CN108986827A - A kind of speech underwater live transmission method based on LiFi optic communication - Google Patents
A kind of speech underwater live transmission method based on LiFi optic communication Download PDFInfo
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- CN108986827A CN108986827A CN201810670127.2A CN201810670127A CN108986827A CN 108986827 A CN108986827 A CN 108986827A CN 201810670127 A CN201810670127 A CN 201810670127A CN 108986827 A CN108986827 A CN 108986827A
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 26
- 238000004891 communication Methods 0.000 title claims abstract description 18
- 238000000034 method Methods 0.000 title claims abstract description 17
- 230000003287 optical effect Effects 0.000 claims abstract description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000005286 illumination Methods 0.000 claims abstract description 7
- 230000009189 diving Effects 0.000 claims abstract description 5
- 230000006835 compression Effects 0.000 claims description 8
- 238000007906 compression Methods 0.000 claims description 8
- 230000006837 decompression Effects 0.000 claims description 6
- 230000003044 adaptive effect Effects 0.000 claims description 2
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 238000007667 floating Methods 0.000 claims description 2
- 238000003780 insertion Methods 0.000 claims 1
- 230000037431 insertion Effects 0.000 claims 1
- 238000001514 detection method Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000033001 locomotion Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 230000001839 systemic circulation Effects 0.000 description 1
Classifications
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- 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
- G10L19/04—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 using predictive techniques
- G10L19/16—Vocoder architecture
- G10L19/173—Transcoding, i.e. converting between two coded representations avoiding cascaded coding-decoding
-
- 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
- G10L19/04—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 using predictive techniques
- G10L19/16—Vocoder architecture
- G10L19/167—Audio streaming, i.e. formatting and decoding of an encoded audio signal representation into a data stream for transmission or storage purposes
-
- 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
-
- 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
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- Engineering & Computer Science (AREA)
- Signal Processing (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)
- Computer Networks & Wireless Communication (AREA)
- Optical Communication System (AREA)
Abstract
The invention belongs to speech underwater transmission technique fields, it is related to a kind of speech underwater live transmission method based on LiFi optic communication, form of communication is realized in the form of underwater intercom in water, pocket embedded device is mounted on diving apparatus, when use, scuba diver is illuminated and is communicated simultaneously using pocket embedded device, is only limited by the illumination zone of intelligencer itself, is realized and by the real-time speech communicating of intelligencer；Pocket embedded device switches between transmitting terminal and receiving end, carries out selection control according to demand.The present invention provides a kind of efficient, portable, the inexpensive speech underwater live transmission method based on optic communication, solves the blank of speech underwater transmission method currently on the market.Diving worker etc. can be allowed to facilitate under water and exchange and work by introducing optical transmission module and optical receiver module based on the method.
Description
Technical field
The invention belongs to speech underwater transmission technique field, it is related to a kind of speech underwater based on LiFi optic communication and passes in real time
Transmission method.
Background technique
Hydroxyl in water is different to the electromagnetic wave absorptivity of different frequencies, causes radio wave in water can be sharply
Attenuation, therefore cannot be used in subsurface communication, and visible light is that can propagate in water.LiFi, that is, visible light wireless communication, again
Claim " light fidelity technology ", is a kind of completely new wireless transmission carried out data transmission using visible light spectrum (light that such as light bulb issues)
Technology, LIFI are that wireless communication is realized with visible light, i.e., utilize electric signal control by installing microchip additional to common LED bulb
The high speed scintillation signal being invisible to the naked eye that light emitting diode (LED) processed issues transmits information.LED light network passes through visible
Light carrys out transmission network signal, can directly be completed using the existing energy consumption output such as street lamp, room lighting and public illumination
Dual role.The speech underwater real-time Transmission that radio wave cannot achieve, and its can be realized using LIFI optical communication technique
Hardware cost is extremely low, can be applied to most underwater equipments portablely, has filled up the market vacancy of speech underwater transmission.
Summary of the invention
There is low efficiency for current speech underwater transmission device, be not easy portable, at high cost, proposition one in the present invention
Speech underwater real-time transmission system of the kind based on LiFi optic communication.
Technical solution of the present invention:
A kind of speech underwater live transmission method based on LiFi optic communication, form of communication is with the shape of underwater intercom in water
Formula is realized, pocket embedded device is mounted on diving apparatus, in use, scuba diver is same using pocket embedded device
Shi Jinhang illumination and communication are only limited by the illumination zone of intelligencer itself, are realized and by the real-time speech communicating of intelligencer；Just
It takes type embedded device to switch between transmitting terminal and receiving end, carries out selection control according to demand；
When pocket embedded device is as transmitting terminal, user speaks to Audio Input Modules (transmitter), audio input
Speech content is converted to analog electrical signal by module, is passed to audio codec, and audio coder utilizes the ADC mould built in it
Analog electrical signal is converted to the accessible initial digital signal of embedded microprocessor, and is supported by audio coder by block
I2S interface protocol be transmitted to embedded microprocessor；Embedded microprocessor is compiled using the pulse of IMA-ADPCM adaptive differential
Code modulator approach carries out compressed encoding to initial digital signal, and by tabling look-up, fixed point prediction replaces complicated floating number student movement
It calculates, significantly reduces the complexity of algorithm；
ADPCM coding: 16 PCM sampled values are compressed into 4 ADPCM encoded radios by embedded microprocessor,
Compression ratio is 1:4；In order to make visible light maintain the function of device illumination when transmitting data, and it is unlikely to the code of factor word signal
Value is uneven and generates the bright situation of bright back light, is balanced coding to compression digital signal in embedded microprocessor；
Balance code makes 1 and 0 in compression digital signal, i.e. the frequency of low and high level appearance is equal, so that transmitting light is protected
It is fixed to keep steady；
It balances digital signal to be issued by the signal pins of embedded microprocessor, the control signal as transmitting light；Think
The output power of embedded microprocessor can not directly drive relatively high power light-emitting device such as LED etc., and LED need to be via driving electricity
Road is driven, and driving circuit controls the light on and off of LED according to input signal.
Optical transmission module is realized by driving circuit: LED is powered by external power supply, and feeder ear is controlled by photo-coupler
System, it is illuminating state that when the input terminal input high level signal of photo-coupler, output end coupling, LED, which is powered,；Work as optocoupler
The input terminal input low level signal of clutch, output end disconnect, and LED loses power supply, are OFF state；The conversion speed of photo-coupler
Rate is up to 10MBit/, can meet the signal output of high frequency completely.
When pocket embedded device is as receiving end, light receiving module receives the various light sources in environment；Light receives mould
Block includes photoelectric converter, amplifier and high-speed comparator；
Photoelectric converter uses the photodiode of PIN type, and the photodiode of the type mixes one among PN junction
The very low N-type semiconductor of layer concentration, so that it may which the width for increasing depletion region reaches the influence for reducing diffusion motion, improves response
The purpose of speed.Therefore it is suitable for the reception and conversion of high frequency optical signal.
Photodiode converts optical signals to faint analog electrical signal, which amplifies by precision instrument
Device amplifies, and generates the biggish waveform of amplitude；Amplified waveform removes portion smoother in signal by high-speed comparator
Divide such as stable environment light, and then isolate the signal light with data characteristics, feature is to detect the high high electricity of light intensity output
Flat, low light intensity exports low level, and the optical signal of acquisition is thus converted to digital signal；
The signal received is the balance digital signal in transmitting terminal by coding, directly incoming embedded microprocessor,
Balanced code decoding is first carried out, decodes the compression digital signal before transmitting terminal is balanced coding, then decode decompression through ADPCM
Digital signal, decompression digital signal spread out of embedded microprocessor, drive audio codec, audio by I2S interface protocol
Decompression digital signal is reduced to the audio analog signals of most initial by codec, can directly drive audio output module such as waterproof
Earphone, loudspeaker etc. make a sound；So far, realize that voice carries out real-time Transmission between transmitting terminal, receiving end.
Beneficial effects of the present invention: the present invention provides a kind of efficient, portable, the inexpensive underwater language based on optic communication
Sound live transmission method solves the blank of speech underwater transmission method currently on the market.Based on the method, by introducing light hair
Module and optical receiver module are sent, diving worker etc. can be allowed to facilitate under water and exchange and work.
Detailed description of the invention
Fig. 1 is hardware structure diagram of the invention.
Fig. 2 is system architecture diagram of the invention.
Fig. 3 is program chart of the invention.
Specific embodiment
Below in conjunction with attached drawing and technical solution, a specific embodiment of the invention is further illustrated.
In conjunction with Fig. 3, enter from host process, is the initialization of hardware device, including interrupt vector initialization, timer first
Initialization, application initialization.Wherein, application program undertakes the operation of entire voice-transmission system.The application being initialised
Program includes: for the LED control program initialization of prompt, by key control program initialization, data queue's initialization and sound
Frequency processing initialization.
After the completion of initialization, program enters system systemic circulation；
Whether program detection device mode first sends out switching (being initially no), if switching, correspond to specific mode into
The initialization of row pattern switching gets out running environment for associative mode；If not switching, successively detection is serviced:
Reception service, detection device mode are initially entered, if (otherwise equipment in a receive mode, runs reception service
Jump out into next service), including obtaining the data received from hardware layer, data are decoded by balanced code, after decoding
Data-pushing to application layer wait in next step operate；
Enter the service of transmission later, detection device mode, if equipment in a receive mode, is jumped out, if sending mode,
Transmission service is then run, including needs data to be sent from application layer acquisition, by balance code, the data after coding are pushed away
It send to hardware layer and is sent；
Enter audio processing service later, detection device mode is pushed before receiving if equipment is in a receive mode
Audio decoder is carried out to the data of application layer, and to the data being pushed, audio-frequency module is written into decoded data later,
Drive peripheral equipment work；If sending mode, then the data received from audio-frequency module are read, the data received are carried out
Audio coding, and the data write-in after coding is sent into processing queue, wait hardware layer to send.
Claims (1)
1. a kind of speech underwater live transmission method based on LiFi optic communication, which is characterized in that form of communication is in water with underwater
The form of intercom is realized, pocket embedded device is mounted on diving apparatus, in use, scuba diver is embedding using pocket
Enter formula equipment while being illuminated and being communicated, only limit by the illumination zone of intelligencer itself, realize with by the real-time of intelligencer
Voice communication；Pocket embedded device switches between transmitting terminal and receiving end, carries out selection control according to demand；
When pocket embedded device is as transmitting terminal, user speaks to Audio Input Modules, and Audio Input Modules will speak interior
Appearance is converted to analog electrical signal, is passed to audio codec, audio coder is using the ADC module built in it, by analog telecommunications
The accessible initial digital signal of embedded microprocessor number is converted to, and passes through the I2S interface protocol that audio coder is supported
It is transmitted to embedded microprocessor；Embedded microprocessor uses IMA-ADPCM adaptive difference pulse code modulator approach, right
Initial digital signal carries out compressed encoding, and by tabling look-up, fixed point prediction replaces complicated floating point math operation, greatly reduces
The complexity of algorithm；
ADPCM coding: 16 PCM sampled values are compressed into 4 ADPCM encoded radios by embedded microprocessor, compression
Than for 1:4；
In order to make visible light maintain the function of device illumination when transmitting data, and the code value that is unlikely to factor word signal it is uneven and
The bright situation of bright back light is generated, coding is balanced to compression digital signal in embedded microprocessor；Balance code makes
It obtains 1 and 0 in compression digital signal, i.e. the frequency of low and high level appearance is equal, so that transmitting light keeps stablizing；
It balances digital signal to be issued by the signal pins of embedded microprocessor, the control signal as transmitting light；Think insertion
The output power of microsever can not directly drive light-emitting device, and light-emitting device is driven via driving circuit, drive
Dynamic circuit controls the light on and off of light-emitting device according to input signal；
Optical transmission module is realized by driving circuit: light-emitting device is powered by external power supply, and feeder ear is carried out by photo-coupler
Control, when the input terminal input high level signal of photo-coupler, output end coupling, light-emitting device is powered, to light shape
State；When the input terminal input low level signal of photo-coupler, output end is disconnected, and light-emitting device loses power supply, is OFF state；
When pocket embedded device is as receiving end, light receiving module receives the various light sources in environment；Light receiving module packet
Containing photoelectric converter, amplifier and high-speed comparator；
Photoelectric converter uses the photodiode of PIN type, and photodiode converts optical signals to faint analog electrical signal,
Analog electrical signal is amplified by amplifier, generates the biggish waveform of amplitude；Amplified waveform is gone by high-speed comparator
Except part smoother in signal, and then the signal light with data characteristics is isolated, feature is to detect that high light intensity output is high
Level, low light intensity export low level, the optical signal of acquisition are thus converted to digital signal；
The signal received is the balance digital signal in transmitting terminal by coding, directly incoming embedded microprocessor, advanced
The decoding of row balanced code decodes the compression digital signal before transmitting terminal is balanced coding, then decodes decompression number through ADPCM
Signal, decompression digital signal spread out of embedded microprocessor, drive audio codec by I2S interface protocol, audio compiles solution
Decompression digital signal is reduced to the audio analog signals of most initial by code device, is directly driven audio output module and is made a sound；Extremely
This, realizes that voice carries out real-time Transmission between transmitting terminal, receiving end.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810670127.2A CN108986827B (en) | 2018-06-21 | 2018-06-21 | Underwater voice real-time transmission method based on LiFi optical communication |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810670127.2A CN108986827B (en) | 2018-06-21 | 2018-06-21 | Underwater voice real-time transmission method based on LiFi optical communication |
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| CN108986827A true CN108986827A (en) | 2018-12-11 |
| CN108986827B CN108986827B (en) | 2022-09-06 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109936408A (en) * | 2019-01-12 | 2019-06-25 | 上海贵霖通信技术有限公司 | A kind of underwater communication apparatus and its application method using visible light |
| CN116170031A (en) * | 2023-04-20 | 2023-05-26 | 鹏城实验室 | Portable wearable underwater wireless optical communication device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5867768A (en) * | 1995-09-13 | 1999-02-02 | Baldwin-Japan, Ltd. | Simultaneous multidirectional communication apparatus |
| CN102098111A (en) * | 2011-02-15 | 2011-06-15 | 中国科学院半导体研究所 | Underwater voice communication system through light-emitting diode (LED) light source and diving helmet |
| CN201971139U (en) * | 2011-02-22 | 2011-09-14 | 陕西科技大学 | Optical communication diving suit with high power LED (Light Emitting Diode) |
| JP2017228889A (en) * | 2016-06-21 | 2017-12-28 | 株式会社島津製作所 | Underwater communication device and underwater radiation device |
-
2018
- 2018-06-21 CN CN201810670127.2A patent/CN108986827B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5867768A (en) * | 1995-09-13 | 1999-02-02 | Baldwin-Japan, Ltd. | Simultaneous multidirectional communication apparatus |
| CN102098111A (en) * | 2011-02-15 | 2011-06-15 | 中国科学院半导体研究所 | Underwater voice communication system through light-emitting diode (LED) light source and diving helmet |
| CN201971139U (en) * | 2011-02-22 | 2011-09-14 | 陕西科技大学 | Optical communication diving suit with high power LED (Light Emitting Diode) |
| JP2017228889A (en) * | 2016-06-21 | 2017-12-28 | 株式会社島津製作所 | Underwater communication device and underwater radiation device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109936408A (en) * | 2019-01-12 | 2019-06-25 | 上海贵霖通信技术有限公司 | A kind of underwater communication apparatus and its application method using visible light |
| CN116170031A (en) * | 2023-04-20 | 2023-05-26 | 鹏城实验室 | Portable wearable underwater wireless optical communication device and method |
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| CN108986827B (en) | 2022-09-06 |
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