CN117254875B - Portable desk-top anti-recording device - Google Patents
Portable desk-top anti-recording device Download PDFInfo
- Publication number
- CN117254875B CN117254875B CN202311466072.0A CN202311466072A CN117254875B CN 117254875 B CN117254875 B CN 117254875B CN 202311466072 A CN202311466072 A CN 202311466072A CN 117254875 B CN117254875 B CN 117254875B
- Authority
- CN
- China
- Prior art keywords
- ultrasonic
- equipment
- circuit board
- power supply
- power
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000000523 sample Substances 0.000 claims abstract description 65
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims abstract description 12
- 230000000694 effects Effects 0.000 claims description 25
- 230000003321 amplification Effects 0.000 claims description 24
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 24
- 230000002265 prevention Effects 0.000 claims description 24
- 238000000034 method Methods 0.000 claims description 22
- 238000004891 communication Methods 0.000 claims description 18
- 238000013461 design Methods 0.000 claims description 17
- 238000006243 chemical reaction Methods 0.000 claims description 11
- 230000008859 change Effects 0.000 claims description 10
- 230000008569 process Effects 0.000 claims description 10
- 239000013078 crystal Substances 0.000 claims description 7
- 230000008713 feedback mechanism Effects 0.000 claims description 7
- 238000003780 insertion Methods 0.000 claims description 6
- 230000001788 irregular Effects 0.000 claims description 3
- 230000005389 magnetism Effects 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 9
- 238000010586 diagram Methods 0.000 description 16
- 230000006870 function Effects 0.000 description 8
- 230000009467 reduction Effects 0.000 description 8
- 238000001914 filtration Methods 0.000 description 6
- 238000012423 maintenance Methods 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000002604 ultrasonography Methods 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- DWDGSKGGUZPXMQ-UHFFFAOYSA-N OPPO Chemical compound OPPO DWDGSKGGUZPXMQ-UHFFFAOYSA-N 0.000 description 1
- 244000062793 Sorghum vulgare Species 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000010835 comparative analysis Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012458 free base Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 235000019713 millet Nutrition 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000008447 perception Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K3/00—Jamming of communication; Counter-measures
- H04K3/60—Jamming involving special techniques
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F7/00—Methods or arrangements for processing data by operating upon the order or content of the data handled
- G06F7/58—Random or pseudo-random number generators
- G06F7/582—Pseudo-random number generators
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K3/00—Jamming of communication; Counter-measures
- H04K3/40—Jamming having variable characteristics
- H04K3/42—Jamming having variable characteristics characterized by the control of the jamming frequency or wavelength
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K3/00—Jamming of communication; Counter-measures
- H04K3/80—Jamming or countermeasure characterized by its function
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Computational Mathematics (AREA)
- Mathematical Analysis (AREA)
- Mathematical Optimization (AREA)
- Pure & Applied Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The invention belongs to the technical field of electronic information, and particularly relates to a portable desk TYPE anti-recording device which comprises a clock adjustment touch key, an easy-to-get-and-put equipment placement groove, an equipment bin, a magnetic attraction device, an ultrasonic shielding probe fixing groove, a circuit board fixing hole, a device bottom plate fixing hole, a system working button, a system power-on button, a working indicator lamp, a power-on indicator lamp, a clock display screen, transparent acrylic, an equipment bin door opening, a TYPE-C charging port, a power supply unit, a shell device, an internal circuit board system and an ultrasonic shielding probe. The invention not only has remarkable innovation and breakthrough in the anti-recording technology, but also has excellent performance in the aspects of user experience and operation convenience, and is an excellent invention with practicability and technical properties.
Description
Technical Field
The invention relates to the technical field of electronic information, in particular to a portable desk type anti-recording device.
Background
At present, common shielding recording methods mainly comprise an electromagnetic interference and sound reverberation method: the electromagnetic interference method is to interfere with the normal operation of eavesdropping equipment by emitting electromagnetic waves of a specific frequency and intensity, however, this method requires specialized equipment and knowledge, and because many modern recording equipment is equipped with an anti-interference circuit, the practical effect of this method is limited; the sound reverberation rule is to add a specific sound source or white noise in the protected area to confuse eavesdropping devices, but this can interfere with normal operation and life and can lead to environmental noise problems.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a portable desk type anti-recording device, which solves the problems of large noise, complex installation and operation, incapability of observing the state of internal equipment in real time, limited actual shielding effect and the like in the prior art.
The invention adopts the following technical scheme for realizing the purposes:
a portable desk TYPE anti-recording device, which comprises a clock adjustment touch key, an easy-to-pick-and-place equipment placement groove, an equipment bin, a magnetic attraction device, an ultrasonic shielding probe fixing groove, a circuit board fixing hole, a device bottom plate fixing hole, a system working button, a system power-on button, a working indicator lamp, a power-on indicator lamp, a clock display screen, transparent acrylic, an equipment bin door opening, a TYPE-C charging port, a power supply unit, a shell device, an internal circuit board system and an ultrasonic shielding probe,
the clock adjustment touch key and the clock display screen are both positioned on the front side of the shell device, so that a user can conveniently view and adjust calendar and temperature and humidity information in real time; the clock adjusting touch key is positioned at the bottom of the clock display screen so as to correspondingly adjust according to the display content; the equipment bin is positioned in the central area inside the shell device, and the two sides of the equipment bin are provided with easy-to-take equipment placement grooves which are convenient for taking equipment, so that a user can access the mobile phone equipment more conveniently; the magnetic attraction device is arranged at four corners of the top of the shell device and is used for firmly adsorbing the cover on the device to prevent the cover from loosening or falling off accidentally in the use process; the ultrasonic shielding probe fixing grooves are arranged on two sides of the equipment bin so as to ensure that the ultrasonic shielding probe can be effectively aligned with and interfere with a radio system of the mobile phone equipment; the circuit board fixing holes and the device bottom plate fixing holes are distributed at the bottom of the shell device, and the internal circuit board system is firmly installed inside by double screws; the system working button, the system power-on button, the working indicator lamp and the power-on indicator lamp are all positioned on one side of the shell device and are arranged below the transparent acrylic, so that the operation of a user and the observation of the state of equipment are facilitated, and meanwhile, the appearance is kept clean; the transparent acrylic is arranged at the centers of two sides of the shell device, and the reasonable size design ensures that a user can clearly observe the state in the equipment bin and ensures the stability of the whole structure; the equipment bin door openings are positioned at the top of the shell device and are respectively arranged at the middle positions of the front side and the rear side, so that a user can more conveniently and easily operate the taking and placing of the magnetic cover; the TYPE-C charging port is arranged at the bottom of the rear side of the shell device, so that the charging operation of the equipment is facilitated; the power supply unit is positioned in the center of the internal circuit board system and provides stable power supply for the whole system;
the internal circuit board system is interfered by adopting an algorithm strategy combining nonlinear sweep frequency and frequency hopping, and complex change signals are generated, so that mobile phone equipment is difficult to capture;
the internal circuit board system comprises a power supply unit, a power supply control unit, a main control system, a voltage conversion unit, a wireless communication unit and an ultrasonic power amplification unit which are connected in sequence;
transparent acrylic is arranged at two sides of the shell device, three equipment bins are arranged in the shell device, three mobile phones or recording pens and other recording equipment can be placed in the shell device at the same time, and a clock display screen is arranged;
the ultrasonic shielding probes are ultrasonic transmitters arranged in an array and are detachably connected with the internal circuit board system.
Further, a short circuit prevention and overcurrent prevention device is arranged in the power supply unit, is fixed in the middle of the internal circuit board system, and is electrically connected with the internal circuit board system to supply power to the internal circuit board system.
Further, the power control unit includes system power-on button, system work button, TYPE-C charge mouth, power-on pilot lamp, work pilot lamp to fixed mounting is in the casing device outside, the TYPE-C charge mouth of power control unit both can charge for the power supply unit and can supply power for the entire system, when passing through TYPE-C charges mouthful connect external power source, this system supplies power through external power source, and charges for the power supply unit, when TYPE-C charges mouthful do not connect external power source, this system passes through power supply unit supplies power.
Further, the main control system comprises a program downloading interface, a crystal oscillator unit, a voltage reducing module and a main control chip, wherein the voltage reducing module is used for converting external power supply into V which is used for supplying power for the main control chip.
Further, the voltage conversion unit boosts the output voltage of the power supply unit to supply power to the ultrasonic power amplification unit.
Further, the wireless communication unit integrates a Wi-Fi module, so that the device can be connected to a wireless network of a home or an office, communication with a mobile phone is realized, remote control and device state checking are realized, and the device is further provided with a Bluetooth module, supports communication between the mobile phone and the device at a short distance, and is suitable for control at a short distance.
Further, the ultrasonic power amplification unit amplifies signals sent by the main control system and is used for driving the ultrasonic shielding probe to work.
Further, the ultrasonic shielding probe is detachably connected with the ultrasonic power amplification unit of the internal circuit board system in a direct-insertion mode and is fixed in the ultrasonic shielding probe fixing groove.
Further, the internal circuit board system is connected with the ultrasonic shielding probe, then is installed upwards from the bottom of the shell device, and then is connected and fixed with the circuit board fixing hole and the device bottom plate fixing hole through screws, so that the shell device is detachably connected with the internal circuit board system.
A method for using a portable desk type anti-recording device comprises the following steps,
s1, implementing nonlinear sweep frequency: the nonlinear sweep frequency is carried out in the designated frequency interval through the exponential algorithm, the complexity and shielding effect of the signal are improved by using the method, and the decoding difficulty of the recording equipment is increased, so that unauthorized recording is prevented more effectively.
S2, implementing frequency hopping: the pseudo random number generator is combined to carry out frequency hopping, unexpected frequency change is generated at a specific moment, and the interference effect on recording equipment is enhanced through the irregular frequency change, so that the stability and the safety of recording prevention are improved.
S3, dynamically generating PWM waves to interfere with each other: the frequency of the PWM wave is precisely generated and finely adjusted by utilizing the dynamic adjustment of a high-precision timer, a prescaler and a counter in the main control chip, so that the PWM wave meets the actual interference requirement, and the accuracy of interference is improved.
S4, dynamically adjusting a real-time feedback mechanism: the duty ratio of the PWM wave is dynamically adjusted according to a real-time feedback mechanism, and the intensity and the mode of the ultrasonic wave are optimized, so that the device can adaptively perform optimal sound recording interference prevention according to the actual environment and conditions.
Compared with the prior art, the invention provides a portable desk type anti-recording device, which has the following beneficial effects:
1. innovative ultrasonic sound-proof recording technology: the device adopts a unique and advanced nonlinear sweep frequency technology, a singlechip control system is utilized to generate a complex and difficult-to-predict signal mode, the sweep frequency technology combines nonlinear variation and frequency hopping technology, and can generate rich and complex signal modes by applying an exponential algorithm and a pseudo-random number generator.
2. Intelligent interaction design: the device has the intelligent interaction function, can be connected with a user mobile phone through the built-in wireless communication unit, supports remote control and equipment state inquiry, enables user operation to be more convenient, and simultaneously, for guaranteeing the safety of user data, the system also integrates an advanced safe encryption technology, and ensures the safety of user information in the transmission process.
3. User experience optimization: in the operation process, the noise of this device is controlled more outstanding, owing to adopted advanced ultrasonic technology for the device can greatly reduce human perception's noise when the operation, compare with traditional mechanical interference device, this device is quieter, help guaranteeing user's use experience, the device both sides have adopted the acrylic material of high transparency, make the user easily look over the inside state and the behavior of device, the whole toughness of device has also been strengthened simultaneously, the device still can real-time supervision and the humiture of display environment, satisfy user's daily use demand better.
4. Portability and applicability: the rechargeable lithium battery is arranged in the device, so that the device can be kept in normal operation under the condition that an external power supply is not required continuously, the applicability of the device in various environments is enhanced, the design of the device aims at simplifying and optimizing the whole size on the premise of ensuring the recording prevention effect in consideration of the size of a mobile phone on the market, the device is more fit with the actual use requirement of a user, the size of the device is carefully designed to be 22cm (long) 13.6cm (wide) 10.3cm (high), and the device is light, portable and convenient for the user to carry and move under different scenes.
Through the comprehensive embodiment of the beneficial effects, the invention not only obtains remarkable innovation and breakthrough in the anti-recording technology, but also has excellent performance in the aspects of user experience and operation convenience, and is an excellent invention with practicability and technical properties.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the present invention;
FIG. 2 is a schematic top view of the present invention;
FIG. 3 is a schematic rear view of the present invention;
FIG. 4 is a schematic diagram of the front view of the present invention;
FIG. 5 is a schematic view of the bottom view of the present invention;
FIG. 6 is a schematic view of the overall assembled internal structure of the present invention;
FIG. 7 is a schematic diagram of an assembled structure of the circuit board of the present invention;
FIG. 8 is a schematic diagram of undisturbed sound waves in an original recording environment;
FIG. 9 is an audio schematic diagram of a commercial anti-recording device in an operating environment;
FIG. 10 is a schematic diagram of a commercial anti-recording device in an environment where the audio is filtered to reduce noise;
FIG. 11 is an audio schematic of the device of the present invention in an operating environment;
FIG. 12 is a schematic diagram of filtered noise reduction in the environment in which the apparatus of the present invention is operating;
FIG. 13 is a graph showing the comparison of the effects of the anti-recording device of the present invention.
In the figure: 1. the clock adjusts the touch key; 2. the equipment is easy to take and put and is provided with a groove; 3. an equipment bin; 4. a magnetic attraction device; 5. an ultrasonic shielding probe fixing groove; 6. a circuit board fixing hole; 7. a device bottom plate fixing hole; 8. a system work button; 9. a system power-on button; 10. a work indicator light; 11. powering on an indicator lamp; 12. a clock display screen; 13. transparent acrylic; 14. an equipment bin gate opening; 15. A TYPE-C charging port; 16. an ultrasonic shielding probe; 17. a power supply unit; 18. a housing means; 19. an internal circuit board system.
Description of the embodiments
The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments, and all other embodiments obtained by those skilled in the art without making creative efforts based on the embodiments of the present invention are included in the protection scope of the present invention.
Examples
As shown in fig. 1-13, a portable desk top anti-recording device according to one embodiment of the present invention includes a housing assembly 18, an internal circuit board system 19, and an ultrasonic shielding probe 16;
the internal circuit board system 19 combines nonlinear frequency sweep and frequency hopping in a careful and scientific way, employing dynamically adjusted PWM waves, and mixed signal strategies to generate complex varying signals to achieve efficient shielding of the recording device.
1. The invention dynamically generates PWM waves with frequency variation:
a high-precision timer in the main control chip is utilized to ensure the stable output of PWM waves; dynamically adjusting the values of the prescaler and the counter, and finely adjusting the frequency of the PWM wave to realize nonlinear frequency sweep.
2. Precisely controlling the duty ratio of PWM waves:
dynamically adjusting a duty ratio register, and adjusting PWM wave output in real time to optimize the intensity and mode of ultrasonic waves; and a real-time feedback mechanism is implemented, the duty ratio is monitored and adjusted according to the requirement, and the optimal stability and shielding effect are ensured.
3. Integrating nonlinear sweep frequency and frequency hopping:
generating a nonlinear sweep frequency signal by using an exponential algorithm, wherein the nonlinear sweep frequency signal changes in a designated frequency interval so as to improve the complexity and shielding effect of the signal; generating frequency hopping by combining a pseudo-random number generator, and generating unexpected frequency change at a specific moment to further strengthen the interference effect; and a mixed signal output strategy is adopted to synthesize sweep frequency and jump signals and output more complex and variable interference signals.
4. Signal amplification and ultrasonic probe driving:
by the design of a professional driving circuit, the PWM signal is accurately amplified, so that perfect matching with the ultrasonic shielding probe 16 is ensured; the matched ultrasonic probes are selectively used to achieve the best ultrasonic emission and shielding effect.
The internal circuit board system 19 comprises a power supply unit 17, a power supply control unit, a main control system, a voltage conversion unit, a wireless communication unit and an ultrasonic power amplification unit which are connected in sequence;
the power supply unit 17 is used as an energy source provider of the system and is responsible for providing necessary electric energy for the whole anti-recording device, the power supply control unit is directly connected with the power supply unit 17, the electric energy provided by the power supply unit 17 is firstly managed and distributed by the power supply control unit, and the power supply control unit is responsible for monitoring and managing the power supply and ensuring the stable operation of all parts of the system.
The main control system is connected with the power supply control unit, and the power supply control unit receives the managed and adjusted electric energy; the main control system is used as a core of the whole device and is responsible for coordinating and controlling each functional unit of the device; the voltage conversion unit is directly connected with the main control system and performs necessary conversion and adjustment on the voltage according to the instruction of the main control system; the wireless communication unit is connected with the main control system, and the main control system performs external communication through the wireless communication unit, such as receiving a remote control instruction; the ultrasonic power amplification unit is connected with the main control system and the voltage conversion unit, the main control system controls the operation of the ultrasonic power amplification unit, and the voltage conversion unit provides proper working voltage for the ultrasonic power amplification unit.
Transparent acrylic 13 is arranged at two sides of the shell device 18, three equipment bins 3 are arranged in the shell device, three mobile phones or other recording equipment of a recording pen can be placed in the shell device at the same time, and a clock display screen 12 is arranged;
in the invention, the mobile phone is laterally arranged in the equipment bin 3, so that the mobile phone is stable and has no risk of toppling; in the design, the mobile phone is fixed by skillfully utilizing the partition plate between the two equipment bins 3, so that the operation can ensure that the microphones or other sound receiving devices at the two ends of the mobile phone are directly aligned to the ultrasonic shielding probe 16, the placing mode optimizes the effect of the ultrasonic shielding probe 16 on the sound receiving device of the mobile phone, and the superiority of the shielding effect is improved to the greatest extent.
In addition, the high-transparency acrylic plates are selectively used on the two sides of the device, so that the overall toughness and durability of the device are enhanced, and a user can easily and intuitively check and monitor the state of the internal equipment.
The external shell is carefully designed, so that the perfect combination of fashion and practicality is successfully realized: besides the basic anti-recording function, the shell is integrated with a clock and calendar display function, so that a user can conveniently acquire time and date information and correct and adjust the time and date information through the clock adjustment touch key 1; more humanized, the device still possesses real-time supervision and shows the function of ambient temperature and humidity, can satisfy the demand that the user knows in real time to the ambient condition for this device is not only a sound recording prevention instrument, more is a comprehensive multi-functional equipment, can satisfy the multiple demand of user in daily use.
The ultrasonic shielding probe 16 is an ultrasonic emitter arranged in an array and is detachably connected with the internal circuit board system 19;
in the present invention, the ultrasonic shielding probe 16 is designed as a group of ultrasonic transmitters arranged in an array; the layout of the array helps to achieve uniform and comprehensive ultrasonic emission, thereby improving shielding effect.
The connection mode of the ultrasonic shielding probe 16 and the internal circuit board system 19 adopts a detachable design: specifically, the ultrasonic shielding probe 16 is connected to the internal circuit board system 19 in a direct insertion manner by using a connection manner of the pin header and the female socket, and the direct insertion connection manner facilitates the installation and the disassembly of the ultrasonic shielding probe 16 and also facilitates the maintenance and the upgrade of equipment.
The connection mode of the pin header and the female seat not only ensures stable and reliable electrical connection between the ultrasonic shielding probe 16 and the internal circuit board system 19, but also is beneficial to realizing quick and simple replacement or maintenance of the ultrasonic shielding probe 16 when needed, and the design considers the practicability and maintainability of equipment, thereby being a connection mode meeting the requirements of practical application.
As shown in fig. 2, in some embodiments, the present device skillfully integrates the magnetic attraction device 4, the easy access device placement recess 2, and the device door opening 14 design to enhance the convenience of the user during use and the utility of the device.
The magnetic attraction device 4 interacts with the cover of the housing device 18, so that the cover can be tightly adsorbed above the device, the cover is ensured not to accidentally drop off in the use process, and the stability of the device is enhanced.
The design of the easy-to-take-and-place equipment placement groove 2 enables a user to put in and take out mobile phone equipment more conveniently: the presence of the easy-to-take-and-place device placement groove 2 not only improves the convenience of operation, but also helps to reduce damage or scratches that may be caused to the device during the taking-and-placing of the device.
The equipment door opening 14 is designed: because the cover adopts a magnetic attraction design, the connection with the device is more stable; in order to facilitate easier removal of the lid by the user when desired, the device is specifically designed with such an equipment door opening 14 so that the user can more conveniently handle the removal and placement of the lid.
Through these careful and humanized designs, the device also fully considers user's use experience on the basis of guaranteeing function realization, makes it more convenient and high-efficient in practical application.
As shown in fig. 7, in some embodiments, the power supply unit 17 is carefully designed and embedded with a short-circuit and overcurrent protection device: these safety devices are present to protect the overall circuitry from power failure or other potential hazards due to external or internal factors.
The short-circuit prevention device has the functions of rapidly cutting off the power supply when the power supply circuit is short-circuited, and preventing the circuit elements from being damaged by overlarge current caused by the short circuit or causing more serious consequences such as fire disaster: when the system detects a line short, the short prevention device is immediately activated, cutting off or limiting the supply of current, thereby protecting the circuit board and its various components.
The overcurrent prevention device can monitor whether the current of the circuit exceeds a preset safety range: the device automatically limits or cuts off excessive current to prevent damage or malfunction of the equipment due to excessive current once it is detected that the current exceeds the standard, and it ensures that the current flows within a safe range by monitoring the magnitude of the current in real time and comparing with a predetermined safe current value.
The power supply unit 17 is a power supply center of the entire internal circuit board system 19, and is fixed in the middle of the internal circuit board system 19, which is advantageous for distribution of power and layout of wires; the power supply unit 17 is connected to other components on the internal circuit board system 19 by wires to supply them with the necessary electrical energy; the power supply unit 17 stably, continuously and safely conveys the power supply to each component through a set circuit path, so that the stable operation of the whole system is ensured; in design, the layout of the circuit, the stability of connection and the efficiency of the power supply are considered, so that the power supply unit 17 can efficiently and safely transmit electric energy to each component.
As shown in fig. 1, 3 and 7, in some embodiments, the power control unit includes a system power button 9, a system operation button 8, a TYPE-C charging port 15, a power-on indicator lamp 11 and an operation indicator lamp 10, and is fixedly installed at the outside of the housing device 18, and the TYPE-C charging port 15 of the power control unit can supply power to both the power unit 17 and the whole system, and when an external power source is connected through the TYPE-C charging port 15, the system is supplied with power through the external power source and charges the power unit 17, and when the TYPE-C charging port 15 is not connected with the external power source, the system is supplied with power through the power unit 17.
As shown in fig. 7, in some embodiments, the master control system includes a program downloading interface, a crystal oscillator unit, a buck module, and a master control chip, where the program downloading interface is directly connected to the master control chip, allowing external program codes to be downloaded into the master control chip; the crystal oscillator unit is connected to the main control chip and provides necessary clock signals for the crystal oscillator unit; the voltage reducing module is connected to the main control chip and provides stable power supply voltage for the main control chip; the modules work together to ensure that the main control system can stably and efficiently run and meet various operation and control requirements of equipment.
The program downloading interface is a bridge for the communication between the main control system and the external device (such as a computer), and is mainly used for downloading the software program or firmware in the development stage into the main control chip: the method allows a developer to directly interact with the main control chip, and upload or modify programs running on the main control chip, so that the equipment is convenient to upgrade and maintain; the crystal oscillator unit is used as a stable clock source to provide an accurate clock signal for the main control chip, so that the stability and accuracy of the system operation are ensured, the running efficiency and accuracy of the whole system are affected, and the crystal oscillator unit is an indispensable part of the system; the step-down module is used for converting external power supply voltage into voltage required by the main control chip: for example, in this embodiment, the voltage reducing module converts the external voltage into a direct current voltage of 3.3V, so as to meet the working requirement of the main control chip, which is helpful for protecting the main control chip from being damaged by the excessive voltage and ensuring the stable and safe operation of the main control chip; the main control chip is the core of the whole main control system and is responsible for executing and processing all operation and control commands, and the main control chip controls and manages other modules and peripheral devices connected with the main control chip according to the pre-programmed instructions so as to ensure the normal operation of the system.
As shown in fig. 7, in some embodiments, the voltage conversion unit boosts the output voltage of the power supply unit 17 to supply power to the ultrasonic power amplification unit.
The voltage conversion unit receives the output voltage from the power supply unit 17: the core responsibility is to properly convert the received voltage according to the system requirement, in this embodiment, the unit mainly realizes the voltage boosting function, and the converted voltage is used to supply power to the ultrasonic power amplifier unit, so as to ensure that the power supply meeting the working requirement can be obtained.
As shown in fig. 7, in some embodiments, the wireless communication unit integrates a Wi-Fi module, so that the device can be connected to a wireless network of a home or an office, communication with a mobile phone is realized, remote control and viewing of the device state are realized, and a bluetooth module is further provided to support communication between the mobile phone and the device at a short distance, so that the device is suitable for control at a short distance.
When the device needs to be connected to a wide-range network, such as a home or office network, the Wi-Fi module is started, and the device is connected with a mobile phone of a user and other devices accessed through the network through the Wi-Fi network; when the distance between the user and the device is relatively short, connection can be realized through the Bluetooth module, and the Bluetooth connection is generally more stable and rapid and is suitable for short and frequent operation and control; through integrating Wi-Fi and two kinds of communication modules of bluetooth, the device has had comparatively abundant and nimble remote control ability, can satisfy the user and use under different scenes and demands.
As shown in fig. 7, in some embodiments, the ultrasonic power amplification unit plays a vital role, and is responsible for amplifying the signal sent by the main control system to drive the ultrasonic shielding probe 16 to operate, which is described in detail below with respect to the operation mechanism of the ultrasonic power amplification unit:
the ultrasonic power amplification unit firstly receives an original signal from the main control system. The signal is precisely generated by the main control system according to the working requirement of the anti-recording device, and after the signal is received, the power amplification unit amplifies the signal, so that the purpose of amplification is to ensure that the ultrasonic shielding probe 16 can receive sufficient energy to realize effective sound wave shielding, the amplified signal can be directly transmitted to the ultrasonic shielding probe 16, and the ultrasonic shielding probe 16 can generate corresponding ultrasonic waves according to the received signal so as to interfere and shield recording equipment in the surrounding environment.
The ultrasonic power amplification unit is closely cooperated with the main control system, so that the accuracy and stability of signals in the transmission and amplification processes are ensured; at the same time, the power amplifier unit also needs to maintain a good connection and match with the ultrasound shielding probe 16 to ensure that the output ultrasound signal has the desired frequency and intensity.
Through the steps, the ultrasonic power amplification unit successfully converts and amplifies signals of the main control system, and drives the ultrasonic shielding probe 16 to exert the maximum effect, so that effective interference and shielding of unnecessary sound recordings in the environment are realized.
As shown in fig. 7, in some embodiments, the ultrasonic shielding probe 16 is detachably connected to the ultrasonic power amplifier unit of the internal circuit board system 19 in a direct insertion manner, and is fixed in the ultrasonic shielding probe fixing groove 5.
The ultrasonic shielding probe 16 is directly inserted into a slot corresponding to the ultrasonic power amplification unit on the circuit board through a pin header: the connecting mode is simple and stable, and the probe is convenient to install and detach, and because the direct-insertion design is adopted, the probe can be easily detached when the probe needs to be replaced or maintained, and the daily maintenance and management of equipment are convenient; the ultrasonic shielding probe 16 is fixed in the ultrasonic shielding probe fixing groove 5 specially designed for the ultrasonic shielding probe 16, so that the stability of the ultrasonic shielding probe in the use process is ensured, the design of the ultrasonic shielding probe fixing groove 5 perfectly matches the shape and the size of the probe, and the position of the probe is ensured to be fixed in the working process, and the probe cannot shift or fall off due to vibration or other external factors; and the inner side of the ultrasonic shielding probe fixing groove 5 adopts grid opening treatment, so that the blocking effect of the ultrasonic shielding probe 16 due to structural aspects is reduced.
The usability and stability are fully considered in the design process, so that the ultrasonic shielding probe 16 can be fully protected, and the operation and maintenance of a user are facilitated; through the well-designed connection and fixation mode, the ultrasonic shielding probe 16 can be connected with an ultrasonic power amplification unit on a circuit board in a good quality, and normal operation and long-term stable operation of equipment are ensured.
As shown in fig. 5, 6 and 7, in some embodiments, the internal circuit board system 19 and the ultrasonic shielding probe 16 are installed from the bottom of the housing device 18 upwards after being connected, and are connected and fixed with the circuit board fixing holes 6 and the device bottom plate fixing holes 7 through screws.
Firstly, the internal circuit board system 19 and the ultrasonic shielding probe 16 are connected in advance, so that the connection stability and normal functions of all elements are ensured; after the pre-connection is completed, the connected internal circuit board system 19 and the ultrasonic shielding probe 16 are inserted together from the bottom of the shell device 18, and slide upwards along the interior of the shell to a designated position; the internal circuit board system 19 is fixed on the device bottom plate fixing hole 7 through the circuit board fixing hole 6 by using screws, so that the internal circuit board system 19 and the shell device 18 are firmly connected; because of the use of screw fixation, it is possible to easily perform by removing the screws when maintenance or replacement of the internal circuit board system 19 or the ultrasonic shielding probe 16 is required.
In the whole installation and fixing process, the stability and maintainability of the equipment are fully considered, the stability and reliability of the equipment in the operation process are ensured, and the later maintenance and replacement work is facilitated; through accurate hole site design and screw fixation mode for the connection between internal circuit board system 19 and the casing device 18 is more firm, satisfies the long-time stable operation's of equipment demand.
A use method of a portable desk type anti-recording device comprises the following steps:
s1, implementing nonlinear sweep frequency: the nonlinear sweep frequency is carried out in the designated frequency interval through the exponential algorithm, the complexity and shielding effect of the signal are improved by using the method, and the decoding difficulty of the recording equipment is increased, so that unauthorized recording is prevented more effectively.
S2, implementing frequency hopping: the pseudo random number generator is combined to carry out frequency hopping, unexpected frequency change is generated at a specific moment, and the interference effect on recording equipment is enhanced through the irregular frequency change, so that the stability and the safety of recording prevention are improved.
S3, dynamically generating PWM waves to interfere with each other: the frequency of the PWM wave is precisely generated and finely adjusted by utilizing the dynamic adjustment of a high-precision timer, a prescaler and a counter in the main control chip, so that the PWM wave meets the actual interference requirement, and the accuracy of interference is improved.
S4, dynamically adjusting a real-time feedback mechanism: the duty ratio of the PWM wave is dynamically adjusted according to a real-time feedback mechanism, and the intensity and the mode of the ultrasonic wave are optimized, so that the device can adaptively perform optimal sound recording interference prevention according to the actual environment and conditions.
In this example, a portable desktop anti-recording device exhibits its simple and accurate operating steps: firstly, properly placing a mobile phone into a device bin 3 specially designed for the mobile phone; then, the system power-on button 9 is operated, and the corresponding system power-on indicator lamp 11 is turned on to indicate that the built-in battery has started to supply power to the internal circuit board system 19 and the electronic clock display screen 12; then, when the system working button 8 is pressed, the corresponding system working indicator lamp 10 is also lightened to mark that the system is started, and the sound emitted by the mobile phone is shielded; the device ensures the simplicity of operation by the user-friendly design, and when the mobile phone is not arranged in the equipment bin 3, a user can stop the operation of the ultrasonic module by one-key operation and only keep the operation of the electronic clock, so that the energy consumption is greatly reduced, and meanwhile, the practicability of the equipment is also improved.
In some embodiments, as shown in fig. 8-12, in order to more intuitively demonstrate the effectiveness and distinction of the anti-sound recording device of the present invention, we use audio editing software (Cool edition Pro) to perform comparative analysis on the sound patterns of the commercially available common anti-sound recording device, the device of the present invention, the noise reduction filtering process, and the original undisturbed sound.
Firstly, an undisturbed sound wave diagram under an original recording environment is imported as a reference contrast; then, recording the audio under the working environment of the commercial anti-recording device, and importing the sound wave diagram into audio editing software; thirdly, recording the audio frequency under the working environment of the anti-recording device to obtain a corresponding sound wave diagram; in order to further analyze the effect of the invention, we also performed noise reduction filtering processing on the sound wave image and obtained the filtered sound wave image.
From the preliminary analysis, the difference between various acoustic wave patterns can be clearly seen, and the original acoustic wave patterns provide a clear and interference-free base line for us; the sound wave diagram generated by the commercial sound recording prevention device has larger noise, and the shadow of the sound wave diagram of the human voice can be seen in the sound wave diagram, so that the sound wave diagram has certain regularity; compared with the device, the sound wave diagram of the device of the invention shows very little noise, does not see any waveform of human voice, and has more complex sound wave change; the sound wave diagram after noise reduction and filtration further shows the obvious effect difference between the commercial device and the invention, the commercial device has clear human voice base line after noise reduction through filtration, and can clearly hear the speaking voice of a person, and the difference before and after noise reduction is not great, only the amplitude is reduced, and no human voice still exists.
As clearly shown in FIG. 13, to further verify the excellent performance of the device of the present invention, several popular anti-recording devices on the market were specially selected for comparison testing.
Tuepde is a shielding device which is perceived in the market and adopts a shielding strategy in an externally-placed mode, so that a user does not need to specially place a mobile phone in a specific area, however, the noise generated by the shielding device is relatively sharp, the user experience is reduced, and the actual shielding effect of the shielding device is still to be improved: even during its operation we can still capture the dialogue sound of the user.
Product a, originating from an emerging small business, whose working mechanism requires the user to put the phone in a specific location and is limited to accommodate only one piece of equipment, the shielding effect can only be rated as moderate, despite its low noise during operation: after professional filtering and noise reduction treatment, the dialogue content of the user is still discernable.
On the contrary, the application method of the invention is similar to that of the product A, but can be used for effectively shielding three recording devices at the same time, and more particularly, the invention hardly generates any interference during working, ensures the comfort level of human bodies, and particularly selects mobile phones (such as millet, hua Cheng, apple, VIVO, OPPO, realme, yiganhe and Mei) and various recording pens from a plurality of manufacturers for testing in order to comprehensively verify the universality of the invention, and the results show excellent shielding effects, and after professional filtering and noise reduction treatment, the dialogue sound of any user can not be captured, so that the excellent shielding effect of the device is fully demonstrated.
Summarizing, the device of the invention is not only quite innovative in technology, but also in practical application, the shielding effect of the device is certainly superior to that of similar products in other markets.
Finally, it should be noted that: the foregoing description is only illustrative of the preferred embodiments of the present invention, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements or changes may be made without departing from the spirit and principles of the present invention.
Claims (10)
1. The utility model provides a portable desk-top anti-recording device, including clock adjustment touch key (1), easily get and put equipment and settle recess (2), equipment bin (3), magnetism inhale device (4), ultrasonic shield probe fixed slot (5), circuit board fixed orifices (6), device bottom plate fixed orifices (7), system work button (8), system power on button (9), work pilot lamp (10), power on pilot lamp (11), clock display screen (12), transparent ya keli (13), equipment bin door opening (14), TYPE-C charge mouth (15), power supply unit (17), casing device (18), internal circuit board system (19) and ultrasonic shield probe (16), its characterized in that:
the clock adjustment touch key (1) and the clock display screen (12) are both positioned at the front side of the shell device (18), so that a user can conveniently view and adjust calendar and temperature and humidity information in real time; the clock adjustment touch key (1) is positioned at the bottom of the clock display screen (12) so as to carry out corresponding adjustment according to display content; the equipment bin (3) is positioned in the central area inside the shell device (18), and the two sides of the equipment bin are provided with equipment placement grooves (2) which are convenient for placing and taking equipment, so that a user can access mobile phone equipment more conveniently; the magnetic attraction device (4) is arranged at four corners of the top of the shell device (18) and is used for firmly adsorbing the cover on the device to prevent the cover from loosening or falling off accidentally in the use process; the ultrasonic shielding probe fixing grooves (5) are arranged on two sides of the equipment bin (3) so as to ensure that the ultrasonic shielding probe (16) can be effectively aligned with and interfere with a radio system of mobile phone equipment; the circuit board fixing holes (6) and the device bottom plate fixing holes (7) are distributed at the bottom of the shell device (18), and the internal circuit board system (19) is firmly installed inside by double screws; the system working button (8), the system power-on button (9), the working indicator lamp (10) and the power-on indicator lamp (11) are all positioned on one side of the shell device (18) and are arranged below the transparent acrylic (13), so that the operation of a user and the observation of the state of equipment are facilitated, and meanwhile, the appearance is kept clean; the transparent acrylic (13) is arranged at the centers of two sides of the shell device (18), and the reasonable size design ensures that a user can clearly observe the state in the equipment bin (3) and ensures the stability of the whole structure; the equipment bin door opening (14) is positioned at the top of the shell device (18) and is respectively arranged at the middle positions of the front side and the rear side, so that a user can more conveniently and easily operate the taking and placing of the magnetic cover; the TYPE-C charging port (15) is arranged at the bottom of the rear side of the shell device (18), so that the charging operation of the equipment is facilitated; the power supply unit (17) is positioned in the center of the internal circuit board system (19) and provides stable power supply for the whole system;
the internal circuit board system (19) adopts an algorithm strategy combining nonlinear sweep frequency and frequency hopping to interfere, and generates complex change signals so that mobile phone equipment is difficult to capture;
the internal circuit board system (19) comprises a power supply unit, a power supply control unit, a main control system, a voltage conversion unit, a wireless communication unit and an ultrasonic power amplification unit which are connected in sequence;
transparent acrylic (13) is arranged on two sides of the shell device (18), three equipment bins (3) are arranged in the shell device, three mobile phones or recording pens and other recording equipment can be placed at the same time, and a clock display screen (12) is arranged;
the ultrasonic shielding probes (16) are ultrasonic transmitters arranged in an array and are detachably connected with the internal circuit board system (19).
2. A portable desktop audio recording prevention device according to claim 1, wherein: the power supply unit (17) is internally provided with a short circuit prevention and overcurrent prevention device, is fixed in the middle of the internal circuit board system (19), and is electrically connected with the internal circuit board system to supply power.
3. A portable desktop audio recording prevention device according to claim 1, wherein: the power supply control unit comprises a system power-on button (9), a system working button (8), a TYPE-C charging port (15), a power-on indicator lamp (11) and a working indicator lamp (10), and is fixedly arranged on the outer side of the shell device (18), the TYPE-C charging port (15) of the power supply control unit can charge the power supply unit (17) and supply power to the whole system, when the TYPE-C charging port (15) is connected with an external power supply, the system is powered through the external power supply and charges the power supply unit (17), and when the TYPE-C charging port (15) is not connected with the external power supply, the system is powered through the power supply unit (17).
4. A portable desktop audio recording prevention device according to claim 1, wherein: the main control system comprises a program downloading interface, a crystal oscillator unit, a voltage reducing module and a main control chip, wherein the voltage reducing module is used for converting external power supply into 3.3V power supply for the main control chip.
5. A portable desktop audio recording prevention device according to claim 1, wherein: the voltage conversion unit boosts the output voltage of the power supply unit (17) so as to supply power to the ultrasonic power amplification unit.
6. A portable desktop audio recording prevention device according to claim 1, wherein: the wireless communication unit integrates a Wi-Fi module, so that the device can be connected to a wireless network of a home or an office, communication with a mobile phone is realized, remote control and device state checking are realized, and the device is further provided with a Bluetooth module, supports communication between the mobile phone and the device at a short distance, and is suitable for control at a short distance.
7. A portable desktop audio recording prevention device according to claim 1, wherein: the ultrasonic power amplification unit amplifies signals sent by the main control system and is used for driving the ultrasonic shielding probe (16) to work.
8. A portable desktop audio recording prevention device according to claim 1, wherein: the ultrasonic shielding probe (16) is detachably connected with the ultrasonic power amplification unit of the internal circuit board system (19) in a direct-insertion mode and is fixed in the ultrasonic shielding probe fixing groove (5).
9. A portable desktop audio recording prevention device according to claim 1, wherein: after the internal circuit board system (19) and the ultrasonic shielding probe (16) are connected, the ultrasonic shielding probe is installed upwards from the bottom of the shell device (18), and then the ultrasonic shielding probe is connected and fixed with the circuit board fixing holes (6) and the device bottom plate fixing holes (7) through screws, so that the shell device (18) and the internal circuit board system (19) are detachably connected.
10. A method of using a portable desktop anti-recording device according to any one of claims 1-9, wherein: comprises the steps of,
s1, implementing nonlinear sweep frequency: the nonlinear sweep frequency is carried out in the designated frequency interval through an exponential algorithm, so that the complexity and shielding effect of signals are improved, the decoding difficulty of recording equipment is increased, and unauthorized recording is prevented more effectively;
s2, implementing frequency hopping: frequency hopping is carried out by combining with a pseudo random number generator, unexpected frequency change is generated at a specific moment, the interference effect on recording equipment is enhanced through the irregular frequency change, and the stability and safety of recording prevention are improved;
s3, dynamically generating PWM waves to interfere with each other: the frequency of the PWM wave is precisely generated and finely adjusted by utilizing the dynamic adjustment of a high-precision timer, a prescaler and a counter in the main control chip, so that the PWM wave meets the actual interference requirement, and the accuracy of interference is improved;
s4, dynamically adjusting a real-time feedback mechanism: the duty ratio of the PWM wave is dynamically adjusted according to a real-time feedback mechanism, and the intensity and the mode of the ultrasonic wave are optimized, so that the device can adaptively perform optimal sound recording interference prevention according to the actual environment and conditions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311466072.0A CN117254875B (en) | 2023-11-07 | 2023-11-07 | Portable desk-top anti-recording device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311466072.0A CN117254875B (en) | 2023-11-07 | 2023-11-07 | Portable desk-top anti-recording device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN117254875A CN117254875A (en) | 2023-12-19 |
| CN117254875B true CN117254875B (en) | 2024-01-26 |
Family
ID=89126583
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311466072.0A Active CN117254875B (en) | 2023-11-07 | 2023-11-07 | Portable desk-top anti-recording device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117254875B (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010011412A (en) * | 2008-06-30 | 2010-01-14 | Rhythm Watch Co Ltd | Eavesdropping device detector and clock |
| KR20150002730U (en) * | 2015-06-20 | 2015-07-09 | 성준기 | Ultrasonic Recording and Bug Suppressor |
| CN105306163A (en) * | 2015-10-29 | 2016-02-03 | 天津光电安辰信息技术有限公司 | Portable recording shielding device and realizing method thereof |
| CN107204823A (en) * | 2017-06-02 | 2017-09-26 | 中国科学院声学研究所 | A kind of acoustic interference device for taking precautions against mobile phone recording and eavesdropping |
| CN107820161A (en) * | 2017-10-31 | 2018-03-20 | 广州矽创信息科技有限公司 | One kind recording interferometer and its mixing Poewr control method |
| CN207340172U (en) * | 2017-10-31 | 2018-05-08 | 广州矽创信息科技有限公司 | One kind recording interferometer |
| CN110213011A (en) * | 2019-07-11 | 2019-09-06 | 东莞市普乔电子科技有限公司 | A kind of anti-eavesdrop steals recording device |
| RU2737510C1 (en) * | 2020-02-07 | 2020-12-01 | Елена Евгеньевна Бородовицына | Ultrasonic acoustic device for suppression of speech information recording devices |
| CN114338894A (en) * | 2022-03-07 | 2022-04-12 | 天津市英讯科技有限公司 | Mobile phone recording shielding system and method |
| CN116709205A (en) * | 2023-07-05 | 2023-09-05 | 广东电网有限责任公司 | Distributed interference source positioning method and system for electric power Internet of things |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2585886B (en) * | 2019-07-19 | 2023-10-18 | Kirintec Ltd | A signal generator |
-
2023
- 2023-11-07 CN CN202311466072.0A patent/CN117254875B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010011412A (en) * | 2008-06-30 | 2010-01-14 | Rhythm Watch Co Ltd | Eavesdropping device detector and clock |
| KR20150002730U (en) * | 2015-06-20 | 2015-07-09 | 성준기 | Ultrasonic Recording and Bug Suppressor |
| CN105306163A (en) * | 2015-10-29 | 2016-02-03 | 天津光电安辰信息技术有限公司 | Portable recording shielding device and realizing method thereof |
| CN107204823A (en) * | 2017-06-02 | 2017-09-26 | 中国科学院声学研究所 | A kind of acoustic interference device for taking precautions against mobile phone recording and eavesdropping |
| CN107820161A (en) * | 2017-10-31 | 2018-03-20 | 广州矽创信息科技有限公司 | One kind recording interferometer and its mixing Poewr control method |
| CN207340172U (en) * | 2017-10-31 | 2018-05-08 | 广州矽创信息科技有限公司 | One kind recording interferometer |
| CN110213011A (en) * | 2019-07-11 | 2019-09-06 | 东莞市普乔电子科技有限公司 | A kind of anti-eavesdrop steals recording device |
| RU2737510C1 (en) * | 2020-02-07 | 2020-12-01 | Елена Евгеньевна Бородовицына | Ultrasonic acoustic device for suppression of speech information recording devices |
| CN114338894A (en) * | 2022-03-07 | 2022-04-12 | 天津市英讯科技有限公司 | Mobile phone recording shielding system and method |
| CN116709205A (en) * | 2023-07-05 | 2023-09-05 | 广东电网有限责任公司 | Distributed interference source positioning method and system for electric power Internet of things |
Non-Patent Citations (1)
| Title |
|---|
| 基于电磁干扰模拟传感器的防窃听技术研究;吴燕静;马卓然;徐文渊;;电子技术(第04期);全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN117254875A (en) | 2023-12-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203744088U (en) | Multifunctional desk lamp | |
| CN103686502A (en) | 5.1 sound track Bluetooth noise cancelling headset | |
| CN111385716A (en) | Self-adaptive pickup all-in-one machine control system | |
| CN103235529A (en) | Control circuit system applied in sex toy | |
| CN104053108A (en) | Intelligent auditory sense assisting equipment | |
| CN117254875B (en) | Portable desk-top anti-recording device | |
| CN204993795U (en) | Solar energy bluetooth speaker | |
| CN203746431U (en) | MP3 player | |
| CN201076597Y (en) | Improvement of electric interesting article | |
| CN205942241U (en) | Portable multi -functional projection arrangement | |
| CN203457274U (en) | Mini-speaker | |
| CN208924256U (en) | A kind of recording countermeasure set | |
| CN112581932A (en) | Wired and wireless sound mixing system based on DSP | |
| CN209301154U (en) | A kind of equipment for hearing test | |
| CN202736484U (en) | Playing device all-in-one machine | |
| CN208481850U (en) | Pocket low frequency music massage cushion | |
| CN216122855U (en) | Voice-operated pattern light-emitting Bluetooth sound box circuit system | |
| WO2013185524A1 (en) | Magnetic induction audio equipment | |
| CN212850522U (en) | Hidden sound box recording shielding device | |
| CN103871455A (en) | MP3 (moving picture experts group audio layer-3) player | |
| CN203340167U (en) | Sound recording instrument | |
| CN115426865B (en) | Mobile phone shielding cabinet | |
| CN110190903A (en) | Portable duplex visible light communication device | |
| CN215647189U (en) | Power amplifier all-in-one machine with wireless microphone charging function | |
| CN218240891U (en) | Portable sound card tuning device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |