Recording shielding system
By employing a specially arranged ultrasonic array module in the recording shielding system, covering the four directions of the Cartesian coordinate system, the problem of insufficient shielding angle and distance in the existing technology is solved, achieving a wider angle and greater range of recording shielding effect.
Patent Information
- Application Number
- CN202520168671.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-24
- Publication Date
- 2026-01-23
- Estimated Expiration
- 2035-01-24
AI Technical Summary
Existing ultrasonic recording shielding systems have shortcomings in shielding angle and distance, and their effectiveness is difficult to guarantee in complex environments.
The system employs a specially arranged ultrasonic array module, including central, horizontal, vertical, and oblique ultrasonic transmitter groups, covering the four directions of the Cartesian coordinate system to enhance the shielding effect.
It achieves wider-angle and larger-range recording shielding, suitable for various occasions, and enhances the privacy and flexibility of the recording environment.
Smart Images
Figure CN223829321U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of recording shielding technology, and in particular relates to a recording shielding system. Background Technology
[0002] The widespread use of recording devices makes illegal recording difficult to prevent, especially in places where privacy needs to be protected, such as conference rooms, negotiation rooms, and offices. Traditional recording jamming techniques mainly mask voice information by generating interference signals, but these methods often have problems such as limited jamming effectiveness, complex equipment, and poor portability.
[0003] In recent years, ultrasonic-based recording shielding technology has gradually attracted attention. Ultrasonic signals typically fall within the receiving range of recording equipment, effectively interfering with its normal operation. However, current ultrasonic shielding systems often employ simple ultrasonic probes or matrix arrangements, which tend to only effectively interfere with recording equipment in specific directions, while offering poor shielding against equipment in other directions. This results in limitations such as limited shielding angles, insufficient shielding distances, and difficulties in ensuring comprehensive shielding effectiveness in complex environments. Utility Model Content
[0004] The purpose of this invention is to address the problems existing in the prior art by providing a recording jamming system that can effectively expand the jamming range and improve the jamming effect.
[0005] To achieve the above objectives, the utility model employs the following technical solution: a recording shielding system, comprising a base, a vertical plate on the top side of the base, a microphone module, an analog-to-digital converter module, a processor module, and a power amplifier module sequentially arranged on the top of the base and on one side of the vertical plate, a Cartesian coordinate system marker line on the other side of the vertical plate, and an ultrasonic array module arranged on one side of the vertical plate with the Cartesian coordinate system marker line as a reference, the ultrasonic array module comprising a central ultrasonic transmitter group, a horizontal ultrasonic transmitter group, a vertical ultrasonic transmitter group, and an oblique ultrasonic transmitter group, the emission angles of the central ultrasonic transmitter group, the horizontal ultrasonic transmitter group, the vertical ultrasonic transmitter group, and the oblique ultrasonic transmitter group being different.
[0006] In the above technical solution, a specially arranged ultrasonic array module is used to replace the speaker of the traditional recording shielding system, which has a wider shielding angle, thereby effectively improving the overall shielding effect and making it suitable for a variety of occasions that require recording shielding.
[0007] Optionally, the center point of the central ultrasonic transmitter group coincides with the origin of the plane rectangular coordinate system, and the emission direction of the central ultrasonic transmitter group is perpendicular to the vertical plate.
[0008] Optionally, two sets of transverse ultrasonic transmitter heads are provided and distributed on the left and right sides of the central ultrasonic transmitter head set. The two sets of transverse ultrasonic transmitter heads face the positive and negative directions of the X-axis in the plane rectangular coordinate system, respectively. The angle between the emission direction of the transverse ultrasonic transmitter head set and the vertical plate is between 30° and 60°.
[0009] The above technical solution allows the horizontal ultrasonic transmitter group to cover the X-axis direction in the Cartesian coordinate system, which can enhance the sound shielding effect of the system in the left and right directions, making the shielding area more comprehensive.
[0010] Optionally, two sets of vertical ultrasonic transmitter heads are provided and distributed on the upper and lower sides of the central ultrasonic transmitter head set. The two sets of vertical ultrasonic transmitter heads face the positive and negative directions of the Y-axis in the plane rectangular coordinate system, respectively. The angle between the emission direction of the vertical ultrasonic transmitter head set and the vertical plate is between 30° and 60°.
[0011] The above technical solution allows the vertical ultrasonic transmitter group to cover the Y-axis direction. In conjunction with the horizontal ultrasonic transmitter group, it can achieve comprehensive sound shielding in four directions: up, down, left, and right, thereby expanding the shielding area and further enhancing the privacy of the recording environment.
[0012] Optionally, the oblique ultrasonic transmitter group includes at least four individual oblique ultrasonic transmitters. All oblique ultrasonic transmitters are evenly distributed on the angle bisectors of the four quadrants of the Cartesian coordinate system. Each oblique ultrasonic transmitter in each quadrant faces the extension direction of the angle bisector of its respective quadrant. The angle between the emission direction of the oblique ultrasonic transmitter and the vertical plate is between 20° and 80°.
[0013] The above technical solution, through the design of the oblique ultrasonic transmitter group, which is evenly distributed on the angle bisectors of the four quadrants of the plane rectangular coordinate system, can cover the four quadrants of the plane rectangular coordinate system, achieving comprehensive coverage and interference of sound signals in four directions, improving the system's comprehensiveness and flexibility, and enhancing the system's shielding effect.
[0014] Optionally, the microphone module is connected to the analog-to-digital converter module, the analog-to-digital converter module is connected to the processor module, the processor module is connected to the power amplifier module, and the power amplifier module is connected to the ultrasonic array module.
[0015] Optionally, the microphone module includes at least a microphone, a transistor, and a filter. The output of the microphone is connected to the input of the filter, and the output of the filter is connected to the transistor. The combination of the microphone, transistor, and filter effectively picks up and performs preliminary processing of sound signals, providing a reliable foundation for subsequent digital conversion and shielding operations.
[0016] Optionally, the analog-to-digital conversion module includes at least a pipelined analog-to-digital converter and a fully differential input / output high-voltage slew rate amplifier.
[0017] Compared with existing technologies, the beneficial effects of this utility model are as follows: 1. By using a specially arranged ultrasonic array module to replace the speaker of the traditional recording shielding system, the shielding angle is wider, thereby effectively improving the overall shielding effect and making it suitable for various occasions requiring recording shielding; 2. The arrangement of the ultrasonic transmitter group can cover the X-axis direction in the Cartesian coordinate system, which can enhance the sound shielding effect of the system in the left and right directions, making the shielding area more comprehensive; 3. The arrangement of the vertical ultrasonic transmitter group can cover the Y-axis direction, and in conjunction with the horizontal ultrasonic transmitter group, it can achieve comprehensive sound shielding in the four directions of up, down, left, and right, expanding the shielding area and further enhancing the privacy of the recording environment; 4. Through the design of the oblique ultrasonic transmitter group, by being evenly distributed on the angle bisectors of the four quadrants of the Cartesian coordinate system, it can cover the four quadrants of the Cartesian coordinate system, achieving comprehensive coverage and interference of sound signals in four directions, improving the comprehensiveness and flexibility of the system, and improving the shielding effect of the system. Attached Figure Description
[0018] Figure 1 A three-dimensional schematic diagram of the front view of the recording shielding system provided in this embodiment of the utility model;
[0019] Figure 2 A three-dimensional structural diagram of the recording shielding system provided in this embodiment of the present invention from the rear view.
[0020] Figure 3 This is a front view schematic diagram of the recording shielding system provided in an embodiment of the present utility model;
[0021] Figure 4 A system circuit block diagram provided for an embodiment of this utility model;
[0022] Figure 5 The microphone module circuit diagram provided for the embodiments of this utility model;
[0023] Figure 6 Circuit diagram of the analog-to-digital converter module provided in this embodiment of the utility model;
[0024] Figure 7The processor module circuit diagram provided for the embodiments of this utility model;
[0025] Figure 8 A power amplifier module circuit diagram provided for an embodiment of this utility model;
[0026] Figure 9 The circuit diagram of the ultrasonic array module provided in the embodiment of this utility model.
[0027] In the diagram: 1. Base; 2. Vertical plate; 3. Microphone module; 4. Analog-to-digital converter module; 5. Processor module; 6. Power amplifier module; 7. Cartesian coordinate system marker line; 8. Ultrasonic array module; 81. Central ultrasonic transmitter group; 82. Horizontal ultrasonic transmitter group; 83. Vertical ultrasonic transmitter group; 84. Oblique ultrasonic transmitter group. Detailed Implementation
[0028] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0029] In the description of this utility model, it should be noted that the terms "middle", "upper", "lower", "left", "right", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0030] like Figure 1 As shown in Figure 3, the specific scheme of the embodiment is as follows: A recording shielding system includes a base 1, a vertical plate 2 is provided on the side of the top of the base 1, a microphone module 3, an analog-to-digital converter module 4, a processor module 5 and a power amplifier module 6 are arranged sequentially on the top of the base 1 and on one side of the vertical plate 2, a plane rectangular coordinate system marker line 7 is provided on the other side of the vertical plate 2, and an ultrasonic array module 8 is arranged on one side of the vertical plate 2 with the plane rectangular coordinate system marker line 7 as the reference. The ultrasonic array module 8 includes a central ultrasonic transmitter group 81, a horizontal ultrasonic transmitter group 82, a vertical ultrasonic transmitter group 83 and an oblique ultrasonic transmitter group 84, and the emission angles of the central ultrasonic transmitter group 81, the horizontal ultrasonic transmitter group 82, the vertical ultrasonic transmitter group 83 and the oblique ultrasonic transmitter group 84 are different.
[0031] like Figure 4 As shown, the microphone module 3 is connected to the analog-to-digital converter module 4, the analog-to-digital converter module 4 is connected to the processor module 5, the processor module 5 is connected to the power amplifier module 6, and the power amplifier module 6 is connected to the ultrasonic array module 8.
[0032] In this embodiment, the microphone module 3 receives external audio signals. These audio signals are converted into electrical signals by the microphone and transmitted to the analog-to-digital converter module 4. The analog-to-digital converter module 4 converts the electrical signals into digital signals and transmits the data to the processor module 5. The processor module 5 uses an FFT algorithm to analyze the spectral characteristics of the audio signal and identify the signal type (speech or music). When a speech signal is detected, a corresponding PWM wave signal is generated, which drives the ultrasonic array module 8 through the power amplifier module. The power amplifier module 6 amplifies the PWM signal generated by the processor. By adjusting the duty cycle of the PWM wave, precise control of the output power is achieved. The ultrasonic array module 8 emits ultrasonic shielding signals through an optimized signal transmission path, interfering with the recording equipment and preventing audio signals from being recorded.
[0033] In this implementation, the ultrasonic transmitter deforms mechanically and generates ultrasonic waves when excited by an electrical signal. These waves are then transmitted through an optimized signal transmission path, emitting ultrasonic shielding signals that interfere with the recording equipment and prevent audio signals from being secretly recorded. The system's shielding distance is over 1 meter, and the shielding angle is greater than 60 degrees.
[0034] In this embodiment, a specially arranged ultrasonic array module 8 is used instead of the speaker of the traditional recording shielding system, which has a wider shielding angle, thereby effectively improving the overall shielding effect and making it suitable for various occasions that require recording shielding.
[0035] like Figure 3 , Figure 9 As shown, the center point of the central ultrasonic transmitter group 81 coincides with the origin of the plane rectangular coordinate system marker line 7, and the emission direction of the central ultrasonic transmitter group 81 is perpendicular to the vertical plate 2. In this embodiment, the central ultrasonic transmitter group 81 has four ultrasonic transmitters arranged in a 2*2 matrix.
[0036] Two sets of transverse ultrasonic transmitter heads 82 are provided and distributed on the left and right sides of the central ultrasonic transmitter head 81. The two sets of transverse ultrasonic transmitter heads 82 face the positive and negative X-axis directions of the plane rectangular coordinate system marking line 7, respectively. The angle between the emission direction of the transverse ultrasonic transmitter head 82 and the vertical plate 2 is between 30° and 60°.
[0037] Preferably, the angle between the emission direction of the transverse ultrasonic transmitter group 82 and the vertical plate 2 is 45°.
[0038] In this embodiment, by distributing the ultrasonic transmitters on the left and right sides of the central ultrasonic transmitter group 81 and determining their orientation and emission angle, the sound shielding effect of the system in the left and right directions can be enhanced, making the shielding area more comprehensive.
[0039] Two sets of vertical ultrasonic transmitter heads 83 are provided and distributed on the upper and lower sides of the central ultrasonic transmitter head 81. The two sets of vertical ultrasonic transmitter heads 82 are respectively oriented towards the positive and negative directions of the Y-axis in the plane rectangular coordinate system marking line 7. The angle between the emission direction of the vertical ultrasonic transmitter head 82 and the vertical plate 2 is between 30° and 60°.
[0040] Preferably, the angle between the emission direction of the vertical ultrasonic transmitter group 83 and the vertical plate 2 is 45°.
[0041] In this embodiment, the vertical ultrasonic transmitter group 83 can cover the Y-axis direction and cooperate with the horizontal ultrasonic transmitter group 82 to achieve comprehensive sound shielding in the four directions of up, down, left, and right, expanding the shielding area and further enhancing the privacy of the recording environment.
[0042] Preferably, the number of ultrasonic transmitters in both the horizontal ultrasonic transmitter group 82 and the vertical ultrasonic transmitter group 83 is set to 3, and they are distributed in a triangular pattern.
[0043] The oblique ultrasonic transmitter group 84 includes at least 4 individual oblique ultrasonic transmitters. All oblique ultrasonic transmitters are evenly distributed on the angle bisectors of the four quadrants of the plane rectangular coordinate system marker line 7. Each oblique ultrasonic transmitter in each quadrant faces the extension direction of the angle bisector of its respective quadrant. The angle between the emission direction of the oblique ultrasonic transmitter and the vertical plate 2 is between 20° and 80°.
[0044] Preferably, the angle between the emission direction of the oblique ultrasonic transmitter in each quadrant and the vertical plate 2 is 30°.
[0045] In this embodiment, by designing the oblique ultrasonic transmitter group 84, which is evenly distributed on the angle bisectors of the four quadrants of the plane rectangular coordinate system marker line 7, and by determining the orientation and transmission angle, comprehensive coverage and interference of sound signals in four directions are achieved, thereby improving the shielding effect of the system.
[0046] It should be noted that in real life, the orientation of the horizontal ultrasonic transmitter group 82, the vertical ultrasonic transmitter group 83, and the oblique ultrasonic transmitter group 84 in the ultrasonic array module 8 is not constant. In specific arrangements, the ultrasonic array module 8 can be arranged as a whole with offsets so that the orientation of the horizontal ultrasonic transmitter group 82, the vertical ultrasonic transmitter group 83, and the oblique ultrasonic transmitter group 84 is different from that in this embodiment.
[0047] Furthermore, the specific number and layout of the ultrasonic transmitters involved in the central ultrasonic transmitter group 81, the horizontal ultrasonic transmitter group 82, the vertical ultrasonic transmitter group 83, and the oblique ultrasonic transmitter group 84 can be expanded or reduced according to actual needs.
[0048] like Figure 5 As shown, the pickup module 3 includes at least a microphone, a transistor, and a filter. The microphone output is connected to the filter input, and the filter output is connected to the transistor. The pickup module 3 uses a microphone and a transistor. The audio signal is first converted into an electrical signal by the microphone, then passes through a filter composed of resistors and capacitors before being input to the transistor circuit, resulting in a corresponding analog voltage output. Unlike common sound sensor modules, this circuit does not use a biphase comparator to output a square wave; instead, it directly outputs the corresponding analog voltage to facilitate subsequent DFT (Digital Theory Function) differentiation of the audio signal type. The combination of the microphone, transistor, and filter effectively picks up and processes the sound signal, providing a reliable foundation for subsequent digital conversion and shielding operations.
[0049] like Figure 6 As shown, the analog-to-digital converter module 4 includes at least an ADS805 pipelined analog-to-digital converter and a THS4151 fully differential input / output high-voltage slew rate amplifier. It is used to convert the analog signal from the pickup module 3 into a digital signal. The THS4151 amplifies the weak analog signal output from the pickup module 3, increasing the signal amplitude to meet the input requirements of subsequent analog-to-digital conversion. Simultaneously, it converts the single-ended signal into a differential signal output, matching the differential input structure of the ADS805 and optimizing signal integrity. Differential amplification suppresses common-mode noise, improves the signal-to-noise ratio, and ensures the accuracy of the digitized signal. The ADS805 is a 20MHz, 12-bit high-speed analog-to-digital converter. The ADS805's high-speed sampling capability ensures signal integrity, providing a reliable data foundation for subsequent FFT analysis.
[0050] like Figure 7As shown, processor module 5 includes at least one high-speed FPGA (model EP4CE6F17C8N) for processing the digital signals converted by analog-to-digital converter module 4 (ADS805), providing a clock signal for ADS805, and controlling the operation of power amplifier module 6. The input of the FPGA is connected to the output of analog-to-digital converter module 4 to receive digital audio signals; its output controls the operation of power amplifier module 6 and provides a clock signal for analog-to-digital converter module 4. The FPGA internally runs a control program written in Verilog, which analyzes the spectral characteristics of the audio signal using an FFT algorithm to identify the signal type. When a voice signal is detected, a corresponding PWM wave signal is generated, which drives ultrasonic array module 8 through the power amplifier module. By adjusting the duty cycle of the PWM wave, precise control of the output power is achieved.
[0051] like Figure 8 As shown, power amplifier module 6 includes at least one Class D audio power amplifier, NS4110B. This chip is a 20W mono AB / D class switching audio power amplifier that supports differential input, ultra-low EMI, and requires no filter. The NS4110B can provide up to 18W of output power to a 4Ω load at a 12V operating voltage, and its efficiency of over 90% makes it ideal for portable audio systems. It is used to amplify the PWM signal generated by the processor.
[0052] The selection of these high-performance components enables the system to efficiently process sound signals and drive the ultrasonic array module 8 to emit powerful interference signals, thereby achieving effective shielding of the target sound.
[0053] It should be noted that the programs and algorithms involved in the processor in this embodiment are all mature programs and algorithms in the existing technology, so they will not be described here.
[0054] The working principle of the above embodiment is as follows: The microphone module 3 receives external audio signals through the microphone and converts them into electrical signals. These signals are then filtered to remove noise and amplified by a transistor to output an analog voltage signal. This analog voltage signal is transmitted to the analog-to-digital converter module 4, where it is amplified by the THS4151 and converted into a differential signal. The ADS805 then performs analog-to-digital conversion, converting the analog signal into a digital signal. The digital signal is transmitted to the processor module 5, where the internal FPGA analyzes the spectral characteristics of the audio signal using an FFT algorithm to identify the signal type. When a voice signal is detected, the FPGA generates a corresponding PWM wave signal, which is amplified by the NS4110B in the power amplifier module 6 to drive the ultrasonic array module 8. The ultrasonic array module 8 emits ultrasonic shielding signals according to an optimized signal transmission path, interfering with the recording equipment and preventing audio signals from being recorded, thus effectively shielding the target sound.
[0055] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A recording shielding system, comprising a base, a vertical plate provided on the top side of the base, and a microphone module, an analog-to-digital converter module, a processor module, and a power amplifier module sequentially arranged on the top of the base and on one side of the vertical plate, characterized in that: On the other side of the upright plate, there is a plane rectangular coordinate system marking line. On one side of the upright plate, with the plane rectangular coordinate system marking line as the reference, an ultrasonic array module is arranged. The ultrasonic array module includes a central ultrasonic transmitter group, a horizontal ultrasonic transmitter group, a vertical ultrasonic transmitter group, and an oblique ultrasonic transmitter group. The emission angles of the central ultrasonic transmitter group, the horizontal ultrasonic transmitter group, the vertical ultrasonic transmitter group, and the oblique ultrasonic transmitter group are different.
2. The recording shielding system according to claim 1, characterized in that: The center point of the central ultrasonic transmitter group coincides with the origin of the plane rectangular coordinate system, and the emission direction of the central ultrasonic transmitter group is perpendicular to the vertical plate.
3. The recording shielding system according to claim 1, characterized in that: Two sets of transverse ultrasonic transmitter heads are provided and distributed on the left and right sides of the central ultrasonic transmitter head set. The two sets of transverse ultrasonic transmitter heads face the positive and negative directions of the X-axis in the plane rectangular coordinate system, respectively. The angle between the emission direction of the transverse ultrasonic transmitter head set and the vertical plate is between 30° and 60°.
4. The recording shielding system according to claim 1, characterized in that: The vertical ultrasonic transmitter group is provided in two sets and distributed on the upper and lower sides of the central ultrasonic transmitter group. The two sets of vertical ultrasonic transmitter groups are respectively oriented towards the positive and negative directions of the Y-axis in the plane rectangular coordinate system. The angle between the emission direction of the vertical ultrasonic transmitter group and the vertical plate is between 30° and 60°.
5. The recording shielding system according to claim 1, characterized in that: The oblique ultrasonic transmitter group includes at least four individual oblique ultrasonic transmitters. All oblique ultrasonic transmitters are evenly distributed on the angle bisectors of the four quadrants of the Cartesian coordinate system. Each oblique ultrasonic transmitter in each quadrant faces the extension direction of the angle bisector of its respective quadrant. The angle between the emission direction of the oblique ultrasonic transmitter and the vertical plate is between 20° and 80°.
6. The recording shielding system according to claim 1, characterized in that: The microphone module is connected to the analog-to-digital converter module, the analog-to-digital converter module is connected to the processor module, the processor module is connected to the power amplifier module, and the power amplifier module is connected to the ultrasonic array module.
7. The recording shielding system according to claim 1, characterized in that: The pickup module includes at least a microphone, a transistor, and a filter. The output of the microphone is connected to the input of the filter, and the output of the filter is connected to the transistor.
8. The recording shielding system according to claim 1, characterized in that: The analog-to-digital conversion module includes at least one pipelined analog-to-digital converter and one fully differential input / output high-voltage slew rate amplifier.