The interference system of thief-proof playbackTechnical field
The present invention relates to a kind of signal interference system, and in particular to the interference system of thief-proof playback.
Background technology
Nowadays, either expanding economy, or the fierceness of domestic and international market are striven unexpectedly, and information security all plays decisiveEffect.Especially security assurance information is increasingly dependent in production, business and innovation area, success and the development of corporate operationThe constantly improve of work.It can be said that information security concerns each national vital interests.The information environment for creating safety is existingFor the indispensable condition of social development, because the every field in country specific activity all suffers from various security threats.
It is well known that information can become raw material, product or service, correctly using information can bring interests on material andBenefit.Therefore, the owner of each information pays special attention to information security, pays attention to keeping secret, and establishes and perfect information is protectedSystem, in order to avoid accessed and stolen by hacker.Hacker is probably a people, it is also possible to a tissue.They are interested be asWhat obtains secret information.The ubiquitous spy in the world today steals economic information, military information, political affairs by various secret meansInformation and scientific and technological information are controlled, by being used after analysis.With the development of market economy and the popularization of internet, belonged in the pastIn many equipment of intelligence department's control, all have spread to now in society.
Technology path is included with two kinds of frequency acoustic jamming and electromagnetic interference used by recording shielding at present.Wherein, togetherThe shortcomings that frequency acoustic jamming is directly disturbed using audio signal, and interference effect is preferable, but maximum is that have audible noise, Yong HubiMust wear and earphone or voice communication be carried out in shielding house, limitation is too big, can only under some more special occasions abilityUse, this method is restricted by environmental condition, while can also give people to bring interference and inconvenience, and user can not receive.And radiateConflicting mode then disturbs sound pick-up outfit using frequency electromagnetic waves, and interference, the latter can be realized in the case of asonantIt is mainly for old-fashioned sound pick-up outfit, such as cassette recorder, analog recording pen.For some new-type sound pick-up outfits, such asMobile phone, digital recording pen etc., its interference effect is extremely limited, so that cause that overlay device type is few, shield effectiveness is poor, practicalityThe problems such as not strong.Therefore existing shielding product can not preferably meet existing demand.
The content of the invention
The technical problems to be solved by the invention are that therefore existing shielding product can not preferably meet existing demand,Purpose is the interference system for providing thief-proof playback, and existing need can not preferably be met by solving therefore existing shielding productThe problem of asking.
The present invention is achieved through the following technical solutions：
The interference system of thief-proof playback, including sender unit and the modulation mould that is connected on sender unitBlock, the modulation module also passes sequentially through encryption processing module and random number generator is connected with field controller, the scenePower module and electromagnetic wave generator matched with modulation module, supersonic generator are also associated with controller；
Electromagnetic wave generator：The trigger signal that field controller is sent is received, generation electromagnetic wave signal is sent to modulation mouldBlock；
Supersonic generator：The trigger signal that field controller is sent is received, generation ultrasonic signal is sent to modulation mouldBlock；
Random number generator：The trigger signal that field controller is sent is received, one group of random sequence of generation is sent to encryptionProcessor；
Encryption processor：Receive the random sequence that random number generator is sent to be encrypted, the encryption data of generation is sent outIt is sent to modulation module；
Modulation module：The encryption data that encryption processor is sent is received, electromagnetic wave generator is sent according to encryption dataElectromagnetic wave signal and supersonic generator send ultrasonic signal be modulated, by modulated signal be sent to signal hairInjection device；
Field controller：After powering on, trigger signal is sent to random number generator, electromagnetic wave generator and ultrasonic waveGenerator.
System produces random sequence with random number generator, computing is encrypted to it using encryption processor, after encryptionSequence pair electromagnetic wave generator and the radio frequency that sends of supersonic generator and ultrasonic signal be modulated, producing has and can not answerFormer, noiseless and aliasing interference signal, the signal disturb sound collection equipment, are blocked so as to fulfill recording.Work is formerReason is：There are substantial amounts of electronic component, such as capacitance, resistance, IC in electronic equipment, when these electronic components be exposed to compared with, can absorption of electromagnetic energy in strong electromagnetic field.For sound pick-up outfit, on the one hand, electromagnetic energy can pass through sound pick-up outfitTransducer, the medium such as power cord be coupled to inside sound pick-up outfit, destroy the electronic functionalities of its front end.Meanwhile recording is setCylindrical conductor in standby, such as metal lead wire, metal connector, and the loop being made of metallic conductor, such as the circuit of pcb boardDeng can form inductive voltage and current in the electromagnetic field of alternation, sensitive electronic device is impacted.On the other hand,Electromagnetic energy can invade the inside of sound pick-up outfit by the gap or hole of sound pick-up outfit, into the electromagnetism inside equipmentPulse by directly irradiation inside electronic component, such as various transistors, integrated circuit, chip, comparator, operational amplifierDeng.So as to produce stronger immediate current or higher transient voltage.This product realizes that technology path is to use a kind of functionProperty interference source realizes that the interference to recording is blocked.Intercept unit of recording produces radio frequency, multifrequency and ultrasonic signal, realizes to recordThe direct interference of sound equipment, reaches the effect that recording failure or recording effect reduce.
The power module uses lithium battery.The limitation of fixed power source has been broken away from using lithium battery power supply, has made it using moreThere is flexibility.
Trigger module is additionally provided with the field controller.Trigger module uses audio-switch, when having detected soundWhen turn on field controller, control field controller is started to work, and the power supply of field controller is disconnected in no sound, is savedElectricity consumption, extends usage time.
It is also associated with being arranged on the indicator light of equipment surface on the field controller.Due to ultrasonic wave and electromagnetic wave people allIt is detectable, therefore, user can only judge the working status of equipment by being arranged on the indicator light of equipment surface.
Compared with prior art, the present invention have the following advantages and advantages：
1st, the interference system of the thief-proof playback of the present invention, the system use the mixing perturbation technique that high frequency low-frequency phase combines,High-frequency Interference carries out the interference of electromagnetic radiation from the angle of electronic device EMC, disturbs its normal work；Low-frequency disturbance is from being mixed into originalThe angle of voice signal, there is provided a kind of vox capitis signal, and this voice signal is similarly not heard sound；Low-and high-frequency is combinedTechnology, compensate for the situation that the single High-frequency Interference technology speech ciphering equipment perfect to some electronic shields can not disturb, and haveThe amount of electromagnetic radiation for reducing single High-frequency Interference of effect, makes product more environmentally-friendly；
2nd, the interference system of the thief-proof playback of the present invention, this product is static during the work time, noiseless, division operation person's promptingOutside, without any other discernable part, and the cooperation and camouflage of environment can be carried out according to surrounding environment, there is high security.
Brief description of the drawings
Attached drawing described herein is used for providing further understanding the embodiment of the present invention, forms one of the applicationPoint, do not form the restriction to the embodiment of the present invention.In the accompanying drawings：
Fig. 1 is present system structure diagram.
Embodiment
For the object, technical solutions and advantages of the present invention are more clearly understood, with reference to embodiment and attached drawing, to thisInvention is described in further detail, and exemplary embodiment of the invention and its explanation are only used for explaining the present invention, do not makeFor limitation of the invention.
Embodiment 1
As shown in Figure 1, the interference system of the thief-proof playback of the present invention, including sender unit are launched with signal is connected toMC1496 modulation modules on device, the modulation module also pass sequentially through AT89S51 encryption processing modules and STM32 random numbersMaker is connected with iMx.8 field controllers, and power module is also associated with the field controller and is matched with modulation moduleLC electromagnetic wave generators, RC supersonic generators；System produces random sequence with random number generator, using encryption processorIt is encrypted computing, the radio frequency and ultrasonic signal that encrypted sequence pair electromagnetic wave generator and supersonic generator are sentBe modulated, produce have can not restore, noiseless and aliasing interference signal, which disturbs sound pick-up outfit so thatRealize that recording is blocked.Operation principle is：There are substantial amounts of electronic component, such as capacitance, resistance, IC in electronic equipment, when thisA little electronic components are exposed in stronger electromagnetic field, can absorption of electromagnetic energy.For sound pick-up outfit, on the one hand, electromagnetismEnergy can be coupled to inside sound pick-up outfit by mediums such as the transducer of sound pick-up outfit, power cords, destroy the electronics of its front endFunctions of the equipments.Meanwhile the cylindrical conductor in sound pick-up outfit, such as metal lead wire, metal connector, and be made of metallic conductorThe circuit of loop, such as pcb board, can form inductive voltage and current in the electromagnetic field of alternation, to sensitive electronic deviceImpact.On the other hand, electromagnetic energy can invade the inside of sound pick-up outfit by the gap or hole of sound pick-up outfit,Into the electromagnetic pulse inside equipment by the internal electronic component of directly irradiation, as various transistors, integrated circuit, chip,Comparator, operational amplifier etc..So as to produce stronger immediate current or higher transient voltage.This product realizes technologyRoute is to realize that the interference to recording is blocked using a kind of feature interference source.Record intercept unit produce radio frequency, multifrequency andUltrasonic signal, realizes the direct interference to sound pick-up outfit, reaches the effect that recording failure or recording effect reduce.The electricitySource module uses lithium battery.The limitation of fixed power source is broken away from using lithium battery power supply, using it more has flexibility.It is described existingTrigger module is additionally provided with the controller of field.Trigger module uses audio-switch, and field control is turned on when having detected soundDevice, control field controller are started to work, and the power supply of field controller are disconnected in no sound, using electricity wisely, extends and useTime.It is also associated with being arranged on the indicator light of equipment surface on the field controller.Since ultrasonic wave and electromagnetic wave people are all examinedFeel less than therefore, user can only judge the working status of equipment by being arranged on the indicator light of equipment surface.
Electromagnetic wave generator：The trigger signal that field controller is sent is received, generation electromagnetic wave signal is sent to modulation mouldBlock；
Supersonic generator：The trigger signal that field controller is sent is received, generation ultrasonic signal is sent to modulation mouldBlock；
Random number generator：The trigger signal that field controller is sent is received, one group of random sequence of generation is sent to encryptionProcessor；
Encryption processor：Receive the random sequence that random number generator is sent to be encrypted, the encryption data of generation is sent outIt is sent to modulation module；
Modulation module：The encryption data that encryption processor is sent is received, electromagnetic wave generator is sent according to encryption dataElectromagnetic wave signal and supersonic generator send ultrasonic signal be modulated, by modulated signal be sent to signal hairInjection device；
Field controller：After powering on, trigger signal is sent to random number generator, electromagnetic wave generator and ultrasonic waveGenerator.
Above-described embodiment, has carried out the purpose of the present invention, technical solution and beneficial effect furtherDescribe in detail, it should be understood that the foregoing is merely the embodiment of the present invention, be not intended to limit the present inventionProtection domain, within the spirit and principles of the invention, any modification, equivalent substitution, improvement and etc. done, should all includeWithin protection scope of the present invention.