CN114338894A - Mobile phone recording shielding system and method - Google Patents
Mobile phone recording shielding system and method Download PDFInfo
- Publication number
- CN114338894A CN114338894A CN202210214833.2A CN202210214833A CN114338894A CN 114338894 A CN114338894 A CN 114338894A CN 202210214833 A CN202210214833 A CN 202210214833A CN 114338894 A CN114338894 A CN 114338894A
- Authority
- CN
- China
- Prior art keywords
- module
- shielding
- electrically connected
- main control
- control module
- 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.)
- Pending
Links
Images
Landscapes
- Telephone Function (AREA)
Abstract
The invention relates to a mobile phone recording shielding system and a method, comprising the following steps: the main control module is integrated with a clock module, and a crystal oscillator OSC is arranged in the clock module; the NOT gate is electrically connected with the main control module and is used for controlling the MOS tube and the ultrasonic module to be opened and closed; the MOS tube and ultrasonic wave module is used for driving the probe of the shielding device to work and comprises a plurality of N-MOS electrically connected with a NAND gate and inductive ultrasonic wave sensors respectively electrically connected with the N-MOS; the shielding probe is electrically connected with the MOS tube and the ultrasonic module; and the power supply module is electrically connected with the main control module and the shielding device probe respectively for supplying power. The invention generates the mixing frequency signal which is close to the audible frequency range through the MOS tube and the ultrasonic module, the mixing frequency signal is weak relative to the human ear identification, the conversation process is not influenced, and meanwhile, the shielding signal can be prevented from being filtered out in the conversation process by the high-quality noise reduction and filtering function of the mobile phone, thereby ensuring the shielding effect of the recording shielding system and having better application and popularization values.
Description
Technical Field
The invention relates to the technical field of recording shielding, in particular to a mobile phone recording shielding system and a mobile phone recording shielding method.
Background
In the process of mobile phone communication, some lawless persons illegally steal personal privacy, business secrets and even national secrets through a recording pen or other micro eavesdropping devices with stronger specialties, so that individuals and enterprises suffer economic losses, and even the national security is threatened. Therefore, the development of the anti-sound recording (anti-eavesdropping) technology has become a technical problem to be solved urgently by those skilled in the art.
The traditional recording shielding technical scheme mainly utilizes a random pulse sequence with a wide frequency range to carry out disorder interference, and a high-power high-frequency signal generates electromagnetic interference on recording equipment, so that the input voltage or the input current at the front end of an acoustic sensor exceeds the threshold value of the acoustic sensor, and the acoustic sensor cannot normally work to achieve effective voice blocking. Nowadays, it is higher and higher to reduce an noise filtering effect along with the cell-phone conversation, consequently can filter the high-power high frequency signal of shielding ware at the conversation in-process, and then influence the use of shielding ware, and the wireless electromagnetic signal of power can produce electromagnetic radiation in addition, and long-time the use is harmful to the human body.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects in the prior art and provides a mobile phone recording shielding system and method based on an ultrasonic technology.
The invention is realized by the following technical scheme:
a mobile phone recording shielding system, comprising:
the main control module is integrated with a clock module, and a crystal oscillator OSC is arranged in the clock module;
the NOT gate is electrically connected with the main control module and is used for controlling the MOS tube and the ultrasonic module to be opened and closed;
the MOS tube and ultrasonic wave module is used for driving the probe of the shielding device to work and comprises a plurality of N-MOS electrically connected with a NAND gate and inductive ultrasonic wave sensors respectively electrically connected with the N-MOS;
the shielding probe is electrically connected with the MOS tube and ultrasonic module;
and the power supply module is electrically connected with the main control module and the shielding device probe respectively for supplying power.
According to the above technical scheme, preferably, the power supply module is electrically connected with the main control module through the voltage reduction module, and the power supply module is electrically connected with the shield probe through the voltage boosting module.
According to the above technical solution, preferably, the voltage reduction module provides 3.3V voltage for the main control module, and the voltage boost module provides 35V voltage for the shield probe.
According to the technical scheme, preferably, the main control module is electrically connected with a remote controller, and the remote controller controls the start and stop of the main control module through high and low levels.
According to the above technical solution, preferably, the N-MOS is provided with 6 groups.
According to the technical scheme, preferably, the main control module changes the frequency once every 100ms by controlling the MOS tube and the ultrasonic module through the NOT gate, so that the frequency floats at plus or minus 19.5K.
The patent also discloses a mobile phone recording shielding method, which is characterized by comprising the following steps: a. the main control module continuously sends an opening and closing instruction to the NOT gate according to the time interval; b. the NOT gate controls the MOS tube and the ultrasonic module to be opened and closed according to the received opening and closing instruction; c. the MOS tube and ultrasonic module generates 21 +/-2.5 k of variable frequency signals and sends the signals out through the shielding device probe.
According to the above technical solution, preferably, the time interval is a random time interval, so that the frequency conversion signal generated by the MOS transistor and the ultrasonic module changes randomly within a range of 21 ± 2.5 k.
According to the above technical solution, preferably, step a includes: a time interval database is built in the main control module, and the time interval database comprises data of a plurality of time intervals; the main control module randomly selects data of time intervals in the time interval database and continuously sends an opening and closing instruction to the NOT gate according to the random time intervals.
The invention has the beneficial effects that:
according to the invention, the MOS tube and the ultrasonic module are used for generating the mixing frequency signal which is close to the audible frequency range (0-20 KHz), the mixing frequency signal is weak relative to the human ear recognition, the conversation process is not influenced, and meanwhile, the shielding signal can be prevented from being filtered out in the conversation process by the high-quality noise reduction and filtering function of the mobile phone, so that the shielding effect of the recording shielding system is ensured, and the application and popularization values are better.
Drawings
Fig. 1 is a schematic diagram of the module connection of the present invention.
Fig. 2 is a schematic diagram of a connection terminal of the main control module of the present invention.
Fig. 3 is a schematic diagram of the connection terminals of the voltage dropping module of the present invention.
Fig. 4 is a schematic diagram of the terminals of the boost module of the present invention.
Fig. 5 is a schematic view of the connection terminal of the remote controller of the present invention.
FIG. 6 is a schematic diagram of the NOT gate and N-MOS terminals of the present invention.
Fig. 7 is a schematic diagram of the terminals of the inductive ultrasonic sensor of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and preferred embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in the figures, the present invention comprises: the main control module is integrated with a clock module, and a crystal oscillator OSC is arranged in the clock module; the NOT gate is electrically connected with the main control module and is used for controlling the MOS tube and the ultrasonic module to be opened and closed; the device comprises a MOS tube and ultrasonic wave module, a shielding device probe and a power supply module, wherein the MOS tube and ultrasonic wave module is used for driving the shielding device probe to work, the MOS tube and ultrasonic wave module comprises a plurality of N-MOS electrically connected with a NAND gate and inductive ultrasonic wave sensors respectively electrically connected with the N-MOS, and in the example, 6 groups of N-MOS are preferably arranged; the shielding probe is electrically connected with the MOS tube and ultrasonic module; and the power supply module is electrically connected with the main control module and the shielding device probe respectively for supplying power. According to the invention, the MOS tube and the ultrasonic module are used for generating the mixing frequency signal which is close to the audible frequency range (0-20 KHz), the mixing frequency signal is 21 +/-2.5 k in the embodiment, the mixing frequency signal can be transmitted along with the call signal and cannot be filtered by the high-quality noise reduction filtering function of the mobile phone, and meanwhile, the mixing frequency signal is weak relative to the recognition of human ears and cannot influence the conversation process.
According to the above embodiment, preferably, the power supply module is electrically connected to the main control module through the voltage reduction module, the power supply module is electrically connected to the shield probe through the voltage boost module, the voltage reduction module provides 3.3V for the main control module, and the voltage boost module provides 35V for the shield probe. The voltage reduction module is a voltage reduction chip LM2576, as shown in FIG. 3, a pin 1 of the voltage reduction chip LM2576 is connected in series with a 12v power supply module, a capacitor is grounded through C3 and C4 in parallel, a feedback end of a pin 4 of the voltage reduction chip LM2576 is connected in parallel with capacitors C1 and C6 in parallel, an output end of a pin 2 of the voltage reduction chip LM2576 is connected in parallel with an opposite end of a D1 grounding diode, an inductor L1 is connected in series, a 3.3v power supply is output, capacitors are grounded through C6, C1 and C5 in parallel, and a capacitor R2 and a D2 are connected in series and grounded. The boosting module is a boosting chip XL6009E1, as shown in FIG. 4, pin 1 of the boosting chip XL6009E1 is grounded, pin 4 is connected with a 12v power supply module, C22 and C23 are connected in parallel and are grounded, pin 3 of the boosting chip XL6009E1 is connected with a D3 diode in the forward direction, and the reverse direction is connected with pins 1 and 2 of U21 in parallel and are connected with C21 and C20 grounded capacitors in parallel and output 35v voltage. The 4 pins and the 2 pins of the boost chip XL6009E1 are connected in series, the 4 pin is connected with one end of an L21 inductor, the 3 pin is connected with the other end of an L21 inductor, the 5 pin of the chip is connected in parallel with a ground resistor of 1.3K, and the 3 rd pin of a U21 is connected in series.
According to the above embodiment, preferably, the main control module is electrically connected with a remote controller, and the remote controller controls the start and stop of the main control module through high and low levels. As shown in fig. 5, the level of pin 1 of J3 in the remote controller is determined by the level of pin 2 of J3, pin 1 is high level at ordinary times, the main control module does not work, when the remote controller controls the main control module to work, pin 1 and pin 4 are short-circuited, the main control module reads low level, and the main control module starts to work.
According to the above embodiment, preferably, the main control module changes the frequency once every 100ms by using the not gate control MOS transistor plus the ultrasonic module, so that the frequency floats at plus or minus 19.5K. The NOT gate adopts a 74HC04 chip to convert the level of a singlechip of the main control module and controls the switching of the MOS tube, as shown in FIG. 6, the G pole of each N-MOS is connected with the output end of a 74HC04 chip, the input end of a 74HC04 chip is electrically connected with the main control module, as shown in FIG. 7, the MOS tube and ultrasonic wave module comprises a plurality of inductance ultrasonic sensors, and one end of each inductance is connected with the D pole of the N-MOS.
According to the invention, the MOS tube and the ultrasonic module are used for generating the mixing frequency signal which is close to the audible frequency range (0-20 KHz), the mixing frequency signal is weak relative to the human ear recognition, the conversation process is not influenced, and meanwhile, the shielding signal can be prevented from being filtered out in the conversation process by the high-quality noise reduction and filtering function of the mobile phone, so that the shielding effect of the recording shielding system is ensured, and the application and popularization values are better.
The patent also discloses a mobile phone recording shielding method, which comprises the following steps:
a. the main control module continuously sends an opening and closing instruction to the NOT gate according to a time interval, wherein the time interval is a random time interval, and frequency conversion signals generated by the MOS tube and ultrasonic module change in disorder within a range of 21 +/-2.5 k. Specifically, a time interval database is established in a main control module, the time interval database comprises data of a plurality of time intervals, the main control module randomly selects the data of the time intervals in the time interval database before sending an opening and closing instruction every time, and the opening and closing instruction is repeatedly sent to the NOT gate continuously.
b. And the NOT gate controls the MOS tube and the ultrasonic module to be opened and closed according to the received opening and closing instruction.
c. The MOS tube and ultrasonic module generates 21 +/-2.5 k of variable frequency signals and sends the signals out through the shielding device probe.
The frequency conversion signal generated by the method has the characteristic of disordered random frequency conversion, the frequency at any time point is different, and the signal is transmitted through the shielding device probe, so that the sound collection and noise reduction filtering of the recording equipment are invalid, the shielding signal can be prevented from being filtered in the conversation process by the high-quality noise reduction filtering function of the mobile phone, and the safety of voice information is ensured.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (9)
1. A mobile phone recording shielding system, comprising:
the main control module is integrated with a clock module, and a crystal oscillator OSC is arranged in the clock module;
the NOT gate is electrically connected with the main control module and is used for controlling the MOS tube and the ultrasonic module to be opened and closed;
the MOS tube and ultrasonic wave module is used for driving the probe of the shielding device to work and comprises a plurality of N-MOS electrically connected with a NAND gate and a plurality of inductance ultrasonic wave sensors respectively electrically connected with the N-MOS;
the shielding probe is electrically connected with the MOS tube and ultrasonic module;
and the power supply module is electrically connected with the main control module and the shielding device probe to supply power.
2. The mobile phone recording and shielding system of claim 1, wherein the power module is electrically connected to the main control module through the voltage-reducing module, and the power module is electrically connected to the shielding probe through the voltage-increasing module.
3. The mobile phone recording and shielding system of claim 2, wherein the voltage-reducing module provides 3.3V to the main control module, and the voltage-increasing module provides 35V to the shielding probe.
4. The mobile phone recording shielding system of claim 1, wherein the main control module is electrically connected to a remote controller, and the remote controller controls the on/off of the main control module through high and low levels.
5. The mobile phone recording shielding system of claim 1, wherein the N-MOS is provided with 6 groups.
6. The mobile phone recording and shielding system of claim 1 or 5, wherein the master control module changes the frequency once every 100ms by using a NOT gate control MOS tube and an ultrasonic module, so that the frequency floats at plus or minus 19.5K.
7. A mobile phone recording shielding method based on the mobile phone recording shielding system of any one of claims 1 to 6, characterized by comprising the following steps:
a. the main control module continuously sends an opening and closing instruction to the NOT gate according to the time interval; b. the NOT gate controls the MOS tube and the ultrasonic module to be opened and closed according to the received opening and closing instruction; c. the MOS tube and ultrasonic wave module comprises a plurality of N-MOS electrically connected with the NAND gate and a plurality of inductance ultrasonic wave sensors electrically connected with the N-MOS respectively, and the MOS tube and ultrasonic wave module generates 21 +/-2.5 k frequency conversion signals and sends the frequency conversion signals through the shielding device probe.
8. The mobile phone recording shielding method of claim 7, wherein the time interval is a random time interval, so that the frequency conversion signal generated by the MOS tube and the ultrasonic module changes randomly within a range of 21 ± 2.5 k.
9. The method for shielding mobile phone records according to claim 8, wherein step a comprises: a time interval database is built in the main control module, and the time interval database comprises data of a plurality of time intervals; the main control module randomly selects data of time intervals in the time interval database and continuously sends an opening and closing instruction to the NOT gate according to the random time intervals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210214833.2A CN114338894A (en) | 2022-03-07 | 2022-03-07 | Mobile phone recording shielding system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210214833.2A CN114338894A (en) | 2022-03-07 | 2022-03-07 | Mobile phone recording shielding system and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114338894A true CN114338894A (en) | 2022-04-12 |
Family
ID=81030767
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210214833.2A Pending CN114338894A (en) | 2022-03-07 | 2022-03-07 | Mobile phone recording shielding system and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114338894A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117254875A (en) * | 2023-11-07 | 2023-12-19 | 长春理工大学 | Portable desk-top anti-recording device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203243413U (en) * | 2013-04-28 | 2013-10-16 | 黑龙江工程学院 | Anti-eavesdropping and recording blocker device |
| CN106658285A (en) * | 2016-10-21 | 2017-05-10 | 天津市英讯科技有限公司 | Miniature frequency-mixing and recording isolator |
| CN206237590U (en) * | 2016-10-21 | 2017-06-09 | 天津市英讯科技有限公司 | Small-sized mixing recording shielding device |
| CN215222473U (en) * | 2021-05-26 | 2021-12-17 | 重庆清文科技有限公司 | Sound box capable of preventing sound recording |
-
2022
- 2022-03-07 CN CN202210214833.2A patent/CN114338894A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203243413U (en) * | 2013-04-28 | 2013-10-16 | 黑龙江工程学院 | Anti-eavesdropping and recording blocker device |
| CN106658285A (en) * | 2016-10-21 | 2017-05-10 | 天津市英讯科技有限公司 | Miniature frequency-mixing and recording isolator |
| CN206237590U (en) * | 2016-10-21 | 2017-06-09 | 天津市英讯科技有限公司 | Small-sized mixing recording shielding device |
| CN215222473U (en) * | 2021-05-26 | 2021-12-17 | 重庆清文科技有限公司 | Sound box capable of preventing sound recording |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117254875A (en) * | 2023-11-07 | 2023-12-19 | 长春理工大学 | Portable desk-top anti-recording device |
| CN117254875B (en) * | 2023-11-07 | 2024-01-26 | 长春理工大学 | Portable desk-top anti-recording device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2520330B1 (en) | Low power signal transmission | |
| CN114338894A (en) | Mobile phone recording shielding system and method | |
| SE0901000A2 (en) | A voice control system for an implant | |
| JPH08512177A (en) | Method and apparatus for interfacing twisted pair with intelligent cells | |
| CN203243413U (en) | Anti-eavesdropping and recording blocker device | |
| CN205041381U (en) | Intelligence emergency call device based on monitoring of nurse of hospital | |
| CN205198725U (en) | Supersound nerve stimulation equipment and system | |
| CN104208822A (en) | Expert system on basis of ultrasonic physiotherapeutic apparatus | |
| CN206462486U (en) | Wireless communication helmet with speech identifying function | |
| CN111145399A (en) | Intelligent fingerprint lock with biological sign recognition and remote alarm functions | |
| CN105915864A (en) | Visible analog indoor intercom controlled by single chip and control method | |
| CN213424038U (en) | Full-automatic door lock with voice awakening function | |
| CN210693953U (en) | Anti-eavesdropping and anti-stealing recording device | |
| CN220325622U (en) | Prevent recording ultrasonic wave interference circuit, interference equipment | |
| CN208971572U (en) | Mobile terminal | |
| CN210867730U (en) | Large-scale hidden recording shielding ware | |
| CN106856020A (en) | A kind of gate control system for having Visual communications | |
| CN210867731U (en) | Small-size hidden recording shielding ware | |
| CN216817464U (en) | Intelligent door lock control system with active anti-electromagnetic interference capability | |
| WO2010146490A1 (en) | Signal-detection with band-pass spectral shaping | |
| CN214539983U (en) | Pulse magnetic field induction trigger device | |
| CN206133825U (en) | Electricity signal trigger's electric pulse type reminding device | |
| CN210444285U (en) | Portable recording shielding device | |
| CN207302251U (en) | Fire alarm intelligent sound control circuit | |
| CN210444284U (en) | Ceiling type recording shielding 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 | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20220412 |