Anti-eavesdropping device

Abstract

The utility model discloses an anti-eavesdropping device, which is arranged in a vehicle or in an office, the anti-eavesdropping device comprises an ultrasonic transducer array, the ultrasonic transducer array sends out single-frequency or mixed-frequency ultrasonic interference signals, and when the ultrasonic interference signals are single-frequency, the frequency of the ultrasonic interference signals is any one of the frequency bands of more than 25KHz or more than 40KHz; and when the ultrasonic interference signal is frequency mixing, the frequency of the ultrasonic interference signal is between 20 KHz and 25 KHz. According to the utility model, the ultrasonic signals are directly input to the ultrasonic transducer array, the conventional ultrasonic anti-eavesdropping principle is simplified, and single-frequency or mixed-frequency ultrasonic waves are adopted as interference signals for in-vehicle scenes or office scenes, so that the anti-eavesdropping effect and the comfort experience feeling of personnel are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to ultrasonic wave anti-interception technology field, concretely relates to a kind of anti-interception equipment suitable for in-car or office scene. BACKGROUND

[0002] Interception or interception refers to the means of obtaining effective audio information such as conversation or other sound in a hidden way using certain scientific and technological means. It will cause damage to the intercepted or intercepted party to some extent.

[0003] Most manufacturers currently use electromagnetic interference technology to prevent interception and interception, but electromagnetic interference will also cause other electronic devices to malfunction, so there are certain limitations in use.

[0004] Since ultrasonic waves cannot be heard by human ears, ultrasonic technology can be applied to the field of anti-interception and interception. There are currently devices that use ultrasonic waves to prevent interception and interception. The commonly used ultrasonic anti-interception equipment is generally based on piezoelectric ceramic ultrasonic transducer, which emits high-power ultrasonic signals, uses the nonlinear characteristics of the amplifier of the interception device to saturate it, so that the real sound signal cannot be recorded.

[0005] However, the existing ultrasonic interference signal generation principle applied to anti-interception is generally to obtain ultrasonic interference signals by modulating audible frequency band interference signals with ultrasonic carrier signals. Its signal generation principle is complex, and there are few existing ultrasonic anti-interception products for vehicle-mounted and office use, so it is necessary to provide an anti-interception device suitable for use in vehicles and offices. INVENTION CONTENTS

[0006] The utility model aims at providing an anti-interception device suitable for use in vehicles or office scenarios.

[0007] To achieve the above purpose, the utility model provides an anti-interception device, which is arranged in a vehicle or placed in an office. The anti-interception device includes an ultrasonic transducer array, which emits single-frequency or mixed-frequency ultrasonic interference signals. When the ultrasonic interference signals are single-frequency, their frequency is any one frequency in the frequency band above 25KHz or above 40KHz. When the ultrasonic interference signals are mixed-frequency, their frequency is between 20KHz and 25KHz.

[0008] In a preferred embodiment, the anti-interception device is arranged at multiple positions in the vehicle, and the ultrasonic interference signals emitted thereby cover at least the space below the chest of the person in the vehicle.

[0009] In a preferred embodiment, at least one anti-interception device is arranged on the left and right sides of each seat in the vehicle.

[0010] In a preferred embodiment, at least one of the left and right sides of each seat is provided with at least two anti-eavesdropping devices in the up-down direction, and / or at least one of the left and right sides of each seat is provided with at least two anti-eavesdropping devices in the front-back direction.

[0011] In a preferred embodiment, at least one anti-eavesdropping device is arranged on the door armrest and the armrest box of each seat on the left and right sides of each seat.

[0012] In a preferred embodiment, the anti-eavesdropping device comprises a functional plate and the ultrasonic transducer array mounted on one side of the functional plate, wherein the ultrasonic transducer array is arranged in the form of a linear array, a square array or a circular array, and the ultrasonic transducer is an electrostatic ultrasonic transducer or a piezoelectric ultrasonic transducer.

[0013] In a preferred embodiment, the anti-eavesdropping device is arranged on an office desk in an office.

[0014] In a preferred embodiment, the ultrasonic interference signals emitted by the anti-eavesdropping device and / or the ultrasonic interference signals reflected by the obstacles around the office desk cover at least the personnel in the office desk.

[0015] In a preferred embodiment, the anti-eavesdropping device comprises a support body, wherein the support body is a regular or irregular polyhedron or a sphere, and the polyhedron or the sphere is provided with the ultrasonic transducer array on at least a horizontal plane.

[0016] In a preferred embodiment, the distance between two adjacent ultrasonic transducers in the ultrasonic transducer array is 0.1-1 cm.

[0017] Compared with the prior art, the anti-eavesdropping device has the following beneficial effects:

[0018] The anti-eavesdropping device directly inputs ultrasonic signals to the ultrasonic transducer array, simplifies the principle of the existing ultrasonic anti-eavesdropping device, and uses single-frequency or mixed-frequency ultrasonic waves as interference signals for the in-vehicle scene or the office scene, thereby improving the anti-eavesdropping effect and the comfort experience of the personnel. BRIEF DESCRIPTION OF DRAWINGS

[0019] Fig. 1 FIG. 1 is a position schematic view of the anti-eavesdropping device of the present application embodiment 1 arranged on the left door armrest of the main driver in the vehicle;

[0020] Fig. 2 FIG. 2 is a position schematic view of the anti-eavesdropping device of the present application embodiment 1 arranged on the left door armrest and the right armrest box of the co-driver in the vehicle;

[0021] Fig. 3 Figure 2 is a schematic view of the setting position of the anti-eavesdropping device of the present application on an office table.

[0022] Reference signs are:

[0023] 1. Anti-eavesdropping device, 11. Function board, 12. Ultrasonic transducer array, 13. Support body. DETAILED DESCRIPTION

[0024] The specific embodiments of the present application will be described in detail below, but it should be understood that the protection scope of the present application is not limited by the specific embodiments.

[0025] Unless otherwise explicitly stated, throughout the specification and claims, the term "comprise" or its variants such as "comprises" or "comprising" will be understood to encompass the stated elements or components, without excluding the presence of other elements or components.

[0026] In combination Figs. 1-3 As shown in the accompanying drawings, the anti-eavesdropping device of the present application comprises an ultrasonic transducer array. During operation, a single-frequency or mixed-frequency ultrasonic interference signal is input to the ultrasonic transducer array, and the ultrasonic transducer array emits an ultrasonic interference signal that is not perceived by the human ear, so that the sound recorded by the eavesdropping or recording device is mixed with noise with ultrasonic noise, achieving the purpose of audio restoration by the recording device, i.e. achieving the effect of anti-eavesdropping.

[0027] In specific implementation, when the ultrasonic interference signal is single-frequency, its frequency can be any frequency in the frequency band above 25KHz or above 40KHz; when the ultrasonic interference signal is mixed-frequency, its frequency is preferably between 20KHz and 25KHz. When used in a vehicle, a single-frequency ultrasonic signal with a frequency of 40KHz is preferably used; when used in an office, a single-frequency ultrasonic signal with a frequency of 25KHz is preferably used, or a mixed-frequency signal between 20KHz and 25KHz.

[0028] The anti-eavesdropping principle of the above anti-eavesdropping device when used in a vehicle and in an office will be described below with two specific embodiments.

[0029] Embodiment 1

[0030] In combination Fig. 1 and Fig. 2 As shown in the accompanying drawings, the anti-eavesdropping device 1 disclosed in Embodiment 1 is applied to anti-eavesdropping in a vehicle. Specifically, by setting the anti-eavesdropping device at multiple positions in the vehicle according to the position of the personnel and the distribution of the seats in the vehicle, etc., the ultrasonic interference signal emitted by the anti-eavesdropping device 1 at each position covers at least the space below the chest of the personnel in the vehicle.

[0031] Specifically, in this embodiment 1, at least one anti-eavesdropping device 1 is installed on each of the left and right sides of each seat in the vehicle to cover the space below the chest of the occupants. Taking the driver's seat as an example, at least one anti-eavesdropping device 1 can be installed on the left door armrest and the right armrest of the driver's seat, with the sound-emitting surface of each anti-eavesdropping device 1 facing the passenger on the seat. In addition, in order to cover the area below the driver's chest, it is preferable to install at least two anti-eavesdropping devices 1 in the vertical direction of the left door armrest. One anti-eavesdropping device 1 is roughly level with the driver's chest, and the other anti-eavesdropping device 1 is approximately close to the driver's trouser pocket. This can prevent eavesdropping interference to recording devices located in the trouser pocket and below the chest. In addition, considering that recording devices such as mobile phones generally have two microphones, it is preferable to install at least two anti-eavesdropping devices 1 in the front-back direction on the left side of the driver's seat to cover the two microphones of the mobile phone. The scheme for installing anti-eavesdropping devices 1 on other seats is similar to that of the driver's seat and will not be described in detail here.

[0032] Furthermore, considering the unique environment inside a vehicle and the high level of comfort for the human ear, a single-frequency ultrasonic interference signal of 40kHz is preferred for use inside the vehicle. Tests show that with a 40kHz ultrasonic interference signal, the ultrasonic waves are more directional, the ultrasonic energy is more concentrated in one direction, and it is less noticeable to the human ear. Of course, single-frequency ultrasonic interference signals above 40kHz are also suitable for use inside a vehicle.

[0033] In this embodiment, each anti-eavesdropping device 1 includes a functional board 11 and an ultrasonic transducer array 12 mounted on one side of the functional board 11. In practice, the ultrasonic transducer array 12 is an array of multiple ultrasonic transducers arranged in at least a linear array, a square array, or a circular array. The ultrasonic transducers can be, but are not limited to, electrostatic or piezoelectric ultrasonic transducers. Furthermore, in practice, the spacing between two adjacent ultrasonic transducers in the ultrasonic transducer array 12 is preferably 0.1 cm to 1 cm.

[0034] Example 2

[0035] like Fig. 3 As shown in Embodiment 2, an anti-eavesdropping device is disclosed and applied to anti-eavesdropping in an office. Specifically, by placing the anti-eavesdropping device on a desk, the ultrasonic interference signal emitted by the anti-eavesdropping device 1 and / or the ultrasonic interference signal reflected by obstacles around the desk at least cover the person inside the desk.

[0036] Specifically, in this embodiment 2, the eavesdropping prevention device 1 specifically comprises a support body 13, which is at least a regular or irregular polyhedron or a sphere, and the ultrasonic transducer array is arranged on at least a face in a horizontal plane of the polyhedron or the sphere to cover a person in an office in a 360° direction of the horizontal plane. As in this embodiment, the support body 13 is a cuboid, and the ultrasonic transducer array 12 is arranged on each of the four end faces of the cuboid. As in the above embodiment 1, the ultrasonic transducer array 12 is an array formed by arranging a plurality of ultrasonic transducers in the form of a linear array, a square array or a circular array, and the ultrasonic transducers can be, but are not limited to, electrostatic or piezoelectric ultrasonic transducers. In addition, in implementation, the interval between two adjacent ultrasonic transducers of the ultrasonic transducer array 12 is preferably 0.1 cm to 1 cm.

[0037] In this embodiment, because the use scene is an office environment, the comfort experience requirement for human ears is lower than that in a car, so in the office environment, it is preferred to use an ultrasonic interference signal with a single frequency of 25 kHz or 40 kHz, or a mixed-frequency ultrasonic interference signal between 20 kHz and 25 kHz. Tests show that, in terms of eavesdropping prevention effect, the mixed-frequency ultrasonic interference signal between 20 kHz and 25 kHz has a better eavesdropping prevention effect than the 25 kHz single-frequency ultrasonic interference signal, and the eavesdropping prevention effect of the 25 kHz single-frequency ultrasonic interference signal is similar to that of the 40 kHz single-frequency ultrasonic interference signal. Of course, single-frequency ultrasonic interference signals above 25 kHz or 40 kHz are also applicable to the office environment.

[0038] The ultrasonic eavesdropping prevention device has the advantages that the ultrasonic signal is directly input to the ultrasonic transducer array, the principle of the existing ultrasonic eavesdropping prevention device is simplified, and for a car scene or an office scene, a single-frequency or mixed-frequency ultrasonic signal is used as an interference signal, so that the eavesdropping prevention effect and the comfort experience of a person are improved.

[0039] The foregoing description of specific exemplary embodiments of the present application is intended to be illustrative only and is not intended to limit the application to the precise forms described. Many modifications and variations are possible in light of the above teachings without departing from the spirit or essential characteristics of the present application. The exemplary embodiments were chosen and described in order to explain the principles of the present application and its practical application and to allow others skilled in the art to understand the present application for various exemplary embodiments with various modifications as are suited to the particular use contemplated. It is intended that the scope of the present application be defined by the claims and their equivalents.

Claims

1. An anti-eavesdropping device, characterized by comprising: The anti-eavesdropping device is arranged in a vehicle or in an office, and comprises an ultrasonic transducer array which emits single-frequency or mixed-frequency ultrasonic interference signals.

2. An anti-eavesdropping device as claimed in claim 1, characterized in that The anti-eavesdropping device is arranged at multiple positions in the vehicle, and the ultrasonic interference signals emitted thereby cover at least the space below the chest of a person in the vehicle.

3. An anti-eavesdropping device as claimed in claim 2, characterized in that At least one anti-eavesdropping device is arranged on each of the left and right sides of each seat in the vehicle.

4. An anti-eavesdropping device as claimed in claim 3, characterized in that At least one anti-eavesdropping device is arranged on each of the left and right sides of each seat in the vehicle.

5. An anti-eavesdropping device as claimed in claim 4, characterized in that At least one anti-eavesdropping device is arranged on each of the left and right sides of each seat in the vehicle.

6. A device for preventing eavesdropping according to any one of claims 1 to 5, wherein The anti-eavesdropping device comprises a functional plate and the ultrasonic transducer array arranged on one side of the functional plate.

7. The anti-eavesdropping device of claim 1, wherein The anti-eavesdropping device is arranged on a desk in an office.

8. An anti-eavesdropping device as claimed in claim 7, characterized in that The ultrasonic interference signals emitted by the anti-eavesdropping device and / or the ultrasonic interference signals reflected by obstacles around the desk cover at least a person on the desk.

9. A secure listening device as claimed in claim 7 or 8, characterized in that The anti-eavesdropping device comprises a support body which is at least a regular or irregular polyhedron or a sphere, and the polyhedron or sphere is provided with the ultrasonic transducer array on at least a face in a horizontal plane.

10. A device for preventing eavesdropping according to any one of claims 1 to 5, 7 and 8, wherein The distance between two adjacent ultrasonic transducers in the ultrasonic transducer array is 0.1-1 cm.

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