Terminal anti-eavesdropping device and system thereof

Abstract

The utility model relates to the technical field of eavesdropping prevention, and relates to a terminal anti-eavesdropping device and a system thereof. The device comprises a first connection module, an audio management module, a power management chip, a battery module and a switching module, and the first connection module is used for establishing communication connection with an external terminal to obtain the audio control authority of the external terminal; a battery connecting end of the power management chip is connected with the battery module, a first voltage output end is connected with the first connecting module, an external terminal can be charged through the first connecting module, and a data transmission end of the power management chip is connected with a first input end of the switching module; the data transmission end of the audio management module is connected with the second input end of the switching module, and an audio signal is preset in the audio management module and can be transmitted to an external terminal through the first connection module; the output end of the switching module is connected with the first connecting module, and the switching module is used for connecting the first input end or the second input end of the switching module to the output end. The method and the device have rich functions.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of anti-interception technology, especially a terminal anti-interception device and system. BACKGROUND

[0002] With the progress of science and technology and the development of society, intelligent terminals such as mobile phones and notebooks have brought great convenience to people's lives and have become an indispensable part of people's lives.

[0003] The software installed on the intelligent terminal can call the microphone of the terminal to record, conveniently and quickly obtain the information of the user, and process the information. However, since the user cannot perceive whether the microphone is called for recording by the mobile phone application, the user's private conversation or audio data may be maliciously intercepted.

[0004] In view of the above problems, the user can close the microphone permission of the corresponding software in the background operation of the intelligent terminal, or connect the terminal anti-interception device with the intelligent terminal, collect the sound signals of the use environment of the intelligent terminal, and transmit the sound signals to the intelligent terminal after processing, to realize anti-interception. However, the existing terminal anti-interception device only has the function of anti-interception, and the function is relatively single. UTILITY MODEL CONTENT

[0005] The technical problem to be solved by the embodiments of the utility model lies in providing a terminal anti-interception device and system to solve the problem of single function of the terminal anti-interception device in the prior art.

[0006] The utility model discloses a terminal anti-interception device, including first connecting module, audio management module, power management chip, battery module and switching module, wherein,

[0007] The first connecting module is used for establishing a communication connection with an external terminal to obtain the audio control authority of the external terminal;

[0008] The battery connection end of the power management chip is connected with the battery module, the first voltage output end is connected with the first connecting module, and the power management chip can charge the external terminal through the first connecting module, and the data transmission end of the power management chip is connected with the first input end of the switching module;

[0009] The data transmission end of the audio management module is connected with the second input end of the switching module, the audio management module is built-in preset audio signal, and the preset audio signal can be transmitted to the external terminal through the first connecting module;

[0010] The output end of the switching module is connected with the first connecting module, and the switching module is used for connecting the first input end or the second input end to the output end.

[0011] Optionally, the terminal anti-eavesdropping device further comprises an anti-backflow circuit module, a driving end of the anti-backflow circuit module is connected to a control end of the switching module, an input end of the anti-backflow circuit module is connected to a first voltage output end of the power management chip, and an output end of the anti-backflow circuit module is connected to the first connection module.

[0012] Optionally, the switching module comprises a switching switch, an analog switch chip and a control grounding unit, a fixed end of the switching switch is connected to a control end of the analog switch chip and a driving end of the anti-backflow circuit module, a first moving end is connected to a power supply end of the power management chip, and a second moving end is grounded, the switching switch is operated to connect the first moving end or the second moving end to the fixed end, an output end of the analog switch chip is connected to the first connection module, a first input end is connected to a data transmission end of the power management chip, and a second input end is connected to a data transmission end of the audio management module, the first connection module comprises a type-C connector or a lighting connector, the type-C connector or the lighting connector is provided with a first communication pin and a second communication pin, the first communication pin is used to establish a communication connection with an external terminal, and the second communication pin can be grounded through the control grounding unit.

[0013] Optionally, the anti-backflow circuit module comprises a first MOS tube, a second MOS tube, a first triode, a second triode, a first pull-up resistor and a second pull-up resistor, a gate of the first MOS tube is connected to one end of the first pull-up resistor and a collector of the first triode, a drain of the first MOS tube is connected to the first connection module and the other end of the first pull-up resistor, a source of the first MOS tube is connected to a source of the second MOS tube, a gate of the second MOS tube is connected to a collector of the second triode and one end of the second pull-up resistor, a drain of the second MOS tube is connected to a first voltage output end of the power management chip and the other end of the second pull-up resistor, and a base of the first triode and a base of the second triode are both connected to a control end of the analog switch chip.

[0014] Optionally, the control grounding unit comprises a third triode and a third MOS tube, a base of the third triode is connected to the fixed end of the switching switch, an emitter is connected to the power supply end of the power management chip, a collector is connected to a gate of the third MOS tube and a ground end, a source of the third MOS tube is grounded, and a drain is connected to the second communication pin.

[0015] Optionally, the terminal anti-eavesdropping device further comprises a charging interface, the charging interface is connected to a voltage input end of the power management chip, and the charging interface is used to connect an external adapter.

[0016] Optionally, the terminal anti-interception device further comprises a second connection module, the second connection module is connected with the second voltage output end of the power management chip, and the second connection module is used for charging an external device.

[0017] Optionally, the audio management module comprises a DSP chip, and a data transmission end of the DSP chip is connected with the second input end of the switching module.

[0018] Optionally, the terminal anti-interception device further comprises a voltage stabilizing module, an input end of the voltage stabilizing module is connected with the first connection module, and an output end of the voltage stabilizing module is connected with the power supply end of the audio management module.

[0019] The utility model discloses a kind of terminal anti-interception systems, including terminal and the terminal anti-interception device as any one of claims 1-9, the terminal can with the first connection module of the terminal anti-interception device Establish communication connection, and receive preset audio signal, and obtain electric energy.

[0020] Compared with prior art, the terminal anti-interception device provided in the utility model embodiment has the beneficial effects that: by setting the first connection module, the audio management module, the power management chip, the battery module and the switching module, the audio management module is built-in preset audio signal, and in the case that the second input end of the switching module is connected to the output end of itself, the preset audio signal is transmitted to external terminal through the first connection module, the external terminal is simulated in the case that no microphone is set, and the preset audio signal built-in is returned to external terminal, interception is prevented, and the power management chip can obtain electric energy from the battery module and in the case that the first input end of the switching module is connected to the output end of itself, external terminal is charged through the first connection module, so that the terminal anti-interception device of the application has the function of mobile power supply on the basis of preventing interception, and can charge external terminal, user can switch and select anti-interception function or mobile power supply function, has more abundant function, and has better user experience. BRIEF DESCRIPTION OF DRAWINGS

[0021] The technical solutions of the utility model will be described in further detail below with reference to the drawings and embodiments, and in the drawings:

[0022] Figure 1 It is the structure block diagram of one embodiment of the terminal anti-interception device provided by the utility model;

[0023] Figure 2 It is the brief circuit schematic diagram of another embodiment of the terminal anti-interception device provided by the utility model;

[0024] Figure 3 It is the circuit principle diagram of one embodiment that power management chip is connected with first connection module, second connection module and charging interface.

[0025] Figure 4 is a circuit schematic diagram of an embodiment of the battery module provided by the utility model;

[0026] Figure 5 is a circuit schematic diagram of an embodiment of the switching module provided by the utility model;

[0027] Figure 6 is a circuit schematic diagram of an embodiment of the anti-inversion circuit module provided by the utility model;

[0028] Figure 7 is a circuit schematic diagram of an embodiment of the voltage stabilizing module provided by the utility model;

[0029] Figures 8A-8D is a circuit schematic diagram of an embodiment of the audio management module provided by the utility model.

[0030] The reference signs in the drawings are as follows:

[0031] 110, first connection module; 120, audio management module; 130 (U1), power management chip; 140, battery module; 150, switching module; 151, control ground unit; 160, anti-inversion circuit module; 170, charging interface; 180, second connection module; 190, voltage stabilizing module;

[0032] S1, switching switch; U2, analog switch chip; J1, type-C connector; J2, USB-C interface; Q1, first MOS tube; Q2, second MOS tube; Q3, first triode; Q4, second triode; Q5, third triode; Q6, third MOS tube; R1, first pull-up resistor; R2, second pull-up resistor; U3, DSP chip. DETAILED DESCRIPTION

[0033] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. Now, the preferred embodiments of the utility model will be described in detail in combination with the drawings.

[0034] The utility model embodiment provides a kind of terminal anti-interception device, such as Figure 1 And Figure 2 It is shown that terminal anti-interception device includes first connection module 110, audio management module 120, power management chip 130 (U1), battery module 140 and switching module 150.

[0035] First connection module 110 is used to establish communication connection with external terminal, to obtain the audio control authority of external terminal.

[0036] The battery connecting end of the power management chip 130 (U1) is connected with the battery module 140, the first voltage output end is connected with the first connecting module 110, and the first connecting module 110 can charge the external terminal, the data transmission end of the power management chip 130 (U1) is connected with the first input end of the switching module 150. The data transmission end of the power management chip 130 (U1) is pin DPA1 and DPA2 as shown in the figure, and the battery connecting end is pin LX and BST. Figure 3

[0037] The data transmission end of the audio management module 120 is connected with the second input end of the switching module 150, the audio management module 120 is built-in preset audio signals, and the preset audio signals can be transmitted to the external terminal through the first connecting module 110.

[0038] The output end of the switching module 150 is connected with the first connecting module 110, and the switching module 150 is used for connecting the first input end or the second input end to the output end.

[0039] The first connecting module 110, the audio management module 120, the power management chip 130 (U1), the battery module 140 and the switching module 150 are arranged, the audio management module 120 is built-in preset audio signals, and the preset audio signals can be transmitted to the external terminal through the first connecting module 110 when the second input end of the switching module 150 is connected to the output end, the external microphone of the external terminal is simulated without setting the microphone, and the preset audio signals are returned to the external terminal, the anti-eavesdropping is realized, the power management chip 130 (U1) can obtain the power from the battery module 140 and charge the external terminal through the first connecting module 110 when the first input end of the switching module 150 is connected to the output end, therefore, the terminal anti-eavesdropping device has the functions of the anti-eavesdropping and the mobile power supply, can charge the external terminal, the user can switch to select the anti-eavesdropping function or the mobile power supply function, has more abundant functions, and has better user experience.

[0040] The audio control permission of the terminal refers to the permission of the terminal to obtain the external audio signal. Specifically, when the terminal does not establish a communication connection with the external device, the terminal takes the built-in microphone as the input source of the external audio signal, when the terminal is in communication connection with the terminal anti-eavesdropping device, the first connecting module 110 of the terminal anti-eavesdropping device obtains the audio control permission of the terminal, and the terminal takes the terminal anti-eavesdropping device as the input source of the external audio signal. In this process, the terminal can automatically switch to the terminal anti-eavesdropping device as the input source after establishing a communication connection with the connecting module, or prompt the user to manually set the switch. The terminal can be a terminal device such as a mobile phone, a tablet computer, a smart bracelet and the like.

[0041] ​The terminal anti-eavesdropping device can establish a communication connection with the external terminal through the first connection module 110. The first connection module 110 supports an audio transmission protocol and can perform handshake communication with the external terminal. The external terminal switches an audio input source to the terminal anti-eavesdropping device, and the terminal anti-eavesdropping device can obtain audio control authority of the external terminal.

[0042] The power management chip 130 (U1) is a high-integration circuit chip. The power management chip 130 (U1) has multiple functions, including battery charging management, battery protection, power conversion, voltage stabilization, etc. Through the power management chip 130 (U1), the terminal anti-eavesdropping device can obtain power from the internal battery module 140, and then charge the external terminal through the first connection module 110. In addition, based on the second connection module 180, the terminal anti-eavesdropping device can charge external equipment through the second connection module 180. The power management chip 130 (U1) can be of the MP5043, MP5045, IP5389, etc. The battery connection end of the power management chip 130 (U1) is shown as pin LX, BST, which can be indirectly connected to the battery module 140. The circuit schematic diagram of the power management chip 130 (U1) is shown in Figure 3 .

[0043] The battery module 140 can be a lithium-ion battery, a lithium polymer battery, a nickel-hydrogen battery, a polymer zinc battery, etc. The circuit schematic diagram of the battery module 140 is shown in Figure 4 .

[0044] Referring to Figure 1 , the terminal anti-eavesdropping device further includes an anti-backflow circuit module 160. The driving end of the anti-backflow circuit module 160 is connected to the control end of the switching module 150. The input end of the anti-backflow circuit module 160 is connected to the first voltage output end of the power management chip 130 (U1). The output end of the anti-backflow circuit module 160 is connected to the first connection module 110.

[0045] By setting the anti-backflow circuit, current is allowed to pass when the power polarity is correct, and current is blocked when the polarity is wrong, preventing energy from flowing back, which can effectively prevent the energy of the external terminal from flowing to the power management chip 130 (U1), causing damage to the power management chip 130 (U1), ensuring the normal operation of the power management chip 130 (U1), and improving the stability of the terminal anti-eavesdropping device.

[0046] Optionally, referring to Figure 2 , Figure 3 and Figure 5The switching module 150 comprises a switching switch S1, an analog switch chip U2 and a control grounding unit 151. The fixed terminal of the switching switch S1 is connected to the control terminal of the analog switch chip U2 and the driving terminal of the anti-backflow circuit module 160. The first movable terminal is connected to the power supply terminal of the power management chip 130 (U1), and the second movable terminal is grounded. The switching switch S1 is operated to connect the first movable terminal or the second movable terminal to the fixed terminal. The output terminal of the analog switch chip U2 is connected to the first connection module 110. The first input terminal is connected to the data transmission terminal of the audio management module 120, and the second input terminal is connected to the data transmission terminal of the power management chip 130 (U1). The first connection module 110 comprises a type-C connector J1 or a lighting connector. The type-C connector J1 or the lighting connector is provided with a first communication pin CC1 and a second communication pin CC2. The first communication pin CC1 is used to establish a communication connection with an external terminal, and the second communication pin CC2 can be grounded through the control grounding unit 151.

[0047] The first connection module 110 can be a type-C connector J1 or a lighting connector. The type-C connector J1 or the lighting connector supports an audio transmission protocol. When the type-C connector J1 or the lighting connector is inserted into an external interface of an external terminal, the external terminal establishes a communication connection with the type-C connector J1 or the lighting connector. The type-C connector J1 or the lighting connector can transmit a preset audio signal to the external terminal or charge the external terminal. The type-C connector J1 or the lighting connector is provided with a first communication pin CC1 and a second communication pin CC2. The first communication pin CC1 is used to establish a communication connection with an external terminal, and the second communication pin CC2 can be grounded through the control grounding unit 151. Preferably, the first connection module 110 adopts a type-C connector J1, and the type-C connector J1 is provided with a first communication pin CC1 and a second communication pin CC2.

[0048] The switching switch S1 can adopt a toggle switch, a knob switch, a sliding switch, a rocker switch or the like.

[0049] The analog switch chip U2 is a common integrated circuit element and can realize switching of channels. The analog switch chip U2 can specifically adopt an SGM7229YUWQ10G / TR chip. The output terminal of the analog switch chip U2 is a pin D+, D- as shown in Figure 5 The first input terminal is a pin HSD2+, HSD2-, and the second input terminal is a pin HSD1+, HSD1-.

[0050] The user can operate the switch S1 to connect the fixed terminal of the switch S1 to the first movable terminal or the second movable terminal according to the requirement, and the analog switch chip U2 switches the channel based on the switching connection of the first movable terminal or the second movable terminal in the switch S1, so as to realize the switching of the anti-eavesdropping function and the mobile power supply function. Specifically, when the fixed terminal of the switch S1 is connected to the first movable terminal, the control terminal of the analog switch chip U2 is connected to the power terminal of the power management chip 130 (U1), the level is pulled high, the output terminal of the analog switch chip U2 is connected to the first input terminal of itself, so that the data transmission terminal of the power management chip 130 (U1) is connected to the first connection module 110, and the power management chip 130 (U1) can charge the external terminal through the first connection module 110. When the fixed terminal of the switch S1 is connected to the second movable terminal, the control terminal of the analog switch chip U2 is grounded, the level is pulled low, the output terminal of the analog switch chip U2 is connected to the second input terminal of itself, so that the data transmission terminal of the audio management module 120 is connected to the first connection module 110, and at the same time, the second communication pin CC2 of the type-C connector J1 or the lighting connector is grounded through the control grounding unit 151, and the audio management module 120 can transmit the preset audio signal to the external terminal through the first connection module 110.

[0051] Optionally, in the embodiment, with reference to Figure 1 、 Figure 2 and Figure 6 , the anti-backflow circuit module 160 includes a first MOS tube Q1, a second MOS tube Q2, a first triode Q3, a second triode Q4, a first pull-up resistor R1 and a second pull-up resistor R2, the gate of the first MOS tube Q1 is connected to one end of the first pull-up resistor R1 and the collector of the first triode Q3, the drain of the first MOS tube Q1 is connected to the first connection module 110 and the other end of the first pull-up resistor R1, the source of the first MOS tube Q1 is connected to the source of the second MOS tube Q2, the gate of the second MOS tube Q2 is connected to the collector of the second triode Q4 and one end of the second pull-up resistor R2, the drain of the second MOS tube Q2 is connected to the first voltage output terminal of the power management chip and the other end of the second pull-up resistor R2, and the base of the first triode Q3 and the base of the second triode Q4 are both connected to the control terminal of the analog switch chip U2.

[0052] In specific implementation, the first MOS tube Q1 and the second MOS tube Q2 are both PMOS tubes, and the first triode Q3 and the second triode Q4 are both NPN triodes.

[0053] The first MOS tube Q1, the second MOS tube Q2, the first triode Q3, the second triode Q4, the first pull-up resistor R1 and the second pull-up resistor R2 are arranged to construct the anti-inrush circuit module 160, so that the energy of the external terminal is prevented from flowing back to the power management chip 130 (U1), and the circuit structure is simple. In specific work, when the fixed terminal of the switching switch S1 is connected to the first movable terminal, the level of the control terminal of the analog switch chip U2 is pulled high, the first triode Q3 and the second triode Q4 are in the conducting state, the gate voltage of the first MOS tube Q1 and the gate voltage of the second MOS tube Q2 are both pulled low, the first MOS tube Q1 and the second MOS tube Q2 are both turned on, and the power management chip 130 (U1) can charge the external terminal through the first connection module 110; when the voltage of the external terminal is higher than the voltage of the voltage output terminal of the power management chip 130 (U1), the first MOS tube Q1 and the second MOS tube Q2 are both in the cut-off state. When the fixed terminal of the switching switch S1 is connected to the first movable terminal, the level of the control terminal of the analog switch chip U2 is pulled low, the first MOS tube Q1, the second MOS tube Q2, the first triode Q3 and the second triode Q4 are all in the cut-off state.

[0054] With reference to Figure 3 and Figure 5 In optional embodiments of the present application, the control grounding unit 151 includes a third triode Q5 and a third MOS tube Q6. The base of the third triode Q5 is connected to the fixed terminal of the switching switch S1, the emitter is connected to the power terminal of the power management chip 130 (U1), the collector is connected to the gate of the third MOS tube Q6 and the ground terminal, the source of the third MOS tube Q6 is grounded, and the drain is connected to the second communication pin CC2.

[0055] In specific implementation, the third triode Q5 is a PNP triode, and the third MOS tube Q6 is an NMOS tube.

[0056] By arranging the third triode Q5 and the third MOS tube Q6, the second communication pin CC2 of the type-C connector J1 can be synchronously switched to be grounded based on the switching operation of the switching switch S1, so that the audio management module 120 can transmit the preset audio signal to the external terminal through the type-C connector J1.

[0057] With reference to Figures 1 to 3 In optional embodiments of the present application, the terminal anti-eavesdropping device further includes a charging interface 170, which is connected to the voltage input terminal of the power management chip 130 (U1), and is used to connect an external adapter.

[0058] By setting the charging interface 170, the charging interface 170 can be connected to an external adapter to obtain electric energy, and then charge the battery module 140 through the power management chip 130 (U1), so that the battery module 140 maintains sufficient power, and therefore, the terminal anti-eavesdropping device can be charged and used in a cycle, without the need to replace the battery, and has high use convenience.

[0059] In specific implementation, the charging interface 170 can be a USB-A interface, a USB-C interface J2, or the like, and can be connected to an external adapter. Preferably, the charging interface 170 adopts the USB-C interface J2.

[0060] Reference Figures 1 to 3 In optional embodiments of the present application, the terminal anti-eavesdropping device further includes a second connection module 180 connected to a second voltage output end of the power management chip 130 (U1), and the second connection module 180 is configured to charge an external device.

[0061] By setting the second connection module 180, the terminal anti-eavesdropping device can be connected to an external device, and the power management chip 130 (U1) can charge the external device through the second connection module 180. The external device is a terminal device.

[0062] Optionally, the second connection module 180 can adopt a type-C connector, a lighting connector, a Micro USB connector, or the like, which can be connected to an external device and can charge the external device. Preferably, the second connection module 180 adopts the type-C connector J3.

[0063] In optional embodiments of the present application, the audio management module 120 includes a DSP chip U3, and a data transmission end of the DSP chip U3 is connected to a first input end of the switching module 150. The data transmission end of the DSP chip U3 is a pin USB_DM and USB_DP as shown in Figure 8A .

[0064] The DSP chip U3 can pre-store a preset audio signal. The preset audio signal can be white noise, color noise, or other types of noise, or an audio file. These noises and audio files are pre-recorded and stored in the DSP chip U3. The DSP chip U3 can specifically adopt an SNC8X series chip. A circuit schematic diagram of the DSP chip U3 is shown in Figures 8A-8D .

[0065] Wherein, the equiprobable random number sequence can be generated by a pseudo-random number generator, the random number sequence is directly output as a waveform output white noise, or the random number sequence is mapped to a specific voltage or audio value and output as white noise, or the random noise is generated by an inverse FFT method or an inverse convolution method, and the random noise is pre-stored in the DSP chip U3. The random noise is generated by the inverse FFT method, specifically, a set of random frequency domain data is generated, and then the generated frequency domain data is converted back to time domain data by inverse FFT, to generate random noise with specific spectral characteristics. The inverse convolution method is used to generate random noise with specific spectral characteristics by convolution inverse operation of a specific signal. The random noise generated by the inverse convolution method can generate noise signals with specific spectral characteristics by adjusting the spectral characteristics of the convolution kernel in the convolution inverse operation. The noise generated by the above method is pre-stored in the DSP chip U3. Of course, the preset audio signal can also be a blank audio signal, and the blank audio signal can be formed by generating a data stream with all output values being zero, and the blank audio signal is pre-stored in the DSP chip U3 and can be transmitted to an external terminal through the first connection module 110 and captured and recognized by the external terminal.

[0066] Reference Figure 1 , Figure 7 , Figures 8A to 8D In an optional embodiment of the present application, the terminal anti-eavesdropping device further comprises a voltage stabilizing module 190, the input end of the voltage stabilizing module 190 is connected to the first connection module 110, and the output end is connected to the power supply end of the audio management module 120.

[0067] The voltage stabilizing module 190 can perform voltage stabilizing operation on the voltage taken from the external terminal, so as to ensure that the output voltage is always stable within the set value range when the input voltage fluctuates or changes, and provide stable working voltage for the audio management module 120. The circuit principle diagram of the voltage stabilizing module 190 is shown in Figure 7 .

[0068] The present application also provides a terminal anti-eavesdropping system, which comprises a terminal and a terminal anti-eavesdropping device as described above, the terminal can establish communication connection with the first connection module 110 of the terminal anti-eavesdropping device, receive the preset audio signal, and obtain electric energy.

[0069] The terminal anti-eavesdropping device of the terminal anti-eavesdropping system of the application is provided with a first connecting module 110, an audio management module 120, a power management chip 130 (U1), a battery module 140 and a switching module 150, the audio management module 120 is internally provided with preset audio signals, and in the case that the second input end of the switching module 150 is connected to the output end of the audio management module 120, the preset audio signals can be transmitted to the terminal through the first connecting module 110, the external microphone of the terminal is simulated in the case that no microphone is provided, and the preset audio signals internally provided are returned to the terminal, the anti-eavesdropping is realized, and the power management chip 130 (U1) can obtain electric energy from the battery module 140 and charge the terminal through the first connecting module 110 in the case that the first input end of the switching module 150 is connected to the output end of the power management chip 130 (U1), therefore, the terminal anti-eavesdropping device of the application has the function of a mobile power supply on the basis of anti-eavesdropping, can charge the terminal, the user can switch and select the anti-eavesdropping function or the mobile power supply function, has more abundant functions, and has better user experience.

[0070] It should be understood that the above embodiments are only used to illustrate the technical solutions of the application, rather than limit them, and the technical solutions recorded in the above embodiments can be modified by those skilled in the art, or some technical features can be replaced by equivalents; all these modifications and replacements should belong to the protection scope of the claims of the application.

Claims

1. A terminal anti-eavesdropping device, characterized by comprising: The terminal anti-eavesdropping device comprises a first connection module, an audio management module, a power management chip, a battery module and a switching module, wherein, the first connection module is used to establish a communication connection with an external terminal to obtain the audio control authority of the external terminal; the battery connection end of the power management chip is connected with the battery module, the first voltage output end is connected with the first connection module, and the power management chip can charge the external terminal through the first connection module; the data transmission end of the power management chip is connected with the first input end of the switching module; the data transmission end of the audio management module is connected with the second input end of the switching module, the audio management module is internally provided with preset audio signals, and the preset audio signals can be transmitted to the external terminal through the first connection module; the output end of the switching module is connected with the first connection module, and the switching module is used to connect the first input end or the second input end thereof to the output end.

2. The terminal anti-eavesdropping device according to claim 1, characterized by The terminal anti-eavesdropping device further comprises an anti-backflow circuit module, the driving end of the anti-backflow circuit module is connected with the control end of the switching module, the input end of the anti-backflow circuit module is connected with the first voltage output end of the power management chip, and the output end of the anti-backflow circuit module is connected with the first connection module.

3. The terminal anti-eavesdropping device according to claim 2, characterized by The switching module comprises a switching switch, an analog switch chip and a control grounding unit, the fixed end of the switching switch is connected with the control end of the analog switch chip and the driving end of the anti-backflow circuit module, the first movable end is connected with the power supply end of the power management chip, and the second movable end is grounded; the switching switch is operated to connect the first movable end or the second movable end to the fixed end; the output end of the analog switch chip is connected with the first connection module, the first input end is connected with the data transmission end of the power management chip, and the second input end is connected with the data transmission end of the audio management module; the first connection module comprises a type-C connector or a lighting connector, the type-C connector or the lighting connector is provided with a first communication pin and a second communication pin, the first communication pin is used to establish a communication connection with an external terminal, and the second communication pin can be grounded through the control grounding unit.

4. The terminal anti-eavesdropping device according to claim 3, characterized by The anti-backflow circuit module comprises a first MOS tube, a second MOS tube, a first triode, a second triode, a first pull-up resistor and a second pull-up resistor; the gate of the first MOS tube is connected with one end of the first pull-up resistor and the collector of the first triode; the drain of the first MOS tube is connected with the first connection module and the other end of the first pull-up resistor; the source of the first MOS tube is connected with the source of the second MOS tube; the gate of the second MOS tube is connected with the collector of the second triode and one end of the second pull-up resistor; the drain of the second MOS tube is connected with the first voltage output end of the power management chip and the other end of the second pull-up resistor; the base of the first triode and the base of the second triode are both connected with the control end of the analog switch chip.

5. The terminal anti-eavesdropping device according to claim 3, characterized by The control grounding unit comprises a third triode and a third MOS tube, the base of the third triode is connected with the fixed end of the switching switch, the emitter is connected with the power supply end of the power management chip, the collector is connected with the gate of the third MOS tube and the ground end, the source of the third MOS tube is grounded, and the drain is connected with the second communication pin.

6. A terminal anti-eavesdropping device according to any one of claims 1 to 5, characterized in that, The terminal anti-interception device further comprises a charging interface, the charging interface is connected with the voltage input end of the power management chip, and the charging interface is used for connecting an external adapter.

7. The terminal anti-eavesdropping device according to claim 6, characterized by The terminal anti-interception device further comprises a second connection module, the second connection module is connected with the second voltage output end of the power management chip, and the second connection module is used for charging an external device.

8. The terminal anti-eavesdropping device according to claim 6, characterized by The audio management module comprises a DSP chip, and the data transmission end of the DSP chip is connected with the second input end of the switching module.

9. The terminal anti-eavesdropping device according to claim 6, characterized by The terminal anti-interception device further comprises a voltage stabilizing module, the input end of the voltage stabilizing module is connected with the first connection module, and the output end is connected with the power supply end of the audio management module.

10. A terminal anti-eavesdropping system characterized by comprising: The terminal anti-interception device comprises a terminal and the terminal anti-interception device as claimed in any one of claims 1-9, the terminal can be connected with the first connection module of the terminal anti-interception device to establish a communication connection, receive a preset audio signal, and obtain electric energy.

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