CN204946012U - Be applied to large data examinee to take an examination identity authorization system - Google Patents

Abstract

The utility model discloses one to be applied to large data examinee and to take an examination identity authorization system, belong to the heavy examinee in identity identifying technology field and to take an examination Verification System hardware configuration.It comprises the checking platform and clearance device that are arranged on examination hall entrance, checking platform table top is provided with acoustic pickup, fingerprint identification device, RFID reader and admission card for entrance examination scanner, checking platform inside is provided with encoding and decoding device, digital signal processing chip and data-carrier store, acoustic pickup is connected with encoding and decoding device, and encoding and decoding device, data-carrier store, fingerprint identification device, RFID reader, admission card for entrance examination scanner are all connected with described digital signal processing chip with clearance device; The sound signal of acoustic pickup collection to be carried out after A/D conversion together with fingerprint identification device through encoding and decoding device, RFID reader reads and the relevant information of admission card for entrance examination scanner collection transfers to digital signal processing chip in the lump and controlled unlatching or the closedown of clearance device by digital signal processing chip.

Description

Be applied to large data examinee to take an examination identity authorization system

Technical field

The utility model belongs to identity identifying technology field, relates to a kind of examinee and to take an examination the hardware configuration of Verification System, particularly relates to a kind ofly to be applied to large data examinee and to take an examination the hardware configuration of identity authorization system.

Background technology

Along with the scale of various examination and quantity increase year by year, although examination management mechanism takes many kinds of measures and prevents, still effectively can not stop phenomenon of praticing fraud, also frequently act as fraudulent substitute for a person simultaneously, impersonate phenomenon generations such as praticing fraud, the justice of grievous injury examination, just, encroach on examinee's interests, upset civil order.In current all kinds of examination, examinee's standard is investigated into examination hall, and whether examinee's photo that monitoring teacher can only be judged on admission card for entrance examination by naked eyes is consistent, cannot ensure to find the examinee's admission acted as fraudulent substitute for a person.But along with the development of cheating technology, the pseudo-technology for making of examinee's identity is also more and more advanced, and praticing fraud is a kind of conventional means that examinee practises fraud.Differentiate the authenticity of examinee's identity, become a large difficult point of current test management work.If cannot effectively differentiate examinee's identity before examination, will affect the authenticity of the result of examination, fairness and achievement, must cause the unfairness of examination and selection of talented people, therefore modern examination is in the urgent need to fundamentally containing the generation of phenomenon of praticing fraud.

For solving the problem that impersonates of taking an examination, in present examination, adopting the authentication mode of recognition of face+admission card for entrance examination, carrying out the relevant informations such as personal information, face template information, admission card for entrance examination number each examinee enters oneself for the examination registration during on the net and registering.The patent of invention being 201210541132.6 as application number discloses a kind of examination identity authorization system based on recognition of face and certification thereof, and this examination identity authorization system comprises the personal information acquisition system and personal information identifying system that are connected by internet; Personal information acquisition system comprises: camera, and the personal computer be connected with camera circuit, and personal computer connects personal information identifying system by internet; Personal information identifying system comprises: management platform, and it connects personal computer by internet; Server switch, identified server and database server, management platform is connected with database server by server switch with identified server; Terminaling exchange, it is by internet connection server switch; Handheld terminal, its wireless connections terminal switch.This application for a patent for invention is by the face information of camera collection examinee, and identified by the face information of personal information identifying system to examinee, but adopt the mode of recognition of face to carry out identifying that examinee compares and directly check that the effect of examinee is obvious not with supervisor, and adopt recognition of face examination identity authorization system structure comparatively complicated, volume is comparatively large, is not easy to carry and carry.

Summary of the invention

For solving the problems of the technologies described above, the purpose of this utility model is to provide a kind of and is applied to large data Application on Voiceprint Recognition examinee and takes an examination the hardware configuration of Verification System.

For achieving the above object, the technical solution of the utility model is:

One is applied to large data examinee and takes an examination identity authorization system, it is characterized in that: comprise the checking platform and clearance device that are arranged on examination hall entrance, described checking platform table top is provided with acoustic pickup, fingerprint identification device, RFID reader and admission card for entrance examination scanner, described checking platform inside is provided with encoding and decoding device, digital signal processing chip and data-carrier store, described acoustic pickup is connected with encoding and decoding device, described encoding and decoding device, data-carrier store, fingerprint identification device, RFID reader, admission card for entrance examination scanner is all connected with described digital signal processing chip with clearance device, the sound signal of described acoustic pickup collection carries out transferring to digital signal processing chip in the lump together with the finger print information of fingerprint identification device collection, examinee's ID (identity number) card information of RFID reader reading and the admission card for entrance examination information of admission card for entrance examination scanner collection after A/D conversion and being controlled unlatching or the closedown of clearance device by digital signal processing chip through encoding and decoding device.

During utility model works, acoustic pickup is for gathering the audio-frequency information of candidate and inputting in encoding and decoding device by this audio-frequency information by microphone, audio-frequency information carries out A/D conversion in encoding and decoding device, fingerprint identification device is for gathering finger print information, RFID reader is for gathering the ID (identity number) card information of examinee, admission card for entrance examination scanner is for gathering the admission card for entrance examination information of examinee, the finger print information that sound signal after A/D conversion gathers together with fingerprint identification device, the admission card for entrance examination information of examinee's ID (identity number) card information that RFID reader reads and the collection of admission card for entrance examination scanner all sends digital signal processing chip in synchronous serial communication mode, digital signal processing chip sends unlatching or the closedown that instruction controls clearance device after carrying out every pretreatment operation to signal.

Further, described acoustic pickup comprises acoustic pickup shell, enters line part, fixation clip and jump ring, described enter line part and fixation clip be arranged on acoustic pickup enclosure respectively, described jump ring is fixed on the inner side edge of the acoustic pickup shell above fixation clip, and being provided with in the middle of described fixation clip can around the rotating disk of fixation clip central rotation.

Further, described rotating disk is evenly provided with some apertures.

Further, the model that described encoding and decoding device selects TI company to produce is the encoding and decoding device of TLC320AD50C.

Further, the model that described digital signal processing chip selects TI company to produce is the digital signal processing chip of TMS320VC5402.

Further, described clearance device comprises triroller gate base, braking club assembly and motor, and described braking club assembly is rotatably mounted on triroller gate base, and described motor is arranged in triroller gate base; Described motor is electrically connected with digital signal processing chip and drives braking club assembly to rotate.

Further, also comprise the jaw clutch be arranged on described motor output shaft, described motor drives braking club assembly to rotate by jaw clutch.

Further, described fingerprint identification device comprises prism, frame assembly, lens combination, cmos image sensor, light source; Described prism, light source, lens combination, cmos image sensor are placed in frame assembly successively.

Further, described prism waits girdle prism, and two isogonism angles are 50 degree.

Further, described RFID reader comprises radio-frequency (RF) front-end circuit and central processing unit, and described radio-frequency (RF) front-end circuit comprises radiofrequency signal transmission circuit, rf signal reception circuit, emission of radio frequency signals circuit and frequency synthesizer;

Described radiofrequency signal transmission circuit comprises dual-mode antenna, antenna change-over switch and circulator; Described emission of radio frequency signals circuit comprises DAC-circuit, frequency mixer and preposition pre-arcing road; Described rf signal reception circuit comprises adc circuit, frequency mixer and low-noise amplification circuit;

Described circulator is connected with low-noise amplification circuit with preposition pre-arcing road simultaneously; Low-noise amplification circuit is connected with the radio frequency reception channel of central processing unit after adc circuit through frequency mixer, and the radio frequency transmitting channel of central processing unit is connected with preposition pre-arcing road after frequency mixer through DAC-circuit; Described frequency synthesizer is connected with the frequency mixer in emission of radio frequency signals circuit with rf signal reception circuit after discharge circuit simultaneously.

Compared with prior art, the beneficial effects of the utility model are:

1, in the utility model, this examinee Verification System of taking an examination is arranged on porch, examination hall, it comprises acoustic pickup, encoding and decoding device, digital signal processing chip, data-carrier store, RFID reader, clearance device, admission card for entrance examination scanner and fingerprint identification device, one-piece construction is simple, small volume, be easy to carry and carry, being applicable to the places such as examination hall.

2, in the utility model, acoustic pickup adds rotating disk at fixation clip place, the aperture of the some quantity in order to volume of reception is all had owing to entering sound components interior majority, by fixation clip place turntable rotation, the aperture number change that aperture correspondence wherein enters line part regulates, and can realize frequency change, the volume change into sound; Use jump ring mode to fix acoustic pickup, remove loaded down with trivial details dismounting, installation that tradition uses screw or fixing snap fit from, even destroy the structure of access section, its structure is simple, easy to use, more can reduce the cost caused in production run simultaneously.

3, in the utility model, the model that encoding and decoding device selects TI company to produce is the encoding and decoding device of TLC320AD50C, this TLC320AD50C encoding and decoding device is a kind of 16bit high performance audio signal codec chip, include frequency overlapped-resistable filter and reconfigurable filter, and this chip adopts single 5V Power supply or 5V and 3.3V to combine power supply, during work, maximum power dissipation is 120mW, makes the small volume of this chip, is applicable to portable set.

4, in the utility model, the model that digital signal processing chip selects TI company to produce is the digital signal processing chip of TMS320VC5402, this TMS320VC5402 digital signal processing chip adopts the Harvard structure improved, and On-Chip peripheral comprises multichannel buffered serial port, 8bit main frame and 16bit timer, separately be equipped with powerful order set, make this chip have very high processing speed.

5, in the utility model, clearance device comprises triroller gate base, braking club assembly and motor, motor is electrically connected with digital signal processing chip and makes the relevant action driving braking club assembly to rotate according to the instruction that digital signal processing chip sends, and examinee is let pass speed, and clearance efficiency is higher.

6, in the utility model, by prism to the refraction of light and reflex, fingerprint image is imaged onto on cmos image sensor through lens combination, thus carries out fingerprint recognition.

7, in the utility model, this RFID reader structure is simple, is integrated in central processing unit by modulates baseband signals demodulator circuit, thus simplifies the radio-frequency (RF) front-end circuit structure in RFID reader, and make the antijamming capability of reader reduce, stability is better; Central processing unit adopts fpga chip, with low cost, improves stability further, and programmability is stronger, is more convenient for by Integrated Simulation in chip, and by software function replacement circuit module, thus make stability better, circuit structure is simpler.

Accompanying drawing explanation

Fig. 1 is process flow diagram of the present utility model;

Fig. 2 is the structural representation of acoustic pickup in the utility model;

Fig. 3 is data-carrier store data reading circuit figure in the utility model;

Fig. 4 is the structural representation of device of letting pass in the utility model;

Fig. 5 is the structural representation of fingerprint identification device in the utility model;

Fig. 6 is the index path of fingerprint identification device in the utility model;

Fig. 7 is the circuit structure block diagram of RFID reader in the utility model;

Fig. 8 is the structural representation sketch verifying platform in the utility model;

Wherein, Reference numeral is: 1-acoustic pickup, 2-encoding and decoding device, 3-digital signal processing chip, 4-data-carrier store, 5-clearance device, 6-fingerprint identification device, 7-checking platform, 8-RFID reader, 9-admission card for entrance examination scanner, 11-acoustic pickup shell, 12-enter line part, 13-fixation clip, 14-jump ring, 121-sound inlet, 131-rotating disk, 132-aperture, 51-triroller gate base, 52-braking club assembly, 53-motor, 61-prism, 62-frame assembly, 63-lens combination, 64-cmos image sensor, 65-light source, (611, 612, 613)-face, 71-cover body.

Embodiment

Below in conjunction with accompanying drawing, the utility model is described further:

Embodiment one

One is applied to large data examinee and takes an examination identity authorization system, this hardware configuration is installed on porch, examination hall, it comprises the checking platform 7 and clearance device 5 that are arranged on examination hall entrance, this checking platform 7 table top is provided with acoustic pickup 1, fingerprint identification device 6, RFID reader 8 and admission card for entrance examination scanner 9, and this checking platform 1 inside is provided with encoding and decoding device 2, digital signal processing chip 3 and data-carrier store 4.Acoustic pickup 1 is connected with encoding and decoding device 2, carries out A/D conversion in the sound signal input encoding and decoding device 2 that acoustic pickup 1 collects.Encoding and decoding device 2, fingerprint identification device 6 are all connected with digital signal processing chip 3 with RFID reader 8, and this fingerprint identification device 6 is for gathering the finger print information of examinee; This RFID reader 8 for gathering the ID (identity number) card information of examinee, when examinee enters examination hall, need by its I.D. in the enterprising line scanning identification of RFID reader 8; The admission card for entrance examination of examinee is printed on admission card for entrance examination number, identification card number, name and Quick Response Code, the admission card for entrance examination number of examinee, the information such as identification card number and name is comprised in Quick Response Code, wherein Quick Response Code selects QRCode Quick Response Code, when examinee enters examination hall, its admission card for entrance examination is placed on the admission card for entrance examination scanner 9 of checking platform 1, the examinee information on the camera collection admission card for entrance examination in admission card for entrance examination scanner 9.Examinee's ID (identity number) card information that sound signal after encoding and decoding device 2 is changed gathers the finger print information of examinee together with fingerprint identification device 6, RFID reader 8 gathers and the admission card for entrance examination information that admission card for entrance examination scanner 9 gathers all transfer to digital signal processing chip 3 in the lump and carry out analyzing, processing and comparison.As preferably, checking platform 7 is also provided with cover body 71, effectively can reduces by this cover body 71 impact that when acoustic pickup 1 gathers sound, ambient noise causes.

During work, acoustic pickup 1 is for gathering the audio-frequency information of candidate and inputting in encoding and decoding device 2 by this audio-frequency information by microphone, audio-frequency information carries out A/D conversion in encoding and decoding device 2, the finger print information that fingerprint identification device 6 gathers, examinee's ID (identity number) card information that RFID reader 8 gathers, the admission card for entrance examination information that admission card for entrance examination scanner 9 gathers and the sound signal after A/D conversion all send digital signal processing chip 3 in synchronous serial communication mode, unlatching or closedown that instruction controls clearance device 5 is sent after digital signal processing chip 3 pairs of signals carry out every pretreatment operation.

Embodiment two

On the basis of embodiment one, this acoustic pickup 1 comprises acoustic pickup shell 11, enters line part 12, fixation clip 13 and jump ring 14, described enter the inside that line part 12 and described fixation clip 13 are arranged on acoustic pickup shell 11 respectively, described jump ring 14 arranges the inner side edge of the acoustic pickup shell 11 be fixed on above fixation clip, easily can be reached by clip spring structure and install and dismounting object, and can not modular construction be damaged in unloading process.There is rotatable rotating disk 131 centre of described fixation clip 13, described rotating disk 131 can at it in the plane around the central rotation of fixation clip 13.Further, the card of described rotating disk 131 is evenly provided with multiple aperture 132, aperture 132 size is in the same size with the sound inlet 21 entering line part 12, described sound inlet 121 aligning part entering line part 12 is non-homogeneous, thus by rotary turnplate 131, the hole that can obtain varying number overlaps, and makes audio frequency receive and can produce multiple change.

Embodiment three

On the basis of embodiment one or embodiment two, the model that described encoding and decoding device 2 selects TI company to produce is the encoding and decoding device 2 of TLC320AD50C, this TLC320AD50C encoding and decoding device 2 is a kind of 16bit high performance audio signal codec chips, include frequency overlapped-resistable filter and reconfigurable filter, the highest sample frequency can reach 22.05kHz, and specifically arranges by outside programming.This chip has the synchronous serial communication interface (SPI) that an energy is connected with many dsp chips; Adopt two groups of analog inputs and two groups of modulating output, have enough common mode inhibition capacity, can be operated in difference or single ended mode, input gain and output attenuatoin can by outside programming Control; Adopt single 5V Power supply or 5V and 3.3V to combine power supply, during work, maximum power dissipation is 120mw; Small volume, is applicable to portable set.In order to offset the interference from circuit remainder that simulating signal is subject in transmitting procedure as far as possible, what TLC320AD50C chip adopted is Differential Input, Single-end output mode.In order to convert external audio signal to differential signal, fore-end have employed high-performance, the low noise operational amplifier TLC2272 of Tl company, and this device only needs a small amount of peripheral circuit, can realize above-mentioned power and energy and reach system requirements; Single-end output signal then exports after audio-frequency power amplifier (as LM386 etc.) amplifies.

Embodiment four

On the basis of above-described embodiment, the model that described digital signal processing chip 3 selects TI company to produce is the digital signal processing chip 3 of TMS320VC5402.The digital signal processing chip 3 of this TMS320VC5402 is a kind of 16bit high speed and fixed-point low-power consumption dsp chip, it adopts the Harvard structure improved, program is separated with data and is deposited, and there is the bus of 8 massive parallelisms inside, and integrated chip has abundant on-chip memory resource.On-Chip peripheral comprises multichannel buffered serial port (McBSP), 8bit main frame (HPI) and 16bit timer; The CPU structure optimized, comprises the logical block of 40bit arithmetic logical unit (ALU), 17bit × 17bit parallel multiplier and applicable digital signal processing algorithm; Separately be equipped with powerful order set, make this chip have very high processing speed.In addition, this chip adopts dual power supply mechanism, i.e. core power and I/0 power supply two parts, and wherein core power adopts 1.8V, effectively can reduce chip power-consumption; I/0 power acquisition 3.3V, dsp chip can direct and outer low pressure device interface without the need to extra level shifting circuit.

Embodiment five

On the basis of above-described embodiment, this data-carrier store 4 comprises many wordline; Organize bit line more; Multiple storage unit, arranges in a matrix fashion, and wherein each storage unit can by this wordline of correspondence and this corresponding group bit line access data; Multiple amplifier couples describedly organizes bit line more, in order to read and data in amplifying and storage unit; Multiple diode, couples and described organizes bit line more; And a voltage source, carry out pre-charged through group bit lines many described in described diode pair.The data reading circuit of this data-carrier store 4 as shown in Figure 3.Amplifier has two input ends, couples the first bit line BL and the second bit line BL respectively.First switch couples the first bit line BL, and second switch couples the second bit line BL.The anode of diode couples voltage source V DD, and its negative electrode couples the first switch and second switch, and utilizes the conducting of the first switch and second switch to make voltage source V DD carry out pre-charged to the first bit line BL and the second bit line BL respectively.The first transistor has one first source electrode, one first drain electrode and a first grid, and wherein this first source electrode couples this first bit line BL, and this first drain electrode couples a data storage element, and this first grid couples a wordline WL.Transistor seconds has one second source electrode, one second drain electrode and a second grid, and wherein this second source electrode couples this second bit line BL, and this second drain electrode couples this data storage element, and this second grid couples this wordline WL.When data storage element is chosen to, wordline WL can transmit a high voltage signal, in order to conducting the first transistor and transistor seconds, make the data stored in data storage element be sent to amplifier through the first bit line BL and the second bit line BL, amplifier is that the data in order to receive according to first input end and the second input end export data in its output terminal.Data storage element more comprises one first phase inverter, and its output terminal couples the first drain electrode of this first transistor, one second phase inverter, and its input end couples the output terminal of this first phase inverter, and its output terminal couples the second drain electrode of this transistor seconds.In the present embodiment, the magnitude of voltage of the operating voltage VDD of storer is about 1.2V to 1.6V, and the pressure drop that diode 22 produces is about 0.6V to 0.8V.

Embodiment six

On the basis of above-described embodiment, described clearance device 5 comprises triroller gate base 51, braking club assembly 52 and motor 53, and described braking club assembly 52 is rotatably mounted on triroller gate base 51, and described motor 53 is arranged in triroller gate base 51.Motor 53 is electrically connected with digital signal processing chip 3 and makes the relevant action driving braking club assembly 52 to rotate according to the instruction that digital signal processing chip 3 sends, and examinee is let pass speed, and clearance efficiency is higher.

Further, also comprise the jaw clutch be arranged on described motor 53 output shaft, described motor 53 drives braking club assembly 52 to rotate by jaw clutch.

Embodiment seven

On the basis of above-described embodiment, this fingerprint identification device comprises prism 61, frame assembly 62, lens combination 63, cmos image sensor 64, light source 65; Prism 61 is for waiting girdle prism, and two isogonism angles are 50 degree; Prism 61, light source 65, lens combination 63, cmos image sensor 64 are placed in frame assembly 62 successively.Light source 55 is positioned at 611 of prism 61, by tested finger by 613 of prism 61, because finger print is raised in finger surface, 613 close contacts of fingerprint and prism 61, destroy the condition of total reflection, a part of incident light will be lost by finger, remaining portion's dichroic reflection, go out from 612 transmissions of prism 61, the photoimaging of point reflection each on fingerprint on cmos image sensor 64, and is shown as the low light level by lens combination 63.And the recess between fingerprint projection, its refractive index is less, incident light can be totally reflected herein, so each point of recess is shown as high light on cmos image sensor 64, like this, from the tested finger surface that cmos image sensor 64 shows, the power of each point reflected light, just can obtain fingerprint lines clearly.

Because finger print imaging in prism 61 is the virtual image, the plane at its place and optical axis are off plumbs, after scioptics group 63 imaging also with optical axis out of plumb, by cmos image sensor 64 slant setting, and be adjusted to the target surface of cmos image sensor 64 and image planes coincide, reduce distortion, image is more clear.

Embodiment eight

On the basis of above-described embodiment, this RFID reader 8 comprises radio-frequency (RF) front-end circuit and central processing unit, and described radio-frequency (RF) front-end circuit comprises radiofrequency signal transmission circuit, rf signal reception circuit, emission of radio frequency signals circuit and frequency synthesizer.

Described radiofrequency signal transmission circuit comprises dual-mode antenna, antenna change-over switch and circulator; Described emission of radio frequency signals circuit comprises DAC-circuit (D/A converting circuit), frequency mixer and preposition pre-arcing road (PA); Described rf signal reception circuit comprises adc circuit (analog to digital conversion circuit), frequency mixer and low-noise amplification circuit (LNA).

Described circulator is connected with low-noise amplification circuit with preposition pre-arcing road simultaneously; Low-noise amplification circuit is connected with the radio frequency reception channel of central processing unit after adc circuit through frequency mixer, and the radio frequency transmitting channel of central processing unit is connected with preposition pre-arcing road after frequency mixer through DAC-circuit; Described frequency synthesizer is connected with the frequency mixer in emission of radio frequency signals circuit with rf signal reception circuit after discharge circuit simultaneously.

The principle of work of rf signal reception circuit is that the radiofrequency signal received first is carried out down-converted, the local oscillation signal of 875MHz is produced by frequency synthesizer, then through amplifier, enter the frequency mixer in rf signal reception circuit, carry out down coversion, the radiofrequency signal of 915MHz is obtained after frequency conversion the intermediate-freuqncy signal of 40Mhz, then after simple filtering circuit, adc circuit is sent to, wherein adc circuit comprises ADC conversion chip, this ADC conversion chip adopts the AD9214 chip of analog company, its sampling clock is 80MHz, sampling resolution is 10bit, then the digital signal after AD conversion is input in FPGA.

The principle of work of emission of radio frequency signals circuit is completed in FPGA system inside the modulation /demodulation of baseband signal, then 40MHz intermediate-freuqncy signal is converted to, the digital medium-frequency signal that FPGA produces is sent to DAC-circuit, described DAC-circuit comprises DAC chip, this DAC conversion chip adopts the AD9762 chip of analog company, its change over clock frequency is 125MHz, change figure place into 12bit, the local oscillation signal 875MHz produced with frequency synthesizer in frequency mixer after simple filtering circuit carries out mixing, and then through preposition put in advance after pass the signal on antenna.According to EPCClass1generation2 standard, reader is operated in half duplex communication pattern, and so antenna change-over switch need be controlled by FPGA, carrys out control signal launch and accept according to reiving/transmitting state.

Described central processing unit adopts fpga chip.During concrete enforcement, adopt the acp chip of XC6SLX16-2CSG324FPGA chip as digital baseband modulation /demodulation of XILINX company, it has 14579 LogicCells unit, 136Kbit internal storage unit, 32 DSP48A1 algorithm process unit, this chip all can satisfy the demands from the viewpoint of programmable logic resource, data buffer storage, IP arithmetic element etc.

Described fpga chip has Embeded CPU, radio frequency reception channel and radio frequency transmitting channel; Described radio frequency reception channel comprises the DDC circuit, cic filter, forming filter, FM0/Miller decoder module and the CRC16 correction verification module that are connected successively, described CRC16 correction verification module is connected with embedded type CPU, and described DDC circuit is used for from adc circuit incoming radio frequency signal; Described radio frequency transmitting channel comprises the CRC5/16 correction verification module, PIE coding module, forming filter, UDC circuit and the bandpass filter that are connected successively, embedded type CPU is connected with CRC5/16 correction verification module, and after bandpass filter, radiofrequency signal is sent to adc circuit.

Data are sent in fpga chip by radio frequency reception channel after ADC conversion, and ADC change after data be 40MHz intermediate-freuqncy signal, Digital Up Convert circuit (DDC circuit) carries out a Digital Down Convert again to the 40MHz digital medium-frequency signal collected, digital baseband signal is after Digital Down Convert, then cic filter filtering is carried out, then filtering process is formed to filtered signal, carry out FM0/Miller decoding again, CPU in FPGA sheet can be allowed after CRC16 checking treatment to obtain related data.In FPGA sheet, CPU will send to the data of label, first CRC5/16 coding checkout is carried out, then PIE coding is carried out, the all available HDL language of these coded programs or IP kernel realize, then forming filter is used to carry out waveform filtering shaping, because signal is now also baseband signal, therefore also need to adopt Digital Up Convert circuit (UDC circuit) by the digital intermediate frequency section of modulates baseband signals to 40MHz, eventually pass after bandpass filter carries out filtering to digital medium-frequency signal and send to outside DAC-circuit.

Claims (10)

1. one kind is applied to large data examinee and takes an examination identity authorization system, it is characterized in that: comprise the checking platform (7) and clearance device (5) that are arranged on examination hall entrance, described checking platform (7) table top is provided with acoustic pickup (1), fingerprint identification device (6), RFID reader (8) and admission card for entrance examination scanner (9), described checking platform (7) inside is provided with encoding and decoding device (2), digital signal processing chip (3) and data-carrier store (4), described acoustic pickup (1) is connected with encoding and decoding device (2), described encoding and decoding device (2), data-carrier store (4), fingerprint identification device (6), RFID reader (8), admission card for entrance examination scanner (9) is all connected with described digital signal processing chip (3) with clearance device (5), examinee's ID (identity number) card information that the finger print information that the sound signal that described acoustic pickup (1) gathers gathers together with fingerprint identification device (6) after encoding and decoding device (2) carries out A/D conversion, RFID reader (8) read and the admission card for entrance examination information that admission card for entrance examination scanner (9) gathers transfer to digital signal processing chip (3) in the lump and are controlled unlatching or the closedown of clearance device (5) by digital signal processing chip (3).

2. be applied to large data examinee as claimed in claim 1 to take an examination identity authorization system, it is characterized in that: described acoustic pickup (1) comprises acoustic pickup shell (11), enters line part (12), fixation clip (13) and jump ring (14), described enter line part (12) and fixation clip (13) to be arranged on acoustic pickup shell (11) respectively inner, described jump ring (14) is fixed on the inner side edge of the acoustic pickup shell (11) of fixation clip (13) top, and being provided with in the middle of described fixation clip (13) can around the rotating disk (131) of fixation clip (13) central rotation.

3. be applied to large data examinee as claimed in claim 2 to take an examination identity authorization system, it is characterized in that: described rotating disk (131) is evenly provided with some apertures (132).

4. be applied to large data examinee as claimed in claim 1 to take an examination identity authorization system, it is characterized in that: the model that described encoding and decoding device selects TI company to produce is the encoding and decoding device of TLC320AD50C.

5. be applied to large data examinee as claimed in claim 1 to take an examination identity authorization system, it is characterized in that: the model that described digital signal processing chip selects TI company to produce is the digital signal processing chip of TMS320VC5402.

6. be applied to large data examinee as claimed in claim 1 to take an examination identity authorization system, it is characterized in that: described clearance device comprises triroller gate base (51), braking club assembly (52) and motor (53), described braking club assembly (52) is rotatably mounted on triroller gate base (51), and described motor (53) is arranged in triroller gate base (51); Described motor (53) is electrically connected with digital signal processing chip (3) and drives braking club assembly (52) to rotate.

7. be applied to large data examinee as claimed in claim 6 to take an examination identity authorization system, it is characterized in that: also comprise the jaw clutch be arranged on described motor (53) output shaft, described motor (53) drives braking club assembly (52) to rotate by jaw clutch.

8. be applied to large data examinee as claimed in claim 1 to take an examination identity authorization system, it is characterized in that: described fingerprint identification device (6) comprises prism (61), frame assembly (62), lens combination (63), cmos image sensor (64), light source (65); Described prism (61), light source (65), lens combination (63), cmos image sensor (64) are placed in frame assembly (62) successively.

9. be applied to large data examinee as claimed in claim 8 to take an examination identity authorization system, it is characterized in that: described prism (61) waits girdle prism, and two isogonism angles are 50 degree.

10. be applied to large data examinee as claimed in claim 1 to take an examination identity authorization system, it is characterized in that: described RFID reader (8) comprises radio-frequency (RF) front-end circuit and central processing unit, described radio-frequency (RF) front-end circuit comprises radiofrequency signal transmission circuit, rf signal reception circuit, emission of radio frequency signals circuit and frequency synthesizer;

Described radiofrequency signal transmission circuit comprises dual-mode antenna, antenna change-over switch and circulator; Described emission of radio frequency signals circuit comprises DAC-circuit, frequency mixer and preposition pre-arcing road; Described rf signal reception circuit comprises adc circuit, frequency mixer and low-noise amplification circuit;

Described circulator is connected with low-noise amplification circuit with preposition pre-arcing road simultaneously; Low-noise amplification circuit is connected with the radio frequency reception channel of central processing unit after adc circuit through frequency mixer, and the radio frequency transmitting channel of central processing unit is connected with preposition pre-arcing road after frequency mixer through DAC-circuit; Described frequency synthesizer is connected with the frequency mixer in emission of radio frequency signals circuit with rf signal reception circuit after discharge circuit simultaneously.