm, display, storer, low distortion oscillatory circuit, clock, trigger circuit and A/D change-over circuit, the finger print acquisition module be connected with A/D change-over circuit, the electromagnetic lock be connected with trigger circuit, the first wireless transport module be connected with low distortion oscillatory circuit, and the PC to be connected with the second wireless transport module forms, described first wireless transport module is connected with the second wireless transport module by wireless network, in order to better implement the present invention, the present invention is also serially connected with signal pre-processing circuit between finger print acquisition module and A/D change-over circuit.
Further, described signal pre-processing circuit is by amplifier P6, amplifier P7, amplifier P8, field effect transistor MOS3, triode VT2, be serially connected in the resistance R9 between the positive pole of amplifier P6 and output terminal, negative pole is connected with the negative pole of amplifier P6, positive pole then forms the electric capacity C4 of the input end of this signal pre-processing circuit, be serially connected in the resistance R12 between the output terminal of amplifier P6 and the negative pole of amplifier P8, be serially connected in the resistance R11 between the grid of field effect transistor MOS3 and the base stage of triode VT2, N pole is connected with the collector of triode VT2, the diode D4 that P pole is then connected with the output terminal of amplifier P7 after resistance R10, positive pole is connected with the positive pole of amplifier P8, the electric capacity C5 that negative pole is then connected with the N pole of diode D4, and N pole is connected with the output terminal of amplifier P8, the diode D5 that P pole is then connected with the emitter of triode VT2 forms, the drain electrode of described field effect transistor MOS3 is connected with the output terminal of amplifier P6, and its source electrode is then connected with the output terminal of amplifier P7, the negative pole of described amplifier P7 is connected with its output terminal, the grounded collector of described triode VT2, the output terminal of described amplifier P8 then forms the output terminal of this signal pre-processing circuit and is connected with the input end of A/D change-over circuit, the input end of described signal pre-processing circuit is then connected with finger print acquisition module.
Described low distortion oscillatory circuit by amplifying circuit, the negative-feedback circuit be connected with amplifying circuit, and be both the oscillatory circuit be connected with negative-feedback circuit with amplifying circuit and form; The input end of described amplifying circuit is connected with central processing unit, and the output terminal of oscillatory circuit is then connected with the first wireless transport module.
Described amplifying circuit is by amplifier P1, amplifier P2, triode VT1, be serially connected in the resistance R2 between the positive pole of amplifier P1 and output terminal, the resistance R1 that one end is connected with the negative pole of amplifier P1, the other end is then connected with negative-feedback circuit, be serially connected in the resistance R4 between the output terminal of amplifier P1 and the positive pole of amplifier P2, the electric capacity C1 that positive pole is connected with the positive pole of amplifier P2, negative pole is then connected with the output terminal of amplifier P2, and the resistance R5 be serially connected between the output terminal of amplifier P2 and the emitter of triode VT1 forms; The negative pole of described amplifier P1 forms the input end of this amplifying circuit, and its output terminal is then connected with the output terminal of amplifier P2; The minus earth of described amplifier P2, its output terminal is then connected with negative-feedback circuit; The base stage of described triode VT1 is connected with the output terminal of amplifier P1, and its collector is then connected with negative-feedback circuit, and its emitter is then connected with oscillatory circuit.
Described negative-feedback circuit is by field effect transistor MOS1, amplifier P3, amplifier P4, the diode D1 that N pole is connected with the output terminal of amplifier P4, P pole is then connected with the output terminal of amplifier P3 after resistance R3, the electric capacity C2 that positive pole is connected with the grid of field effect transistor MOS1, negative pole is then connected with the N pole of diode D1, the diode D2 that N pole is connected with the collector of triode VT1, P pole is then connected with the positive pole of amplifier P4 forms; The drain electrode of described field effect transistor MOS1 is connected with the output terminal of amplifier P2, its source ground; The described positive pole of amplifier P3 is connected with the drain electrode of field effect transistor MOS1, and its negative pole is then connected with its output terminal; The P pole of described diode D1 is connected with the negative pole of amplifier P1 after resistance R1; The minus earth of described amplifier P4; The N pole of described diode D2 is also connected with oscillatory circuit.
Described oscillatory circuit is by the chip U1 that vibrates, amplifier P5, field effect transistor MOS2, be serially connected in the inductance L 1 between the VDD pin of vibration chip U1 and the drain electrode of field effect transistor MOS2, be serially connected in the resistance R6 between the positive pole of amplifier P5 and output terminal, positive pole after resistance R7 with the electric capacity C3 that COMP pin is connected, negative pole is then connected with the source electrode of field effect transistor MOS2 of vibration chip U1, and the diode D3 that N pole is connected with the drain electrode of field effect transistor MOS2, P pole is then connected with the FB pin of the chip U1 that vibrates after resistance R8 forms; The positive pole of described amplifier P5 is connected with the N pole of diode D2, its minus earth, and its output terminal is then connected with the EN pin of vibration chip U1; The VDD pin of described vibration chip U1 connects 12V voltage, and its TOFF pin is then connected with the emitter of triode VT1, its VSS pin ground connection, and its CS pin is then connected with the source electrode of field effect transistor MOS2, and its DRV pin is connected with the grid of field effect transistor MOS2; The P pole of described diode D3 then forms the output terminal of this oscillatory circuit.
Described vibration chip U1 is UCT4392 type integrated chip.
The present invention comparatively prior art compares, and has the following advantages and beneficial effect:
(1) the present invention is by opening gate inhibition to needing to carry out identification by the fingerprint of gate inhibition personnel, improves the safety and stability of entrance guard management.Meanwhile, the present invention does not need key need be used to open as traditional lockset, uses convenient.
(2) the present invention adopts wireless mode to carry out data transmission, realizes the message exchange of access control and PC, decreases difficulty of construction, be beneficial in the future supvr to the transformation of gate inhibition's network.
(3) the present invention is provided with signal pre-processing circuit, and the fingerprint image signal that this signal pre-processing circuit can collect finger print acquisition module carries out amplification process, thus fingerprint image signal can be made more clear, improves accuracy of identification of the present invention.
Accompanying drawing explanation
Fig. 1 is one-piece construction block diagram of the present invention.
Fig. 2 is the structural drawing of low distortion oscillatory circuit of the present invention.
Fig. 3 is the structural drawing of signal pre-processing circuit of the present invention.
Embodiment
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited to this.
Embodiment
As shown in Figure 1, a kind of novel finger print identification gate control system based on signal pre-processing circuit of the present invention, primarily of central processing unit, second wireless transport module, the power supply input circuit be connected with central processing unit respectively, alarm, display, storer, low distortion oscillatory circuit, clock, trigger circuit and signal pre-processing circuit, the A/D change-over circuit be connected with signal pre-processing circuit, the finger print acquisition module be connected with A/D change-over circuit, the electromagnetic lock be connected with trigger circuit, the first wireless transport module be connected with low distortion oscillatory circuit, and the PC to be connected with the second wireless transport module forms, described first wireless transport module is connected with the second wireless transport module by wireless network.
This finger print acquisition module is arranged near gate inhibition, need by the information in fingerprint of gate inhibition personnel for gathering, and it preferentially adopts Shenzhen City Yalvete Biometric Identification Technology Co., Ltd ARA-EM02-1011 fingerprint identification module.The fingerprint image signal that this signal pre-processing circuit can collect finger print acquisition module carries out amplification process, thus fingerprint image signal can be made more clear.A/D change-over circuit is used for that the simulating signal that signal pre-processing circuit exports is converted to electric signal and exports to central processing unit.This central processing unit is for controlling the running of whole system, and its SPCE061A single-chip microcomputer preferentially adopting Taiwan Ling Yang company to produce realizes.Power supply input circuit is used for providing working power to central processing unit.Storer is then for storing the finger print information that can pass in and out gate inhibition personnel in advance; Alarm adopts traditional hummer, for sounding the alarm when finger print information coupling is unsuccessful.Display is then for simultaneous display recognition result.Trigger circuit are then for controlling the work of electromagnetic lock; Clock is then for displaying time.Low distortion oscillatory circuit is used for the signal of PC need be sent to process.First wireless transport module and the second wireless transport module are used for carrying out wireless transmission to signal, and the preferential PTR2000 type wireless transport module that adopts realizes.This PC is then for storing signal.
The IOA2 pin of this SPCE061A type single-chip microcomputer is connected with the output terminal of A/D change-over circuit, its IOA1 pin is then connected with the input end of trigger circuit, its IOA6 pin is then connected with storer, its IOA5 pin is then connected with display, its DAC1 pin is then connected with alarm, its IOA3 pin is then connected with low distortion oscillatory circuit, and its IOA4 pin is then connected with clock, and its VDD pin is then connected with power supply.The DI pin of described second wireless transport module is then connected with PC, and the DI pin of the first wireless transport module is then connected with low distortion oscillatory circuit.Described A/D change-over circuit, trigger circuit, storer, PC and power supply input circuit all adopt prior art to realize.
As shown in Figure 2, described low distortion oscillatory circuit by amplifying circuit, the negative-feedback circuit be connected with amplifying circuit, and be both the oscillatory circuit be connected with negative-feedback circuit with amplifying circuit and form; The input end of described amplifying circuit is connected with the IOA3 pin of SPCE061A type single-chip microcomputer, and the output terminal of oscillatory circuit is then connected with the DI pin of the first wireless transport module.
Described amplifying circuit is by amplifier P1, and amplifier P2, triode VT1, resistance R1, resistance R2, resistance R4, resistance R5 and electric capacity C1 form.
During connection, between the positive pole that resistance R2 is serially connected in amplifier P1 and output terminal.One end of resistance R1 is connected with the negative pole of amplifier P1, its other end is then connected with negative-feedback circuit.Resistance R4 is serially connected between the output terminal of amplifier P1 and the positive pole of amplifier P2.The positive pole of electric capacity C1 is connected with the positive pole of amplifier P2, its negative pole is then connected with the output terminal of amplifier P2.Resistance R5 is serially connected between the output terminal of amplifier P2 and the emitter of triode VT1.
Meanwhile, the negative pole of described amplifier P1 forms the input end of this amplifying circuit, and its output terminal is then connected with the output terminal of amplifier P2.The minus earth of described amplifier P2, its output terminal is then connected with negative-feedback circuit.The base stage of described triode VT1 is connected with the output terminal of amplifier P1, and its collector is then connected with negative-feedback circuit, and its emitter is then connected with oscillatory circuit.The signal that this amplifying circuit can export central processing unit carries out amplification process.
In addition, described negative-feedback circuit is by field effect transistor MOS1, amplifier P3, amplifier P4, the diode D1 that N pole is connected with the output terminal of amplifier P4, P pole is then connected with the output terminal of amplifier P3 after resistance R3, the electric capacity C2 that positive pole is connected with the grid of field effect transistor MOS1, negative pole is then connected with the N pole of diode D1, the diode D2 that N pole is connected with the collector of triode VT1, P pole is then connected with the positive pole of amplifier P4 forms.
The drain electrode of this field effect transistor MOS1 is connected with the output terminal of amplifier P2, its source ground.The described positive pole of amplifier P3 is connected with the drain electrode of field effect transistor MOS1, and its negative pole is then connected with its output terminal.The P pole of described diode D1 is connected with the negative pole of amplifier P1 after resistance R1.The minus earth of described amplifier P4.The N pole of described diode D2 is also connected with oscillatory circuit.
This feedback circuit processes the input end that the signal that amplifying circuit exports feeds back to amplifying circuit again again by amplifying circuit, thus guarantees that the multiple that all signals amplify is identical, improves the stability of amplifying circuit output signal.
Described oscillatory circuit is by the chip U1 that vibrates, and amplifier P5, field effect transistor MOS2, resistance R6, resistance R7, resistance R8, inductance L 1, electric capacity C3 and diode D3 forms.
Wherein, between the inductance L 1 VDD pin that is serially connected in vibration chip U1 and the drain electrode of field effect transistor MOS2.Between the positive pole that resistance R6 is serially connected in amplifier P5 and output terminal.The positive pole of electric capacity C3 is connected with the COMP pin of vibration chip U1 after resistance R7, its negative pole is then connected with the source electrode of field effect transistor MOS2.The N pole of diode D3 is connected with the drain electrode of field effect transistor MOS2, its P pole is then connected with the FB pin of vibration chip U1 after resistance R8.
The positive pole of this amplifier P5 is connected with the N pole of diode D2, its minus earth, and its output terminal is then connected with the EN pin of vibration chip U1.The VDD pin of described vibration chip U1 connects 12V voltage, and its TOFF pin is then connected with the emitter of triode VT1, its VSS pin ground connection, and its CS pin is then connected with the source electrode of field effect transistor MOS2, and its DRV pin is connected with the grid of field effect transistor MOS2.The P pole of described diode D3 then forms the output terminal of this oscillatory circuit.
The signal of this oscillatory circuit to input carries out modulation treatment, and Signal transmissions after treatment gives the first wireless transport module, enables the first wireless transport module better carry out long-distance transmissions to signal.In order to reach better implementation result, described vibration chip U1 is preferably UCT4392 type integrated chip and realizes.
As shown in Figure 3, described signal pre-processing circuit is by amplifier P6, and amplifier P7, amplifier P8, field effect transistor MOS3, triode VT2, resistance R9, resistance R10, resistance R11, resistance R12, electric capacity C4, electric capacity C5, diode D4 and diode D5 form.
Wherein, between the resistance R9 positive pole that is serially connected in amplifier P6 and output terminal.The negative pole of electric capacity C4 is connected with the negative pole of amplifier P6, its positive pole then forms the input end of this signal pre-processing circuit and is connected with finger print acquisition module.Resistance R12 is serially connected between the output terminal of amplifier P6 and the negative pole of amplifier P8.Resistance R11 is serially connected between the grid of field effect transistor MOS3 and the base stage of triode VT2.The N pole of diode D4 is connected with the collector of triode VT2, its P pole is then connected with the output terminal of amplifier P7 after resistance R10.The positive pole of electric capacity C5 is connected with the positive pole of amplifier P8, its negative pole is then connected with the N pole of diode D4.The N pole of diode D5 is connected with the output terminal of amplifier P8, its P pole is then connected with the emitter of triode VT2.
The drain electrode of described field effect transistor MOS3 is connected with the output terminal of amplifier P6, and its source electrode is then connected with the output terminal of amplifier P7.The negative pole of described amplifier P7 is connected with its output terminal.The grounded collector of described triode VT2.The output terminal of described amplifier P8 then forms the output terminal of this signal pre-processing circuit and is connected with the input end of A/D change-over circuit.
The fingerprint image signal that this signal pre-processing circuit can collect finger print acquisition module carries out amplification process, thus fingerprint image signal can be made more clear, improves accuracy of identification of the present invention.
During work, need by gate inhibition personnel's finger be placed on finger print acquisition module, this finger print acquisition module then gathers the information in fingerprint of these personnel and sends to signal pre-processing circuit, and signal pre-processing circuit sends to A/D change-over circuit after processing fingerprint image signal.This A/D change-over circuit sends to central processing unit after information in fingerprint is converted to electric signal, this central processing unit mates the signal of input with the fingerprint signal stored in advance in storer, if it fails to match, central processing unit then sends command signal and makes alarm equipment alarm to alarm.If the match is successful, central processing unit then sends command signal to trigger circuit, and these trigger circuit then control electromagnetic lock and open.The matching result of this display module then simultaneous display fingerprint signal.Simultaneously, central processing unit also sends to low distortion oscillatory circuit the finger print information collected, fingerprint collecting temporal information, the first wireless transport module is sent to after this low distortion oscillatory circuit processes signal, this first wireless transport module sends to the second wireless transport module by wireless network signal, and the second wireless transport module sends to PC to store signal.
As mentioned above, just well the present invention can be implemented.
Claims (7)
1. the novel finger print identification gate control system based on signal pre-processing circuit, primarily of central processing unit, second wireless transport module, the power supply input circuit be connected with central processing unit respectively, alarm, display, storer, low distortion oscillatory circuit, clock, trigger circuit and A/D change-over circuit, the finger print acquisition module be connected with A/D change-over circuit, the electromagnetic lock be connected with trigger circuit, the first wireless transport module be connected with low distortion oscillatory circuit, and the PC be connected with the second wireless transport module forms; Described first wireless transport module is connected with the second wireless transport module by wireless network; It is characterized in that, between finger print acquisition module and A/D change-over circuit, be also serially connected with signal pre-processing circuit.
2. a kind of novel finger print identification gate control system based on signal pre-processing circuit according to claim 1, it is characterized in that: described signal pre-processing circuit is by amplifier P6, amplifier P7, amplifier P8, field effect transistor MOS3, triode VT2, be serially connected in the resistance R9 between the positive pole of amplifier P6 and output terminal, negative pole is connected with the negative pole of amplifier P6, positive pole then forms the electric capacity C4 of the input end of this signal pre-processing circuit, be serially connected in the resistance R12 between the output terminal of amplifier P6 and the negative pole of amplifier P8, be serially connected in the resistance R11 between the grid of field effect transistor MOS3 and the base stage of triode VT2, N pole is connected with the collector of triode VT2, the diode D4 that P pole is then connected with the output terminal of amplifier P7 after resistance R10, positive pole is connected with the positive pole of amplifier P8, the electric capacity C5 that negative pole is then connected with the N pole of diode D4, and N pole is connected with the output terminal of amplifier P8, the diode D5 that P pole is then connected with the emitter of triode VT2 forms, the drain electrode of described field effect transistor MOS3 is connected with the output terminal of amplifier P6, and its source electrode is then connected with the output terminal of amplifier P7, the negative pole of described amplifier P7 is connected with its output terminal, the grounded collector of described triode VT2, the output terminal of described amplifier P8 then forms the output terminal of this signal pre-processing circuit and is connected with the input end of A/D change-over circuit, the input end of described signal pre-processing circuit is then connected with finger print acquisition module.
3. a kind of novel finger print identification gate control system based on signal pre-processing circuit according to claim 2, it is characterized in that: described low distortion oscillatory circuit is by amplifying circuit, the negative-feedback circuit be connected with amplifying circuit, and be both the oscillatory circuit be connected with negative-feedback circuit with amplifying circuit and form; The input end of described amplifying circuit is connected with central processing unit, and the output terminal of oscillatory circuit is then connected with the first wireless transport module.
4. a kind of novel finger print identification gate control system based on signal pre-processing circuit according to claim 3, it is characterized in that: described amplifying circuit is by amplifier P1, amplifier P2, triode VT1, be serially connected in the resistance R2 between the positive pole of amplifier P1 and output terminal, one end is connected with the negative pole of amplifier P1, the resistance R1 that the other end is then connected with negative-feedback circuit, be serially connected in the resistance R4 between the output terminal of amplifier P1 and the positive pole of amplifier P2, positive pole is connected with the positive pole of amplifier P2, the electric capacity C1 that negative pole is then connected with the output terminal of amplifier P2, and the resistance R5 be serially connected between the output terminal of amplifier P2 and the emitter of triode VT1 forms, the negative pole of described amplifier P1 forms the input end of this amplifying circuit, and its output terminal is then connected with the output terminal of amplifier P2, the minus earth of described amplifier P2, its output terminal is then connected with negative-feedback circuit, the base stage of described triode VT1 is connected with the output terminal of amplifier P1, and its collector is then connected with negative-feedback circuit, and its emitter is then connected with oscillatory circuit.
5. a kind of novel finger print identification gate control system based on signal pre-processing circuit according to claim 4, it is characterized in that: described negative-feedback circuit is by field effect transistor MOS1, amplifier P3, amplifier P4, N pole is connected with the output terminal of amplifier P4, the diode D1 that P pole is then connected with the output terminal of amplifier P3 after resistance R3, positive pole is connected with the grid of field effect transistor MOS1, the electric capacity C2 that negative pole is then connected with the N pole of diode D1, N pole is connected with the collector of triode VT1, the diode D2 that P pole is then connected with the positive pole of amplifier P4 forms, the drain electrode of described field effect transistor MOS1 is connected with the output terminal of amplifier P2, its source ground, the described positive pole of amplifier P3 is connected with the drain electrode of field effect transistor MOS1, and its negative pole is then connected with its output terminal, the P pole of described diode D1 is connected with the negative pole of amplifier P1 after resistance R1, the minus earth of described amplifier P4, the N pole of described diode D2 is also connected with oscillatory circuit.
6. a kind of novel finger print identification gate control system based on signal pre-processing circuit according to claim 5, it is characterized in that: described oscillatory circuit is by the chip U1 that vibrates, amplifier P5, field effect transistor MOS2, be serially connected in the inductance L 1 between the VDD pin of vibration chip U1 and the drain electrode of field effect transistor MOS2, be serially connected in the resistance R6 between the positive pole of amplifier P5 and output terminal, positive pole is connected with the COMP pin of vibration chip U1 after resistance R7, the electric capacity C3 that negative pole is then connected with the source electrode of field effect transistor MOS2, and N pole is connected with the drain electrode of field effect transistor MOS2, the diode D3 that P pole is then connected with the FB pin of vibration chip U1 after resistance R8 forms, the positive pole of described amplifier P5 is connected with the N pole of diode D2, its minus earth, and its output terminal is then connected with the EN pin of vibration chip U1, the VDD pin of described vibration chip U1 connects 12V voltage, and its TOFF pin is then connected with the emitter of triode VT1, its VSS pin ground connection, and its CS pin is then connected with the source electrode of field effect transistor MOS2, and its DRV pin is connected with the grid of field effect transistor MOS2, the P pole of described diode D3 then forms the output terminal of this oscillatory circuit.
7. a kind of novel finger print identification gate control system based on signal pre-processing circuit according to claim 6, is characterized in that: described vibration chip U1 is UCT4392 type integrated chip.
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| CN201510964873.9A CN105427438A (en) | 2015-12-21 | 2015-12-21 | Novel fingerprint identification access control system based on signal pre-processing circuit |
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| CN201510964873.9A CN105427438A (en) | 2015-12-21 | 2015-12-21 | Novel fingerprint identification access control system based on signal pre-processing circuit |
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Application publication date: 20160323 |