Protection device for preventing eavesdropping of microphone of mobile terminal

Abstract

The invention provides a protection device for preventing eavesdropping of a microphone of a mobile terminal, and the device comprises a connection joint which is used for being connected with an earphone interface of the mobile terminal, and the earphone interface is an interface capable of transferring the microphone function of the mobile terminal; the protection circuit is connected with the connection joint so as to be connected with an earphone interface of the mobile terminal through the connection joint, so that the mobile terminal transfers a microphone function to the connection joint through the earphone interface; wherein the protection circuit can remove the microphone function of the connection joint. The anti-eavesdropping device is simple in structure and low in cost, interference audios do not need to be sent through ultrasonic waves, a user is prevented from being exposed in an ultrasonic environment for a long time, the technical effects of reducing the anti-eavesdropping cost, improving the anti-eavesdropping effect and improving the user experience are achieved, the microphone function of the mobile terminal can disappear when the anti-eavesdropping device is connected with the earphone interface of the mobile terminal, and the user experience is improved. Macro eavesdropping of the mobile terminal is prevented, and the privacy security of the mobile terminal is protected.

Description

Technical Field

[0001] This invention relates to the field of information security technology, and in particular to a protective device for preventing eavesdropping on the microphone of a mobile terminal. Background Technology

[0002] In recent years, mobile phone eavesdropping has become a major threat to personal privacy and information security. It is mainly achieved through the implantation of malicious software programs and abuse of permissions. On a small scale, information such as the chat content of individual users will be eavesdropped on and sold, causing users to become "transparent people". On a large scale, mobile phone eavesdropping of important personnel of enterprises and governments will lead to the leakage of trade secrets and state secrets. At present, the commonly used mobile phone eavesdropping protection measures mainly include ultrasonic interference technology and anti-eavesdropping noise reduction and sound insulation equipment. (1) Ultrasonic interference technology mainly sends high-power ultrasonic waves to the mobile phone recording device, causing the recording device to cause nonlinear distortion due to waveform amplitude limitation when receiving signals, thereby generating interference signals and destroying the recording function. However, the disadvantage is that the device has high power and is not convenient to carry. The cost of use for ordinary users is relatively high, and users may suffer from hearing, nervous system and other health risks if they carry ultrasonic devices for a long time. (2) Anti-eavesdropping noise reduction and sound insulation equipment mainly adds a shell to the mobile phone and places the mobile phone in the shell. It is isolated by the relevant materials in the shell or the ultrasonic waves in the shell. However, the disadvantage is that the mobile phone with the shell is relatively bulky, which causes inconvenience to the user's operation and use. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide a protective device for preventing eavesdropping on the microphone of a mobile terminal, so as to solve at least one of the technical problems involved in the background art.

[0004] To achieve the above objectives, the present invention provides a protective device for preventing microphone eavesdropping on mobile terminals, comprising: A connector for connecting to the headphone jack of a mobile terminal, wherein the headphone jack is an interface capable of transferring the microphone function of the mobile terminal; A protection circuit is connected to the connector to connect to the headphone jack of the mobile terminal via the connector, so that the mobile terminal can transfer the microphone function to the connector via the headphone jack. The protection circuit can remove the microphone function of the connector.

[0005] Furthermore, the protection circuit includes an auxiliary identification circuit and a fake microphone circuit, and the connector includes a first identification port and a first microphone function port. The auxiliary identification circuit is connected to the first identification port, and the fake microphone circuit is connected to the first microphone function port. The auxiliary identification circuit is used to enable the mobile terminal to transfer the microphone function to the first microphone function port, and the pseudo-microphone circuit is used to remove the microphone function from the first microphone function port.

[0006] Furthermore, the pseudo-microphone circuit includes a first resistor, one end of which is connected to the first microphone function port, and the other end of which is grounded.

[0007] Furthermore, the pseudo-microphone circuit includes a pseudo-microphone device, one end of which is connected to the first microphone function port, and the other end of which is grounded. The pseudo-microphone device does not have microphone functionality.

[0008] Furthermore, the pseudo-microphone circuit also includes a second resistor, one end of which is connected to the first microphone function port, and the other end of which is grounded.

[0009] Furthermore, the pseudo-microphone circuit also includes a first capacitor located between the first microphone function port and the second resistor.

[0010] Furthermore, the protection device also includes a housing, which covers the periphery of the protection circuit. The housing has an opening, through which the connection connector is connected to the protection circuit.

[0011] Furthermore, the auxiliary identification circuit includes a third resistor, one end of which is connected to the first identification port, and the other end of which is grounded.

[0012] Furthermore, the resistance of the first resistor is 2200±100Ω.

[0013] Furthermore, the resistance of the third resistor is 5100±100Ω.

[0014] As can be seen from the above, the present invention provides a protective device for preventing microphone eavesdropping on mobile terminals. Through a connected connector and a protective circuit, when the connector is connected to the headphone jack of a mobile terminal, the mobile terminal transfers its microphone function to the connector via the headphone jack. The protective circuit then removes the microphone function from the connector, rendering the mobile terminal without a microphone, thus preventing microphone eavesdropping. This application features a simple structure and low cost. It eliminates the need to transmit interference audio via ultrasound, avoiding prolonged exposure of users to ultrasonic environments. This achieves the technical effects of reducing anti-eavesdropping costs, improving anti-eavesdropping effectiveness, and enhancing user experience. Furthermore, it prevents microphone eavesdropping on mobile terminals and protects their privacy and security when connected to the headphone jack. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of a protective device for preventing microphone eavesdropping on mobile terminals according to an embodiment of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the structure of a protective device for preventing microphone eavesdropping on mobile terminals according to an embodiment of the present invention. Figure 2 ; Figure 3 This is a schematic diagram of the structure of a protective device for preventing microphone eavesdropping on mobile terminals according to an embodiment of the present invention. Figure 3 .

[0017] In the diagram: 100, connector; 110, first identification port; 120, first microphone function port; 200, protection circuit; 210, auxiliary identification circuit; 211, third resistor; 220, pseudo-microphone circuit; 221, first resistor; 222, pseudo-microphone device; 223, second resistor; 224, first capacitor; 300, housing. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0019] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this invention should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the term encompasses the elements or objects listed following the term and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0020] As described in the background technology, in recent years, mobile phone eavesdropping has become an important hidden danger to personal privacy and information security. It is mainly achieved through the implantation of malicious software programs and abuse of permissions. On a small scale, information such as the chat content of individual users will be eavesdropped and sold, causing users to become "transparent people". On a large scale, mobile phone eavesdropping of important personnel of enterprises and governments will lead to the leakage of trade secrets and state secrets. At present, the commonly used mobile phone eavesdropping protection measures mainly include ultrasonic interference technology and anti-eavesdropping noise reduction and sound insulation equipment. (1) Ultrasonic interference technology mainly sends high-power ultrasonic waves to the mobile phone recording device, causing the recording device to cause nonlinear distortion due to waveform amplitude limitation when receiving signals, thereby generating interference signals and destroying the recording function. However, the disadvantage is that the device has high power and is not convenient to carry. The cost of use for ordinary users is relatively high, and users may suffer from hearing, nervous system and other health risks if they carry ultrasonic devices for a long time. (2) Anti-eavesdropping noise reduction and sound insulation equipment mainly adds a shell to the mobile phone and places the mobile phone in the shell. It is isolated by the relevant materials in the shell or the ultrasonic waves in the shell. However, the disadvantage is that the mobile phone with the shell is relatively bulky, which causes inconvenience to the user's operation and use.

[0021] Based on this, this application proposes a protective device to prevent microphone eavesdropping on mobile terminals, which transfers the microphone function of the mobile terminal to the protective device, and the protective device can remove the microphone function, so that neither the mobile terminal nor the protective device has a microphone function, thereby achieving privacy protection for the mobile terminal.

[0022] The following describes the process in detail through one or more specific embodiments.

[0023] In some embodiments, such as Figure 1 and Figure 2 As shown, a protective device for preventing eavesdropping on a mobile terminal's microphone includes: Connector 100 is used to connect to the headphone jack of a mobile terminal, wherein the headphone jack is an interface capable of transferring the microphone function of the mobile terminal; A protection circuit 200 is connected to the connector 100 to connect to the headphone jack of the mobile terminal via the connector 100, so that the mobile terminal can transfer the microphone function to the connector 100 via the headphone jack. The protection circuit 200 is capable of removing the microphone function of the connector 100.

[0024] Specifically, the mobile terminal can be a mobile network device with microphone functionality, such as a mobile phone, laptop, or tablet computer, and the headphone jack is an interface with microphone functionality on the mobile terminal. The headphone jack can be a Type-C interface. A USB-C interface is also possible, as is a TRRS (TRRS: Tip Ring Ring Sleeve, four-section headphone). The microphone interface is a microphone interface, and correspondingly, the connector 100 is a connector adapted to the headphone interface. When the headphone interface is a Type-C interface... When using a C interface, the connector 100 is a Type-C connector. When the headphone jack is a TRRS jack, the connector 100 is a TRRS connector.

[0025] The protection circuit 200 is connected to the connector 100 so that when the connector 100 is connected to the headphone jack, the mobile terminal corresponding to the headphone jack can recognize the microphone device access and transfer the microphone function to the connector 100 through the headphone jack. Then, the protection circuit 200 can remove the microphone function transferred to the connector 100, so that the microphone function of the mobile terminal is removed. The mobile terminal connected to the protection device does not have a microphone function, and thus the mobile terminal cannot be eavesdropped on by the microphone. The protection device prevents the microphone eavesdropping of the mobile terminal.

[0026] In this embodiment, through the connected connector 100 and protection circuit 200, when the connector 100 is connected to the headphone jack of the mobile terminal, the mobile terminal transfers its microphone function to the connector 100 via the headphone jack. The protection circuit 200 then removes the microphone function from the connector 100, thus preventing the mobile terminal from having a microphone and achieving the technical effect of preventing microphone eavesdropping. This application has a simple structure and low cost, eliminates the need to transmit interfering audio via ultrasound, and avoids long-term exposure of users to an ultrasonic environment. This achieves the technical effects of reducing anti-eavesdropping costs, improving anti-eavesdropping effectiveness, and enhancing user experience. It can also prevent microphone eavesdropping on the mobile terminal and protect the privacy and security of the mobile terminal when connected to the headphone jack.

[0027] In some embodiments, the protection circuit 200 includes an auxiliary identification circuit 210 and a dummy microphone circuit 220, and the connector 100 includes a first identification port 110 and a first microphone function port 120. The auxiliary identification circuit 210 is connected to the first identification port 110, and the dummy microphone circuit 220 is connected to the first microphone function port 120. The auxiliary identification circuit 210 is used to enable the mobile terminal to transfer the microphone function to the first microphone function port 120, and the pseudo-microphone circuit 220 is used to remove the microphone function of the first microphone function port 120.

[0028] Specifically, the headphone jack of the mobile terminal includes a second identification port and a second microphone function port. When the connector 100 is connected to the headphone jack, the first identification port 110 and the second identification port are connected, and the first microphone function port 120 is connected to the second microphone function port. The mobile terminal determines whether a device with microphone function is connected through the second identification port, and then transfers the microphone function of the mobile terminal to the first microphone function port 120 through the second microphone function port.

[0029] The auxiliary identification circuit 210 assists the connector 100 in determining that the second identification port is connected to a device with a microphone function. The fake microphone circuit 220 is connected to the first microphone function port 120 to remove the microphone function of the first microphone function port 120, thereby making the microphone function of the mobile terminal disappear and the mobile terminal not have a radio function, thus fundamentally preventing the mobile terminal from being eavesdropped.

[0030] It should be noted that the pseudo-microphone circuit 220 is a circuit without microphone function. After the pseudo-microphone circuit 220 takes over the microphone function, the microphone function cannot be activated, and thus the pseudo-microphone circuit 220 can eliminate the microphone function.

[0031] In this embodiment, the auxiliary identification circuit 210 and the fake microphone circuit 220 work together to transfer the microphone function of the mobile terminal and prevent the microphone function from being activated, thereby eliminating the microphone function and preventing the mobile terminal from having a radio function, thus fundamentally preventing the mobile terminal from eavesdropping.

[0032] In some embodiments, such as Figure 1 As shown, the pseudo microphone circuit 220 includes a first resistor 221, one end of which is connected to the first microphone function port 120, and the other end of which is grounded.

[0033] Specifically, the first resistor 221 is configured to take over the microphone function of the mobile terminal that is taken over by the first microphone function port 120. However, since the first resistor 221 does not have a microphone function, the microphone function of the mobile terminal cannot be activated. As a result, the microphone function of the mobile terminal disappears under the action of the protection device, thereby achieving the purpose of preventing the mobile terminal from being eavesdropped on.

[0034] It should be noted that the resistance value of the first resistor 221 is equivalent to that of a real microphone, which enables the mobile terminal to determine that the first resistor 221 is a real microphone, thus improving the accuracy of the protection device.

[0035] The resistance of the first resistor 221 is 2200±100Ω. In some embodiments, such as Figure 2 As shown, the pseudo microphone circuit 220 includes a pseudo microphone device 222, one end of which is connected to the first microphone function port 120, and the other end of which is grounded. The pseudo-microphone device 222 does not have a microphone function.

[0036] Specifically, the fake microphone device 222 is a microphone without microphone function. Connecting it to the first microphone function port 120 enables the mobile terminal to determine that it is connected to a real microphone, which helps to improve the accuracy of the protection device. Since the fake microphone device 222 does not have microphone function, the microphone function of the mobile terminal cannot be activated and used, thereby eliminating the microphone function of the mobile terminal and preventing the mobile terminal from being eavesdropped on.

[0037] In some embodiments, the pseudo-microphone circuit 220 further includes a second resistor 223, one end of which is connected to the first microphone function port 120, and the other end of which is grounded.

[0038] Specifically, the second resistor 223 can improve the redundancy of the pseudo microphone circuit 220, and prevent the protection device from being unable to eliminate the microphone function of the mobile terminal when the connection between the pseudo microphone device 222 and the first microphone function port 120 is interrupted. The setting of the second resistor 223 can eliminate the microphone function of the first microphone function port 120 when the pseudo microphone device 222 fails, thereby improving the redundancy and practicality of the protection device.

[0039] In some embodiments, the pseudo-microphone circuit 220 further includes a first capacitor 224, which is located between the first microphone function port 120 and the second resistor 223.

[0040] Specifically, the first capacitor 224 can store charge when the pseudo microphone device 222 is operating normally. When the pseudo microphone device 222 is interrupted, the first capacitor 224 can release its stored charge to the second resistor 223, so that the microphone function of the first microphone function port 120 is transferred to the pseudo microphone circuit 220, and the microphone function of the mobile terminal is eliminated. This helps to improve the redundancy and reliability of the pseudo microphone circuit 220, thereby improving the reliability of the protection device.

[0041] In some embodiments, such as Figure 3As shown, the protection device also includes a housing 300, which covers the periphery of the protection circuit 200. The housing 300 has an opening, through which the connection connector 100 is connected to the protection circuit 200.

[0042] Specifically, the housing 300 is used to cover the protection circuit 200, preventing the protection circuit 200 from being exposed and affecting the service life of the protection device. It also prevents direct contact between the user and the protection circuit 200 during use, thus avoiding electrical leakage and ensuring safety. The opening of the housing 300 allows the connector 100 to pass through. One end of the connector 100 inside the housing 300 connects to the protection circuit 200, while the portion of the connector 100 outside the housing 300 connects to the headphone jack of the mobile terminal.

[0043] In some embodiments, the auxiliary identification circuit 210 includes a third resistor 211, one end of which is connected to the first identification port 110, and the other end of which is grounded.

[0044] Specifically, the third resistor 211 is used to enable the mobile terminal to recognize the microphone access through the first identification port 110 and the second identification port, thereby transferring the microphone function to the first microphone function port 120 of the connector 100. The third resistor 211 has the same resistance value as when the microphone or a headset with microphone function is connected to the mobile terminal, so as to ensure that the mobile terminal can recognize the protection device as a microphone, thereby transferring the microphone function, which helps to improve the practicality of the protection device.

[0045] It should be noted that the resistance of the third resistor 211 is 5100±100Ω.

[0046] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this application (including the claims) is limited to these examples; within the framework of this invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in the details for the sake of brevity.

[0047] The embodiments of this invention are intended to cover all such substitutions, modifications, and variations falling within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A protective device for preventing eavesdropping via a mobile terminal's microphone, characterized in that, include: A connector for connecting to the headphone jack of a mobile terminal, wherein the headphone jack is an interface capable of transferring the microphone function of the mobile terminal; A protection circuit is connected to the connector to connect to the headphone jack of the mobile terminal via the connector, so that the mobile terminal can transfer the microphone function to the connector via the headphone jack. The protection circuit can remove the microphone function of the connector.

2. The protective device for preventing mobile terminal microphone eavesdropping according to claim 1, characterized in that, The protection circuit includes an auxiliary identification circuit and a fake microphone circuit. The connector includes a first identification port and a first microphone function port. The auxiliary identification circuit is connected to the first identification port, and the fake microphone circuit is connected to the first microphone function port. The auxiliary identification circuit is used to enable the mobile terminal to transfer the microphone function to the first microphone function port, and the pseudo-microphone circuit is used to remove the microphone function of the first microphone function port.

3. The protective device for preventing mobile terminal microphone eavesdropping according to claim 2, characterized in that, The pseudo-microphone circuit includes a first resistor, one end of which is connected to the first microphone function port, and the other end of which is grounded.

4. The protective device for preventing mobile terminal microphone eavesdropping according to claim 2, characterized in that, The pseudo-microphone circuit includes a pseudo-microphone device, one end of which is connected to the first microphone function port, and the other end of which is grounded. The pseudo-microphone device does not have microphone functionality.

5. The protective device for preventing mobile terminal microphone eavesdropping according to claim 4, characterized in that, The pseudo-microphone circuit also includes a second resistor, one end of which is connected to the first microphone function port, and the other end of which is grounded.

6. The protective device for preventing mobile terminal microphone eavesdropping according to claim 5, characterized in that, The pseudo-microphone circuit also includes a first capacitor, which is located between the first microphone function port and the second resistor.

7. The protective device for preventing mobile terminal microphone eavesdropping according to claim 1, characterized in that, It also includes a housing that covers the periphery of the protection circuit, the housing having an opening through which the connection connector is connected to the protection circuit.

8. The protective device for preventing mobile terminal microphone eavesdropping according to claim 2, characterized in that, The auxiliary identification circuit includes a third resistor, one end of which is connected to the first identification port, and the other end of which is grounded.

9. The protective device for preventing mobile terminal microphone eavesdropping according to claim 3, characterized in that, The resistance of the first resistor is 2200±100Ω.

10. The protective device for preventing mobile terminal microphone eavesdropping according to claim 8, characterized in that, The resistance of the third resistor is 5100±100Ω.

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