CN201118718Y - A mobile phone ultrasonic theft prevention device - Google Patents
A mobile phone ultrasonic theft prevention device Download PDFInfo
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- CN201118718Y CN201118718Y CNU2007200740745U CN200720074074U CN201118718Y CN 201118718 Y CN201118718 Y CN 201118718Y CN U2007200740745 U CNU2007200740745 U CN U2007200740745U CN 200720074074 U CN200720074074 U CN 200720074074U CN 201118718 Y CN201118718 Y CN 201118718Y
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Abstract
Disclosed is a mobile phone ultrasonic anti-theft device comprising a portable ultrasonic alarm and a micro-frequency converter embedded into a chip in a mobile phone; a singlechip control system is arranged in the portable ultrasonic alarm and is connected with a clock circuit, a reset circuit, an ultrasonic transmitter, an ultrasonic receiver and an alarm respectively through pins; and an ultrasonic receiving circuit is connected by a capacitor C4, a resistor R3 and a 74LS14 Schmitt comparator in parallel, and the output end thereof is connected to a singlechip interface in parallel. The micro-frequency converter is composed of an ultrasonic receiver, a frequency changing circuit and an ultrasonic transmitter; the frequency changing circuit includes a D trigger, the output end of the ultrasonic receiving circuit is connected with a CLK port of the D trigger, the D port is connected with the Q port, and the output end of the Q port is connected with the ultrasonic transmitter; and the control system is implemented by the programming of the singlechip so as to control the ultrasonic transmitter, the alarm and a timer. The ultrasonic anti-theft device has a simple structure and can guard against theft and prevent forgetting the mobile phone.
Description
Technical field
The utility model relates to anti-stealing device for handset, is specifically related to a kind of ultrasonic anti-stealing device for mobile phone that utilizes the ultrasonic wave principle design.
Background technology
At present mobile phone has become the means of communication that people generally use, and mobile phone forgets and carry that perhaps lose, stolen etc. often taken place.People thirst for that an alarm set is arranged, or burglar alarm.The high-end commercial mobile phone of the part of Xiao Shouing on the market, mainly employing data of e-commerce antitheft mobile phone passback formula as the exploitation of group of Hi-Tech Wealth, promptly behind hand-set from stolen, detecting during start is undelegated sim card (not being your card), mobile phone will send all information in the mobile phone from your predefined phone number of trend, this is to have become the automatic operation of carrying out under the situation of the fact at hand-set from stolen, can not in time send any signal to antitheft mobile phone, only the information theft-preventing in the mobile phone be played certain preventive effect; Chinese invention patent discloses a kind of " anti-stealing device for handset ", application number: 01114365.7, the applying date: 20010720, this device is to utilize Leather cover for handset to be provided with the subassembly wrapper that links to each other with mobile phone, be provided with warning circuit in the subassembly wrapper, play antitheft effect, but the weak point of this device is that it is an all-in-one, do not have truly identification and anti-theft feature, owner takes out mobile phone in the cell-phone cover and also can give the alarm, cause many inconvenience, and in a single day stealer is understood its structure and is still had opportunity.Up to the present, yet there are no any device about other antitheft mobile phones.
Summary of the invention
The utility model discloses a kind of ultrasonic anti-stealing device for mobile phone, its purpose is to overcome in the prior art, can not send any information or calling when commercial mobile phone is stolen, but only data passback, and patent of invention " anti-stealing device for handset " is an all-in-one with mobile phone, report to the police in case just separate, owner uses mobile phone also can report to the police, and does not have truly identification and anti-theft feature.The utility model utilizes the principle that ultrasonic wave can measuring distance, design a mobile phone ultrasonic wave burglar alarm, alarm is contained in owner's pocket, and this device separates with mobile phone, when mobile phone and human body distance greater than the scope of setting system alarm then, thereby realize the antitheft mobile phone purpose.
The technical solution of the utility model is: by carrying a terminal system substantially, this system's collection ultrasonic wave emission receives, timing, and warning and control system are called the portable supersonic alarm in one.Single-chip computer control system is measured the distance of mobile phone and human body by calculating ultrasonic pulse emission and the time difference of accepting.Be embedded in miniature frequency converter with its frequency f=XHz of portable supersonic alarm ultrasonic waves transmitted pulse at mobile phone, frequency conversion X/2Hz, launch its frequency f=X/2Hz of ultrasonic pulse after the frequency conversion simultaneously, the frequency conversion effect can make the ultrasonic wave f=x Hz of this frequency ultrasonic wave and wall or other barrier reflected backs be distinguished, effectively remove useless noise signal, really accomplished zero wrong report.Receive only hyperacoustic while of frequency f=X/2Hz at the receiving terminal of the portable supersonic alarm that guarantees to accept frequency, utilize the hyperacoustic emission of Single-chip Controlling, and to the ultrasonic wave spontaneous emission to the timing that receives two-way time, calculate the distance L=CT/2 of mobile phone and portable supersonic alarm, C is the propagation velocity 340m/s of ultrasonic wave in atmosphere, and T is the time difference with received signal of transmitting.Thereby give the alarm by judgement, reach antitheft purpose both variable in distance.
A kind of ultrasonic anti-stealing device for mobile phone is characterized in that:
A) it includes portable supersonic alarm of carrying and the miniature frequency converter that embeds the mobile phone inside chip;
B) in the portable supersonic alarm single-chip computer control system is arranged, by each pin respectively with clock circuit, reset circuit, ultrasonic transmitter, ultrasonic receiver is connected with alarm; Ultrasonic receiver is connected with the ultrasonic wave receiving circuit, and the ultrasonic wave receiving circuit is composed in parallel by capacitor C 4, resistance R 3 and 74LS14 Schmidt comparator, and output is also received interface microcontroller.
C) miniature frequency converter is made up of ultrasonic receiver, ultrasonic wave receiving circuit, frequency changer circuit and ultrasonic transmitter; Ultrasonic receiver is connected with the ultrasonic wave receiving circuit, and the ultrasonic wave receiving circuit is composed in parallel by capacitor C 3, resistance R 1 and 74LS14 Schmidt comparator, and the output of circuit is also received interface microcontroller; Frequency changer circuit comprises a d type flip flop, and the output of ultrasonic wave receiving circuit is connected with the CLK of d type flip flop end, and the D port links to each other with the Q end, and the output of Q end is connected with ultrasonic transmitter;
D) control system control ultrasonic transmitter, alarm and timer; Control system is realized by mcu programming.
Portable supersonic alarm ultrasonic signal frequency is f=XHz, be transmitted into the ultrasonic receiver of miniature frequency converter by ultrasonic transmitter after, through shaping, filtering, frequency division, frequency is f=X/2Hz, and the ultrasonic receiver of portable supersonic alarm receives only the ultrasonic wave that frequency is f=X/2Hz.
The utility model ultrasonic anti-stealing device for mobile phone embeds the miniature frequency converter of mobile phone inside chip and is powered by cellular phone power supplies; The portable supersonic alarm of carrying is powered by the 5V button cell.
For preventing the different identical ultrasonic waves of mobile phone emission, the phase mutual interference, the utility model device needs to use one to one, program decision when ultrasonic transmitter tranmitting frequency f=x (Hz) can be dispatched from the factory by the portable supersonic alarm in the single-chip microcomputer, in order to guarantee that every ultrasonic anti-stealing device for mobile phone does not disturb in use mutually, can give different tranmitting frequency X values when every table apparatus is carried out mcu programming realizes, because the ultrasonic receiver that this device uses has identifiability to frequency interval more than 100Hz, so giving the X assignment is (40+100i) KHz, (i=0,1,2,3,4 ...).Because the ultrasonic transmitter tranmitting frequency between tens MHZ, so the i value can be taken to hundreds of thousands, therefore has two hyperacoustic probability of mobile phone ultrasonic transmitter emission same frequency extremely low at 40KHz, be approximately zero.The real uniqueness that realizes every ultrasonic anti-stealing device for mobile phone is not disturbed during use mutually.
The beneficial effects of the utility model are: warning device can separate with mobile phone, when separating distance greater than set safe distance the time, alarm gives the alarm, and the mobile phone that ultrasonic anti-stealing device is installed is not only antitheft, and can prevent effectively that mobile phone from forgeing, simple in structure easy to use.
Description of drawings
A kind of ultrasonic anti-stealing device for mobile phone theory diagram of Fig. 1;
Fig. 2 is the minimum system and the external circuits figure of 89C51 single-chip microcomputer;
The miniature converter plant circuit diagram of Fig. 3;
Fig. 4 Single Chip Microcomputer (SCM) system working procedure block diagram.
1. clock circuit, 2. reset circuit, 3.89C51 single-chip microcomputer, 4. ultrasonic transmitter, 5. ultrasonic wave receiving circuit, 6. ultrasonic receiver, 7. alarm, 8. frequency changer circuit.
Embodiment
Below in conjunction with drawings and Examples the utility model is described in detail.But present embodiment is not limited to the utility model, and every employing analog structure of the present utility model and similar variation thereof all should be listed protection range of the present utility model in.
Present embodiment is selected the 89C51 single-chip microcomputer for use, and the frequency conversion frequency is f=X/2Hz.
A kind of ultrasonic anti-stealing device for mobile phone, include portable supersonic alarm of carrying and the miniature frequency converter that embeds the mobile phone inside chip, operation principle as shown in Figure 1, the ultrasonic pulse that has characteristic frequency f=x (Hz) by the emission of the ultrasonic transmitter in the portable supersonic alarm, the miniature frequency converter that embeds the mobile phone end receive the ultrasonic pulse of its characteristic frequency f=x (Hz) and by frequency conversion system through shaping, filtering, to receive frequency shift behind the frequency division to f=x/2 (Hz), send the ultrasonic pulse of f=x/2 (Hz) frequency again by the ultrasonic transmitter of miniature frequency converter; The ultrasonic receiver 6 of portable supersonic alarm, behind shaping filter, will detect the ultrasonic pulse that frequency is f=x/2 (Hz), be converted to the signal of telecommunication, send into 89C51 single-chip microcomputer 3, begin transmitted pulse to the time difference Δ t that receives pulse by the single-chip microcomputer analysis, simultaneously Δ t is sent to control system and judges.Shown in Fig. 4 microcomputer working plan, when time difference Δ t＞t (t is a preset value), then control system starts alarm 7 and gives the alarm, as time difference Δ t＜t, then control system start supersonic generator once more tranmitting frequency be the ultrasonic wave of f=x (Hz).
In the portable supersonic alarm single-chip computer control system is arranged, the minimum system of 89C51 single-chip microcomputer and external circuits figure are as shown in Figure 2, the 89C51 single-chip microcomputer by each pin respectively with clock circuit 1, reset circuit 2, ultrasonic transmitter 4, ultrasonic receiver 6, alarm 7 connects; Ultrasonic receiver 6 is connected with ultrasonic wave receiving circuit 5, and the ultrasonic wave receiving circuit is composed in parallel by capacitor C 4, resistance R 3 and 74LS14 Schmidt comparator, and output is also received single-chip microcomputer P1.1 interface; Clock circuit 1:XTAL is the crystal oscillator generator, and trimming capacitor C 1, C2 constitute inner concussion, and producing frequency is the clock pulse of 12MHZ, and by XTAL1, the XTAL2 pin inserts single-chip microcomputer, for single-chip microcomputer provides working pulse; Reset circuit 2: reset switch provides the hand-reset mode, when pressing down switch S 1, and diode D1 shinny (whether the prompting user really presses down switch), capacitor C 5 is by resistance R 2 chargings, and at this moment, RST brings out existing high level, when the lasting 20ms of high level is above, single-chip microcomputer is resetted; Ultrasonic transmitter 4 is converted to acoustic signals to electric impulse signal, be transmitted to the ultrasonic receiver of miniature frequency converter, ultrasonic receiver is converted to electric impulse signal to acoustic signals, through frequency conversion behind the ultrasonic wave receiving circuit, directly insert the P1.1 port after the shaping of the signal process 74LS14 comparator that returns and the filtering of RC filter, filter can filter noise signal by the value of adjusting R and C, and making the P1.1 receiving terminal receive only frequency is half ultrasonic signal of tranmitting frequency; Alarm 7 is boom units, and by Single Chip Microcomputer (SCM) program control, when high level appearred in P1.2, buzzer began to pipe.
Miniature converter plant circuit diagram as shown in Figure 3, frequency changer circuit 8: form by a d type flip flop, the CLK end of the electric impulse signal input d type flip flop of ultrasonic wave receiving circuit 5 outputs, the D end links to each other with the Q end, as CLK during whenever to a rising edge level, the level of Q end will change once, makes the signal frequency of Q end output end signal frequency ratio CLK end dwindle one times, realized frequency conversion function, the output signal of Q end is launched acoustic signals after the frequency conversion by ultrasonic transmitter 4 then.
After loading onto battery, at first press down reset switch and make system initialization, Single Chip Microcomputer (SCM) system just brings into operation, the Single Chip Microcomputer (SCM) system working procedure is shown in Fig. 4 block diagram: internal processes will wait for that the user resets the detection distance then, (distance L=1 that three buttons are determined respectively that on the control panel of portable supersonic alarm, have the button of three setting mobile phones and alarm distance L available, 2,3 meters), when as long as the user presses down any one button, program in the single-chip computer control system is scaled time t to the distance L of button correspondence, the program control ultrasonic transmitter begins to launch f=x (Hz) ultrasonic wave then, single-chip microcomputer picks up counting simultaneously, when the ultrasonic receiver of portable supersonic alarm receives return frequency when being the ultrasonic pulse of f=x/2 (Hz), single-chip microcomputer stops timing, obtain time difference Δ t, when Δ t＞t, then control system startup alarm 7 gives the alarm, as time difference Δ t＜t, then control system start ultrasonic transmitter once more tranmitting frequency be the ultrasonic wave of f=(Hz).
If when the user wants to reset mobile phone and alarm distance L, must press down earlier reset switch, allow the Single Chip Microcomputer (SCM) system initialization.
Claims (2)
1. ultrasonic anti-stealing device for mobile phone is characterized in that:
A) it includes portable supersonic alarm of carrying and the miniature frequency converter that embeds the mobile phone inside chip;
B) in the portable supersonic alarm single-chip computer control system is arranged, by each pin respectively with clock circuit, reset circuit, ultrasonic transmitter, ultrasonic receiver is connected with alarm; Ultrasonic receiver is connected with the ultrasonic wave receiving circuit, and the ultrasonic wave receiving circuit is composed in parallel by capacitor C 4, resistance R 3 and 74LS14 Schmidt comparator, and output is also received interface microcontroller
C) miniature frequency converter is made up of ultrasonic receiver, ultrasonic wave receiving circuit, frequency changer circuit and ultrasonic transmitter; Ultrasonic receiver is connected with the ultrasonic wave receiving circuit, and the ultrasonic wave receiving circuit is composed in parallel by capacitor C 3, resistance R 1 and 74LS14 Schmidt comparator, and the output of circuit is also received interface microcontroller; Frequency changer circuit comprises a d type flip flop, and the output of ultrasonic wave receiving circuit is connected with the CLK of d type flip flop end, and the D port links to each other with the Q end, and the Q output is connected with ultrasonic transmitter;
D) control system control ultrasonic transmitter, alarm and timer; Control system is realized by mcu programming.
2. a kind of ultrasonic anti-stealing device for mobile phone according to claim 1, it is characterized in that: portable supersonic alarm ultrasonic signal frequency is f=XHz, be transmitted into the ultrasonic receiver of miniature frequency converter by ultrasonic transmitter after, through shaping, filtering, frequency division, frequency is f=X/2Hz, and the ultrasonic receiver of portable supersonic alarm receives only the ultrasonic wave that frequency is f=X/2Hz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200740745U CN201118718Y (en) | 2007-08-24 | 2007-08-24 | A mobile phone ultrasonic theft prevention device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200740745U CN201118718Y (en) | 2007-08-24 | 2007-08-24 | A mobile phone ultrasonic theft prevention device |
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| Publication Number | Publication Date |
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| CN201118718Y true CN201118718Y (en) | 2008-09-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNU2007200740745U Expired - Fee Related CN201118718Y (en) | 2007-08-24 | 2007-08-24 | A mobile phone ultrasonic theft prevention device |
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| CN (1) | CN201118718Y (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101826242A (en) * | 2010-04-30 | 2010-09-08 | 杨占松 | Remote alarming and monitoring device |
| CN104902082A (en) * | 2015-05-07 | 2015-09-09 | 上海斐讯数据通信技术有限公司 | Theft-proof system and theft-proof method for mobile phone |
| CN107045760A (en) * | 2017-04-05 | 2017-08-15 | 攀枝花学院 | Intelligent anti-theft system |
| US11665538B2 (en) | 2019-09-16 | 2023-05-30 | International Business Machines Corporation | System for embedding an identification code in a phone call via an inaudible signal |
-
2007
- 2007-08-24 CN CNU2007200740745U patent/CN201118718Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101826242A (en) * | 2010-04-30 | 2010-09-08 | 杨占松 | Remote alarming and monitoring device |
| CN101826242B (en) * | 2010-04-30 | 2012-03-28 | 杨占松 | Remote alarming and monitoring device |
| CN104902082A (en) * | 2015-05-07 | 2015-09-09 | 上海斐讯数据通信技术有限公司 | Theft-proof system and theft-proof method for mobile phone |
| CN107045760A (en) * | 2017-04-05 | 2017-08-15 | 攀枝花学院 | Intelligent anti-theft system |
| US11665538B2 (en) | 2019-09-16 | 2023-05-30 | International Business Machines Corporation | System for embedding an identification code in a phone call via an inaudible signal |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080917 |