CN107483142A - A kind of directional jamming device based on marine environment - Google Patents
A kind of directional jamming device based on marine environment Download PDFInfo
- Publication number
- CN107483142A CN107483142A CN201710657654.5A CN201710657654A CN107483142A CN 107483142 A CN107483142 A CN 107483142A CN 201710657654 A CN201710657654 A CN 201710657654A CN 107483142 A CN107483142 A CN 107483142A
- Authority
- CN
- China
- Prior art keywords
- module
- masking
- signal
- device based
- marine environment
- 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.)
- Granted
Links
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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B11/00—Transmission systems employing sonic, ultrasonic or infrasonic waves
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B13/00—Transmission systems characterised by the medium used for transmission, not provided for in groups H04B3/00 - H04B11/00
- H04B13/02—Transmission systems in which the medium consists of the earth or a large mass of water thereon, e.g. earth telegraphy
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
Abstract
A kind of directional jamming device based on marine environment, is related to aeroacoustics, marine acoustics and signal transacting.Provided with underwater sound signal collection input module, modulate circuit, modulus sampler, signal processing module, masking interferance generator, power amplifier module, match circuit and ultrasonic array transducer；Underwater sound signal collection input module, modulate circuit, modulus sampler module, signal processing module are sequentially connected；The output end of signal processing module is sequentially connected with being connected at least two masking interferance generator, at least two masking interferance generator, power amplifier module, match circuit, ultrasonic array transducer simultaneously；Signal processing module is analyzed for the underwater sound signal collected, determine frequency range and the size of power spectrum, the result of signal processing module is exported to each masking interferance generator, masking interferance generator produces masking interference from different perspectives, form interference signal and sent by supersonic array transducer, realize interference anti-eavesdrop.
Description
Technical field
The present invention relates to aeroacoustics, marine acoustics and signal transacting, more particularly, to a kind of orientation based on marine environment
Countermeasure set.
Background technology
In recent years, with the rapid development of electronic technology, under water exploitation paces quickening, its subsurface communication with water it is thief-proof
Protection is listened to become more and more urgent.Information hiding and information protection under its underwater environment, due to the complexity of marine environment, its
Face very big challenge, the type that in general is eavesdropped under water also gradually realized with mode it is hidden, it is difficult to accomplish to eliminate and prevention.
The development of technology, on the one hand make it that people are easily preserved for the information of itself, the masses for being on the one hand
It is stealthy have at any time exposed danger, or even this serious privacy crisis is all suffered from secrecy department, procuratorial, judicial and public security organ, serious
While invading the right of privacy of people, also jeopardize nation's security.
Common underwater interception method mainly lays various underwater surveillance transmitting devices, while existing Marine Electronics produce
The function of its information technology of product is also gradually being popularized, its form and the mode used, including hidden means are also gradual
Renewal, it is difficult to reached by way of simply searching the person, make an inspection tour eradicate eavesdropping purpose, it is therefore desirable to propose it is more professional
Method and apparatus reaches the purpose of anti-eavesdrop.
For the implementation of anti-eavesdrop, certain methods are tried out, and have reached certain effect, such as mutual by typewriting
Pass, the mode such as paper slip mutually passes, the communication of electromagnetic interference shield, small yardstick is realized, but these modes all can with very it is big not
Just, it is unfavorable for the exchange of people and the purpose of information exchange, does not often reach the purpose of expected exchange.
Masking effect can cause discrimination of the auditory system to sound to be reduced with the ability perceived.Early stage, which has tested, to be shown,
When two voice signal time intervals are enough in short-term, two voice signals are recognized as a sound by subject, and can only be confirmed
The position of leading sound (forward sound on the time) and the position of hysteresis sound (sound on the time rearward) can not be confirmed, i.e., it is leading
Sound has pre-masking effect to hysteresis sound；Simultaneously hysteresis sound to leading sound perceptually there is also a certain degree of rear shelter effect.
Pre-masking effect and rear shelter effect are referred to as time domain masking, and the brain needs of people are primarily due to caused by time domain masking
Take some time and carry out processing information.Generally, it is considered that the pre-masking effect time is very short, only 5~20ms, and rear shelter effect
50~200ms can be continued.Research in underwater sound signal shows, the frequency f that human ear can be experienced scope for 20Hz~
20kHz, and be heterogeneous to frequency f resolution capability.When f is located in the range of 100~500Hz, cognizable two pure
The difference of the frequency of sound is 1.8Hz, and when f is located in the range of 500Hz~16kHz, relative frequency resolution ratio is almost constant, i.e.,
△ f/f=-3.5%.Thus, 20Hz~20kHz frequency range is divided into 620 frequency intervals by people.In general, frequency
The relatively low sound of rate easily shelters the higher sound of frequency, on the contrary then be relatively difficult to conceal and cover.Based on this, frequency f can be mapped to human ear
On perceived frequency yardstick, i.e., critical bandwidth corresponding to Bark yardsticks.Critical bandwidth, refer to the noise for being f with centre frequency to cover
When covering the pure tone that frequency is f, change the frequency band △ f of masking sound (noise), covered when can just hear masked sound (pure tone)
Cover the frequency band of sound.When the bandwidth of masking noise is less than critical bandwidth, with the increase of the bandwidth of noise, pure tone f can be sheltered
Intensity of sound be continuously increased, but after the bandwidth of masking noise reaches critical bandwidth, the bandwidth for continuing to increase noise cannot
Masking is improved again to measure.Therefore, according to the demand of current development, design and realize a kind of side for having and can preventing eavesdropping function
Method and device, have great importance.
The content of the invention
The eavesdropping problem invaded safely it is an object of the invention to solve current underwater information, there is provided borrow sound mask
Application in ocean, the anti-eavesdrop of subsurface communication is realized, reach a kind of orientation based on marine environment of protection information purpose and do
Disturb device.
The present invention is provided with underwater sound signal collection input module, modulate circuit, modulus sampler, signal processing module, masking
Interferance generator, power amplifier module, match circuit and ultrasonic array transducer；The underwater sound signal collection input module,
Modulate circuit, modulus sampler module, signal processing module are sequentially connected；The output end of signal processing module is with being connected to simultaneously
Few 2 masking interferance generators, at least two masking interferance generator, power amplifier module, match circuit, ultrasonic array change
Energy device is sequentially connected；The signal processing module is analyzed for the underwater sound signal collected, determines frequency range and power
The size of spectrum, the result of signal processing module are exported to each masking interferance generator, shelter interferance generator from difference
Angle produces masking interference, forms interference signal, and is sent interference signal by supersonic array transducer, realizes that interference is thief-proof
Listen.
The underwater sound signal collection input module can use transducer array input module, it is possible to achieve disturbed target water
The azimuthal orientation of acoustical signal；The signal processing module, masking interferance generator are all based on the digital platform realization of processor,
The processor may be selected from one kind in CPU, ARM, FPGA, DSP etc..The masking interferance generator, it can be believed according to numeral
The output of number processing module, the interference signal with masking effect is produced, by multiple masking interferance generators, produce to have and covers
Cover the interference signal of effect.
The quantity and angle of the masking interferance generator can be no less than 3, and particular number needs the region according to covering
To determine.
The underwater sound signal acquisition module, modulate circuit, modulus sampler module, power amplifier module, match circuit can
Realized by the way of analog circuit.
The underwater sound signal acquisition module is needed according to the characteristics of underwater sound signal, designs transducer array, can be linear array,
Circle battle array, L battle arrays or the transducer array that azimuthal orientation can be realized.
The modulate circuit can be provided with the cascade filtering module of small-signal amplification and periphery.
When the signal of the power amplifier module is enlarged into small-signal, can according to the size of the underwater sound signal of collection,
On the one hand it is conveyed to signal processing module and realizes positioning, determine the orientation of target, on the one hand determines that signal spectrum scope, energy are big
The parameter such as small.The power amplifier module is included using A classes mode, B classes mode, AB classes mode, D class mode power amplifiers, and it is realized
Can be analog device or corresponding chip device.
The power amplifier module is used to realize power amplification for the interference signal of caused masking effect, matches simultaneously
The impedance matching of circuit realiration and transducer array.
The ultrasonic array transducer can use piezoelectric ceramic piece, be bonded by cutting, glue, sintering forms more array elements
Integral ultrasonic array, it is possible to achieve the sonic transmissions function of parametric array.
The ultrasonic array transducer can be horn-like or cylindric, can also design different integrations according to demand
Ultrasonic parameter array module；The ultrasonic array transducer is provided with the input interface of transducer array, realizes the side in disturbed source
To positioning.
The beneficial effects of the invention are as follows：The present invention prevents the underwater sound signal of eavesdropping to be acquired needs, and passes through the underwater sound
Signal array orients and information processing, obtains its frequency spectrum parameter and power parameter, by sound mask method, designs its interference letter
Number, and interference signal is sent by transducer array module, form the interference anti-eavesdrop of underwater sound signal, the letter of its interference effect
It is single, it is easy to implement.
Brief description of the drawings
Fig. 1 is the underwater sound signal countermeasure set schematic diagram of the present invention；
Fig. 2 is the interferance generator schematic diagram for having in the present invention masking effect；
Fig. 3 is the supersonic array transducer structural representation of the present invention；
Fig. 4 is the underwater sound signal countermeasure set schematic diagram provided in the present invention.
Embodiment
Embodiments of the invention are described in further detail and illustrated below in conjunction with the accompanying drawings.
The underwater sound signal countermeasure set that the present embodiment provides is as shown in figure 1, provided with underwater sound signal collection input module 1, adjust
Manage circuit 2, modulus sampler 3, signal processing module 4, masking interferance generator 51~5N, 61~6N of power amplifier module,
With 81~8N of 71~7N of circuit and ultrasonic array transducer.The underwater sound signal collection input module 1, modulate circuit 2, modulus
Sampler 3, signal processing module 4 and its some additional devices are sequentially connected；The output of signal processing module 4 connects several cover simultaneously
51~5N of interferance generator is covered, 51~5N of each masking interferance generator, 61~6N of power amplifier module, match circuit 71~
7N, 81~8N of ultrasonic array transducer are sequentially connected；The signal processing module 4 divides for the underwater sound signal collected
Analysis, determines its frequency range and the size of power spectrum, and result is exported to each masking interferance generator, masking interference hair
Raw device produces masking interference from different perspectives, forms interference signal, and is sent interference signal by ultrasonic array transducer,
Realize interference anti-eavesdrop.
The signal processing module, masking interferance generator be all based on processor (can be cpu, ARM or FPGA,
DSP etc.) digital platform realize.
Wherein underwater sound signal acquisition module, modulate circuit, modulus sampler, power amplifier module, match circuit use mould
The mode for intending circuit is realized.
Wherein underwater sound signal collection input module includes the input interface of transducer array, realizes that direction positions.
Wherein modulate circuit includes the cascade filtering module of small-signal amplification and periphery.
Interferance generator with masking effect, requirement, realizes that generation can reach masking according to caused by masking effect
The interference signal of effect, it is assumed that pumping signal is：
y0(t)=P0sin[(ωat+ωb)t]sin(ω0t)
Wherein τ is pulse width, t ∈ [0, τ], ωa=2 π a, ωb=2 π b, ω0=2 π f0, a, b are constant, P0For excitation
Signal amplitude, f0Centered on frequency.
f0＞ ＞ (at+b), so y0(t) envelope function is：E (t)=sin [(ωat+ωb) t], E2(t)=sin2
[(ωat+ωb) t], it can obtain：
yd(t)=HI2cos[2(ωat+ωb)t+J2]
In formula：
Secondary wave signal caused by as former wave excitation signal.Secondary wave signal, which is analyzed, to be obtained, wherein J2Become
In zero, therefore the influence very little to signal.So it can be expressed as：yd(t)=HI2cos[2(ωat+ωb)t]
Therefore this signal is transmitted, the target location that can be disturbed, it is real according to the volume of parametric array from demodulation principle
The effect of the masking anti-eavesdrop of existing signal.
Wherein power amplifier module is included using A classes mode, B classes mode, AB classes mode, D class mode power amplifiers, and its realization can
Think analog device or corresponding chip device.
Integral type array ultrasonic of the supersonic array transducer module by built-in piezoelectric ceramic piece according to certain technique development
Wave transducer；
The type of the transducer is that, according to certain technological level, the array of the integrated form of realization surpasses using potsherd
Acoustic wave transducer；
The profile of the transducer array is horn shape, and wherein potsherd needs are cut into single independent according to technique
Array element, its shape need to be separated with glue without fixed mode between its array element, and realize integration by the technique such as sintering, solidifying
Shaping.
Main realization of the invention is for needing the occasion that anti-eavesdrop is protected to realize that anti-eavesdrop operates, its principle signal such as Fig. 4
It is shown, for needing signal to be protected to be gathered by acoustic array, pass through the underwater sound signal orientation algorithm such as TOA or DOA, realization pair
Oriented in by the underwater sound signal in protection direction, while calculate the watt level and bandwidth spectrum for needing to place eavesdropping underwater sound signal
Scope.By sheltering the signal of interferance generator sounding, interference signal is sent by supersonic array integration, realizes underwater sound signal
Thief-proof auditory function.
The present invention is intercepted and oriented to needing the underwater sound signal for putting eavesdropping to carry out array, by signal transacting, according to acquisition
It is as follows that parameter produces interference signal：
A kind of underwater sound signal anti-eavesdrop countermeasure set be provided with transducer array input module, modulate circuit, modulus sampler,
Signal processing module, masking interferance generator, power amplifier module, match circuit, ultrasonic array transducer.The underwater sound letter
Number collection input module, modulate circuit, modulus sampler module, signal processing module and its some additional devices are sequentially connected；
Signal processing module output simultaneously connects several masking interferance generators, each shelter interferance generator, power amplifier module,
It is sequentially connected with circuit, ultrasonic array module；The signal processing module is analyzed for the underwater sound signal collected, really
The size of its fixed frequency range and power spectrum, result is exported to each masking interferance generator, shelters interferance generator
Masking interference is produced from different perspectives, forms interference signal, and is sent interference signal by supersonic array transducer, is realized dry
Disturb anti-eavesdrop.If being used for underwater environment, underwater sound signal collecting device is asked to replace with corresponding underwater hydrophone array or water
Acoustic transducer array, realizes collection and the position detecting of acoustical signal, and remaining equipment is similar.
The interference type of the present invention can be Gaussian noise, mixed Gaussian noise, can be signal after the intertexture of original signal,
It can be the signal that frequency fogging interweaves, the signal to noise ratio of original signal reception can be destroyed so that the Quality Down of reception is bright
It is aobvious to decline.
Claims (10)
1. a kind of directional jamming device based on marine environment, it is characterised in that provided with underwater sound signal collection input module, conditioning
Circuit, modulus sampler, signal processing module, masking interferance generator, power amplifier module, match circuit and ultrasonic array
Transducer；The underwater sound signal collection input module, modulate circuit, modulus sampler module, signal processing module are sequentially connected；
The output end of signal processing module is with being connected at least two masking interferance generator, at least two masking interferance generator, work(simultaneously
Rate amplification module, match circuit, ultrasonic array transducer are sequentially connected；The signal processing module is for the underwater sound that collects
Signal is analyzed, and determines frequency range and the size of power spectrum, and the result of signal processing module is exported to each masking
Interferance generator, masking interferance generator produce masking interference, form interference signal, and change by supersonic array from different perspectives
Energy device sends interference signal, realizes interference anti-eavesdrop.
2. a kind of directional jamming device based on marine environment as claimed in claim 1, it is characterised in that the underwater sound signal is adopted
Collection input module uses transducer array input module, realizes the azimuthal orientation of disturbed target underwater sound signal；At the signal
Manage module and shelter digital platform of the interferance generator based on processor and realize that the processor is selected from CPU, ARM, FPGA, DSP
In one kind.
A kind of 3. directional jamming device based on marine environment as claimed in claim 1, it is characterised in that the masking interference hair
The quantity and angle of raw device are no less than 3.
4. a kind of directional jamming device based on marine environment as claimed in claim 1, it is characterised in that the underwater sound signal is adopted
Collection module, modulate circuit, modulus sampler module, power amplifier module, match circuit are realized by the way of analog circuit.
5. a kind of directional jamming device based on marine environment as claimed in claim 1, it is characterised in that the underwater sound signal is adopted
Integrate module as linear array, circle battle array, L battle arrays or the transducer array that azimuthal orientation can be realized.
6. a kind of directional jamming device based on marine environment as claimed in claim 1, it is characterised in that the modulate circuit is set
There is the cascade filtering module of small-signal amplification and periphery.
A kind of 7. directional jamming device based on marine environment as claimed in claim 1, it is characterised in that the power amplification mould
Block is included using A classes mode, B classes mode, AB classes mode, D class mode power amplifiers, and it is embodied as analog device or corresponding chip
Formula device.
A kind of 8. directional jamming device based on marine environment as claimed in claim 1, it is characterised in that the ultrasonic array
Transducer uses piezoelectric ceramic piece.
A kind of 9. directional jamming device based on marine environment as claimed in claim 1, it is characterised in that the ultrasonic array
Transducer is horn-like, cylindric or integrative ultrasonic parameter array module.
A kind of 10. directional jamming device based on marine environment as claimed in claim 1, it is characterised in that the ultrasonic array
Transducer is provided with the input interface of transducer array, realizes the direction positioning in disturbed source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710657654.5A CN107483142B (en) | 2017-08-03 | 2017-08-03 | A kind of directional jamming device based on marine environment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710657654.5A CN107483142B (en) | 2017-08-03 | 2017-08-03 | A kind of directional jamming device based on marine environment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107483142A true CN107483142A (en) | 2017-12-15 |
| CN107483142B CN107483142B (en) | 2019-11-08 |
Family
ID=60597571
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710657654.5A Active CN107483142B (en) | 2017-08-03 | 2017-08-03 | A kind of directional jamming device based on marine environment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107483142B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109714127A (en) * | 2019-03-05 | 2019-05-03 | 自然资源部第一海洋研究所 | Marine acoustics equipment interference unit and interference method |
| CN113539225A (en) * | 2021-07-22 | 2021-10-22 | 北京电信易通信息技术股份有限公司 | On-vehicle anti-eavesdropping device based on strong acoustic transducer array |
| RU2812340C1 (en) * | 2023-04-17 | 2024-01-30 | Федеральное государственное автономное образовательное учреждение высшего образования "Санкт-Петербургский государственный университет аэрокосмического приборостроения" | Method for generating and processing signal embedded in masking interference |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080207113A1 (en) * | 2005-07-29 | 2008-08-28 | Thales | Noise-Generating Device and Method |
| CN103098123A (en) * | 2010-09-08 | 2013-05-08 | 雅马哈株式会社 | Sound masking device and sound masking method |
| CN103969638A (en) * | 2013-02-04 | 2014-08-06 | 中国科学院声学研究所 | Underwater sound monitoring and jamming device |
| CN104036771A (en) * | 2013-03-07 | 2014-09-10 | 索尼公司 | Signal processing device, signal processing method, and storage medium |
| CN104601273A (en) * | 2015-01-26 | 2015-05-06 | 电子科技大学 | Voice signal interference device |
| CN104601784A (en) * | 2015-01-26 | 2015-05-06 | 电子科技大学 | Anti-eavesdropping device |
| CN105871475A (en) * | 2016-05-25 | 2016-08-17 | 哈尔滨工程大学 | Whale-sound-imitating covert underwater sound communication method based on self-adaptive interference cancellation |
| CN106656404A (en) * | 2016-04-01 | 2017-05-10 | 郭燕 | Secure secret communication method and device for time division duplex system |
-
2017
- 2017-08-03 CN CN201710657654.5A patent/CN107483142B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080207113A1 (en) * | 2005-07-29 | 2008-08-28 | Thales | Noise-Generating Device and Method |
| CN103098123A (en) * | 2010-09-08 | 2013-05-08 | 雅马哈株式会社 | Sound masking device and sound masking method |
| CN103969638A (en) * | 2013-02-04 | 2014-08-06 | 中国科学院声学研究所 | Underwater sound monitoring and jamming device |
| CN104036771A (en) * | 2013-03-07 | 2014-09-10 | 索尼公司 | Signal processing device, signal processing method, and storage medium |
| CN104601273A (en) * | 2015-01-26 | 2015-05-06 | 电子科技大学 | Voice signal interference device |
| CN104601784A (en) * | 2015-01-26 | 2015-05-06 | 电子科技大学 | Anti-eavesdropping device |
| CN106656404A (en) * | 2016-04-01 | 2017-05-10 | 郭燕 | Secure secret communication method and device for time division duplex system |
| CN105871475A (en) * | 2016-05-25 | 2016-08-17 | 哈尔滨工程大学 | Whale-sound-imitating covert underwater sound communication method based on self-adaptive interference cancellation |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109714127A (en) * | 2019-03-05 | 2019-05-03 | 自然资源部第一海洋研究所 | Marine acoustics equipment interference unit and interference method |
| CN109714127B (en) * | 2019-03-05 | 2023-09-19 | 自然资源部第一海洋研究所 | Marine acoustic equipment jammer and interference method |
| CN113539225A (en) * | 2021-07-22 | 2021-10-22 | 北京电信易通信息技术股份有限公司 | On-vehicle anti-eavesdropping device based on strong acoustic transducer array |
| CN113539225B (en) * | 2021-07-22 | 2022-02-11 | 北京电信易通信息技术股份有限公司 | On-vehicle anti-eavesdropping device based on strong acoustic transducer array |
| RU2812340C1 (en) * | 2023-04-17 | 2024-01-30 | Федеральное государственное автономное образовательное учреждение высшего образования "Санкт-Петербургский государственный университет аэрокосмического приборостроения" | Method for generating and processing signal embedded in masking interference |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107483142B (en) | 2019-11-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9113247B2 (en) | Device and method for direction dependent spatial noise reduction | |
| US6978159B2 (en) | Binaural signal processing using multiple acoustic sensors and digital filtering | |
| US20090122648A1 (en) | Acoustic mobility aid for the visually impaired | |
| US5289544A (en) | Method and apparatus for reducing background noise in communication systems and for enhancing binaural hearing systems for the hearing impaired | |
| JP3521914B2 (en) | Super directional microphone array | |
| US8090117B2 (en) | Microphone array and digital signal processing system | |
| US6798715B2 (en) | Biomimetic sonar system and method | |
| CN108122559B (en) | Binaural sound source positioning method based on deep learning in digital hearing aid | |
| US20070167812A1 (en) | Capacitive Micromachined Ultrasonic Transducer | |
| EP2211563B1 (en) | Method and apparatus for blind source separation improving interference estimation in binaural Wiener filtering | |
| US20040114772A1 (en) | Method and system for transmitting and/or receiving audio signals with a desired direction | |
| JP2009535655A (en) | Ambient noise reduction device | |
| Finneran et al. | Effects of multiple impulses from a seismic air gun on bottlenose dolphin hearing and behavior | |
| CN103907152A (en) | A method and a system for noise suppressing an audio signal | |
| CN107483142B (en) | A kind of directional jamming device based on marine environment | |
| Talagala et al. | Binaural sound source localization using the frequency diversity of the head-related transfer function | |
| Rasmussen et al. | Source levels and harmonic content of whistles in white-beaked dolphins (Lagenorhynchus albirostris) | |
| CN108597532A (en) | Hidden method for acoustic based on MVDR | |
| CN108337605A (en) | The hidden method for acoustic formed based on Difference Beam | |
| CN101447189A (en) | Voice interference method | |
| Guppy et al. | Acoustical aspects of hearing and echolocation in bats | |
| Hosangadi | A proposed method for acoustic source localization in search and rescue robot | |
| US20050085185A1 (en) | Method and apparatus for focusing sound | |
| Abdullah et al. | Detection of Human Echo Locator Waveform Using Gammatone Filter Processing | |
| Chen et al. | Head influence platform for cochlear implant |
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 | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |