CN110363969A - A kind of flash disk warning device for classroom multimedia platform - Google Patents
A kind of flash disk warning device for classroom multimedia platform Download PDFInfo
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- CN110363969A CN110363969A CN201810318654.7A CN201810318654A CN110363969A CN 110363969 A CN110363969 A CN 110363969A CN 201810318654 A CN201810318654 A CN 201810318654A CN 110363969 A CN110363969 A CN 110363969A
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/18—Status alarms
- G08B21/24—Reminder alarms, e.g. anti-loss alarms
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Abstract
The invention discloses a kind of flash disk warning devices for classroom multimedia platform.The device includes wireless pulse transmitting module, wireless pulse receiving module, range finder module, alarm distance judgment module, buzzing alarm module, power module；The pulse signal feature and the received pulse signal feature of wireless pulse receiving module that the range finder module is emitted by wireless pulse transmitting module, calculate the distance of wireless pulse transmitting module to pulse-echo face.When use, when giving lessons terminates push-and-pull lid closing multimedia platform, the reflecting surface of pulse is push-and-pull lid, the distance between horizontal plane where push-and-pull lid at the top of horizontal plane to the multimedia where the distance surveyed is equal to multimedia platform flash disk socket, alarm distance judgment module can judge the state of multimedia platform closing, end of giving lessons, then carry out buzzing alarm by buzzing alarm module.The present invention solves the problems, such as that of the existing technology and versatile, false-alarm probability is low.
Description
Technical field
The present invention relates to a kind of flash disk warning devices, it is more particularly related to a kind of flat for classroom multimedia
The flash disk warning device of platform.
Background technique
Currently, generalling use multimedia mode in order to improve Classroom Teaching and efficiency of giving lessons and imparting knowledge to students.One
Change multimedia platform instead of original religion table, this multimedia platform integrates the equipment such as projector, computer, display
Change, and can realize centralized control.Classroom multimedia platform is provided with integrated console, and flash disk socket, power supply control is arranged inside
Button processed etc., top are provided with the push-and-pull lid for being used to open or closing the multimedia platform.Teacher carries out classroom instruction
When, it needs to give lessons preprepared in courseware and other aided education content copies to flash disk, passes through multimedia platform
Flash disk socket is attached with multimedia equipment, then carries out explanation of giving lessons.
However, this multimedia platform give lessons to teacher classroom offer convenience while, also bring trouble to teacher,
Teacher often forgets flash disk after giving lessons, and cannot extract from the flash disk socket of multimedia platform, award in time to bring
Class data loses, influence to give lessons process the problem of, especially for being related to for the teaching of giving lessons of secure content, but will cause to let out
Reveal the generation of the serious problems such as secret.
Therefore, it is badly in need of designing a kind of device, after teacher gives lessons, when closing multimedia platform by push-and-pull lid,
Teacher can be reminded to take flash disk away in time, unnecessary trouble is brought with exempt from customs examination classroom instruction.
Summary of the invention
Present invention aim to address existing classroom multimedia platforms to be easy the problem of losing flash disk, and end of giving lessons is by pushing away
When lid being drawn to close multimedia platform, teacher can be reminded to take flash disk away in time, it is unnecessary to bring with exempt from customs examination classroom instruction
Trouble.
In order to achieve the above-mentioned object of the invention, it alarms and fills the present invention provides a kind of flash disk for classroom multimedia platform
It sets, flash disk socket is provided in the multimedia platform, top, which is provided with, is used to open or closes the multimedia platform
Push and pull lid.In technical solution disclosed in this invention, the flash disk warning device is pasted onto the outside of flash disk, including wireless
Electric pulse transmitting module, wireless pulse receiving module, range finder module, alarm distance judgment module, buzzing alarm module, power supply
Module, wherein
Wireless pulse transmitting module: it, which is used to emit wireless pulse signal and is coupled to wireless pulse, receives mould
Block, when the flash disk for being provided with flash disk warning device is inserted into the flash disk socket of the multimedia platform, the wireless pulse letter
Number the direction of the launch it is vertical with the multimedia platform top levels and upwards；
Wireless pulse receiving module: it is used to receive what the wireless pulse transmitting module being reflected back toward was emitted
Pulse signal, and export to range finder module；
Range finder module: its pulse signal feature emitted according to wireless pulse transmitting module and wireless pulse connect
The received pulse signal feature of module institute is received, calculates the distance of wireless pulse transmitting module to pulse-echo face, and export
To alarm distance judgment module；
Alarm distance judgment module: it presets alarm distance thresholding, and with the range finder module institute it is calculated away from
From being compared, if the calculated distance of range finder module institute is less than or equal to alarm distance thresholding, buzzing alarm is exported
Otherwise enabling signal is not exported to buzzing alarm module；Wherein, the alarm distance threshold value is that the multimedia platform is excellent
The distance between horizontal plane where push-and-pull lid at the top of horizontal plane to the multimedia where disk socket；
Buzzing alarm module: it is used to receive the alarm enabling signal of buzzing caused by alarm distance judgment module, and root
Buzzing alarm is issued according to the signal；
Power module: it is used to provide power supply.
Further, in technical solution disclosed in this invention, pulse caused by the wireless pulse transmitting module
Signal is linear FM signal f (t), it may be assumed that
Wherein, a (t) is the envelope signal of the linear FM signal, ω0It is the angular frequency of the linear FM signal, T
It is the carrier cycle time, F is the linear frequency modulation factor, and t is time parameter.
Preferably, in technical solution disclosed in this invention, the envelope signal a (t) is prolate spheroidal wave functions signal
(prolate spheroidal wave function)；The value range of the linear frequency modulation factor F be more than or equal to 15 and
Less than or equal to 18.5.
Further, the wireless pulse receiving module it is received by reflective surface return pulse signal be the 1st
Reach the pulse signal of wireless pulse receiving module.
Preferably, in technical solution disclosed in this invention, the power module is provided with switch.
Further, transmitting pulse signal and radio that the range finder module is coupled according to wireless pulse transmitting module
Pulse receiving module received reflected impulse signal difference on the frequency and the linear frequency modulation factor, it is round-trip to calculate wireless pulse
The time parameter of transmission path, to obtain the wireless pulse transmitting module the distance between to pulse-echo plane.
Preferably, in technical solution disclosed in this invention, the envelope signal of the linear FM signal is time-bands
0 rank of the wide long-pending factor greater than 4.2 π or 1 rank prolate spheroidal wave functions signal.
Preferably, in technical solution disclosed in this invention, the emitted pulse letter of wireless pulse transmitting module
Number centre frequency be 4.3GHz.
Preferably, in technical solution disclosed in this invention, the generation device of the linear FM signal is voltage-controlled vibration
Swing device.
Compared with prior art, the invention has the following beneficial effects:
1. in the present invention, since disclosed technical solution is provided with wireless pulse transmitting module, wireless pulse
Receiving module, range finder module, alarm distance judgment module, buzzing alarm module；The range finder module is sent out by wireless pulse
The received pulse signal feature of pulse signal feature and wireless pulse receiving module institute that module is emitted is penetrated, nothing is calculated
Line electric pulse transmitting module to pulse-echo face distance；In use, closing multimedia by push-and-pull lid after giving lessons
When platform, the reflecting surface of pulse is push-and-pull lid, horizontal plane where the distance surveyed is equal to multimedia platform flash disk socket to institute
The distance between horizontal plane where push-and-pull lid at the top of multimedia is stated, to can judge by alarm distance judgment module more
The state of media platform closing, end of giving lessons, then buzzing alarm is carried out by buzzing alarm module, it issues and alarms to teacher
Signal prompts to take flash disk away, to solve problems of the prior art；
2. in the present invention, due to the flash disk warning device of disclosed Technical Design, it is viscous to can be used as independent device
It is attached to the outside of flash disk, physical damage will not be carried out to existing flash disk, to improve the versatility of device；
3. the envelope signal of the linear FM signal in the present invention, emitted by disclosed technical solution is long ball
Surface wave function signal, the function signal, can be to greatest extent at the same time under the conditions of bandwidth product compared with other envelope signals
The energy of signal is concentrated in signal bandwidth, compared with prior art, thus the pulse signal that the device made is emitted
With preferable encircled energy, the anti-interference ability of signal and the reliability of signal transmission are improved；
4. the linear frequency modulation factor F of the linear FM signal in the present invention, emitted by disclosed technical solution
Value range be more than or equal to 15 and be less than or equal to 18.5, in the value range, keep the ranging sensitivity of the device significant
It improves, so as to effectively identify that push-and-pull lid closes the state of multimedia platform, reduces false-alarm probability.
Detailed description of the invention
Fig. 1 is the classroom multimedia platform structural schematic diagram of the embodiment of the present invention.
Fig. 2 is the designed device implementation complexity of the embodiment of the present invention and the relation curve of linear frequency modulation factor F.
Fig. 3 is the designed device range accuracy of the embodiment of the present invention and the relation curve of linear frequency modulation factor F.
Wherein, the corresponding relationship of appended drawing reference and component names is as follows:
Multimedia platform 100, integrated console 101, flash disk socket 102, push-and-pull lid 103.
Specific embodiment
Present invention will be described in further detail below with reference to the accompanying drawings, to enable those skilled in the art referring to specification text
Word can be implemented accordingly.
In the prior art, multimedia platform give lessons to teacher classroom offer convenience while, also brought to teacher
Trouble, teacher often forgets flash disk after giving lessons, and cannot extract in time from the flash disk socket of multimedia platform, thus band
Lost come data of giving lessons, influence to give lessons process the problem of, especially for being related to for the teaching of giving lessons of secure content, but will lead
Cause to betray the pot to the roses etc. the generations of serious problems.
Aiming at the problems existing in the prior art, the embodiment of the invention discloses a kind of for the excellent of classroom multimedia platform
Disk warning device.As shown in Figure 1,100 top of multimedia platform is provided with integrated console 101, in integrated console 101
It is provided with flash disk socket 102, power control button etc., is provided at the top of the multimedia platform 100 and is used to open or closes institute
State the push-and-pull lid 103 of multimedia platform.In scheme, the flash disk warning device is pasted onto the outside of flash disk, including wireless
Electric pulse transmitting module, wireless pulse receiving module, range finder module, alarm distance judgment module, buzzing alarm module, power supply
Module, wherein
Wireless pulse transmitting module: it, which is used to emit wireless pulse signal and is coupled to wireless pulse, receives mould
Block, when the flash disk for being provided with flash disk warning device is inserted into the flash disk socket of the multimedia platform, the wireless pulse letter
Number the direction of the launch it is vertical with the multimedia platform top levels and upwards；
Wireless pulse receiving module: it is used to receive what the wireless pulse transmitting module being reflected back toward was emitted
Pulse signal, and export to range finder module；
Range finder module: its pulse signal feature emitted according to wireless pulse transmitting module and wireless pulse connect
The received pulse signal feature of module institute is received, calculates the distance of wireless pulse transmitting module to pulse-echo face, and export
To alarm distance judgment module；
Alarm distance judgment module: it presets alarm distance thresholding, and with the range finder module institute it is calculated away from
From being compared, if the calculated distance of range finder module institute is less than or equal to alarm distance thresholding, buzzing alarm is exported
Otherwise enabling signal is not exported to buzzing alarm module；Wherein, the alarm distance threshold value is that the multimedia platform is excellent
The distance between horizontal plane where push-and-pull lid at the top of horizontal plane to the multimedia where disk socket；
Buzzing alarm module: it is used to receive the alarm enabling signal of buzzing caused by alarm distance judgment module, and root
Buzzing alarm is issued according to the signal；
Power module: it is used to provide power supply.
In technical solution disclosed in the embodiment of the present invention, the range finder module passes through wireless pulse transmitting module institute
The received pulse signal feature of pulse signal feature and wireless pulse receiving module institute of transmitting, calculates wireless pulse
Transmitting module to pulse-echo face distance；As shown in Figure 1, in use, the flash disk socket of flash disk insertion multimedia platform, when awarding
After class, when closing multimedia platform by push-and-pull lid, the reflecting surface of pulse at this time is push-and-pull lid, the distance etc. surveyed
The distance between horizontal plane where push-and-pull lid at the top of horizontal plane to the multimedia where multimedia platform flash disk socket；?
In the alarm distance judgment module, alarm distance thresholding is preset, the alarm distance threshold value is flat for the multimedia
The distance between horizontal plane where push-and-pull lid at the top of horizontal plane to the multimedia where platform flash disk socket, to pass through alarm
Distance judgment module can judge the state of multimedia platform closing, end of giving lessons, then carry out bee by buzzing alarm module
Ring alarm issues alarm signal to teacher, prompts to take flash disk away, to solve problems of the prior art.
Further, in the technical solution disclosed in the embodiment of the present invention, designed flash disk warning device be can be used as solely
Vertical device is pasted onto the outside of flash disk, physical damage will not be carried out to existing flash disk, to improve the versatility of device.
In use, the extremely push-and-pull lid institute of horizontal plane where the flash disk socket in the integrated console of multimedia platform
It is usually smaller in the distance of horizontal plane, generally less than 50cm.Therefore, this just proposes the Range resolution performance of designed device
Higher requirement.Technical solution in order to improve the Range resolution performance of set counter device, disclosed in the embodiment of the present invention
In, pulse signal caused by the wireless pulse transmitting module is linear FM signal f (t), it may be assumed that
Wherein, a (t) is the envelope signal of the linear FM signal, ω0It is the angular frequency of the linear FM signal, T
It is the carrier cycle time, F is the linear frequency modulation factor, and t is time parameter.For general pulse signal, linear frequency modulation letter
Number have preferable distance resolution.
In the prior art, the envelope signal of radio signal is usually rectangular function signal；And this rectangular function letter
The secondary lobe component of number its frequency domain is larger, and signal energy centrality is poor, is unfavorable for fighting the noise jamming in transmission channel, thus
Reduce the reliability of signal transmission.
Preferably, in the technical solution disclosed in the embodiment of the present invention, the envelope signal a (t) uses long ball surface wave
Function signal.The function signal is compared with other envelope signals, at the same time under the conditions of bandwidth product, can to greatest extent by
The energy of signal concentrates in signal bandwidth, compared with prior art, so that the pulse signal that the device made is emitted has
Preferable encircled energy improves the anti-interference ability of signal and the reliability of signal transmission.
By theoretical and analysis of simulation experiment, for prolate spheroidal wave functions signal, when its time-bandwidth product factor is greater than 4.2
When π, characteristic value is close to 1, to make it have higher signal energy concentration degree.Further, 0 rank and 1 rank long ball surface wave
Function signal has single peak characteristic, is more advantageous to the transmission of pulse signal, complete design requirement.It is preferred, therefore, that in this hair
In technical solution disclosed in bright embodiment, the envelope signal of the linear FM signal is that the time-bandwidth product factor is greater than 4.2 π
0 rank or 1 rank prolate spheroidal wave functions signal.
Further, in the technical solution disclosed in the embodiment of the present invention, the range finder module is sent out according to wireless pulse
Penetrate transmitting pulse signal and the wireless pulse receiving module that module coupled received reflected impulse signal difference on the frequency with
And the linear frequency modulation factor, the time parameter in wireless pulse round-trip transmission path is calculated, to obtain the wireless pulse
Transmitting module is the distance between to pulse-echo plane.
In technical solution disclosed in the embodiment of the present invention, the letter of pulse caused by the wireless pulse transmitting module
It number is linear FM signal f (t), the frequency of emitted pulse signal is changed according to linear rule, i.e.,
Therefore, the value size of linear frequency modulation factor F will affect the frequency variation speed of linear FM signal.In this programme
In, frequency variation is faster, and wireless pulse transmitting module is coupled transmitting pulse signal and wireless pulse receiving module institute
The difference on the frequency of received reflected impulse signal is bigger, and distance resolution is stronger.And the application scenarios of apparatus of the present invention
It is the multimedia platform in classroom, horizontal plane where flash disk socket and the distance between horizontal plane where push-and-pull lid are smaller.Therefore,
This requires disclosed schemes, and the resolution capability for measurement of adjusting the distance wants relatively high, is otherwise easy to produce mistake, to generate void
Alert signal.However, the value of linear frequency modulation factor F is not to be the bigger the better, when its value is larger, the range finder module can be made
Hardware realization complexity it is higher.Therefore, it is necessary in two aspect compromises of Range resolution performance and hardware realization complexity.
In technical solution disclosed in the embodiment of the present invention, the wireless pulse transmitting module and wireless pulse are connect
It receives module and is all made of extensive logical device realization, complete to count required for signal sampling point in implementation complexity and unit time
Calculation amount is related.In this scenario, hardware realization complexity can be measured with completing multiply additional calculation (MAC) time 1 time, it and carry
The real multiplications for needing to complete in the wave period time are related with the number of real addition.Pass through theory analysis and emulation, radio
Relation curve such as Fig. 2 institute of the implementation complexity of impulse ejection module and wireless pulse receiving module and linear frequency modulation factor F
Show.
Through simulation result shown in analysis chart 2 it is found that when the value of linear frequency modulation factor F is greater than 18.5,1 multiply-add method meter
Calculation (MAC) time is reduced to 10 by the 1ns order of magnitude-1The ns order of magnitude, so that more stringent requirements are proposed to hardware realization complexity.
Therefore, the value of linear frequency modulation factor F should be less than being equal to 18.5.
In technical solution disclosed in the embodiment of the present invention, the measurement accuracy and chirp pulse signal of range finder module
Linear frequency modulation factor F it is related, F value is bigger, and measurement accuracy is higher.For system design, as long as can satisfy system
Design objective.In system disclosed in the embodiment of the present invention, when measurement accuracy is 10-2Meter Shi, it will be able to decline to a great extent
False-alarm probability meets design requirement.By theory analysis and emulation, the relation curve of range accuracy and linear frequency modulation factor F are such as
Shown in Fig. 3.
By simulation result shown in analysis chart 3 it is found that range accuracy is by dividing when the value of linear frequency modulation factor F is greater than 15
The rice order of magnitude is promoted to centimetre scale, meets system design objective requirement.Therefore, the value of linear frequency modulation factor F should be greater than
Equal to 15.
In conclusion in order to meet the requirement of the range accuracy of system, while the hardware realization complexity of system is reduced, preferably
, in the technical solution disclosed in the embodiment of the present invention, the value range of linear frequency modulation factor F is more than or equal to 15 and to be less than
Equal to 18.5.
Further, in the technical solution disclosed in the embodiment of the present invention, the wireless pulse receiving module is received
By reflective surface return pulse signal be the 1st arrival wireless pulse receiving module pulse signal, to avoid causing
Mistake range measurement.
Preferably, in the technical solution disclosed in the embodiment of the present invention, the power module is provided with switch.It is using
In the process, when the flash disk socket progress classroom for needing for flash disk to be inserted into multimedia platform is given lessons, the power switch is opened；It gives lessons
It finishes, closes the power switch.
Preferably, in the technical solution disclosed in the embodiment of the present invention, the wireless pulse transmitting module is emitted
The centre frequency of pulse signal is 4.3GHz.The frequency band signals make generated pulse signal that there is the transmitting of more preferable signal to refer to
Tropism reduces false-alarm probability to realize accurate range measurement.
In the prior art, SAW device and voltage controlled oscillator can be used in the generation device of linear FM signal.Phase
For SAW device, the frequency stability of linear FM signal caused by voltage controlled oscillator is more preferable, is more suitable for short
Range measurement, to improve the reliability of flash disk alarm.It is preferred, therefore, that the technical solution disclosed in the embodiment of the present invention
In, the generation device of the linear FM signal is voltage controlled oscillator.
Although the embodiments of the present invention have been disclosed as above, but its is not only in the description and the implementation listed
With.It can be applied to various suitable the field of the invention completely.It for those skilled in the art, can be easily
Realize other modification.Therefore without departing from the general concept defined in the claims and the equivalent scope, the present invention is simultaneously unlimited
In specific details and legend shown and described herein.
Claims (8)
1. a kind of flash disk warning device for classroom multimedia platform, it is provided with flash disk socket in the multimedia platform,
Top is provided with the push-and-pull lid for being used to open or closing the multimedia platform, which is characterized in that the flash disk warning device
It is pasted onto the outside of flash disk, including wireless pulse transmitting module, wireless pulse receiving module, range finder module, alarm distance
Judgment module, buzzing alarm module, power module, wherein
Wireless pulse transmitting module: it is used to emit wireless pulse signal and is coupled to wireless pulse receiving module, when
When being provided with the flash disk of flash disk warning device and being inserted into the flash disk socket of the multimedia platform, the hair of the wireless pulse signal
It is vertical with the multimedia platform top levels and upward to penetrate direction；
Wireless pulse receiving module: it is used to receive the pulse that the wireless pulse transmitting module being reflected back toward is emitted
Signal, and export to range finder module；
Range finder module: its pulse signal feature emitted according to wireless pulse transmitting module and wireless pulse receive mould
The received pulse signal feature of block institute calculates the distance of wireless pulse transmitting module to pulse-echo face, and exports to report
Alert distance judgment module；
Alarm distance judgment module: it presets alarm distance thresholding, and with the calculated distance of the range finder module institute into
Row compares, if the calculated distance of range finder module institute is less than or equal to alarm distance thresholding, exports buzzing alarm starting
Otherwise signal is not exported to buzzing alarm module；Wherein, the alarm distance threshold value is inserted for the multimedia platform flash disk
The distance between horizontal plane where push-and-pull lid at the top of horizontal plane to the multimedia where mouthful；
Buzzing alarm module: it is used to receive the alarm enabling signal of buzzing caused by alarm distance judgment module, and according to this
Signal issues buzzing alarm；
Power module: it is used to provide power supply.
2. the flash disk warning device according to claim 1 for classroom multimedia platform, which is characterized in that described wireless
Pulse signal caused by electric pulse transmitting module is linear FM signal f (t), it may be assumed that
Wherein, a (t) is the envelope signal of the linear FM signal, ω0It is the angular frequency of the linear FM signal, T is to carry
Wave period time, F are the linear frequency modulation factors, and t is time parameter；The envelope signal a (t) is prolate spheroidal wave functions signal；Institute
The value range for stating linear frequency modulation factor F is more than or equal to 15 and to be less than or equal to 18.5.
3. the flash disk warning device according to claim 1 for classroom multimedia platform, which is characterized in that described wireless
Electric pulse receiving module the received pulse signal returned by reflective surface be the 1st arrival wireless pulse receiving module
Pulse signal.
4. the flash disk warning device according to claim 1 for classroom multimedia platform, which is characterized in that the power supply
Module is provided with switch.
5. the flash disk warning device according to claim 2 for classroom multimedia platform, which is characterized in that the ranging
Transmitting pulse signal and wireless pulse the receiving module institute that module is coupled according to wireless pulse transmitting module are received anti-
The difference on the frequency and the linear frequency modulation factor for penetrating pulse signal, calculate the time parameter in wireless pulse round-trip transmission path, from
And the wireless pulse transmitting module is obtained the distance between to pulse-echo plane.
6. the flash disk warning device according to claim 2 for classroom multimedia platform, which is characterized in that described linear
The envelope signal of FM signal is 0 rank of the time-bandwidth product factor greater than 4.2 π or 1 rank prolate spheroidal wave functions signal.
7. the flash disk warning device according to claim 2 for classroom multimedia platform, which is characterized in that described wireless
The centre frequency of the emitted pulse signal of electric pulse transmitting module is 4.3GHz.
8. the flash disk warning device according to claim 2 for classroom multimedia platform, which is characterized in that described linear
The generation device of FM signal is voltage controlled oscillator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810318654.7A CN110363969B (en) | 2018-04-11 | 2018-04-11 | USB flash disk alarm device for classroom multimedia platform |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810318654.7A CN110363969B (en) | 2018-04-11 | 2018-04-11 | USB flash disk alarm device for classroom multimedia platform |
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| CN201810318654.7A Expired - Fee Related CN110363969B (en) | 2018-04-11 | 2018-04-11 | USB flash disk alarm device for classroom multimedia platform |
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