CN103457903B - A kind of digital underwater voice communication device and underwater voice communication method - Google Patents
A kind of digital underwater voice communication device and underwater voice communication method Download PDFInfo
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Abstract
The invention discloses a kind of digital underwater voice communication device and underwater voice communication method.Mainly solve the information communication issue between underwater performance personnel.This device is utilized respectively different hardware platforms and achieves voice compression coding and underwater sound communication, OFDM modulation technique and MBE voice compression technique have been used in combination, by channel estimation module to channel estimate in real time channel self-adapting can be changed messaging parameter and the compression bit rate of this device, and provide the half-duplex underwater sound communication of user speech and text both of which.This device can be widely applied to various underwater performance, such as archaeology under water, communicates between underwater hiding-machine, communicates between diver, and the field such as the communication between underwater performance personnel and bank base, can realize good subsurface communication, have stronger practicality.
Description
Technical field
The present invention relates to subsurface communication field, combine OFDM (OFDM) technology and polygon particularly to one
The digital underwater voice communication device of band excitation (MBE) low bit-rate voice compression technique and underwater voice communication method.
Background technology
In recent years, along with the development of water sound communication technique, the digital underwater sound voice communication of voice compression technique is combined
It is widely used in military and civilian field, such as seafari, under water archaeology, frog inter-personal communication, submarine or naval vessel and bank base
Communication etc. between control station.Underwater sound voice communication technology also experienced by the evolution of analog to digital, simulation in the early stage
Stage of modulating is in order to reduce bandwidth, and underwater sound communication often uses the technology such as single sideband modulation.Fast along with Digital Signal Processing
Speed development and the extensive application of large scale integrated circuit technology, digital signal processor (DSP) is with its efficient computing capability and spirit
The programming mode lived increasingly is favored by developer, voice communication entering with digital signal processor as core the most progressively
In the high-speed digital communication epoch of the heart, comparing to analog systems, digital vaccum tube voltmeter has then embodied to be easy to encrypt, be prone to
Superior function in the digitized processing such as integrated, miniaturization, channel matched are strong and mechanical dimension.
Not enough present in the design of voice communication assembly under water and difficult point has: (1) is at the underwater sound of limited bandwidth resources
Channel to carry out real-time, continuous, the compress speech of big data quantity and underwater sound data communication, adds voice compression coding and water
Sound communication algorithm realize difficulty；(2) communication of algorithms and speech coding algorithm are embodied as same hardware platform, water sound communication technique
Generally use DSP as realizing platform, and on DSP, realize the communication of algorithms and speech coding algorithm can consume substantial amounts of money simultaneously
Source, the performance of algorithm to be sacrificed realizes the function of voice communication of entirety；(3) underwater acoustic channel has Space Time-frequency change
Etc. complex characteristics, the communication of algorithms the to be considered adaptation ability to Complex Channel during design, there is no the underwater sound of adaptation function
Voice communication apparatus applied environment relatively limits to, and practicality is relatively low.
Summary of the invention
It is an object of the invention to provide a kind of subsurface communication more stable, be provided that various information communication form, communication are calculated
The more preferable digital underwater speech communication device of method performance.The present invention also aims to provide a kind of underwater voice communication side
Method.
The digital underwater voice communication device that the present invention relates to contains voice acquisition module, voice coding module, sends out
Penetrate end speech control module, OFDM modulation module, underwater sound signal transmitter module, underwater sound signal receiver module, OFDM demodulation module,
Receiving terminal speech control module, tone decoding module, voice playing module and channel estimation module；Voice acquisition module is from Mike
Adopt to obtain voice signal at wind, transmit it to voice coding module, then by the transmitting voice signal after encoded to transmitting terminal language
Sound control module, then the signal after encryption is transmitted to OFDM modulation module, then comprise through the transmitting of underwater sound signal transmitter module
The underwater sound signal of voice messaging；Received the underwater sound signal comprising voice messaging by underwater sound signal receiver module at receiving terminal,
Transmit it to OFDM demodulation module, then transmit to receiving terminal speech control module, then the signal after deciphering is transmitted to voice
Decoder module, transmitting voice signal is to voice playing module the most at last, realizes speech play by speaker；Channel
Estimation module, exports the estimated result to channel in real time to OFDM modulation module, OFDM demodulation module, transmitting terminal and receiving terminal
Speech control module, makes this device that channel is had adaptive adjustment capability, can change in real time according to the estimated result of channel
Become messaging parameter and compression bit rate.
The digital underwater voice communication device that the present invention relates to, is integrated with OFDM modulation technique and MBE voice coder simultaneously
Code technology.Different hardware platforms is utilized to realize from the algorithm of underwater sound communication the coding of voice signal.The coding of voice signal
Use special compress speech chip AMBE3000, coordinate and be controlled with single-chip microcomputer；The communication of algorithms in underwater sound communication uses
DSP realizes, and coordinates and is controlled with Xilinx FPGA.
The digital underwater voice communication device that the present invention relates to can carry out voice and the half-duplex of text both of which
Underwater sound communication, by voice text handover module can realize the switching of two kinds of mode of operations.Voice text handover module even
It is connected to the speech control module of transmitting terminal and receiving terminal, and utilizes serial ports to realize between textcommunication interface and speech control module
Connection.
The voice communication method of a kind of digital underwater voice communication device utilizing the present invention, comprises the steps:
(1) at voice transmission end, use CODEC that the voice signal from Mike is sampled, be quantified as digital speech
Signal；
(2) at voice transmission end, it is compressed compiling to the audio digital signals that step (1) obtains with voice coding module
Code；
(3) at voice transmission end, with transmitting terminal speech control module, the speech data obtained in step (2) is added
Close；
(4) at voice transmission end, the signal that step (3) uses DSP, obtain according to channel estimation case carries out OFDM tune
System, and ofdm signal is amplified and filters, use power amplifier and transmitting transducer that acoustical signal is transmitted in underwater acoustic channel biography
Broadcast；
(5) at phonetic incepting end, the result estimated according to channel, to receiving the OFDM of coming in underwater sound signal receiver module
Signal is filtered, amplifies, and re-uses AD and carries out sampling, quantifying；
(6) at phonetic incepting end, the signal obtaining step (5) is analyzed, and obtains the result parameter that channel is estimated；
(7) at phonetic incepting end, OFDM demodulation is carried out according to the parameter docking collection of letters number that step (6) obtains；
(8) at phonetic incepting end, the data obtaining step (7) are decrypted；
(9) at phonetic incepting end, use tone decoding module that the data obtained in step (8) are decompressed；
(10) at phonetic incepting end, use CODEC that the data that step (9) obtains are carried out DA conversion, and pass through speaker
Play output voice.
A kind of textcommunication method of digital underwater voice communication device utilizing the present invention, comprises the steps:
1) be switched to text communication mode by the knob on device panel, channel estimation module for textcommunication to letter
Road is estimated, modulation parameter is reset according to estimated result；
2) at text transmitting terminal, text message to be sent is sent to transmitting terminal speech control module by serial ports,
Transmitting terminal speech control module is then forwarded to OFDM modulation module after receiving；
3) at text transmitting terminal, the text data received is added by the result that OFDM modulation module is estimated according to channel
Close and modulation；
4) at text transmitting terminal, underwater sound signal sending module is sent to the underwater sound by power amplifier and transducer after being amplified by signal
In channel；
5) at received text end, the underwater sound signal that reception comes is amplified underwater sound signal receiver module filtering and AD turns
Change；
6) at received text end, the signal received is analyzed by channel estimation module, obtains now to channel estimation
Result parameter；
7) at received text end, OFDM demodulation module according to the channel parameter estimated by decrypted signal and demodulation, and by number
According to being sent to receiving terminal speech control module；
8) at received text end, receiving terminal speech control module uses serial ports the data received to be shown in communication interface
Show.
The present invention has an advantage highlighted below:
(1) voice communication assembly has adaptive ability to channel, by result that channel is estimated regulation messaging parameter and
Compress speech code check；
(2) using MBE voice compression algorithm, the decoded voice of receiving terminal is semantic clear, and tone color is natural；
(3) voice communication apparatus has the half-duplex underwater sound communication of voice and text both of which；
(4) computer can be used this device to be monitored and controls, it is simple to the system integration.
Accompanying drawing explanation
The structured flowchart of Fig. 1 embodiment of the present invention；
The voice signal figure of Fig. 2 input；
Fig. 3 AMBE3000 compress speech data frame format table；
Fig. 4 single-chip microcomputer and FPGA data packet communication form table；
Fig. 5 ofdm signal receiving terminal filter parameter allocation list；
The voice signal figure that Fig. 6 recovers after AMBE3000 decompresses.
Detailed description of the invention
Below in conjunction with the accompanying drawings embodiments of the present invention are described further:
As it is shown in figure 1, the underwater voice communication device of the embodiment of the present invention can be divided into following several module: voice collecting
Module, voice coding module, transmitting terminal speech control module, OFDM modulation module, underwater sound signal transmitter module, underwater sound signal connect
Receive module, OFDM demodulation module, receiving terminal speech control module, tone decoding module, voice playing module, channel estimation mould
Block；The block process realizing underwater voice communication function is: voice acquisition module adopts to obtain voice signal at mike, is passed
Transport to voice coding module, then by the transmitting voice signal after encoded to speech control module, then the signal after encryption is passed
Transport to OFDM modulation module, then launch underwater sound signal through underwater sound signal transmitter module；Received by underwater sound signal at receiving terminal
Module receives the underwater sound signal comprising voice messaging, transmits it to OFDM demodulation module, then transmits to speech control module,
Transmitting the signal after deciphering to tone decoding module, transmitting voice signal is to voice playing module the most at last again,
Speech play is realized by speaker；Channel estimation module, can export the estimated result to channel in real time, modulates mould to OFDM
Block, OFDM demodulation module, transmitting terminal and the speech control module of receiving terminal, be used for changing messaging parameter and compression bit rate；
The digital underwater voice communication device that the present invention relates to, is integrated with OFDM modulation technique and MBE voice coder simultaneously
Code technology.Different hardware platforms is utilized to realize from the algorithm of underwater sound communication the coding of voice signal.The coding of voice signal
Use special compress speech chip AMBE3000, coordinate and be controlled with single-chip microcomputer；In underwater sound communication processing platform, communication is calculated
Method uses DSP to realize, and coordinates and is controlled with Xilinx FPGA.
The digital underwater voice communication device that the present invention relates to can carry out voice and the half-duplex of text both of which
Underwater sound communication, by voice text handover module can realize the switching of two kinds of mode of operations.Voice text handover module, even
It is connected to the speech control module of transmitting terminal and receiving terminal, and utilizes serial ports to realize between textcommunication interface and speech control module
Connection.
Voice communication system supports voice and two kinds of communication patterns of text, first introduces the embodiment of voice communication.
(1) voice communication assembly has the function to channel self-adapting, channel estimation module complete.Channel estimation module
In, channel is estimated and resets suitable modulation parameter and coding parameter by DSP, coding parameter is sent to transmitting terminal simultaneously
Speech control module, controls code check with this；
(2) voice signal frequency of the mankind is at below 4KHz, so the analog voice to input is believed in voice acquisition module
Number carry out the low-pass filtering of 04KHz to 4KHz and 2～3 times of amplifications, the voice signal of input be content be the female voice of numeral 1～20
Signal, as in figure 2 it is shown, CODEC carries out sampling that sample frequency is 8KHz the precision with 16bit to the signal after filter and amplification
It is quantified as audio digital signals；
(3) digital signal after AD sample quantization is entered by the result that in voice coding module, AMBE3000 estimates according to channel
Row MBE compressed encoding, the voice rate scope after coding is 2.0～4.0kbps, and this compress speech code check is relatively applicable to underwater sound letter
The information transmission in road；
(4) single-chip microcomputer is used to be controlled, code check and the data of AMBE3000 as transmitting on Speech processing plate
End speech control module.Single-chip microcomputer passes through the PPT interface of AMBE3000 according to AMBE3000 data frame format by data after compression
Receiving and store, AMBE3000 data frame format is as shown in Figure 3.Receive after frame data complete, single-chip microcomputer will according to FPGA
Between data packet format be packet-by-packet sent to underwater sound communication processing platform, the data communication format between single-chip microcomputer and FPGA as figure
Shown in 4；
(5) modulation parameter obtained for realizing the OFDM modulation module of platform according to channel estimation module with DSP is to voice
Packet is encrypted to be modulated with OFDM；
(6) ofdm signal after modulation is exported by OFDM sending module by DA, and to carry out band connection frequency be 7～14KHz
Bandpass filtering and 2 times of amplifications, promote power amplifier and transmitting transducer to be sent to underwater acoustic channel by ofdm signal；
(7) the other side's voice device is sent to the ofdm signal inspection of underwater acoustic channel by the transducer that receives in OFDM receiver module
Survey, synchronize and receive, and carry out filter and amplification, be converted to differential signal and add bias voltage.Putting in OFDM receiver module
Big filtering uses OPA348 to realize, parameter configuration as it is shown in figure 5, analogue signal after treatment again by AD with frequency 48KHz
Sample, be quantified as the parallel digital signal of 18bit precision to next module；
(8) signal received is analyzed by channel estimation module, obtains the parameter now estimated channel；
(9) signal after AD is gathered by OFDM demodulation module according to analysis result is decrypted and demodulates, and by after demodulation
Data be sent to receiving terminal speech control module by serial ports；
(10) speech data after receiving terminal speech control module is demodulated by serial ports connects according to the form shown in Fig. 3
Receive, after having received a bag, be sent to AMBE3000 according to the data frame format shown in Fig. 3；
(11) tone decoding module is by PPT mouth by data receiver, is decoded speech data simultaneously；
(12) CODEC in voice playing module carries out DA conversion to decoded data, then by the voice letter of simulation
Number being exported by audio-frequence player device, the voice signal recovered in voice playing module is as shown in Figure 6.
Voice communication assembly can also carry out the textcommunication of more low bit-rate in addition to voice communications, and embodiment is as follows:
1) being switched to text communication mode by the knob on device panel, now channel estimation module can lead to for text
Channel is estimated by letter, required modulation parameter is reset equally；
2) upper computer softwares such as COM Debug Assistant are used to be sent to launch by extended serial port by data to be sent
End single-chip microcomputer speech control module, single-chip microcomputer will be transmitted after receiving data；
3) text data received is encrypted and modulates by the result that OFDM modulation module is estimated according to channel；
4) same OFDM sending module sends signal in underwater acoustic channel；
5) OFDM receiver module is amplified filtering to signal and AD converts；
6) channel estimation module signal to receiving carries out the analysis under text communication mode, obtains now estimating channel
The parameter of meter；
7) OFDM demodulation module is according to analysis result by decrypted signal, demodulation, and sends the data to single-chip microcomputer；
8) single-chip microcomputer uses the serial ports of extension the data received to be shown in the form of text.
Above-mentioned voice communication assembly have passed through substantial amounts of basin test and Lake trial, in Lake trial, voice communication
Distance is less than 5% more than 4km, the bit error rate, and the speech quality received in phonetic incepting termination is clear, and tone color is natural, and identification is relatively
Height, can tell different speakers.
Claims (2)
1. a digital underwater voice communication device, it is characterised in that: comprise voice acquisition module, voice coding module, send out
Penetrate end speech control module, OFDM modulation module, underwater sound signal transmitter module, underwater sound signal receiver module, OFDM demodulation module,
Receiving terminal speech control module, tone decoding module, voice playing module and channel estimation module；Voice acquisition module is from Mike
Adopt to obtain voice signal at wind, transmit it to voice coding module, then by the transmitting voice signal after encoded to transmitting terminal language
Sound control module, then the signal after encryption is transmitted to OFDM modulation module, then comprise through the transmitting of underwater sound signal transmitter module
The underwater sound signal of voice messaging；Received the underwater sound signal comprising voice messaging by underwater sound signal receiver module at receiving terminal,
Transmit it to OFDM demodulation module, then transmit to receiving terminal speech control module, then the signal after deciphering is transmitted to voice
Decoder module, transmitting voice signal is to voice playing module the most at last, realizes speech play by speaker；Channel
Estimation module, exports the estimated result to channel in real time to OFDM modulation module, OFDM demodulation module, transmitting terminal and receiving terminal
Speech control module, is used for changing messaging parameter and compression bit rate；
Also comprise voice text handover module, voice text handover module be connected to the Voice command mould of transmitting terminal and receiving terminal
Block, and utilize serial ports to realize the connection between textcommunication user interface and speech control module.
2. utilizing a underwater voice communication method for digital underwater voice communication device as claimed in claim 1, it is special
Levy and be to comprise the steps of:
(1) at voice transmission end, use voice acquisition module CODEC that the voice signal from Mike is sampled, be quantified as
Audio digital signals；
(2) at voice transmission end, it is compressed encoding to the audio digital signals that step (1) obtains with voice coding module；
(3) at voice transmission end, with speech control module, the speech data obtained in step (2) is encrypted；
(4) at voice transmission end, the signal that step (3) uses DSP, obtain according to channel estimation case carries out OFDM modulation,
And ofdm signal is amplified and filters, use power amplifier and transmitting transducer that acoustical signal is transmitted in underwater acoustic channel propagation；
(5) at phonetic incepting end, the result estimated according to channel, to receiving the ofdm signal of coming in underwater sound signal receiver module
It is filtered, amplifies, re-use AD and carry out sampling, quantifying；
(6) at phonetic incepting end, the signal obtaining step (5) is analyzed, and obtains the result parameter that channel is estimated；
(7) at phonetic incepting end, OFDM demodulation is carried out according to the parameter docking collection of letters number that step (6) obtains；
(8) at phonetic incepting end, the data obtaining step (7) are decrypted；
(9) at phonetic incepting end, use tone decoding module that the data obtained in step (8) are decompressed；
(10) at phonetic incepting end, use voice playing module CODEC that the data that step (9) obtains are carried out DA conversion, and lead to
Cross speaker and play output；
Also comprise the steps of:
1) being switched to text communication mode by the knob on device panel, channel is entered by channel estimation module for textcommunication
Row is estimated, modulation parameter is reset according to estimated result；
2) at text transmitting terminal, text message to be sent is sent to speech control module, Voice command mould by serial ports
Block is then forwarded to OFDM modulation module after receiving；
3) at text transmitting terminal, the result that OFDM modulation module is estimated according to channel the text data received is encrypted and
Modulation；
4) at text transmitting terminal, underwater sound signal sending module is sent to underwater acoustic channel by power amplifier and transducer after being amplified by signal
In；
5) at received text end, underwater sound signal receiver module is amplified filtering and AD conversion to receiving the underwater sound signal come；
6) at received text end, the signal received is analyzed by channel estimation module, obtains the result now estimated channel
Parameter；
7) at received text end, data by decrypted signal and demodulation, and are sent out by OFDM demodulation module according to the channel parameter estimated
Give speech control module；
8) at received text end, speech control module uses serial ports the data received to be shown in communication interface.
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Families Citing this family (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103714823B (en) * | 2013-12-19 | 2016-05-18 | 同济大学 | A kind of self adaptation subsurface communication method based on integrated voice coding |
| CN103701487B (en) * | 2014-01-14 | 2015-05-20 | 哈尔滨工业大学 | Underwater wireless power and signal transmission system based on dual-frequency point resonant cavity |
| CN103971695B (en) * | 2014-05-23 | 2017-03-01 | 厦门大学 | A kind of underwater digital voice communication system of channel self-adapting and its method |
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| CN106961639A (en) * | 2017-03-11 | 2017-07-18 | 苏州桑泰海洋仪器研发有限责任公司 | A kind of underwater communications system of interphone communication method under water and application this method |
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| CN107995567B (en) * | 2017-11-28 | 2019-08-02 | 中国人民解放军海军潜艇学院 | A kind of communication device for Underwater Engineering |
| CN108540227A (en) * | 2017-12-29 | 2018-09-14 | 井冈山大学 | A kind of electronic communication device |
| CN108880699A (en) * | 2018-07-06 | 2018-11-23 | 厦门大学 | A kind of underwater acoustic digital speed communication system and method under Quick moving platform |
| CN111028825A (en) * | 2020-01-09 | 2020-04-17 | 哈尔滨工程大学 | Underwater sound digital voice communication device and method based on offline voice recognition and synthesis |
| CN111976924A (en) * | 2020-08-12 | 2020-11-24 | 厦门大学 | Real-time information communication device for diving full mask |
| CN113078975A (en) * | 2021-03-30 | 2021-07-06 | 哈尔滨工程大学 | Full-duplex underwater acoustic communication self-interference signal channel modeling method |
| CN114520693B (en) * | 2022-04-20 | 2022-06-17 | 北京邮电大学 | Semantic optical communication system and method for text transmission |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101505291A (en) * | 2009-03-16 | 2009-08-12 | 哈尔滨工程大学 | Hydroacoustic communication differential decoding method based on OFDM coding |
| CN102034480A (en) * | 2010-12-16 | 2011-04-27 | 厦门大学 | Communication method of underwater digital voice |
| CN102404099A (en) * | 2011-11-25 | 2012-04-04 | 华南理工大学 | Underwater multi-user voice communication method and device capable of distributing frequency spectrum dynamically |
| CN103310793A (en) * | 2013-05-16 | 2013-09-18 | 厦门大学 | Water sound real-time digital speech communication method |
-
2013
- 2013-09-26 CN CN201310442083.5A patent/CN103457903B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101505291A (en) * | 2009-03-16 | 2009-08-12 | 哈尔滨工程大学 | Hydroacoustic communication differential decoding method based on OFDM coding |
| CN102034480A (en) * | 2010-12-16 | 2011-04-27 | 厦门大学 | Communication method of underwater digital voice |
| CN102404099A (en) * | 2011-11-25 | 2012-04-04 | 华南理工大学 | Underwater multi-user voice communication method and device capable of distributing frequency spectrum dynamically |
| CN103310793A (en) * | 2013-05-16 | 2013-09-18 | 厦门大学 | Water sound real-time digital speech communication method |
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