CN103457903A - Digital underwater voice communication device and underwater voice communication method - Google Patents
Digital underwater voice communication device and underwater voice communication method Download PDFInfo
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Abstract
The invention discloses a digital underwater voice communication device and an underwater voice communication method. The problem of the information communication of underwater operation personnel is mainly solved. According to the device, different hardware platforms are used for achieving voice compression coding and underwater acoustic communication respectively, an OFDM modulation technique and an MBE voice compression technique are used in a combined mode, a channel estimation module carries out real-time estimation on a channel, the communication parameters and the compression code rate of the device can be changed for the channel in a self-adaption mode, and half-duplex underwater acoustic communication with a voice mode and a text mode is provided for a user. The device can be widely applied to various underwater operations, such as underwater archaeology, the communication of underwater vehicles, the communication of underwater operation personnel and a shore base and other fields, can achieve good underwater communication and has strong practicality.
Description
Technical field
The present invention relates to the subsurface communication field, particularly a kind of digital underwater voice communication device and underwater voice communication method that combines OFDM (OFDM) technology and the low code check voice compression technique of polygon band excitation (MBE).
Background technology
In recent years, development along with water sound communication technique, the digital underwater sound voice communication that combines voice compression technique is widely used in the military and civilian field, as seafari, communicating by letter etc. between archaeology, communication between the frogman, submarine or naval vessel and bank base control desk under water.Underwater sound voice communication technology has also experienced the evolution of analog to digital, and the analog-modulated stage in the early stage, underwater sound communication was often used the technology such as single-side band modulation in order to reduce bandwidth.The extensive use with the large scale integrated circuit technology that develops rapidly along with Digital Signal Processing, digital signal processor (DSP) with its efficient calculation ability and flexibly programming mode more and more be subject to developer's favor, voice communication is having entered and take the high-speed digital communication epoch that digital signal processor is core progressively also, compare to analogue system, digital vaccum tube voltmeter has embodied the superior function of being convenient to encrypt, be easy in the digitized processing such as integrated, miniaturization, channel matched be strong and mechanical dimension.
The deficiency and the difficult point that in the design of voice communication assembly, exist under water have: (1) will carry out in limited underwater acoustic channel in real time in bandwidth resources, continuously, compress speech and the underwater sound data communication of big data quantity, increased the difficulty that realizes of voice compression coding and underwater sound communication algorithm; (2) communication of algorithms and speech coding algorithm are embodied as same hardware platform, water sound communication technique is used DSP as implementation platform usually, and realizing that on DSP the communication of algorithms and speech coding algorithm can consume a large amount of resources simultaneously, the performance that also will sacrifice in case of necessity algorithm realizes whole function of voice communication; (3) underwater acoustic channel has Space Time-complex characteristics such as frequency change, will consider the adaptive capacity of the communication of algorithms to Complex Channel during design, does not have the underwater sound voice communication apparatus applied environment of adaptation function to limit to, and practicality is lower.
Summary of the invention
The object of the present invention is to provide a kind of subsurface communication more stable, the various information communication form can be provided, the better digital underwater speech communication device of communication of algorithms performance.The present invention also aims to provide a kind of underwater voice communication method.
The digital underwater voice communication device the present invention relates to has comprised voice acquisition module, speech coding module, transmitting terminal 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 adopted to obtain voice signal from microphone, transmit it to the speech coding module, again by the transmitting voice signal after encoded to the transmitting terminal speech control module, again the signal after encrypting is transferred to the OFDM modulation module, then the underwater sound signal that emission comprises voice messaging through the underwater sound signal transmitter module; Receive the underwater sound signal that comprises voice messaging by the underwater sound signal receiver module at receiving terminal, transmit it to the OFDM demodulation module, transfer to again the receiving terminal speech control module, again the signal after deciphering is transferred to the tone decoding module, after decoding, transmitting voice signal, to voice playing module, is realized speech play by loud speaker the most at last; Channel estimation module, in real time output is the speech control module to OFDM modulation module, OFDM demodulation module, transmitting terminal and receiving terminal to the estimated result of channel, make this device there is adaptive adjustment capability to channel, can change in real time messaging parameter and compression bit rate according to the estimated result to channel.
The digital underwater voice communication device the present invention relates to, simultaneously integrated OFDM modulation technique and MBE speech coding technology.Utilize different hardware platforms to realize the coding of voice signal and the algorithm of underwater sound communication.The coding of voice signal is used special-purpose compress speech chip AMBE3000, coordinates and is controlled with single-chip microcomputer; The communication of algorithms in underwater sound communication is used DSP to realize, coordinates and is controlled with Xilinx FPGA.
The digital underwater voice communication device the present invention relates to can carry out the half-duplex underwater sound communication of voice and two kinds of patterns of text, by voice the text handover module can realize the switching of two kinds of mode of operations.Voice the text handover module be connected in the speech control module of transmitting terminal and receiving terminal, and utilize serial ports to realize being connected between textcommunication interface and speech control module.
A kind of voice communication method that utilizes digital underwater voice communication device of the present invention, comprise the steps:
(1) at the voice transmission end, use CODEC to be sampled to the voice signal from Mike, be quantified as audio digital signals;
(2), at the voice transmission end, audio digital signals step (1) obtained with the voice coding module carries out compressed encoding;
(3), at the voice transmission end, with the transmitting terminal speech control module, the speech data obtained in step (2) is encrypted;
(4) at the voice transmission end, the signal that use DSP, according to channel estimation case, step (3) is obtained carries out the OFDM modulation, and ofdm signal is amplified and filtering, uses power amplifier and transmitting transducer that acoustical signal is transmitted in underwater acoustic channel and propagates;
(5) at the phonetic incepting end, according to the result of channel estimating, in the underwater sound signal receiver module, to receiving the ofdm signal come, carry out filtering, amplification, re-use AD and sampled, quantize;
(6), at the phonetic incepting end, the signal that step (5) is obtained is analyzed, and obtains the result parameter of channel estimating;
(7), at the phonetic incepting end, the parameter obtained according to step (6) is carried out the OFDM demodulation to received signal;
(8), at the phonetic incepting end, the data that step (7) is obtained are decrypted;
(9), at the phonetic incepting end, use the tone decoding module to be decompressed to the data that obtain in step (8);
(10) at the phonetic incepting end, the data of using CODEC that step (9) is obtained are carried out the DA conversion, and play the output voice by loud speaker.
A kind of textcommunication method of utilizing digital underwater voice communication device of the present invention, comprise the steps:
1) be switched to text communication mode by the knob on the device panel, channel estimation module is estimated channel for textcommunication, according to estimated result, modulation parameter is reset;
2) at the text transmitting terminal, the text message that send is sent to the transmitting terminal speech control module by serial ports, after receiving, the transmitting terminal speech control module sends to again the OFDM modulation module;
3), at the text transmitting terminal, the OFDM modulation module is encrypted the text data received and modulate according to the result of channel estimating;
4), at the text transmitting terminal, the underwater sound signal sending module sends in underwater acoustic channel by power amplifier and transducer after signal is amplified;
5), at the text receiving terminal, the underwater sound signal receiver module carries out amplification filtering and AD conversion to receiving the underwater sound signal of coming;
6) at the text receiving terminal, channel estimation module is analyzed the signal received, and obtains now the result parameter to channel estimating;
7), at the text receiving terminal, the OFDM demodulation module by decrypted signal and demodulation, and sends the data to the receiving terminal speech control module according to the channel parameter of estimating;
8), at the text receiving terminal, the receiving terminal speech control module is used serial ports that the data of receiving are shown in communication interface.
The present invention has advantages of following outstanding:
(1) voice communication assembly has adaptive ability to channel, by the result to channel estimating, regulates messaging parameter and compress speech code check;
(2) adopt the MBE voice compression algorithm, the decoded voice semanteme of receiving terminal is clear, the tone color nature;
(3) voice communication apparatus has the half-duplex underwater sound communication of voice and two kinds of patterns of text;
(4) can use computer to be monitored and control this device, be convenient to the system integration.
The 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 shfft;
Fig. 5 ofdm signal receiving terminal filter parameter allocation list;
The voice signal figure that Fig. 6 recovers after AMBE3000 decompresses.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the present invention are described further:
As shown in Figure 1, the underwater voice communication device of the embodiment of the present invention can be divided into following several module: voice acquisition module, speech coding module, transmitting terminal 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, channel estimation module; The module flow process that realizes the underwater voice communication function is: voice acquisition module is adopted to obtain voice signal from microphone, transmit it to the speech coding module, again by the transmitting voice signal after encoded to speech control module, again the signal after encrypting is transferred to the OFDM modulation module, then through underwater sound signal transmitter module emission underwater sound signal; Receive the underwater sound signal that comprises voice messaging by the underwater sound signal receiver module at receiving terminal, transmit it to the OFDM demodulation module, transfer to again speech control module, again the signal after deciphering is transferred to the tone decoding module, after decoding, transmitting voice signal, to voice playing module, is realized speech play by loud speaker the most at last; Channel estimation module, can export the estimated result to channel in real time, to the speech control module of OFDM modulation module, OFDM demodulation module, transmitting terminal and receiving terminal, for changing messaging parameter and compression bit rate;
The digital underwater voice communication device the present invention relates to, simultaneously integrated OFDM modulation technique and MBE speech coding technology.Utilize different hardware platforms to realize the coding of voice signal and the algorithm of underwater sound communication.The coding of voice signal is used special-purpose compress speech chip AMBE3000, coordinates and is controlled with single-chip microcomputer; In underwater sound communication processing platform, the communication of algorithms is used DSP to realize, coordinates and is controlled with Xilinx FPGA.
The digital underwater voice communication device the present invention relates to can carry out the half-duplex underwater sound communication of voice and two kinds of patterns of text, by voice the text handover module can realize the switching of two kinds of mode of operations.Voice the text handover module, be connected in the speech control module of transmitting terminal and receiving terminal, and utilize serial ports to realize being connected between textcommunication interface and speech control module.
Two kinds of communication patterns of voice communication system support voice and text, the execution mode of paper voice communication.
(1) voice communication assembly has the function to channel self-adapting, by channel estimation module, is completed.In channel estimation module, DSP is estimated channel and reset suitable modulation parameter and coding parameter, coding parameter is sent to the transmitting terminal speech control module simultaneously, with this, controls code check;
(2) mankind's voice signal frequency is below 4KHz, so in voice acquisition module, low-pass filtering and 2～3 times amplifications of 04KHz to 4KHz are carried out in the analog voice signal of input, the voice signal of input is the female voice signal that content is numeral 1～20, as shown in Figure 2, to carry out the sampling that sample frequency is 8KHz and take the accuracy quantification of 16bit be audio digital signals to the signal of CODEC after to filter and amplification;
(3) in the speech coding module AMBE3000 according to the result of channel estimating the digital signal after to the AD sample quantization carry out the MBE compressed encoding, voice rate scope after coding is 2.0～4.0kbps, and this compress speech code check is applicable to the communication of underwater acoustic channel;
(4) on the voice signal disposable plates, use single-chip microcomputer to be controlled code check and the data of AMBE3000, as the transmitting terminal speech control module.Single-chip microcomputer will compress rear data receiver storage by the PPT interface of AMBE3000 according to the AMBE3000 data frame format, and the AMBE3000 data frame format as shown in Figure 3.After receiving frame data and completing, single-chip microcomputer will according to and FPGA between data packet format packet-by-packet send to underwater sound communication processing platform, the data communication format between single-chip microcomputer and FPGA is as shown in Figure 4;
(5) take the modulation parameter that OFDM modulation module that DSP is implementation platform obtains according to channel estimation module is encrypted with OFDM and modulates VoP;
(6) the OFDM sending module is exported the ofdm signal after modulation by DA, and bandpass filtering and the 2 times of amplifications that to work with frequency be 7～14KHz of going forward side by side promote power amplifier and transmitting transducer ofdm signal is sent in underwater acoustic channel;
(7) ofdm signal that the receiving transducer in the OFDM receiver module is sent to underwater acoustic channel by the other side's voice device detects, synchronous and reception, and carries out filter and amplification, is converted to differential signal and adds bias voltage.Amplification filtering in the OFDM receiver module is used OPA348 to realize, parameter configuration as shown in Figure 5, sampled with frequency 48KHz by AD again by analog signal after treatment, is quantified as the parallel digital signal of 18bit precision to next module;
(8) channel estimation module is analyzed to the received signal, obtains now the parameter to channel estimating;
(9) signal of OFDM demodulation module after according to analysis result, AD being gathered is decrypted and demodulation, and the data after demodulation are sent to the receiving terminal speech control module by serial ports;
(10) speech data of receiving terminal speech control module after by the serial ports demodulation received according to the form shown in Fig. 3, sends to AMBE3000 according to the data frame format shown in Fig. 3 after receiving a bag;
(11) the tone decoding module, is decoded to speech data data receiver by the PPT mouth simultaneously;
(12) CODEC in voice playing module carries out the DA conversion to decoded data, then the voice signal of simulation is exported by audio-frequence player device, and the voice signal recovered in voice playing module as shown in Figure 6.
Voice communication assembly can also carry out the textcommunication of lower code check except voice communication, and execution mode is as follows:
1) be switched to text communication mode by the knob on the device panel, now channel estimation module can be estimated channel for textcommunication, equally required modulation parameter is reset;
2) use the upper computer software such as COM Debug Assistant that the data that will send are sent to transmitting terminal single-chip microcomputer speech control module by extended serial port, single-chip microcomputer will be sent after receiving data;
3) the OFDM modulation module is encrypted the text data received and modulate according to the result of channel estimating;
4) same OFDM sending module sends signal in underwater acoustic channel;
5) the OFDM receiver module carries out amplification filtering and AD conversion to signal;
6) channel estimation module carries out the analysis under text communication mode to the received signal, obtains now the parameter to channel estimating;
7) the OFDM demodulation module by decrypted signal, demodulation, and sends the data to single-chip microcomputer according to analysis result;
8) single-chip microcomputer uses the serial ports of expansion that the data of receiving are shown with textual form.
Above-mentioned voice communication assembly has passed through a large amount of basin tests and Lake trial, and in Lake trial, the voice communication distance is greater than 4km, the error rate is less than 5%, and the speech quality of receiving in the phonetic incepting termination is clear, the tone color nature, identification is higher, can tell different speakers.
Claims (4)
1. a digital underwater voice communication device, is characterized in that: comprise voice acquisition module, speech coding module, transmitting terminal 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 adopted to obtain voice signal from microphone, transmit it to the speech coding module, again by the transmitting voice signal after encoded to the transmitting terminal speech control module, again the signal after encrypting is transferred to the OFDM modulation module, then the underwater sound signal that emission comprises voice messaging through the underwater sound signal transmitter module; Receive the underwater sound signal that comprises voice messaging by the underwater sound signal receiver module at receiving terminal, transmit it to the OFDM demodulation module, transfer to again the receiving terminal speech control module, again the signal after deciphering is transferred to the tone decoding module, after decoding, transmitting voice signal, to voice playing module, is realized speech play by loud speaker the most at last; Channel estimation module, in real time output is the speech control module to OFDM modulation module, OFDM demodulation module, transmitting terminal and receiving terminal to the estimated result of channel, for changing messaging parameter and compression bit rate.
2. digital underwater voice communication device as claimed in claim 1, it is characterized in that: also comprise voice the text handover module, voice the text handover module be connected in the speech control module of transmitting terminal and receiving terminal, and utilize serial ports to realize being connected between textcommunication user interface and speech control module.
3. a underwater voice communication method that utilizes digital underwater voice communication device as claimed in claim 1 is characterized in that comprising following steps:
(1) at the voice transmission end, use CODEC to be sampled to the voice signal from Mike, be quantified as audio digital signals;
(2), at the voice transmission end, audio digital signals step (1) obtained with the voice coding module carries out compressed encoding;
(3), at the voice transmission end, with speech control module, the speech data obtained in step (2) is encrypted;
(4) at the voice transmission end, the signal that use DSP, according to channel estimation case, step (3) is obtained carries out the OFDM modulation, and ofdm signal is amplified and filtering, uses power amplifier and transmitting transducer that acoustical signal is transmitted in underwater acoustic channel and propagates;
(5) at the phonetic incepting end, according to the result of channel estimating, in the underwater sound signal receiver module, to receiving the ofdm signal come, carry out filtering, amplification, re-use AD and sampled, quantize;
(6), at the phonetic incepting end, the signal that step (5) is obtained is analyzed, and obtains the result parameter of channel estimating;
(7), at the phonetic incepting end, the parameter obtained according to step (6) is carried out the OFDM demodulation to received signal;
(8), at the phonetic incepting end, the data that step (7) is obtained are decrypted;
(9), at the phonetic incepting end, use the tone decoding module to be decompressed to the data that obtain in step (8);
(10), at the phonetic incepting end, the data of using CODEC that step (9) is obtained are carried out the DA conversion, and play output by loud speaker.
4. underwater voice communication method according to claim 3 is characterized in that comprising following steps:
1) be switched to text communication mode by the knob on the device panel, channel estimation module is estimated channel for textcommunication, according to estimated result, modulation parameter is reset;
2) at the text transmitting terminal, the text message that send is sent to speech control module by serial ports, after receiving, speech control module sends to again the OFDM modulation module;
3), at the text transmitting terminal, the OFDM modulation module is encrypted the text data received and modulate according to the result of channel estimating;
4), at the text transmitting terminal, the underwater sound signal sending module sends in underwater acoustic channel by power amplifier and transducer after signal is amplified;
5), at the text receiving terminal, the underwater sound signal receiver module carries out amplification filtering and AD conversion to receiving the underwater sound signal of coming;
6) at the text receiving terminal, channel estimation module is analyzed the signal received, and obtains now the result parameter to channel estimating;
7), at the text receiving terminal, the OFDM demodulation module by decrypted signal and demodulation, and sends the data to speech control module according to the channel parameter of estimating;
8), at the text receiving terminal, speech control module is used serial ports that the data of receiving are shown in communication interface.
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| CN114520693A (en) * | 2022-04-20 | 2022-05-20 | 北京邮电大学 | Semantic optical communication system and method for text transmission |
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