CN114866182A - Directional hidden audio interference device and method - Google Patents
Directional hidden audio interference device and method Download PDFInfo
- Publication number
- CN114866182A CN114866182A CN202210469928.9A CN202210469928A CN114866182A CN 114866182 A CN114866182 A CN 114866182A CN 202210469928 A CN202210469928 A CN 202210469928A CN 114866182 A CN114866182 A CN 114866182A
- Authority
- CN
- China
- Prior art keywords
- interference
- signal
- ultrasonic
- module
- interference signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000003321 amplification Effects 0.000 claims abstract description 23
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 23
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims abstract description 18
- 238000004891 communication Methods 0.000 claims description 20
- 238000001228 spectrum Methods 0.000 claims description 15
- 238000001914 filtration Methods 0.000 claims description 6
- 230000008859 change Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 description 7
- 210000005069 ears Anatomy 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 239000010752 BS 2869 Class D Substances 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000001208 nuclear magnetic resonance pulse sequence Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K3/00—Jamming of communication; Counter-measures
- H04K3/80—Jamming or countermeasure characterized by its function
- H04K3/82—Jamming or countermeasure characterized by its function related to preventing surveillance, interception or detection
- H04K3/825—Jamming or countermeasure characterized by its function related to preventing surveillance, interception or detection by jamming
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Circuit For Audible Band Transducer (AREA)
Abstract
The invention discloses a directional hidden audio interference device and a method, wherein the device comprises an interference signal generation module, a signal amplification module, a matching circuit module and an ultrasonic array module; the interference signal generation module, the signal amplification module, the matching circuit module and the ultrasonic array module are sequentially connected; the interference signal generation module comprises a difference frequency control interference component and a wave beam direction control component, wherein the difference frequency control interference component is used for generating interference signals, the wave beam direction control component is used for modulating the interference signals, and the wave beam direction of the interference signals is changed by controlling the amplitude of the interference signals; the interference signal after amplitude modulation is input into a signal amplification module for signal amplification and then reaches an ultrasonic array module through a matching circuit module; the ultrasonic array module is used for converting the input interference signals into ultrasonic signals, controlling the form of final beams, outputting the ultrasonic interference signals and protecting the privacy and safety of users.
Description
Technical Field
The invention relates to a directional hidden audio interference device and a directional hidden audio interference method, in particular to a recording and wiretapping device based on parametric array hidden sound, and belongs to the technical field of privacy safety protection.
Background
In recent years, with the development of voice communication technology and the popularization of smart mobile devices, communication by voice has become an increasing choice. The use of voice for communication not only provides a great deal of convenience to individuals, but also stimulates the development of emerging multimedia services. However, the widespread use of voice communications has also raised many information disclosure issues and privacy security issues. In the life of people, it is not uncommon to steal information for voice communication. The most common way is interception of recorded voice, spyware on the PC side, keyloggers, and the advertiser records browsing information, and the simplest and most direct way is interception of the mobile phone recorded voice.
The current common anti-eavesdropping method for recording devices is as follows: the audio interference mode is used for playing some background noises to annihilate voice signals, obviously, the mode is very limited by environmental conditions and brings great interference and inconvenience to people; in the electromagnetic wave interference mode, signal interference is generated on digital equipment by emitting high-power electromagnetic waves so as to destroy the recording function of the digital equipment, but most of the existing digital recording equipment is provided with an anti-interference circuit, the circuit of the existing digital recording equipment is difficult to sense corresponding electromagnetic signals, and the interference distance is short, so that the effect is very limited.
Audio interference is also used more often as a simpler way of operation. Some anti-eavesdropping devices emit white noise to perform double interference on the recording equipment while eavesdropping by utilizing wireless signal interference. Such as the hidden sound barrier SB2400 of an existing anti-eavesdropping device abroad. For eavesdropping equipment such as a recording pen, white noise can be directly added into audio recorded by the recording equipment, so that the original recording is covered, and the interference effect is achieved. However, the white noise generated by this method is loud and can be easily heard by human ears in a relatively quiet environment, so that an eavesdropper can take countermeasures to prevent the interference device from breaking. This method has certain limitations.
For the prevention and control of wireless eavesdropping equipment, the related field adopts an electromagnetic wave interference method more. The wireless eavesdropping device mainly converts the recording into a wireless signal, transmits the wireless signal on a wireless signal frequency band, and restores the signal to realize the eavesdropping function. Electromagnetic wave interference signals can be transmitted on the working frequency band of the eavesdropping equipment by utilizing the electromagnetic wave interference, so that the recorded wireless signals cannot be normally transmitted, the transmission process of the signals is cut off, and the purpose of eavesdropping prevention is achieved. The electromagnetic wave interference means has better concealment, is not easy to be perceived by people and has obvious interference effect. But at the same time, it also has fatal defect, namely the interference distance is short, usually not more than 1m, at the same time, the cost of the equipment is expensive, it is not favorable to the large-scale popularization and use.
Disclosure of Invention
The technical problem is as follows: the invention aims to overcome the defects in the prior art, provides a realization method of a directional audio frequency interference concealment device, solves the problems of high background noise and damage to the quality of voice communication in the existing anti-eavesdropping scheme, and realizes the audio frequency interference concealment without damaging the normal voice communication of a user by using ultrasonic waves invisible to human ears. Aiming at the problems of short interference distance and poor interference effect in the existing anti-eavesdropping scheme, the directional strong interference wave beam is constructed by utilizing the directional hidden parametric acoustic array, so that the interference effect and the interference distance in a multi-recording scene are improved.
The technical scheme is as follows: the invention relates to a directional hidden audio interference device, which comprises an interference signal generation module, a signal amplification module, a matching circuit module and an ultrasonic array module; the interference signal generation module, the signal amplification module, the matching circuit module and the ultrasonic array module are sequentially connected;
the interference signal generation module comprises a difference frequency control interference component and a wave beam direction control component, the difference frequency control interference component is used for generating interference signals, the wave beam direction control component is used for modulating the interference signals, and the wave beam direction of the interference signals is changed by controlling the amplitude of the interference signals, so that the direction of the wave beam generated by the ultrasonic array module is controlled finally, and strong interference is applied to the target direction by utilizing the directivity of ultrasonic waves; the interference signal generation module is a core module of the invention and is used for generating and controlling interference signals;
the interference signal after amplitude modulation is input into a signal amplification module for signal amplification and then reaches an ultrasonic array module through a matching circuit module, the matching circuit module comprises an impedance matching component and a tuning matching component, and the impedance matching component is used for performing impedance matching on the amplified interference signal and adapting a signal source and a subsequent ultrasonic array module load; the tuning matching assembly is used for tuning the subsequent ultrasonic array module so as to enable the subsequent ultrasonic array module to resonate with the interference signal; the ultrasonic array module is used for converting the input interference signal into an ultrasonic signal, controlling the form of a final wave beam and outputting the ultrasonic interference signal.
Further, the interference signal generating module comprises a random noise generating component, a difference frequency signal modulating component and a signal filter; the random noise generation component, the difference frequency signal modulation component and the signal filter are sequentially connected;
the random noise generation component generates pseudo random numbers as noise signals in a pseudo random mode, the pseudo random numbers are used as original interference signals and input to the difference frequency signal modulation component, the difference frequency signal modulation component is used for spread spectrum modulation of the original interference signals and modulating the original interference signals to a communication frequency band needing interference, multi-band covering interference of a frequency band below 20KHz audible to human ears is achieved, the original interference signals are input to a signal filter for filtering, high-frequency components in the signals are filtered, only the interference signals of the interference frequency band are reserved, and the signal filter outputs the filtered interference signals to the signal amplification module.
Further, the signal amplification module includes a multi-stage power amplifier array, and the interference signal is input to the multi-stage power amplifier array for power amplification and then input to the matching circuit module.
Further, the ultrasonic array module comprises a transducer array component and a beam form control component; the transducer array comprises a plurality of ultrasonic transducers for converting the received interference signals from electrical signals to ultrasonic signals; the beam form control assembly is used for controlling the distance between the ultrasonic transducers so as to change the beam form generated by the ultrasonic array module; the ultrasonic array module is a final signal output module of the invention and is responsible for finally outputting a hidden sound interference signal for interfering eavesdropping equipment;
furthermore, the impedance matching assembly comprises a multi-stage transformer, and the transformer is correspondingly connected with the power amplifier; the tuning matching assembly comprises a plurality of stages of inductors, the inductors are correspondingly connected with the transformer, and the inductors are connected at two ends of the transducer in series to realize tuning matching.
Further, the beam shape control assembly includes an arrangement controller for controlling the arrangement manner and the arrangement distance of the ultrasonic transducers, thereby controlling the beam shape generated by the ultrasonic array module.
The invention relates to a directional hidden audio interference method, which comprises the following steps:
step 1, generating a corresponding difference frequency interference signal for a voice communication frequency band as an original interference signal;
and 2, performing spread spectrum modulation on the original interference signal, modulating the original interference signal to a communication frequency band needing interference, filtering high-frequency components in the signal, and only reserving the interference signal of the interference frequency band.
Step 3, carrying out amplitude modulation on the filtered interference signals, and changing the beam direction of the interference signals by changing the amplitude of the interference signals, thereby controlling the ultrasonic amplitude generated by each ultrasonic transducer in the subsequent ultrasonic array and changing the direction pointed by the beam;
step 4, amplifying the power of the interference signal after amplitude modulation;
step 5, performing impedance matching and tuning matching on the amplified interference signal so as to adapt to the subsequent load of the ultrasonic array module and tune;
and 6, converting the input interference signal into an ultrasonic signal by the ultrasonic array module, controlling the final beam form and outputting the ultrasonic interference signal. The ultrasonic array module comprises a transducer array module and a beam form control assembly; the transducer array module is used for converting an input interference signal into an ultrasonic signal and outputting the ultrasonic interference signal, and the beam form control assembly controls the form of an ultrasonic beam from a page by changing the distance between the transducers.
Has the advantages that: the directional hidden audio interference device is used for generating ultrasonic waves which are hidden by a user, have strong interference effect and long interference distance when the user carries out voice communication, so that the eavesdropping equipment of an attacker is interfered, and the privacy and the safety of the user are protected. The device and the method generate interference signals through difference frequency to interfere the monitoring of the eavesdropping device. And the hidden ultrasonic signal invisible to the normal voice communication of the user is generated, so that the quality of the normal voice of the user is ensured; meanwhile, the beam direction control and the beam form control are adopted, so that the generated ultrasonic interference signals can be pertinently directed to a specific direction to interfere the eavesdropping equipment, and the interference effect and the interference distance can be obviously improved by reasonably generating and controlling the direction and the form of the beam.
Drawings
FIG. 1 is a schematic view of the apparatus of the present invention.
FIG. 2 is a schematic view of the working process of the present invention.
Detailed Description
The key technology and modules of the present invention are described in detail below with reference to fig. 1.
The directional hidden audio interference device comprises an interference signal generation module, a signal amplification module, a matching circuit module and an ultrasonic array module which are sequentially connected; the interference signal generating module is used for generating a difference frequency interference signal, and the difference frequency interference signal reaches the matching circuit module after being subjected to power amplification by the signal amplifying module and finally reaches the ultrasonic array module.
The interference signal generation module is arranged near a voice communication protection object, for example, near a client who makes a call through a wireless network telephone, and the user performs interference protection on voice communication according to needs; the random noise generation component is used for generating a noise signal serving as an original interference signal, and the difference frequency signal modulation component is used for modulating the original interference signal to a target interference frequency band and then inputting the original interference signal to the signal filter for filtering to obtain an interference signal.
The random noise generation component adopts the pseudo-random number international generation standard ANSI X9.82 to generate a pseudo-random number as a noise signal, adopts a multiplication and congruence algorithm to generate a 256-bit random number, wherein 128bit is used as initial key, another 128bit is used as initial seed, random number generated by initial key and initial seed is used as spread spectrum modulation code, the spread spectrum modulation code is used to modulate a section of ordinary signal into pseudo-random noise signal with randomness and periodicity, in the invention, the ordinary signal can be a simple sinusoidal signal, for an eavesdropper who is disturbed, the noise generated by spread spectrum modulation is irremovable, without clearly regular white noise, however, the noise generated by the spread spectrum modulation is removable to the communicating party, so that the random noise generating component can utilize the noise to interfere with the eavesdropper without affecting the normal communication of the communicating party.
The difference frequency signal modulation component modulates the generated noise signal after spread spectrum modulation to a target interference frequency band, and in order to realize multi-band coverage interference to a frequency band below 20KHz audible to human ears, firstly, a broadband baseband signal needs to be generated and then modulated to a target high frequency to be sent out, and the technology for generating the broadband signal utilizes a spread spectrum modulation technology. The spread spectrum modulation module is positioned after channel coding and before high-frequency modulation; the physical form of the spread spectrum modulated signal is to de-fill the baseband pulse waveform of the channel coded output with a much narrower pulse sequence, with the result that the baseband spectrum is greatly broadened. The spread spectrum modulation code has the pseudo-randomness and the statistical property of a random signal, so that the spread spectrum modulation code is equivalent to noise for an eavesdropper, but is known and pseudo-random in the appearance of a receiver;
the signal filter is used for filtering high-frequency components in the signals, only the interference signals of the frequency band needing to be interfered are reserved, and difference frequency interference signals are output.
The directional hidden audio interference device comprises a signal amplification module, wherein the power amplification module is used for amplifying an interference signal finally generated by a generated interference signal generation module, and the amplified signal is transmitted to the ultrasonic array module through the matching circuit module. A power amplifier is a device that supplies a power signal to a load. Conventional power amplifiers are mostly in class AB and class D. The AB class power amplifier has high linearity but low efficiency, and does not meet the requirements of portable equipment; the class-D power amplifier has the advantages of small volume, light weight, high efficiency, large output power, small heat productivity, few peripheral devices and the like, the working efficiency can reach 90 percent, and the class-AB power amplifier is far high;
the matching circuit module comprises an impedance matching component and a tuning matching component; the impedance matching component is used for performing impedance matching on the amplified interference signal and adapting the amplified interference signal and a subsequent ultrasonic array module load; the tuning matching assembly is used for tuning the subsequent ultrasonic array module so as to enable the subsequent ultrasonic array module to resonate with the interference signal;
the impedance matching component adopts a transformer to change the active resistance of the transducer, so that the output resistance of the transducer is close to or equal to that of the power amplifier, the optimal power transmission matching is achieved, and the transducer obtains the maximum output power. Determination of transformation ratio 1: n is a radical of 2 ＝R 0 : r, wherein R 0 Is a power amplifier output resistor, and R is the equivalent load impedance of the rear transducer;
the tuning matching component adopts an additional reactive element to adjust the output reactance of a subsequent ultrasonic array module, so that the equivalent impedance input phase angle approaches zero, the reactive loss in power transmission is reduced, and the conversion efficiency is improved. In the invention, inductors are connected in series at two ends of the transducer to realize tuning matching;
the ultrasonic array module comprises an ultrasonic transducer array and a beam form control assembly. The ultrasonic transducer array is composed of a plurality of ultrasonic transducers and is used for converting the difference frequency interference signals from the electric signals into the ultrasonic signals; the beam form control assembly changes the form of the generated beam by controlling the distance between the transducers in the ultrasonic transducer array;
the ultrasonic transducer array component adopts a transducer array formed by piezoelectric ceramic ultrasonic transducers to transmit ultrasonic waves, and the transducer has the advantages of small volume, high concealment, flexible use, high sensitivity, reliable performance and low price, is ideal as an ultrasonic speaker and is used for converting interference signals from electric signals into ultrasonic signals;
the beam form control assembly can support the arrangement mode of the transducers of the circular piston array and the arrangement mode of the transducers of the planar annular array through a mechanically designed arrangement controller. In addition, the arrangement distance between the transducers can be adjusted through a mechanical knob; the beam form generated by the beam form control component is related to the wavelength lambda required to be generated and the arrangement distance d between the transducers; for circular piston array beam shape and ratio
Correlation, when the ratio of wavelength to piston radius
The smaller, the narrower the beam width; for the beam form of the planar annular array, the method is as follows
When the main lobe becomes small with the pitch, the beam width becomes large, but the side lobe becomes small when
When the beam width of the main lobe becomes narrow, a large side lobe appears.
The interference signal generation module also comprises a beam direction control assembly, and the beam direction control assembly is used for controlling the beam pointing direction of the interference signal so as to influence the pointing direction of the interference beam generated by the final ultrasonic array module; in order to ensure the high directivity of the wave beam, the form of the transducer array is analyzed, and the circular piston combined rectangular plane array is confirmed to have better directivity performance. However, the circular piston combined rectangular plane transmitting array has the defect of overhigh side lobe level by using the conventional method. In order to improve the directivity performance of the circular piston combined rectangular planar array, an amplitude array generating assembly is arranged in the interference signal generating module and used for carrying out amplitude modulation on the interference signal, and further controlling the amplitude of the interference signal generated by the transducer array assembly in the ultrasonic array module. For best results, the distance x between the transducer i and the center of the transducer array is determined i And the phase phi of the interference signal to be generated i Determining the ratio of the amplitude of the signal to the amplitude of the array elements as
Better directivity performance can be obtained.
The work flow of the method of the invention is shown in figure 2 and comprises the following steps:
step 1, a difference frequency control interference component in an interference signal generation module generates a corresponding difference frequency interference signal for a voice communication frequency band;
step 2, an interference signal generation module modulates the generated original interference signal and retains the interference signal through a filter to obtain an interference signal;
step 3, a beam direction control assembly in the interference signal generation module carries out amplitude modulation on the interference signal, controls the amplitude of ultrasonic waves generated by each ultrasonic transducer in a subsequent ultrasonic array by changing the amplitude, and changes the direction pointed by the beam;
step 4, the signal amplification module amplifies the interference signal generated by the interference signal generation module through power amplifiers of all levels;
step 5, the matching circuit module performs impedance matching and tuning matching on the amplified signal generated by the signal amplification module, and adapts to and tunes the subsequent ultrasonic array load;
step 6, the beam form control assembly in the ultrasonic array module changes the arrangement mode and the arrangement distance of each ultrasonic transducer through the arrangement controller, and generates a required beam form aiming at the possible position of the eavesdropping equipment needing to be interfered; the ultrasonic transducer array assembly in the ultrasonic array module finally emits the generated ultrasonic interference signal.
Claims (10)
1. A directional hidden audio interference device is characterized by comprising an interference signal generation module, a signal amplification module, a matching circuit module and an ultrasonic array module;
the interference signal generation module, the signal amplification module, the matching circuit module and the ultrasonic array module are sequentially connected; the interference signal generation module comprises a difference frequency control interference component and a wave beam direction control component, wherein the difference frequency control interference component is used for generating interference signals, the wave beam direction control component is used for modulating the interference signals, and the wave beam direction of the interference signals is changed by controlling the amplitude of the interference signals; the interference signal after amplitude modulation is input into a signal amplification module for signal amplification and then reaches an ultrasonic array module through a matching circuit module;
the ultrasonic array module is used for converting the input interference signal into an ultrasonic signal, controlling the form of a final wave beam and outputting the ultrasonic interference signal.
2. The directional hidden audio jamming device of claim 1, characterized in that the jamming signal generating module comprises a random noise generating component, a difference frequency signal modulating component and a signal filter; the random noise generation component, the difference frequency signal modulation component and the signal filter are sequentially connected;
the random noise generation component generates a noise signal in a pseudo-random mode, the noise signal is used as an original interference signal and input to the difference frequency signal modulation component, the difference frequency signal modulation component is used for carrying out spread spectrum modulation on the original interference signal, modulating the original interference signal to a communication frequency band needing interference, then inputting the communication frequency band to a signal filter for filtering, filtering a high-frequency component in the signal, and only retaining the interference signal of the interference frequency band.
3. The device of claim 1, wherein the signal amplification module comprises a multi-stage power amplifier array, and the interference signal is inputted to the multi-stage power amplifier array for power amplification and then outputted to the matching circuit module.
4. The directional covert audio frequency interference device of claim 1, wherein the matching circuit module comprises an impedance matching component and a tuning matching component, the impedance matching component is used for performing impedance matching on the amplified interference signal and adapting the signal source to a subsequent ultrasonic array module load; the tuning matching assembly is used for tuning the subsequent ultrasonic array module so as to enable the subsequent ultrasonic array module to resonate with the interference signal.
5. The directional covert audio disturbance device of claim 1, wherein said ultrasonic array module comprises a transducer array assembly and a beam pattern control assembly;
the transducer array comprises a plurality of ultrasonic transducers for converting the received interference signals from electrical signals to ultrasonic signals; the beam form control assembly is used for controlling the distance between the ultrasonic transducers so as to change the beam form generated by the ultrasonic array module; the transducer array outputs the resulting interference signal.
6. The directional hidden audio disturbance device according to claim 1, 4 or 5, wherein the impedance matching unit comprises a multi-stage transformer, the transformer is correspondingly connected with the power amplifier; the tuning matching assembly comprises a multi-stage inductor, and the inductor is correspondingly connected with the transformer.
7. The directional hidden audio disturbance device of claim 6, wherein an inductor is connected in series across the transducer to achieve tuning matching.
8. The directional muffling audio interference device of claim 5, wherein the beam pattern control module comprises an arrangement controller for controlling the arrangement and the arrangement distance of the ultrasonic transducers, so as to control the beam pattern generated by the ultrasonic array module.
9. A method for directionally concealing audio disturbances, comprising the steps of:
step 1, generating a corresponding difference frequency interference signal for a voice communication frequency band as an original interference signal;
step 2, spread spectrum modulation is carried out on the original interference signal, the original interference signal is modulated to a communication frequency band needing interference, high-frequency components in the signal are filtered, only the interference signal of the interference frequency band is reserved, and the filtered interference signal is obtained;
step 3, carrying out amplitude modulation on the filtered interference signal, and changing the wave beam direction of the interference signal by changing the amplitude of the interference signal;
step 4, amplifying the power of the interference signal after amplitude modulation;
step 5, performing impedance matching and tuning matching on the amplified interference signal so as to adapt to the subsequent load of the ultrasonic array module and tune;
and 6, converting the input interference signal into an ultrasonic signal by the ultrasonic array module, controlling the final beam form and outputting the ultrasonic interference signal.
10. The method of claim 9, wherein the ultrasonic array module comprises a transducer array module and a beam shape control assembly;
the transducer array module is used for converting the input interference signals into ultrasonic signals and outputting the ultrasonic interference signals, and the beam form control assembly controls the form of ultrasonic beams by changing the distance between the transducers.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210469928.9A CN114866182A (en) | 2022-04-28 | 2022-04-28 | Directional hidden audio interference device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210469928.9A CN114866182A (en) | 2022-04-28 | 2022-04-28 | Directional hidden audio interference device and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114866182A true CN114866182A (en) | 2022-08-05 |
Family
ID=82635820
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210469928.9A Withdrawn CN114866182A (en) | 2022-04-28 | 2022-04-28 | Directional hidden audio interference device and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114866182A (en) |
-
2022
- 2022-04-28 CN CN202210469928.9A patent/CN114866182A/en not_active Withdrawn
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Roy et al. | Backdoor: Making microphones hear inaudible sounds | |
| US10672416B2 (en) | Causing microphones to detect inaudible sounds and defense against inaudible attacks | |
| US11856366B2 (en) | Methods and apparatuses for driving audio and ultrasonic signals from the same transducer | |
| KR100633052B1 (en) | Apparatus for generating magnetic field for the hearing impaired in portable communication terminal | |
| JP3492701B2 (en) | Hearing aid with wireless remote processor | |
| US11581918B2 (en) | Near field communications system having enhanced security | |
| US20110129101A1 (en) | Directional Microphone | |
| WO2006086743A2 (en) | In-band parametric sound generation system | |
| US20050286346A1 (en) | High intensity directional electroacoustic sound generating system for communications targeting | |
| CN114337850A (en) | Anti-eavesdropping method and system based on ultrasonic wave injection technology | |
| CN105306162A (en) | Mixing-based recording shielding device and realizing method thereof | |
| CN115549846A (en) | Novel recording and eavesdropping prevention method and system | |
| CN108769868B (en) | Method and device for realizing mobile phone screen lower receiver based on frequency division ultrasonic parametric array | |
| KR100731816B1 (en) | Eavesdropping prevention method and apparatus using sound wave | |
| CN114866182A (en) | Directional hidden audio interference device and method | |
| CN105827357B (en) | A kind of recording shielding device and screen method of recording | |
| Chen et al. | Implement of a secure selective ultrasonic microphone jammer | |
| He et al. | Compromised computers meet voice assistants: Stealthily exfiltrating data as voice over telephony | |
| US6532292B1 (en) | Method and apparatus to transmit audio into the human ear | |
| CN1519059A (en) | Equipment and method for generating directional sound wave | |
| RU2103742C1 (en) | Guarding radio system which uses noise-like signals | |
| KR960006354A (en) | Combined wireless terminal with mobile phone / wireless phone | |
| RU2167497C2 (en) | Method for masking of acoustic communication lines | |
| CN111064543A (en) | Hidden interference signal generating device and method based on ultrasonic parametric array | |
| He et al. | Using Inaudible Audio and Voice Assistants to Transmit Sensitive Data over Telephony |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20220805 |