CN108055087B - Communication method and device for coding by using number of long-limb piloting whale sound harmonics - Google Patents
Communication method and device for coding by using number of long-limb piloting whale sound harmonics Download PDFInfo
- Publication number
- CN108055087B CN108055087B CN201711489378.2A CN201711489378A CN108055087B CN 108055087 B CN108055087 B CN 108055087B CN 201711489378 A CN201711489378 A CN 201711489378A CN 108055087 B CN108055087 B CN 108055087B
- Authority
- CN
- China
- Prior art keywords
- communication
- sound
- time
- whale
- calls
- 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.)
- Active
Links
- 230000006854 communication Effects 0.000 title claims abstract description 119
- 241000283153 Cetacea Species 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims description 13
- 238000010586 diagram Methods 0.000 claims description 16
- 238000001228 spectrum Methods 0.000 claims description 13
- 241000283287 Globicephala melas Species 0.000 claims description 6
- 230000005236 sound signal Effects 0.000 claims description 2
- 230000001360 synchronised effect Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 claims 1
- 230000009466 transformation Effects 0.000 claims 1
- 238000001514 detection method Methods 0.000 description 6
- 241000283155 Delphinidae Species 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
Classifications
-
- 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
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
- G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B11/00—Transmission systems employing sonic, ultrasonic or infrasonic waves
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K1/00—Secret communication
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Computational Linguistics (AREA)
- Health & Medical Sciences (AREA)
- Audiology, Speech & Language Pathology (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Telephonic Communication Services (AREA)
- Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
Abstract
The invention belongs to the technical field of communication and aims to improve concealment of underwater acoustic communication. The technical scheme adopted by the invention is that the communication device for coding the whale sound harmonic quantity by using long limb pilot comprises a whale sound wave form memory, a whale sound grouping device, a communication parameter setting device, a communication encoder, a transducer, a hydrophone, a communication decoder and an output device, wherein the whale sound wave form memory, the whale sound grouping device, the communication encoder and the transducer are sequentially connected at a transmitting end, and the communication encoder is also connected with the communication parameter setting device; at the receiving end, the hydrophone, the communication decoder and the output device are connected in sequence. The invention is mainly applied to underwater communication occasions.
Description
Technical Field
The invention belongs to the technical field of communication, and particularly relates to a concealed communication method and device for coding by using the number of long-limb pilot whale sound harmonics.
Background
Underwater covert acoustic communication has a very important role in military applications. When an underwater acoustic communication device performs communication, an acoustic signal must be emitted into water to transmit the communication signal to a communication receiver. Since underwater acoustic communication devices must emit acoustic signals into the water that are easily detected and identified by enemy detection systems, the concealment of underwater concealed acoustic communication devices has a direct relationship with the acoustic signals emitted by the underwater concealed acoustic communication devices. In order to improve the concealment of underwater acoustic communication, the traditional method generally adopts a frequency-hopped linear frequency modulation signal as a carrier frequency waveform to increase the difficulty of an enemy detection system in decoding communication information, but the linear frequency modulation signal has very obvious characteristics, such as linear frequency change, rectangular power spectrum and the like, so that the enemy detection system is easy to pay attention, and once the enemy detection system notices the information, the enemy detection system can be utilized to locate or destroy underwater acoustic communication equipment.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to improve the concealment of underwater acoustic communication. The technical scheme adopted by the invention is that the communication device for coding the whale sound harmonic quantity by using long limb pilot comprises a whale sound wave form memory, a whale sound grouping device, a communication parameter setting device, a communication encoder, a transducer, a hydrophone, a communication decoder and an output device, wherein the whale sound wave form memory, the whale sound grouping device, the communication encoder and the transducer are sequentially connected at a transmitting end, and the communication encoder is also connected with the communication parameter setting device; at the receiving end, the hydrophone, the communication decoder and the output device are connected in sequence.
The invention has the characteristics and beneficial effects that:
the invention uses different sounds sent by the original long limb piloting whale to carry different communication information, and the communication mode can improve the concealment of the underwater concealed acoustic communication equipment.
Description of the drawings:
fig. 1 shows a time-frequency diagram of four types of calls described in the present invention.
Fig. 2 shows a communication delivery platform 10 according to the present invention.
Fig. 3 shows a communication reception platform 11 according to the invention.
In fig. 2: 1 is whale sound waveform memory; 2 is whale sound grouping device; 3 is a communication parameter setter; 4 is a communication encoder; 5 is information to be transmitted; and 6 is a transducer.
In fig. 3: 7 is a hydrophone; 8 is a communication decoder; and 9 is a communication information output device.
Detailed Description
Unlike traditional methods, the present invention proposes a new camouflage covert communication method and device that uses different sounds emitted by the original long limb pilot whale to carry different communication information. Because the sound emitted by whales in the ocean is generally recognized as a noise signal by a detection system of each country, the invention utilizes different sounds emitted by original long-limb pilot whales to carry different communication information, and can realize camouflage and hidden communication from the surface.
The invention provides a concealed communication method and device for coding by using the number of long-limb pilot whale sound harmonics.
From the literature it is known that the sound-producing characteristics of long-limb pilot whales are very rich, one of the important characteristics being that each sound they produce is generally composed of a main wave and a plurality of side waves (these side waves are generally called "harmonics", the term "harmonics" being used in the present invention in its entirety throughout the following description) and that different sounds generally have different numbers of harmonics. For example, in fig. 1, the present invention gives a time-frequency diagram of four kinds of sounds, including 1 main wave and 4 harmonics in fig. 1 (a), 1 main wave and 1 harmonic in fig. 1 (b), 1 main wave and 2 harmonics in fig. 1 (c), and 1 main wave and 15 harmonics in fig. 1 (d). Among different kinds of sounds, the sum of the number of dominant waves and harmonics is different from other kinds of sounds. It is assumed that M (M is a positive integer) calls can be found from those of the long limb piloted whale (and it is assumed that m=2 N (N is a positive integer)), the sum of the main wave and the harmonic wave number of each of the M calls being different from each other of the M calls; just like the four calls in fig. 1The sum of the main wave and the harmonic wave numbers of the four sounds is different from each other. Since m=2 N Therefore, M different calls are possible to encode the binary data of Nbit. For example, in FIG. 1, there are 4 different calls, so the four calls in FIG. 1 can encode 2 bits of binary data.
Further, whales in the invention refer to long-limb piloted whales;
further, the M different sounds that are found are stored in a whale sound waveform memory 1, which whale sound waveform memory 1 may be implemented as a synchronous dynamic memory (SDRAM);
further, the whale sound grouping unit 2 takes out whale sounds from the whale sound waveform memory 1, groups the whale sounds, and groups the whale sounds into a plurality of different sound groups according to the amount of the carried communication information; more specifically, 2 can be arbitrarily taken out from M different calls N-n (N is an integer less than N and greater than zero) and is divided into a group, and the group of calls is designated as G N-n The method comprises the steps of carrying out a first treatment on the surface of the For example, 2 can be taken out of M different calls N-1 The voices are divided into a group, and the group is named G N-1 Then the group of calls can carry N-1bit communication information; as another example, 2 can be taken from M different calls N -(N-1) The voices are divided into a group, and the group is named G 1 Then the group of calls can carry 1bit of communication information; further, the whale sound packetizer 2 may be implemented by a programmable logic device or a microprocessor chip;
further, the communication parameter setter 3 is configured to set the magnitude of the N-N value, to set the time interval T between the voices during communication, and to set three parameters of the sound source level SL of the voices during communication; further, the communication parameter setter 3 may be implemented by a programmable logic device or a microprocessor chip;
further, the communication encoder 4 recognizes the three parameters transmitted from the communication parameter setter 3; then, on the one hand, according to the size of N-N, the corresponding sound component is extracted from the whale sound grouping device 2Group G N-n Each call carries different N-nbit communication information; for example, if N-n=2, the communication encoder 4 will fetch the corresponding sound packet G from the whale sound packetizer 2 2 The call packet contains 4 different call pulses, and then the communication encoder 4 causes a first one of the 4 different call pulses to carry a "00" communication, a second one of the 4 different call pulses to carry a "01" communication, a third one of the 4 different call pulses to carry a "10" communication, and a fourth one of the 4 different call pulses to carry a "11" communication; on the other hand, the communication encoder 4 sets the time interval between every two adjacent voices to be T according to the time interval T between the voices, wherein the value range of T is 0s < T < 50s; on the other hand, the communication encoder 4 controls the transmission power of the sound signal output to the transducer 6 according to the value of the sound source level SL of the sound, wherein the magnitude of SL ranges from 0dB < SL < 300dB; further, the communication encoder 4 receives the communication information to be transmitted from the information to be transmitted 5 and then uses the selected call packet G N-n The communication information stored in the information to be transmitted 5 is converted into sound wave signals through the transducer 6 and sent out by the sound source stage SL at time intervals T; further, the communication encoder 4 may be implemented by a programmable logic device or a microprocessor chip;
further, after being transmitted underwater, the acoustic wave signal sent by the transducer 6 reaches a hydrophone 7 on a communication receiving platform, the acoustic wave is converted into an electric signal by the hydrophone 7 and then is transmitted to a communication decoder 8, the communication decoder 8 continuously performs normalized short-time Fourier transform on the received signal, and then a time-frequency spectrum of the whole received signal is obtained, and when the sound is received, a time-frequency spectrum similar to the sound in FIG. 1 appears; further, the communication decoder 8 also performs a normalized short-time energy spectrum calculation on the received signal, by setting a suitable threshold value TV1, to detect and locate the position and duration of each call in the received signal time sequence; wherein the value range of the threshold value TV1 is more than 0.01 and less than 0.8; nextThe communication decoder 8 searches for the number of main waves and harmonics contained in the time-frequency spectrum of each sound based on the location, duration and time-frequency spectrum of the sound; more specifically, the search process may be performed as follows: the first step: drawing Q straight lines (Q is a positive integer and 0 < Q < 10000000000) at equal intervals in the direction perpendicular to the time axis in the time-frequency diagram of the sound, and the second step: setting a threshold value TV2 (wherein the value range of the threshold value TV2 is 0.01 < TV2 < 0.8), finding out the peak point of the time-frequency diagram which is positioned in each drawn straight line and exceeds the threshold value TV2, then calculating the number of the peak points of the corresponding time-frequency diagram in each drawn straight line, and assuming that the number of the peak points of the corresponding time-frequency diagram on the L-th straight line is P L The number of the corresponding time-frequency diagram peak points on other straight lines is P 1 ,P 2 ,…,P Q The number of all peak points is then summed and averaged as followsThen, S is rounded off to give +.>This->The value is the sum of the number of main waves and harmonics corresponding to the sound; further, according to->Can decode the communication information carried by the call;
further, the communication decoder 8 continuously decodes the communication information and transmits the decoded communication information to the communication information output unit 9 to complete the whole communication process.
Claims (2)
1. A communication method for coding by using the number of long-limb pilot whale call harmonics is characterized in that M calls are found out from the long-limb pilot whale calls, and M=2 N M, N is justA number of bits, encoding N bits of binary data using M different calls, to effect communication; specifically: arbitrarily take out 2 from M different calls N-n The calls are divided into groups, N is an integer less than N and greater than zero, and the group of calls is designated G N-n ；
Selecting a corresponding call packet G according to the size of N-N N-n Each sound carries different N-N bits of communication information, the time interval between every two adjacent sounds is set as T in the communication process, and the time interval is transmitted according to the time interval;
at the receiving end, carrying out normalized short-time energy spectrum calculation on the received signals, and detecting and positioning the position and duration length of each sound in the received signal time sequence by setting a proper threshold value TV 1; wherein the value range of the threshold value TV1 is more than 0.01 and less than 0.8; then searching the number of the main wave and the harmonic wave contained in the time-frequency spectrum in each sound according to the position, the duration time and the time-frequency spectrum of each sound, calculating the sum value of the main wave and the harmonic wave corresponding to the sound, and decoding the communication information carried by the sound according to the sum value of the main wave and the harmonic wave;
more specifically, the search process proceeds as follows: the first step: drawing Q straight lines at equal intervals in the direction perpendicular to the time axis in the time-frequency diagram of the sound, wherein Q is a positive integer, and 0 < Q < 10000000000, and the second step: setting a threshold value TV2, wherein the value range of the threshold value TV2 is 0.01 < TV2 < 0.8, finding out the peak point of the time-frequency diagram which is positioned in each drawn straight line and exceeds the threshold value TV2, then calculating the number of the peak points of the corresponding time-frequency diagram in each drawn straight line, and assuming that the number of the peak points of the corresponding time-frequency diagram on the L-th straight line is P L The number of the corresponding time-frequency diagram peak points on other straight lines is P 1 ,P 2 ,…,P Q The number of all peak points is then summed and averaged as followsThen, S is rounded off to give +.>This->The value is the sum of the number of main waves and harmonics corresponding to the sound; further, according to->The communication information carried by the call can be decoded.
2. The communication device for coding by using the number of long limb pilot whale sound harmonics is characterized by comprising a whale sound waveform memory, a whale sound grouping device, a communication parameter setting device, a communication encoder, a transducer, a hydrophone, a communication decoder and an output device, wherein the whale sound waveform memory, the whale sound grouping device, the communication encoder and the transducer are sequentially connected at a transmitting end, and the communication encoder is also connected with the communication parameter setting device; at the receiving end, the hydrophone, the communication decoder and the output device are connected in sequence; specifically, the whale sound waveform memory is implemented by a synchronous dynamic memory SDRAM, and is used for storing M different sounds;
the whale sound grouping device is used for: generating whale sounds from the whale sound waveform memory, grouping the whale sounds, and dividing the whale sounds into a plurality of different sound groups according to the quantity of the carried communication information; more specifically, 2 is arbitrarily taken out from M different calls N-n The calls are divided into groups, N is an integer less than N and greater than zero, and the group of calls is designated G N-n The method comprises the steps of carrying out a first treatment on the surface of the The whale sound grouping device is realized by a programmable logic device or a microprocessor chip;
the communication parameter setter is used for setting the value of N-N, setting the time interval T between the sounds in the communication process and setting three parameters of the sound source level SL of the sounds in the communication process, and is realized by a programmable logic device or a microprocessor chip;
the communication encoder identifies the three parameters transmitted by the communication parameter setter; then, on the one hand, according to the size of N-N, the corresponding sound packet G is extracted from the whale sound packet device N-n Each call carries different N-nbit communication information; on the other hand, the communication encoder sets the time interval between every two adjacent voices as T according to the time interval T between the voices, wherein the value range of T is 0s < T < 50s; in yet another aspect, the communication encoder controls the transmit power of the sound signal output to the transducer based on the value of the sound source level SL of the sound, wherein SL ranges in magnitude from 0dB < SL < 300dB; further, the communication encoder receives the communication information to be transmitted and then uses the selected call packet G N-n The communication information to be transmitted is converted into sound wave signals through a transducer and sent out through a time interval T and a sound source stage SL; further, the communication encoder is implemented by a programmable logic device or a microprocessor chip;
the hydrophone converts the sound waves into electric signals and then transmits the electric signals to the communication decoder;
the communication decoder continuously performs normalized short-time Fourier transformation on the received signals, then obtains a time-frequency spectrum of the whole received signals, and when the sounds are received, the communication decoder simultaneously performs normalized short-time energy spectrum calculation on the received signals, and detects and locates the position and duration of each sound in the received signal time sequence by setting a proper threshold value TV 1; wherein the value range of the threshold value TV1 is more than 0.01 and less than 0.8; next, the communication decoder searches the number of main wave and harmonic wave contained in the time-frequency spectrum of each sound according to the position, duration time and time-frequency spectrum of the sound; more specifically, the search process proceeds as follows: the first step: drawing Q straight lines at equal intervals in the direction perpendicular to a time axis in a time-frequency diagram of the sound, wherein Q is a positive integer; and a second step of: setting a threshold value TV2, wherein the value range of the threshold value TV2 is more than 0.01 and less than 0.8, finding out the peak point of the time-frequency diagram which is positioned in each drawn straight line and exceeds the threshold value TV2, and then calculating each drawn straight lineThe number of corresponding time-frequency diagram peak points in the line is assumed to be P L The number of the corresponding time-frequency diagram peak points on other straight lines is P 1 ,P 2 ,…,P Q The number of all peak points is then summed and averaged as followsThen, S is rounded off to give +.>This->The value is the sum of the number of main waves and harmonics corresponding to the sound; further, according to->Can decode the communication information carried by the call;
further, the communication decoder continuously decodes the communication information and transmits the decoded communication information to the communication information output device so as to complete the whole communication process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711489378.2A CN108055087B (en) | 2017-12-30 | 2017-12-30 | Communication method and device for coding by using number of long-limb piloting whale sound harmonics |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711489378.2A CN108055087B (en) | 2017-12-30 | 2017-12-30 | Communication method and device for coding by using number of long-limb piloting whale sound harmonics |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108055087A CN108055087A (en) | 2018-05-18 |
| CN108055087B true CN108055087B (en) | 2024-04-02 |
Family
ID=62129889
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711489378.2A Active CN108055087B (en) | 2017-12-30 | 2017-12-30 | Communication method and device for coding by using number of long-limb piloting whale sound harmonics |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108055087B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108880698B (en) * | 2018-06-06 | 2023-06-06 | 天津大学 | Communication method and device based on whale sound pulse time length |
| CN109347568B (en) * | 2018-09-05 | 2021-04-20 | 哈尔滨工程大学 | Dolphin whistle-imitating continuous phase multi-element frequency modulation underwater acoustic communication method |
| CN109412703B (en) * | 2018-11-24 | 2021-05-11 | 天津大学 | Time delay difference coding method utilizing short pulse short-time energy spectrum timing |
| CN110247714B (en) * | 2019-05-16 | 2021-06-04 | 天津大学 | Bionic hidden underwater acoustic communication coding method and device integrating camouflage and encryption |
| CN111414832B (en) * | 2020-03-16 | 2021-06-25 | 中国科学院水生生物研究所 | Real-time online recognition and classification system based on whale dolphin low-frequency underwater acoustic signals |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105227246A (en) * | 2015-10-13 | 2016-01-06 | 哈尔滨工程大学 | A kind of underwater acoustic communication method utilizing segmentation LFM signal to imitate dolphin whistle signal |
| CN105408956A (en) * | 2013-06-21 | 2016-03-16 | 弗朗霍夫应用科学研究促进协会 | Method and apparatus for obtaining spectrum coefficients for a replacement frame of an audio signal, audio decoder, audio receiver and system for transmitting audio signals |
| 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 |
| CN106680823A (en) * | 2017-02-09 | 2017-05-17 | 天津大学 | Target distance and velocity detection method of utilizing sperm whale cry pulse |
-
2017
- 2017-12-30 CN CN201711489378.2A patent/CN108055087B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105408956A (en) * | 2013-06-21 | 2016-03-16 | 弗朗霍夫应用科学研究促进协会 | Method and apparatus for obtaining spectrum coefficients for a replacement frame of an audio signal, audio decoder, audio receiver and system for transmitting audio signals |
| CN105227246A (en) * | 2015-10-13 | 2016-01-06 | 哈尔滨工程大学 | A kind of underwater acoustic communication method utilizing segmentation LFM signal to imitate dolphin whistle signal |
| 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 |
| CN106680823A (en) * | 2017-02-09 | 2017-05-17 | 天津大学 | Target distance and velocity detection method of utilizing sperm whale cry pulse |
Non-Patent Citations (2)
| Title |
|---|
| 一种利用海豚叫声的仿生水声通信方法;刘凇佐;乔钢;尹艳玲;;物理学报(第14期);全文 * |
| 信息隐藏技术及隐蔽通信的抗干扰性分析;燕明;赵霖;卢洪涛;;舰船电子对抗(第06期);全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108055087A (en) | 2018-05-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108055087B (en) | Communication method and device for coding by using number of long-limb piloting whale sound harmonics | |
| CN103971695B (en) | A kind of underwater digital voice communication system of channel self-adapting and its method | |
| CN105391500B (en) | A kind of imitative dolphin ticktack sound underwater acoustic communication method based on ultra-broadband signal | |
| CN109347568B (en) | Dolphin whistle-imitating continuous phase multi-element frequency modulation underwater acoustic communication method | |
| CA2574468A1 (en) | Noise suppression process and device | |
| CN108880698B (en) | Communication method and device based on whale sound pulse time length | |
| CN103368660A (en) | Differential pattern time delay shift coding-based bionic underwater sound communication method | |
| CN102546486A (en) | Processing method for channel self-adaptation single carrier underwater acoustic coherent communication signals | |
| CN101969348B (en) | Portable underwater acoustic communication equipment and method for frogman | |
| EP2117140A1 (en) | A method of covertly transmitting information, a method of recapturing covertly transmitted information, a sonar transmitting unit, a sonar receiving unit and a computer program product for covertly transmitting information and a computer program product for recapturing covertly transmitted information | |
| CN109412703B (en) | Time delay difference coding method utilizing short pulse short-time energy spectrum timing | |
| Jia et al. | Bionic camouflage underwater acoustic communication based on sea lion sounds | |
| CN201846340U (en) | Portable underwater acoustic communication device for frogman | |
| CN1592161A (en) | M-ary spread spectrum communication method | |
| CN108279418B (en) | Combined detection and communication device and method using whale sound | |
| CN107332642A (en) | The low probability of intercept waveform design method synthesized based on ocean mammal signal | |
| CN106910508A (en) | A kind of hidden underwater acoustic communication method of imitative ocean piling sound source | |
| CN109347569A (en) | A kind of hidden underwater acoustic communication method of camouflage based on discrete cosine transform | |
| Sherlock et al. | Signal and receiver design for low-power acoustic communications using m-ary orthogonal code keying | |
| CN110149286A (en) | The signal processing method of the raising signal-to-noise ratio of digital communication under additive noise environment | |
| CN111064527B (en) | Camouflage hidden wireless networking communication method based on dark green bird-scaring | |
| CN104378124A (en) | Method and device for sending and receiving data with sound | |
| RU2619766C1 (en) | Method of data transmission | |
| CN108318883A (en) | A kind of distance weighted naturally based on entire spectrum energy converter is to computational methods | |
| RU2691745C1 (en) | Data transmission method |
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 |