Voice shielding box based on ultrasonic interference

Abstract

The utility model discloses a voice shielding box based on ultrasonic interference, relates to the technical field of voice shielding, and aims to solve the problem that electronic equipment is inconvenient to put in and take out. The voice shielding box comprises a shell, a drawing structure and a plurality of ultrasonic probes. Along the length direction of the voice shielding box, the shell has two opposite sides, and at least one side is provided with an opening. In the length direction of the voice shielding box, the drawing structure is in sliding connection with the shell, and the drawing structure is used for being pulled out of or sliding into the shell through the opening; the drawing structure is provided with a limiting groove, and the limiting groove is used for containing a part of the electronic equipment and limiting the electronic equipment. The ultrasonic probes are arranged on the inner wall of the shell, distributed on the two sides of the drawing structure in the width direction of the voice shielding box and used for sending ultrasonic waves to the limiting grooves. The voice shielding box provided by the utility model is used for preventing voice eavesdropping, and the electronic equipment is convenient to put in and take out.

Description

Technical Field

[0001] The utility model relates to the technical field of voice shielding, in particular to a voice shielding box based on ultrasonic interference. Background Art

[0002] The risk of mobile phone eavesdropping and recording has always existed in our lives. In addition to using mobile phones to actively record, the risk of mobile phones being remotely controlled and enabled for eavesdropping cannot be ignored.

[0003] Ultrasonic shielding can be used to interfere with mobile phone microphones, preventing them from recording voice messages. Ultrasonic frequencies exceed 20kHz, making them inaudible to the human ear. However, due to the nonlinearity of microphones, these ultrasonic waves can be recorded and leak to lower frequencies, interfering with normal speech. Existing voice jammers are inconvenient to install and remove. Utility Model Content

[0004] The purpose of the present application is to provide a voice shielding box based on ultrasonic interference, which is used to prevent voice eavesdropping and is convenient for placing and removing electronic devices.

[0005] In order to achieve the above-mentioned objectives, the present application provides a voice shielding box based on ultrasonic interference, comprising a shell, a pull-out structure, and a plurality of ultrasonic probes. Along the length direction of the voice shielding box, the shell has two opposite sides, at least one of which has an opening. Along the length direction of the voice shielding box, the pull-out structure is slidably connected to the shell, and the pull-out structure is used to pull out or slide into the shell through the opening; the pull-out structure has a limiting groove, which is used to accommodate a part of the electronic device and limit the electronic device. The ultrasonic probe is arranged on the inner wall of the shell, and along the width direction of the voice shielding box, multiple ultrasonic probes are distributed on both sides of the pull-out structure, and the ultrasonic probe is used to emit ultrasonic waves into the limiting groove.

[0006] After the pull-out structure is pulled out of the housing, an electronic device (such as a mobile phone) requiring voice shielding against eavesdropping can be placed on the pull-out structure, which is then pushed back into the housing. Each ultrasonic probe emits ultrasonic waves toward the electronic device's location within the retaining slot. The ultrasonic waves cover the entire area where the electronic device is placed, achieving directional interference. Within the coverage area, they can generate noise pressure exceeding 100dB. By exploiting the nonlinearity of the electronic device's microphone, this interference causes the microphone to be overwhelmed by the noise, rendering the recorded audio impossible to recover. In other words, the noise pressure overwhelms the voice information, thereby preventing voice eavesdropping. To remove the electronic device, the pull-out structure is pulled out of the housing, and the device is then removed. Compared to existing technologies, the pull-out structure can be pulled out or slid into the housing, facilitating the insertion and removal of electronic devices. This is particularly true when the voice shielding box is located in an environment such as a cabinet, where there are more restrictions along its thickness. This pull-out mechanism facilitates the insertion and removal of electronic devices.

[0007] In some possible embodiments, the shell includes two metal inner compartments and an outer shell. Along the width direction of the voice shielding box, the two metal inner compartments are respectively arranged on both sides of the pull-out structure; the metal inner compartment has a groove, the opening of the groove faces the pull-out structure, and the ultrasonic probe is arranged on the bottom wall of the groove. The side wall of the groove is arc-shaped, and the area of ​​the opening of the groove is larger than the area of ​​the bottom wall of the groove; along the length direction of the voice shielding box, the pull-out structure is slidably connected to the shell; when the pull-out structure slides into the outer shell, the outer shell covers the metal inner compartment and the pull-out structure, and the metal inner compartment is fixedly connected to the outer shell.

[0008] In some possible implementations, the bottom wall of the groove has an opening, and the ultrasonic probe is fixedly disposed in the opening.

[0009] In some possible implementations, the upper surface of the housing has a transparent window, and the transparent window is made of transparent plastic.

[0010] In some possible implementations, the metal inner chamber is made of aluminum.

[0011] In some possible embodiments, the drawer structure includes a bracket, a door panel, and a handle. A retaining groove is defined in the bracket. The door panel is fixedly connected to the bracket, such that when the drawer structure slides into the housing, the door panel covers the opening. The handle is disposed on the exterior of the door panel and fixedly connected to the handle.

[0012] In some possible embodiments, the shell has two opposite sides along the length direction of the voice shielding box, each side having an opening; the voice shielding box includes two pull-out structures, the pull-out structures corresponding to the openings one by one, and the pull-out structures are pulled out of or slid into the shell through the corresponding openings respectively.

[0013] In some possible implementations, the drawer structure has at least two limiting slots, each of which is used to accommodate an electronic device.

[0014] In some possible implementations, a wireless charging device is provided below the limiting groove.

[0015] In some possible embodiments, the voice shielding box further includes a controller, a power amplifier, and a switch button. The controller and power amplifier are both located within the housing on a side of the metal inner compartment facing away from the pull-out structure. The controller is electrically connected to the ultrasound probe and the power amplifier. The switch button is disposed on the housing and is used to turn the voice shielding box on and off. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0017] Figure 1 A schematic structural diagram of a voice shielding box provided by an embodiment of the present utility model;

[0018] Figure 2 for Figure 1 The structure diagram of the voice shielding box shown is in the state where the pull-out structure is pulled out;

[0019] Figure 3 for Figure 1 The ultrasound probe arrangement diagram of the speech masking box is shown.

[0020] Reference numerals:

[0021] 1-shell; 11-opening; 12-metal inner compartment; 121-groove; 1211-bottom wall; 1212-side wall; 13-outer shell; 131-transparent window; 2-pull-out structure; 21-limiting groove; 22-bracket; 23-door panel; 24-handle; 3-ultrasound probe; 4-electronic device; 5-guide rail; 6-wireless charging device; 7-controller; 8-power amplifier; 9-switch button; 10-indicator light; 20-wire. DETAILED DESCRIPTION

[0022] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0023] It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0024] In addition, in the description of the present invention, "a plurality of" means two or more, unless otherwise clearly defined, and "a number of" means one or more, unless otherwise clearly defined.

[0025] In the description of the present invention, it should be understood that the terms "upper" and "lower" etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0026] In the description of this utility model, it should be noted that, unless otherwise specified or limited, the term "connection" should be understood in a broad sense. For example, it can mean a fixed connection, a detachable connection, or an integral connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean internal communication between two components or an interaction between two components. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0027] Ultrasonic shielding can be used to interfere with mobile phone microphones, preventing them from recording voice messages. Ultrasonic frequencies exceed 20kHz, making them inaudible to the human ear. However, due to the nonlinearity of microphones, these ultrasonic waves can be recorded and leak to lower frequencies, thereby interfering with normal speech. Existing voice jammers are mostly closed or fully open. Closed structures are inconvenient to insert and remove, while fully open structures cannot achieve directional interference shielding.

[0028] In order to solve the above problems, Figure 1 as well as Figure 2 As shown, an embodiment of the present invention provides a voice shielding box based on ultrasonic interference, comprising a housing 1, a pull-out structure 2, and a plurality of ultrasonic probes 3. Along the length direction of the voice shielding box, the housing 1 has two opposing sides, at least one of which has an opening 11. Along the length direction of the voice shielding box, the pull-out structure 2 is slidably connected to the housing 1, and the pull-out structure 2 is used to be pulled out of or slid into the housing 1 through the opening 11; the pull-out structure 2 has a limiting groove 21, which is used to accommodate a portion of an electronic device 4 and limit the electronic device 4 (for example, a mobile phone, tablet, or other electronic device with a recording function 4). For ease of description, as shown in FIG. Figure 1 The illustrated embodiment uses a mobile phone as an example. Ultrasonic probes 3 are disposed on the inner wall of housing 1 and are distributed along the width of the voice shielding box on both sides of the pull-out structure 2. Ultrasonic probes 3 are configured to emit ultrasonic waves toward the limiting slots 21.

[0029] During use of the ultrasonic interference-based voice shielding box provided in an embodiment of the present invention, the pull-out structure 2 is first pulled out of the housing 1, and the electronic device 4 (such as a mobile phone) that needs to be voice-shielded against eavesdropping is placed on the pull-out structure 2, and then the pull-out structure 2 is pushed into the housing 1. Each ultrasonic probe 3 emits ultrasonic waves toward the position of the electronic device 4 set on the limiting groove 21. The ultrasonic waves cover the entire area where the electronic device 4 is placed, achieving directional interference and generating a noise pressure exceeding 100dB within the coverage area. By utilizing the nonlinear principle of the microphone of the electronic device 4, interference is generated on the microphone, causing the audio recorded by the microphone to be covered by the noise and unable to be restored, that is, the noise pressure covers the voice information, thereby achieving the purpose of preventing voice eavesdropping. When the electronic device 4 needs to be taken out, the pull-out structure 2 is pulled out of the housing 1, and then the electronic device 4 is taken out.

[0030] Compared to existing technologies, the present invention provides a voice shielding box with a pull-out structure 2 that can be pulled out or slid into the housing 1, facilitating the insertion or removal of an electronic device 4. This is particularly true for voice shielding boxes with more restrictions along their thickness. For example, when the voice shielding box is located in a cabinet, the pull-out structure 2 facilitates the insertion or removal of the electronic device 4. When the pull-out structure 2 is pushed into the housing 1, the electronic device 4 is enclosed within the enclosed housing 1, and the ultrasonic probe 3 emits ultrasonic waves toward the location of the electronic device 4, achieving directional interference shielding.

[0031] For example, Figure 1 and Figure 3 As shown, four ultrasonic probes 3 are provided on either side of the pull-out structure 2. The ultrasonic probe 3 may be of model NU25C16T / R-1, with a probe diameter of 12 mm and a spacing of 50 mm between two adjacent probes. Of course, it should be noted that in other embodiments of the present application, the number of ultrasonic probes 3 may be other numbers (e.g., 2, 3, 4, 5, 6, 7, 9, 10, etc.), and the model and size may be other parameters. This is not specifically limited in the present embodiment.

[0032] The above embodiment Figure 1 as well as Figure 2 The figures shown in the figure are all illustrated by taking the number of the limiting grooves 21 as 4 as an example. In other embodiments of the present application, the number of the limiting grooves 21 may also be 2, 3, 6, 8, etc. The embodiments of the present application are not specifically limited.

[0033] In addition, if Figure 2 As shown, the voice shielding box further includes a guide rail 5 , and the drawer structure 2 is slidably connected to the guide rail 5 . The drawer structure 2 slides on the guide rail 5 , and then the drawer structure 2 is pulled out or pushed in.

[0034] As a possible way to achieve this, Figure 1 and Figure 2 As shown, the housing 1 includes two metal inner compartments 12 and an outer shell 13. For example, the metal inner compartments 12 can be made of iron or iron alloy, aluminum or aluminum alloy, lead or lead alloy, etc. Along the width direction of the voice shielding box, the two metal inner compartments 12 are respectively arranged on both sides of the pull-out structure 2; the metal inner compartment 12 has a groove 121, the opening of the groove 121 faces the pull-out structure 2, and the ultrasonic probe 3 is arranged on the bottom wall 1211 of the groove 121. The side wall 1212 of the groove 121 is arc-shaped, and the area of ​​the opening of the groove 121 is larger than the area of ​​the bottom wall 1211 of the groove 121. Along the length direction of the voice shielding box, the pull-out structure 2 is slidably connected to the housing 1; when the pull-out structure 2 slides into the outer shell 13, the outer shell 13 covers the metal inner compartment 12 and the pull-out structure 2, and the metal inner compartment 12 is fixedly connected to the outer shell 13.

[0035] Materials with good ultrasonic wave reflection properties are typically metals, particularly those with high acoustic impedance, such as iron or iron alloys (e.g., stainless steel), aluminum or aluminum alloys, lead or lead alloys, and so on. The metal inner chamber 12 exhibits excellent interfacial reflection properties for sound waves, reducing ultrasonic energy loss and enhancing shielding effectiveness. After the ultrasonic probe 3, located on the bottom wall 1211 of the groove 121, emits an ultrasonic wave, the wave effectively reflects off the sidewalls 1212 of the groove 121, forming an echo. The sidewalls 1212 of the groove 121 are curved, and the opening area of ​​the groove 121 is larger than the bottom wall 1211. This allows the ultrasonic wave emitted by the ultrasonic probe 3 to be directly transmitted to the electronic device 4. The ultrasonic wave reflected from the sidewalls 1212 of the groove 121 can also be transmitted to the electronic device 4. In other words, the groove 121 converges the emitted ultrasonic wave, resulting in a smaller divergence angle, enabling targeted interference with the electronic device 4. Furthermore, the outer shell 13 encloses the metal inner chamber 12 and the pull-out structure 2, and the metal inner chamber 12 is fixedly connected to the outer shell 13. With this arrangement, the outer shell 13 can protect the metal inner compartment 12 and the drawer structure 2 .

[0036] For example, the shell 13 can be made of plastic, such as PVC, PS plastic, etc. This configuration can reduce the weight of the shell 13 and reduce costs. In addition, the plastic is waterproof, moisture-proof, and wear-resistant, which can ensure the service life of the voice shielding box.

[0037] As a possible implementation method, the bottom wall 1211 of the groove 121 has an opening (located at Figure 1The ultrasonic probe 3 is fixedly positioned within the opening (excluding the area obscured by the ultrasonic probe 3). For example, the ultrasonic probe 3 can be secured to the opening using glue or a mechanical lock. This arrangement allows the wire 20 to pass through the opening from the outside of the metal inner compartment 12 and electrically connect to the ultrasonic probe 3.

[0038] In some embodiments, as Figure 1 and Figure 2 As shown, the upper surface of the housing 13 has a transparent window 131, and the material of the transparent window 131 is transparent plastic. In this way, the electronic device 4 in the voice shielding box can be observed through the transparent window 131.

[0039] In some embodiments, the metal inner chamber 12 is made of aluminum. Aluminum has high acoustic impedance (i.e., sound waves propagate slowly through it and require high energy). Aluminum also provides excellent surface reflection properties, allowing ultrasonic waves to effectively reflect off its surface and form echoes. Furthermore, aluminum has a low density, which can reduce the weight of the voice shielding box.

[0040] As a possible way to achieve this, Figure 1 and Figure 2 As shown, the pull-out structure 2 includes a bracket 22, a door panel 23 and a handle 24. A limiting groove 21 is provided on the bracket 22. The door panel 23 is fixedly connected to the bracket 22. When the pull-out structure 2 slides into the housing 1, the door panel 23 covers the opening 11. The handle 24 is provided on the outside of the door panel 23 and is fixedly connected to the handle 24. The pull-out structure 2 can be pulled out or pushed in by the handle 24, thereby completing the placement or removal of the electronic device 4. The door panel 23 can cover the opening 11, reducing the diffusion of ultrasonic waves out of the voice shielding box through the opening 11. In addition, there are no ultrasonic shielding components in the inner compartment of the voice shielding box, which will not block the propagation of ultrasonic waves and will not affect the shielding effect.

[0041] As a possible way to achieve this, Figure 1 and Figure 2 As shown, the voice shielding box has two opposing sides along its length, each with an opening 11. The voice shielding box includes two pull-out structures 2, each corresponding to the openings 11. The pull-out structures 2 can be pulled out of or slid into the housing 1 through their corresponding openings 11. This arrangement increases the number of electronic devices 4 that can be accommodated in the voice shielding box. Furthermore, the two pull-out structures 2 can be pulled out through the opposing openings 11, reducing the required sliding distance for each pull-out structure 2 and facilitating its removal or insertion.

[0042] In some embodiments, the drawer structure 2 has at least two limiting grooves 21, each limiting groove 21 is used to accommodate an electronic device 4. This arrangement can further increase the number of electronic devices 4 that can be accommodated in the voice shielding box.

[0043] As a possible implementation method, a wireless charging device 6 is provided below the limiting groove 21. The wireless charging device 6 is used to wirelessly charge the electronic device 4.

[0044] As a possible way to achieve this, Figure 1 As shown, the voice shielding box further includes a controller 7, a power amplifier 8 and a switch button 9. The controller 7 and the power amplifier 8 are both located on a side of a metal inner compartment 12 away from the pull-out structure 2 and are located in a housing 13 (the controller 7 and the power amplifier 8 are shown in FIG. Figure 1 As shown in the dotted part, the controller 7 and the power amplifier 8 are both blocked by the housing 13). The controller 7 is electrically connected to the ultrasonic probe 3 and the power amplifier 8. The switch button 9 is set on the housing 13, and the switch button 9 is used to turn on or off the voice shielding box. In order to effectively interfere with the electronic device 4, a series of ultrasonic signals of different frequencies can be used to enhance the interference. The signal can be generated by frequency sweeping. In the band of 24kHz to 26kHz, the frequency is swept with a step size of 1Hz and a time interval of 0.45ms. The frequency sweeping signal can be generated by the controller 7 (for example, the controller 7 can be an STM32F4 processor or an embedded processor of the same level), and after passing through the power amplifier 8 (for example, the power amplifier 8 can be an LM1875 power amplifier or a power amplifier of the same level), it can drive the ultrasonic probe 3 to generate ultrasonic waves of the corresponding frequency.

[0045] In some embodiments, the voice shielding box further includes an indicator light 10. The indicator light 10 is electrically connected to the controller 7 and is used to indicate the on / off state of the voice shielding box.

[0046] In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0047] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A voice shielding box based on ultrasonic interference, characterized in that: include: A shell having two opposite sides along the length direction of the voice shielding box, at least one of which has an opening; A pull-out structure is slidably connected to the housing along the length of the voice shielding box, and is used to be pulled out of or slid into the housing through the opening; the pull-out structure has a limiting groove, and the limiting groove is used to accommodate a portion of the electronic device and limit the electronic device; A plurality of ultrasonic probes are arranged on the inner wall of the shell and distributed on both sides of the pull-out structure along the width direction of the voice shielding box. The ultrasonic probes are used to emit ultrasonic waves to the limiting groove.

2. The voice shielding box based on ultrasonic interference according to claim 1, characterized in that: The housing comprises: Two metal inner compartments are respectively arranged on both sides of the pull-out structure along the width direction of the voice shielding box; the metal inner compartment has a groove, the opening of the groove faces the pull-out structure, the ultrasonic probe is arranged on the bottom wall of the groove, the side wall of the groove is arc-shaped, and the area of ​​the opening of the groove is larger than the area of ​​the bottom wall of the groove; The shell is slidingly connected to the pull-out structure along the length direction of the voice shielding box; when the pull-out structure slides into the shell, the shell covers the metal inner bin and the pull-out structure, and the metal inner bin is fixedly connected to the shell.

3. The voice shielding box based on ultrasonic interference according to claim 2, characterized in that: The bottom wall of the groove has an opening, and the ultrasonic probe is fixedly arranged in the opening.

4. The voice shielding box based on ultrasonic interference according to claim 2, characterized in that: The upper surface of the shell is provided with a transparent window, and the material of the transparent window is transparent plastic.

5. The voice shielding box based on ultrasonic interference according to claim 2, characterized in that: The material of the metal inner chamber is aluminum.

6. The voice shielding box based on ultrasonic interference according to claim 1, characterized in that: The pull-out structure includes: A bracket, wherein the limiting groove is provided on the bracket; a door panel fixedly connected to the bracket, and covering the opening when the drawer structure slides into the housing; A handle is arranged on the outside of the door panel and is fixedly connected to the handle.

7. The voice shielding box based on ultrasonic interference according to claim 1, characterized in that: Along the length direction of the voice shielding box, the shell has two opposite sides, each side having an opening; The voice shielding box includes two pull-out structures, each of which corresponds to the openings one by one, and the pull-out structures are pulled out of or slid into the housing through the corresponding openings respectively.

8. The voice shielding box based on ultrasonic interference according to any one of claims 1 to 7, characterized in that: The pulling structure has at least two limiting grooves, and each limiting groove is used to accommodate one electronic device.

9. The voice shielding box based on ultrasonic interference according to any one of claims 1 to 7, characterized in that: A wireless charging device is provided below the limiting groove.

10. The voice shielding box based on ultrasonic interference according to any one of claims 2 to 5, characterized in that: The voice shielding box also includes: Controller; A power amplifier, wherein the controller and the power amplifier are both located on a side of the metal inner compartment away from the pull-out structure and are located inside the housing, and the controller is electrically connected to the ultrasound probe and the power amplifier; A switch button is provided on the housing, and the switch button is used to turn on or off the voice shielding box.

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