Non-sensitive anti-recording method and system

Abstract

The present invention provides a method and system for preventing recording without feeling, which includes: generating a random sequence that changes with time; using the ultrasonic signal as a carrier, loading the random sequence onto the carrier to generate a first interference signal; amplifying the first interference signal, and transmitting the first interference signal in a direction to interfere with a recording device, thereby preventing recording without feeling or eavesdropping. By generating the first interference signal, the sound of the recording device eavesdropping or recording is mixed with ultrasonic noise, so that the recording device cannot restore the audio; at the same time, through the ultrasonic interference mode, the sound frequency emitted by the frequency that cannot be perceived by the human ear does not cause any harm or influence to the human body, but causes great interference to the recording device, and the effect of preventing recording without feeling is achieved under the condition that the user cannot perceive it.

Description

Technical Field

[0001] The present invention relates to the technical field of anti-eavesdropping, and in particular to a non-sensing anti-recording method and system. Background Art

[0002] With the development of science and technology and the advent of the information age, various means of stealing and counter-stealing emerge in an endless stream, so information confidentiality technology, especially voice information confidentiality technology, has received more and more attention. However, the technology and products directly used for recording shielding equipment are very rare both at home and abroad, so it can be said to be a blind spot in current research. On the other hand, the current recording technology has shifted from the original tape recording to digital recording, and the recording quality of recording equipment (such as recorders, voice recorders, etc.) can also be set according to needs, and the recording time can be up to hundreds of hours. At the same time, there are many recording products on the market, such as MP3, MP4, mobile phones, recording watches, etc. While recording technology is developing rapidly, it is bound to bring serious risks to personal privacy.

[0003] However, the existing recording shielding products (interference blockers) on the market, especially the recording shielding products with white noise mode, cannot achieve the state of imperceptible recording prevention, that is, the user cannot achieve the purpose of preventing recording when the recording shielding product is working illegally. Summary of the invention

[0004] In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a method and system for preventing recording without any sense, so as to solve the problem that the anti-recording system in the prior art cannot prevent recording without any sense.

[0005] To achieve the above-mentioned purpose and other related purposes, the present invention provides a method for preventing recording without feeling, comprising:

[0006] Generate random sequences that vary over time;

[0007] Using the ultrasonic signal as a carrier, loading the random sequence onto the carrier to generate a first interference signal;

[0008] The first interference signal is amplified and transmitted directionally to interfere with the recording device, thereby realizing non-contact anti-recording or anti-eavesdropping.

[0009] In one embodiment of the present invention, it further includes:

[0010] Generate multiple time series that vary over time;

[0011] Loading the multiple time series to the carrier to generate a second interference signal;

[0012] The second interference signal is amplified and transmitted directionally, so that the first interference signal and the second interference signal form standing waves in the air, interfering with the recording device to achieve non-contact anti-recording or anti-eavesdropping.

[0013] In one embodiment of the present invention, a random sequence device is used to generate a random sequence that changes with time, wherein the frequency change formula of the random sequence device is as follows:

[0014] Fx=(rand(seed)*t+adc)%f Formula (1)

[0015] In formula (1), Fx is the frequency of the random sequence, rand is the random function, seed is the seed value, t is the timing time, adc is the sampling data, % is the modulo f, and f is the carrier frequency.

[0016] In one embodiment of the present invention, a time series device is used to generate multiple time series that change over time, wherein the frequency change formula of the time series device is as follows:

[0017] F=(t*f1) / f*Fx Formula (2)

[0018] In formula (2), F is the frequency that changes with time, t is the timing time, f1 is the counting frequency of the timing, f is the carrying frequency of the carrier, and Fx is the frequency of the random sequence.

[0019] In one embodiment of the present invention, the audio file of the recording device is decoded and restored using the time series device and / or the formula for the reverse change of the frequency of the time series device to obtain the original audio.

[0020] In one embodiment of the present invention, the first interference signal is transmitted by a first ultrasonic recording mask; or / and the second interference signal is transmitted by a second ultrasonic recording mask.

[0021] In one embodiment of the present invention, the ultrasonic recording shielding device is arranged in a multi-point distribution to achieve regional coverage and imperceptible anti-recording interference.

[0022] In an embodiment of the present invention, the method further includes: adjusting the interference power or interference area of ​​the interference signal according to the current location distance of the user.

[0023] In one embodiment of the present invention, the method further includes: using music to adjust the atmosphere of the recording scene and interfere with the user's perception.

[0024] Another object of the present invention is to provide a non-sensitive anti-recording system, comprising:

[0025] Random sequence equipment, used to generate random sequences that vary over time;

[0026] A first ultrasonic modulation module, configured to use the ultrasonic signal as a carrier and load the random sequence into the carrier to generate a first interference signal;

[0027] A first interference module is used to amplify the first interference signal and transmit the first interference signal in a directionally manner to interfere with the recording device to achieve non-inductive anti-recording or anti-eavesdropping; or

[0028] Random sequence equipment, used to generate random sequences that vary over time;

[0029] A first ultrasonic modulation module, configured to use the ultrasonic signal as a carrier and load the random sequence into the carrier to generate a first interference signal;

[0030] A first interference module is used to amplify the first interference signal and transmit the first interference signal in a directionally manner to interfere with the recording device, thereby realizing non-inductive anti-recording or anti-eavesdropping;

[0031] Time series equipment, used to generate multiple time series that change over time;

[0032] A second ultrasonic modulation module, used for loading the multiple time series into the carrier to generate a second interference signal;

[0033] The second interference module is used to amplify the second interference signal and transmit the second interference signal in a direction, so that the first interference signal and the second interference signal form a standing wave in the air, and interfere with the recording equipment to achieve non-contact anti-recording or anti-eavesdropping.

[0034] As described above, the non-sensitive anti-recording method and system of the present invention has the following beneficial effects:

[0035] By generating a first interference signal, the sound eavesdropped or recorded by the recording device is mixed with ultrasonic noise, so that the recording device cannot restore the audio. At the same time, through the ultrasonic interference mode, the sound frequency emitted by the frequency that cannot be perceived by the human ear does not cause any harm or impact to the human body, but it will cause great interference to the recording device, achieving the effect of imperceptible anti-recording under the condition that the user cannot perceive. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 Shown is a flow chart of a non-sensing anti-recording method provided by the present invention;

[0037] Figure 2 Shown is a flow chart of an optimized method for non-sensitive anti-recording provided by the present invention;

[0038] Figure 3 Shown is a schematic diagram of a non-sensing anti-recording method provided by the present invention;

[0039] Figure 4 Shown is a structural block diagram of a non-sensing anti-recording system provided by the present invention;

[0040] Figure 5 Shown is a topological structure diagram of a non-contact anti-recording system provided by the present invention. DETAILED DESCRIPTION

[0041] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0042] See also Figures 1 to 5 . It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings in this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0043] Technical term: Ultrasonic-based directional sound propagation technology is a new sound source technology that can propagate sound in a certain direction in the form of a beam. Its basic principle is to modulate the audible sound signal onto the ultrasonic carrier signal and transmit it into the air by the ultrasonic transducer. During the propagation of ultrasonic waves of different frequencies in the air, due to the nonlinear acoustic effect of the air, these signals will interact and self-demodulate, thereby generating new sound waves with a frequency equal to the sum (sum frequency) and the difference (difference frequency) of the original ultrasonic frequencies. If the ultrasonic wave is selected appropriately, the difference frequency sound wave can fall into the audible sound area. In this way, with the help of the high directivity of the ultrasonic wave itself, the process of directional sound propagation is realized.

[0044] The human body perceives the outside world through the five major sensory systems of eyes, ears, nose, tongue and body, corresponding to the senses of vision, hearing, smell, taste and touch. Among them, "non-sense" refers to the ultrasonic interference mode. Ultrasonic waves are sound frequencies that are not perceived by the human ear. They do not cause any harm or impact to the human body, but they will cause great interference to recording equipment that relies on sound pickup. Specifically, before and after the non-sense anti-recording device is turned on, or when entering the coverage area of ​​the non-sense anti-recording from outside the area, the body cannot feel any perceptible changes in the surrounding environmental conditions. For example, including but not limited to: sound, light, pressure, temperature, etc., as well as all unknown physical discomfort.

[0045] See also Figure 1 , is a flow chart of a non-sensitive anti-recording method provided by the present invention, comprising:

[0046] Step S1, generating a random sequence that changes over time;

[0047] Wherein, a random sequence device is used to generate a random sequence that changes with time, wherein the frequency change formula of the random sequence device is as follows:

[0048] Fx=(rand(seed)*t+adc)%f Formula (1)

[0049] In formula (1), Fx is the frequency of the random sequence, rand is the random function, seed is the seed value, t is the timing time, adc is the sampling data, % is the modulo f, and f is the carrier frequency.

[0050] For example, a random sequence is a sequence of random variables. By controlling the frequency of the random sequence device over time, the random sequence of the output can be controlled.

[0051] Step S2, using the ultrasonic signal as a carrier, loading the random sequence into the carrier to generate a first interference signal;

[0052] Specifically, a random sequence is loaded onto the ultrasonic signal by using a modulator to form an encrypted first interference signal.

[0053] Step S3, amplifying the first interference signal, and directionally transmitting the first interference signal to interfere with the recording device, thereby achieving imperceptible anti-recording or anti-eavesdropping.

[0054] By amplifying the first interference signal, since the first interference signal is an ultrasonic signal, people cannot hear or perceive it. At the same time, the ultrasonic signal generates a standing wave in the air, causing interference to the recording equipment, thereby achieving an effect of imperceptible anti-recording.

[0055] See also Figure 2, which is a flowchart of an optimized method for non-sensitive anti-recording provided by the present invention, based on the above embodiment, further includes:

[0056] Step S4, generating a plurality of time series that vary with time;

[0057] Among them, a time series device is used to generate multiple time series that change with time, wherein the frequency change formula of the time series device is as follows:

[0058] F=(t*f1) / f*Fx Formula (2)

[0059] In formula (2), F is the frequency that changes with time, t is the timing time, f1 is the counting frequency of the timing, f is the carrying frequency of the carrier, and Fx is the frequency of the random sequence.

[0060] For example, a time series refers to a series of values ​​of the same statistical indicator arranged in the order of their occurrence. Multiple time series are generated by time series equipment, where the frequency of the time series is positively correlated with the frequency of the random sequence.

[0061] Step S5, loading the multiple time series into the carrier to generate a second interference signal;

[0062] Specifically, a modulator is used to load multiple time series onto the ultrasonic signal to form an encrypted second interference signal.

[0063] Step S6, amplifying the second interference signal and transmitting the second interference signal in a direction, so that the first interference signal and the second interference signal form a standing wave in the air, interfering with the recording device to achieve non-contact anti-recording or anti-eavesdropping.

[0064] Compared with the above embodiment, two ultrasonic devices are used to respectively realize ultrasonic interference, which greatly improves the effect of non-contact anti-recording.

[0065] In this embodiment, the random sequence device and the time series device are sent into the air through ultrasound to generate special standing waves (the first ultrasonic recording shield is used to transmit the first interference signal; the second ultrasonic recording shield is used to transmit the second interference signal). The standing waves will interfere with the recording device, causing the signal obtained by the recording device to become a superposition of the random sequence and the time series, thereby making it impossible to obtain sound normally. In addition, since the ultrasonic wave used is much larger than the human ear's hearing, and the frequency changes of the random sequence and the time series exceed the human ear's hearing perception of the sound wave difference, people cannot hear or feel the existence and working status of the interference device, thereby achieving non-sense anti-recording or anti-eavesdropping.

[0066] like Figure 3As shown, the jammer has two ultrasonic recording jammers at the same time, which respectively send a first jammer signal with a random sequence-ultrasonic wave and a second jammer signal with a time series-ultrasonic wave. The two ultrasonic recording jammers can be arranged in the same jammer, or a multi-point distribution setting can be adopted to achieve non-inductive anti-recording interference with regional coverage. Since the emission coverage range of each ultrasonic recording jammer is directional, the multi-point distribution setting greatly improves the regional coverage range, which is more conducive to achieving non-inductive anti-recording.

[0067] The ultrasonic carrying technology used, for example, uses multiple sets of equipment to form various spatial modes such as concentration, intersection, partition or full area coverage, so as to achieve the anti-recording effect for areas with different shapes or requirements; for example, multiple sets of equipment can be flexibly combined and placed in the best position for recording interference, forming a variety of non-contact anti-recording configuration modes such as superposition reinforcement mode, full space coverage mode, fixed-point interference mode, etc. The methods are flexible and changeable, and can adapt to specific areas of indoor environments of different shapes and some open environments.

[0068] For another example, the ultrasonic recording jammer can be used in standard offices, conference rooms and other indoor spaces, so that the target area in the space can achieve no blind spots and no sense of recording. In addition, it also includes vehicle spaces such as in-car scenes, aircraft scenes, and ship scenes. For example, it can be installed through the installation of external no sense of recording equipment in the automotive aftermarket to achieve no blind spots and no sense of recording in the interior space of the car. Compared with the manual detection and removal of recording equipment, it has the advantages of simple operation, convenience and speed.

[0069] In other embodiments, the audio file of the recording device is decoded and restored using the time series device and / or the formula for the reverse change of the frequency of the time series device to obtain the original audio.

[0070] For example, the formula of frequency reverse change, that is, the reverse decryption algorithm using the changing timing, can achieve the simultaneous satisfaction of the dual needs of recording and anti-recording in the same area.

[0071] In some other embodiments, it further includes: adjusting the interference power or interference area of ​​the interference signal according to the current location distance of the user.

[0072] For example, increasing or reducing the interference signal according to the coverage area of ​​the interference device where the user is located can help to perfectly realize the seamless anti-recording. At the same time, adjusting the interference signal coverage range of the interference device can also accurately achieve seamless anti-recording.

[0073] For another example, by sensing the distance of the user's position, different control signals are adjusted according to preset data, for example, the control signal size is dynamically adjusted in a step-by-step manner or according to a positively correlated slope or curvature. For example, a control signal with a power of a first preset value is sent within 3 meters to control the ultrasonic recording jammer, and a control signal with a power of a second preset value is sent within 6 meters to control the ultrasonic recording jammer. The working power of the ultrasonic recording jammer is dynamically adjusted according to the distance to form different control signals, and interference signals of different powers are generated according to the control signal to achieve non-inductive anti-recording.

[0074] In this embodiment, by automatically sensing the target distance and combining the comprehensive use of multi-band ultrasonic and optoelectronic technologies, more obvious intelligent differentiated interference in the far and near fields can be formed, especially at long distances, with more obvious advantages, weaker subjective feelings, and better non-detectable anti-recording effects.

[0075] In other embodiments, it also includes: using music to adjust the atmosphere of the recording scene and interfere with the user's perception.

[0076] Specifically, by playing light music, on the one hand, it can adjust the atmosphere of the recording scene, and on the other hand, it can confuse the user's perception through music, and the effect of imperceptible anti-recording is better.

[0077] See also Figure 4 , which is a structural block diagram of a non-sensing anti-recording system provided by the present invention, comprising:

[0078] A random sequence device 1, for generating a random sequence that changes over time;

[0079] A first ultrasonic modulation module 2, used for taking the ultrasonic signal as a carrier and loading the random sequence into the carrier to generate a first interference signal;

[0080] A first interference module 3 is used to amplify the first interference signal and transmit the first interference signal in a directionally manner to interfere with the recording device to achieve non-inductive anti-recording or anti-eavesdropping; or

[0081] A random sequence device 1, for generating a random sequence that changes over time;

[0082] A first ultrasonic modulation module 2, used for taking the ultrasonic signal as a carrier and loading the random sequence into the carrier to generate a first interference signal;

[0083] The first interference module 3 is used to amplify the first interference signal and transmit the first interference signal in a direction to interfere with the recording device, so as to achieve non-inductive anti-recording or anti-eavesdropping;

[0084] A time series device 4, for generating a plurality of time series that vary with time;

[0085] A second ultrasonic modulation module 5, configured to load the multiple time series into the carrier to generate a second interference signal;

[0086] The second interference module 6 is used to amplify the second interference signal and transmit the second interference signal in a direction, so that the first interference signal and the second interference signal form a standing wave in the air, and interfere with the recording equipment to achieve non-contact anti-recording or anti-eavesdropping.

[0087] In this embodiment, since the non-contact anti-recording system and the non-contact anti-recording method are in a one-to-one correspondence, their corresponding technical details and technical effects are the same and will not be described in detail.

[0088] Please refer to 5, which is a topological structure diagram of a non-sensitive anti-recording system provided by the present invention, which is described in detail as follows:

[0089] The sensor 11, whose output end is connected to the input end of the processing module, is used to obtain the distance of the current user's location;

[0090] Among them, the sensor can be a photoelectric sensing sensor, such as an infrared sensor, a distance sensor, etc., which detects the current position and distance of the user to facilitate subsequent precise interference;

[0091] The processing module 12 receives the trigger signal and generates a control signal acting on the ultrasonic recording mask (the first ultrasonic recording mask, or the first ultrasonic recording mask and the second ultrasonic recording mask), that is, the first control signal, or the first control signal and the second control signal.

[0092] The ultrasonic recording shielding device 13 has an input end connected to the output end of the processing module and is used to generate an interference signal according to the control signal to achieve non-inductive recording prevention.

[0093] For example, in a quiet environment of <40db, or in a noisy indoor or outdoor environment, the effect of imperceptible anti-recording can be achieved, that is, the anti-recording effect is independent of the sound pressure level of the ambient sound field.

[0094] Among them, the processing module can be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it can also be a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components.

[0095] Specifically, an interference signal is generated by using an ultrasonic recording jammer to interfere with the recording equipment so that the sound of eavesdropping and recording is mixed with ultrasonic noise, thereby achieving the purpose of preventing the recording equipment from restoring the audio. At the same time, through the ultrasonic interference mode, the sound frequency emitted by the frequency that is not perceived by the human ear does not cause any harm or impact to the human body, but it will cause great interference to the recording equipment, achieving the effect of imperceptible anti-recording under the condition that the user cannot perceive.

[0096] In this embodiment, in addition to being arranged in closed spaces such as indoors and in cars, the system can also be used either integrated or independently, forming a modular system that can be implanted in tables and chairs, bags, or portable audio equipment, making it convenient for mobile applications and highly concealed.

[0097] like Figure 5 As shown, the ultrasonic recording jammer 13 emits ultrasonic waves with encrypted sequences that are imperceptible to the human ear. When a digital device such as a mobile phone is recording, these sequence noises and the sound of normal conversation are recorded into the digital device together, making the recorded audio invalid. Since the encrypted sequence is randomly generated and cannot be restored, the audio after interference cannot be restored.

[0098] In this embodiment, compared with the audible interference mode of white noise, the ultrasonic interference mode is used. The sound produced during operation is small, there is no buzzing noise, there is no interference to the human body, and the harsh sound that can be heard by a few people is completely eliminated. It has a very obvious effect on recording equipment and mobile phone recording.

[0099] In some other implementations, the ultrasonic recording shield includes an ultrasonic generator, a sequence generator, a modulator, a power amplifier, and an ultrasonic transducer;

[0100] An ultrasonic generator, used for generating an ultrasonic signal;

[0101] The ultrasonic signal frequency is greater than 20KHZ, and this ultrasonic frequency should reach a frequency that is inaudible to the human ear.

[0102] The sequence generator includes, for example, a random sequence device 1 for generating a random sequence that varies with time; a time sequence device 4 for generating a plurality of time sequences that vary with time;

[0103] Among them, the frequency generated is a sequence signal of 4 to 7 khz or a lower frequency, for example, a frequency of 0.1 to 0.8 khz, such as 0.1 khz, 0.2 khz, 0.3 khz, 0.4 khz, 0.5 khz, 0.6 khz, 0.7 khz and 0.8 khz, etc., wherein the sequence signal is a random sequence signal, or the sequence signal is a random sequence signal and a time series signal.

[0104] A modulator, connected to the ultrasonic generator and the sequence generator respectively, for taking the ultrasonic signal as a carrier to modulate the sequence signal to generate an encrypted first interference signal, or a first interference signal and a second interference signal;

[0105] Wherein, the modulation mode of the modulator may be amplitude shift keying modulation, etc.;

[0106] A power amplifier, connected between the modulator and the ultrasonic array transmitter, for amplifying the interference signal (the first interference signal, or the first interference signal and the second interference signal);

[0107] The ultrasonic transducer is used to transmit the interference signal in a directionally manner to interfere with the recording or eavesdropping of the recording device.

[0108] Wherein, the frequency of the ultrasonic array transmitter is 20-30KHZ or higher, for example, a frequency of 20 to 100KHZ; such as 20KHZ, 30KHZ, 40KHZ, 50KHZ, 60KHZ, 70KHZ, 80KHZ, 90KHZ and 100KHZ, etc.

[0109] In this embodiment, if the upper frequency band of the receiver of the recorder is high and there is no good filter module, the interference signal emitted by the ultrasonic array transmitter will enter the audio channel of the eavesdropping device and interfere with the effective audio information, making it impossible to achieve the purpose of eavesdropping; if the recording device has a good filter module or the upper frequency band of the receiver is low, the modulated ultrasonic wave will be filtered out, but the interference signal modulated on the modulated ultrasonic wave will enter the audio channel of the eavesdropping device and will also interfere with the effective audio information, making it impossible to achieve the purpose of eavesdropping. At the same time, since the encrypted sequence signal is modulated on the ultrasonic frequency band, the human ear cannot hear the sound of the modulated ultrasonic wave, ensuring normal communication between users.

[0110] Wherein, the ultrasonic transducer is an ultrasonic array transmitter of piezoelectric film or piezoelectric ceramic.

[0111] For example, the human body's insensitivity effect cannot establish a proportional relationship with the ultrasonic frequency value, that is, the higher the frequency of the emitted ultrasonic wave, the better the human body's insensitivity effect. There is no direct and necessary logical relationship between the two. Relatively low ultrasonic waves can also achieve the human body's insensitivity effect after demodulation. This application can meet different scenarios and realize the miniaturization and home decoration of insensitivity anti-recording equipment. It further reflects the ultra-quiet and insensitivity, and the background music is better, making the application of insensitivity anti-recording more concealed.

[0112] Wherein, the modulator generates the interference signal by frequency conversion timing encryption.

[0113] For example, the interference technology of frequency conversion timing encryption, through digital encryption + frequency conversion + timing change, makes all recording devices, including various brands and models of mobile phones, professional voice recorders, professional eavesdropping monitoring equipment and stealth recording equipment, and miniaturized recorders, achieve the interference effect of being unable to hear or discern the semantics. At the same time, professional equipment uses the reverse decryption algorithm of changing timing to meet the dual needs of recording and anti-recording in the same area.

[0114] On the basis of the above embodiments, the ultrasonic recording shield can be specially designed as an independent system, or implanted in a supporting device or environment to form a clever disguise. This makes the relevant personnel in the target environment unaware that the conversation is being disturbed by the recording, and will not feel embarrassed or uncomfortable, nor worry about the content of the conversation being recorded by others. For example, the ultrasonic recording shield can be set in a spherical shell, the surface of the spherical shell is a hollow mesh, and the spherical shell is installed on a base, with hollow circular holes, mesh, etc., which is convenient for the transmission of interference signals; in addition, the spherical shell is a globe, because it is camouflaged through the surface of the globe, and the components that emit interference signals are installed inside, on the one hand, the appearance is beautiful and easy to carry or use, on the other hand, it can achieve the purpose of camouflage or decoration, and it is also convenient to transmit interference signals in all methods and angles, so that the interference signal covers the recording equipment to be shielded in all directions.

[0115] In other embodiments, a gain control circuit is provided between the ultrasonic generator and the modulator and / or between the sequence generator and the modulator, and the gain control circuit is used to ensure amplitude matching between the ultrasonic signal and the sequence signal to ensure normal modulation.

[0116] In other embodiments, a signal amplification circuit is arranged between the modulator and the ultrasonic transmitter to facilitate the subsequent ultrasonic array transmitter to transmit an interference signal (ultrasonic signal) with high power. At the same time, the power of the interference signal is increased to ensure the interference coverage area and intensity, thereby ensuring the best interference effect.

[0117] See also Figure 5 The non-contact anti-recording system also includes: a trigger module 14, whose output end is connected to the input end of the processing module, and is used to trigger a start-stop signal for opening or closing the ultrasonic recording shield.

[0118] The trigger module can be a trigger control of a button, remote control or other host computer, and the trigger control is realized through wired or wireless communication transmission. It is used to manage the non-contact anti-recording method and system to achieve the purpose of precise control and avoid inconvenient operation, inconvenient management, power consumption and the like.

[0119] Based on the above embodiment, the non-contact anti-recording system further includes:

[0120] The pan-tilt platform 16 is a support platform with an adjustable rotation angle, and is used to install the ultrasonic recording shield; the support platform is an electric pan-tilt platform that can rotate in all directions.

[0121] A camera 15, whose output end is connected to the input end of the processing module, is used to capture the screen image with the user;

[0122] The processing module has an output end connected to the pan / tilt control end and is used to adjust the rotation angle of the pan / tilt according to the screen image.

[0123] In this embodiment, since adjusting the rotation angle according to the position is a conventional technical means (existing technology) in the field of electric pan-tilt control, it will not be elaborated here. In addition, the user's current position can be accurately located by combining the screen image with the position distance, which is convenient for accurate interference prevention of recording without sense of directionality.

[0124] Based on the above embodiment, the processing module is further used to locate obstacles according to the screen image and the position distance to adjust the interference power and frequency of the ultrasonic recording jammer.

[0125] In this embodiment, through the precise positioning of multiple groups of ultrasonic devices, ultra-strong interference can be carried out in ultra-small areas according to the material texture of different obstructions, thereby improving the penetration of the equipment, including shielding and covering with down jackets, external wrappings, etc., to completely eliminate the possibility of recording.

[0126] In some other embodiments, see Figure 5 The non-contact anti-recording system also includes: a music player 17 connected to the processing module for adjusting the on-site atmosphere and capable of hiding interference.

[0127] Specifically, in conjunction with the music-carrying technology, that is, playing music when the ultrasonic recording jammer is working, it has good camouflage, can better conceal the purpose of recording interference, create a comfortable and relaxing physical space, create a good conversation atmosphere, and at the same time serve as a reminder of the boundaries of functional areas.

[0128] Based on the above, please refer to Figure 5 The non-contact anti-recording system also includes: a power supply module 18, which is connected to the components in the non-contact anti-recording method and the system to provide the power required for the ultrasonic recording shield, sensor, processor, camera, pan / tilt, music player and other components to work.

[0129] In summary, by generating the first interference signal, the sound eavesdropped or recorded by the recording device is mixed with ultrasonic noise, so that the recording device cannot restore the audio; at the same time, through the ultrasonic interference mode, the sound frequency emitted by the frequency that the human ear cannot perceive has no harm or impact on the human body, but it will cause great interference to the recording device, and the effect of non-sensing anti-recording is achieved under the condition that the user cannot perceive. Therefore, the present invention effectively overcomes various shortcomings in the prior art and has a high industrial utilization value.

[0130] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A non-sensitive anti-recording method, characterized in that: include: Generate random sequences that vary over time; Using an ultrasonic signal as a carrier, loading the random sequence onto the carrier to generate a first interference signal; amplifying the first interference signal, and transmitting the first interference signal directionally to interfere with the recording device; Generate multiple time series that vary over time; Loading the multiple time series to the carrier to generate a second interference signal, wherein the first interference signal and the second interference signal are generated by modulation in a variable frequency timing encryption manner; amplifying the second interference signal and transmitting the second interference signal in a direction, so that the first interference signal and the second interference signal form a standing wave in the air, interfering with the recording device to achieve non-inductive anti-recording or anti-eavesdropping; Among them, a random sequence device is used to generate a random sequence that changes with time. The frequency change formula of the random sequence device is as follows: Fx = (rand(seed) * t + adc)%f formula (1) In formula (1), Fx is the frequency of the random sequence, rand is the random function, seed is the seed value, t is the timing time, adc is the sampling data, % is the modulus of f, and f is the carrier frequency; A time series device is used to generate multiple time series that change over time. The frequency change formula of the time series device is as follows: F = (t * f1) / f * Fx Formula (2) In formula (2), F is the frequency that changes with time, t is the timing time, f1 is the counting frequency of the timing, f is the carrying frequency of the carrier, and Fx is the frequency of the random sequence.

2. The method for preventing recording without feeling according to claim 1, characterized in that: The method also includes: using the frequency change formula of the random sequence device and / or the time sequence device to decode and restore the audio file of the recording device to obtain the original audio.

3. The method for preventing recording without feeling according to claim 1, characterized in that: The first interference signal is transmitted by a first ultrasonic recording shield; and the second interference signal is transmitted by a second ultrasonic recording shield.

4. The method for preventing recording without feeling according to claim 3, characterized in that: The ultrasonic recording shielding device is arranged in a multi-point distribution to achieve non-inductive anti-recording interference in regional coverage.

5. The method for preventing recording without feeling according to claim 1, characterized in that: Also includes: The interference power or interference area of ​​the interference signal is adjusted according to the current location distance of the user.

6. The method for preventing recording without feeling according to claim 1, characterized in that: Also includes: Use music to adjust the atmosphere of the recording scene and interfere with the user's perception.

7. A non-sensitive anti-recording system, characterized in that: include: A random sequence device is used to generate a random sequence that changes over time. The frequency change formula of the random sequence device is as follows: Fx = (rand(seed) * t + adc)%f formula (1) In formula (1), Fx is the frequency of the random sequence, rand is the random function, seed is the seed value, t is the timing time, adc is the sampling data, % is the modulo f, and f is the carrier frequency; A first ultrasonic modulation module is used to use the ultrasonic signal as a carrier and load the random sequence into the carrier by adopting a variable frequency timing encryption modulation method to generate a first interference signal; A first interference module is used to amplify the first interference signal and transmit the first interference signal in a directionally manner to interfere with the recording device, thereby realizing non-inductive anti-recording or anti-eavesdropping; A time series device is used to generate multiple time series that change over time. The frequency change formula of the time series device is as follows: F = (t * f1) / f * Fx Formula (2) In formula (2), F is the frequency that changes with time, t is the timing time, f1 is the counting frequency of the timing, f is the carrier frequency, and Fx is the frequency of the random sequence; A second ultrasonic modulation module, which uses a variable frequency timing encryption modulation method to load the multiple time series into the carrier to generate a second interference signal; The second interference module is used to amplify the second interference signal and transmit the second interference signal in a direction, so that the first interference signal and the second interference signal form a standing wave in the air, and interfere with the recording equipment to achieve non-contact anti-recording or anti-eavesdropping.

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