CN108986827B - Underwater voice real-time transmission method based on LiFi optical communication - Google Patents
Underwater voice real-time transmission method based on LiFi optical communication Download PDFInfo
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- CN108986827B CN108986827B CN201810670127.2A CN201810670127A CN108986827B CN 108986827 B CN108986827 B CN 108986827B CN 201810670127 A CN201810670127 A CN 201810670127A CN 108986827 B CN108986827 B CN 108986827B
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 27
- 238000004891 communication Methods 0.000 title claims abstract description 26
- 230000003287 optical effect Effects 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000005286 illumination Methods 0.000 claims abstract description 10
- 230000009189 diving Effects 0.000 claims abstract description 3
- 230000006835 compression Effects 0.000 claims description 4
- 238000007906 compression Methods 0.000 claims description 4
- 238000007667 floating Methods 0.000 claims description 2
- 238000005070 sampling Methods 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 description 4
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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
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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
- G10L19/167—Audio streaming, i.e. formatting and decoding of an encoded audio signal representation into a data stream for transmission or storage purposes
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- 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
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- 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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Abstract
The invention belongs to the technical field of underwater voice transmission, and relates to an underwater voice real-time transmission method based on LiFi optical communication.A water communication form is realized in the form of an underwater interphone, portable embedded equipment is installed on diving equipment, and when the underwater voice real-time transmission method is used, a diver uses the portable embedded equipment to simultaneously carry out illumination and communication, only in the illumination range of the communication partner, so as to realize real-time voice communication with the communication partner; the portable embedded equipment is switched between the transmitting terminal and the receiving terminal, and selection control is carried out according to requirements. The invention provides an efficient, portable and low-cost underwater voice real-time transmission method based on optical communication, and solves the blank of the underwater voice transmission method in the current market. Based on the method, the diver can conveniently communicate and work underwater by introducing the light transmitting module and the light receiving module.
Description
Technical Field
The invention belongs to the technical field of underwater voice transmission, and relates to an underwater voice real-time transmission method based on LiFi optical communication.
Background
The absorption rate of the hydroxide radical in water to electromagnetic waves of different frequencies is different, so that radio waves are rapidly attenuated in water, the water cannot be used for underwater communication, and visible light can be transmitted in water. LiFi is a brand new wireless transmission technology that uses visible light spectrum (such as light emitted by a bulb) for data transmission, and LiFi is a brand new wireless transmission technology that uses visible light to realize wireless communication, i.e., information is transmitted by adding a microchip to a common LED bulb to control a high-speed flashing signal emitted by a Light Emitting Diode (LED) by an electric signal, which cannot be seen by naked eyes. The LED optical network transmits network signals through visible light, and can directly utilize the existing energy consumption output of street lamps, indoor illumination, public illumination and the like to complete double tasks. The LIFI optical communication technology can be used for realizing real-time underwater voice transmission which cannot be realized by radio waves, the hardware cost is extremely low, the LIFI optical communication technology can be portably applied to most underwater equipment, and the market gap of underwater voice transmission is filled.
Disclosure of Invention
The invention provides an underwater voice real-time transmission system based on LiFi optical communication, aiming at the problems of low efficiency, difficulty in carrying and high cost of the existing underwater voice transmission equipment.
The technical scheme of the invention is as follows:
an underwater voice real-time transmission method based on LiFi optical communication is characterized in that an underwater communication mode is realized in the form of an underwater interphone, a portable embedded device is installed on diving equipment, when the underwater voice real-time transmission method is used, a diver uses the portable embedded device to simultaneously carry out illumination and communication, only in the illumination range of the diver, and the real-time voice communication with the diver is realized; the portable embedded equipment is switched between the transmitting terminal and the receiving terminal and is selectively controlled according to the requirement;
when the portable embedded equipment is used as a transmitting end, a user speaks to an audio input module (a microphone), the audio input module converts the speaking content into an analog electric signal and transmits the analog electric signal into an audio coder-decoder, the audio coder converts the analog electric signal into an initial digital signal which can be processed by an embedded microprocessor by using an ADC module arranged in the audio coder, and the initial digital signal is transmitted to the embedded microprocessor through an I2S interface protocol supported by the audio coder; the embedded microprocessor uses an IMA-ADPCM self-adaptive differential pulse coding modulation method to carry out compression coding on the initial digital signal, replaces complex floating point mathematical operation by table look-up fixed point prediction, and greatly reduces the complexity of the algorithm;
ADPCM coding: the embedded microprocessor compresses a 16-bit PCM sampling value into a 4-bit ADPCM coding value, and the compression ratio is 1: 4; in order to maintain the illumination function of the equipment when visible light transmits data and avoid the condition of light and shade flicker caused by uneven code values of digital signals, the compressed digital signals are subjected to balanced coding in the embedded microprocessor;
the balanced encoding makes 1 and 0, i.e. the frequency of occurrence of high and low levels, in the compressed digital signal equal, so that the emitted light remains stable;
the balance digital signal is sent out by a signal pin of the embedded microprocessor and is used as a control signal of emitted light; the output power of the embedded microprocessor cannot directly drive high-power light emitting devices such as LEDs, the LEDs need to be driven by a driving circuit, and the driving circuit controls the on and off of the LEDs according to input signals.
The optical transmission module is realized by a driving circuit: the LED is powered by an external power supply, the power supply end is controlled by the optical coupler, when a high-level signal is input into the input end of the optical coupler, the output end is coupled, the LED is powered and is in a lighting state; when the input end of the optical coupler inputs a low level signal, the output end is disconnected, the LED loses power supply and is in an off state; the conversion rate of the optical coupler is up to 10MBit/, and the high-frequency signal output can be completely met.
When the portable embedded equipment is used as a receiving end, the light receiving module receives various light sources in the environment; the light receiving module comprises a photoelectric converter, an amplifier and a high-speed comparator;
the photoelectric converter adopts a PIN type photodiode, and a layer of N type semiconductor with low concentration is doped in the middle of a PN junction of the PIN type photodiode, so that the width of a depletion region can be increased, the influence of diffusion motion is reduced, and the response speed is improved. And is therefore suitable for the reception and conversion of high frequency optical signals.
The photodiode converts an optical signal into a weak analog electrical signal, and the analog electrical signal is amplified by a precision instrument amplifier to generate a waveform with a larger amplitude; the amplified waveform passes through a high-speed comparator to remove smoother parts such as stable ambient light and the like in the signal, so that signal light with data characteristics is separated, and the characteristics are that high light intensity is detected to output high level, low light intensity is detected to output low level, and therefore the acquired optical signal is converted into a digital signal;
the received signal is a balanced digital signal which is encoded at a sending end, the balanced digital signal is directly transmitted into an embedded microprocessor, balanced code decoding is firstly carried out, a compressed digital signal before the balanced encoding at the sending end is decoded, then a decompressed digital signal is decoded by ADPCM, the decompressed digital signal is transmitted out of the embedded microprocessor, an audio codec is driven by an I2S interface protocol, the decompressed digital signal is restored into the most initial audio analog signal by the audio codec, and an audio output module such as a waterproof earphone, a loudspeaker and the like can be directly driven to make sound; therefore, real-time transmission of voice between the sending end and the receiving end is achieved.
The invention has the beneficial effects that: the invention provides an efficient, portable and low-cost underwater voice real-time transmission method based on optical communication, and solves the blank of the underwater voice transmission method in the current market. Based on the method, the diver can conveniently communicate and work underwater by introducing the light transmitting module and the light receiving module.
Drawings
Fig. 1 is a hardware configuration diagram of the present invention.
Fig. 2 is a system architecture diagram of the present invention.
Fig. 3 is a block diagram of the process of the present invention.
Detailed Description
The following further describes a specific embodiment of the present invention with reference to the drawings and technical solutions.
With reference to fig. 3, the entry from the main process is the initialization of the hardware device, including the initialization of the interrupt vector, the initialization of the timer, and the initialization of the application program. Wherein the application program undertakes the operation of the entire speech transmission system. The initialized application programs comprise: LED control program initialization for prompting, key control program initialization, data queue initialization and audio processing initialization.
After initialization is finished, the program enters a system major loop;
firstly, a program detects whether the equipment mode is switched (the initial condition is no), if the equipment mode is switched, the mode switching initialization is carried out corresponding to the specific mode, and a running environment is prepared for the corresponding mode; if the switching does not occur, the following services are detected in sequence:
firstly, entering a receiving service, detecting a device mode, if the device is in the receiving mode, operating the receiving service (otherwise, jumping out to enter the next service), wherein the method comprises the steps of acquiring received data from a hardware layer, decoding the data through a balanced code, and pushing the decoded data to an application layer to wait for the next operation;
then entering a sending service, detecting a device mode, jumping out if the device is in a receiving mode, and running the sending service if the device is in the sending mode, wherein the sending service comprises the steps of acquiring data to be sent from an application layer, carrying out balanced coding, and pushing the coded data to a hardware layer for sending;
then, entering an audio processing service, detecting a device mode, if the device is in a receiving mode, receiving data pushed to an application layer before, performing audio decoding on the pushed data, writing the data to be decoded into an audio module, and driving peripheral equipment to work; and if the mode is the sending mode, reading the data received from the audio module, carrying out audio coding on the received data, writing the coded data into a sending processing queue, and waiting for the hardware layer to send.
Claims (1)
1. An underwater voice real-time transmission method based on LiFi optical communication is characterized in that the underwater communication mode is realized in the form of an underwater interphone, a portable embedded device is installed on diving equipment, when the underwater voice real-time transmission method is used, a diver uses the portable embedded device to simultaneously carry out illumination and communication, only in the illumination range of the communication partner, and the real-time voice communication with the communication partner is realized; the portable embedded equipment is switched between the transmitting terminal and the receiving terminal and is selectively controlled according to the requirement;
when the portable embedded equipment is used as a transmitting end, a user speaks into the audio input module, the audio input module converts the speaking content into an analog electric signal and transmits the analog electric signal into the audio coder-decoder, the audio coder converts the analog electric signal into an initial digital signal which can be processed by the embedded microprocessor by utilizing an ADC module arranged in the audio coder and transmits the initial digital signal to the embedded microprocessor through an I2S interface protocol supported by the audio coder; the embedded microprocessor uses an IMA-ADPCM self-adaptive differential pulse coding modulation method to carry out compression coding on the initial digital signal, replaces complex floating point mathematical operation by table lookup fixed point prediction, and greatly reduces the complexity of the algorithm;
ADPCM coding: the embedded microprocessor compresses a 16-bit PCM sampling value into a 4-bit ADPCM coding value with the compression ratio of 1: 4;
in order to maintain the illumination function of the equipment when visible light transmits data and avoid the condition of light and shade flicker caused by uneven code values of digital signals, the compressed digital signals are subjected to balanced coding in the embedded microprocessor; the balanced encoding makes 1 and 0, i.e. the frequency of occurrence of high and low levels, in the compressed digital signal equal, so that the emitted light remains stable;
the balance digital signal is sent out by a signal pin of the embedded microprocessor and is used as a control signal of emitted light; the output power of the embedded microprocessor can not directly drive the light emitting device, the light emitting device is driven by the driving circuit, and the driving circuit controls the on and off of the light emitting device according to the input signal;
the optical transmission module is realized by a driving circuit: the light emitting device is powered by an external power supply, the power supply end is controlled by the optical coupler, when a high-level signal is input into the input end of the optical coupler, the output end is coupled, and the light emitting device is powered and is in a lighting state; when the input end of the optical coupler inputs a low level signal, the output end is disconnected, the light emitting equipment loses power supply and is in an off state;
when the portable embedded equipment is used as a receiving end, the light receiving module receives a light source in the environment; the light receiving module comprises a photoelectric converter, an amplifier and a high-speed comparator;
the photoelectric converter adopts a PIN type photodiode, the photodiode converts an optical signal into a weak analog electrical signal, and the analog electrical signal is amplified by an amplifier to generate a waveform with a larger amplitude; the amplified waveform passes through a high-speed comparator to remove a smoother part in the signal, so that signal light with data characteristics is separated, the characteristics are that high light intensity is detected to output high level, low light intensity is detected to output low level, and therefore the acquired optical signal is converted into a digital signal;
the received signal is a balanced digital signal which is encoded at a sending end, the balanced digital signal is directly transmitted into an embedded microprocessor, balanced code decoding is firstly carried out, a compressed digital signal before the balanced encoding at the sending end is decoded, then a decompressed digital signal is decoded by ADPCM, the decompressed digital signal is transmitted out of the embedded microprocessor, an audio coder-decoder is driven through an I2S interface protocol, the decompressed digital signal is restored into an initial audio analog signal by the audio coder-decoder, and an audio output module is directly driven to make a sound; therefore, real-time transmission of voice between the sending end and the receiving end is achieved.
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| 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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| JPH09139690A (en) * | 1995-09-13 | 1997-05-27 | Nippon Baldwin Kk | Speaking system |
| 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) |
| JP6821965B2 (en) * | 2016-06-21 | 2021-01-27 | 株式会社島津製作所 | Underwater communication device and underwater irradiation device |
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