CN106788762A - The variable Repetition Frequency Laser modulator approach and system of voice signal character coding-control - Google Patents
The variable Repetition Frequency Laser modulator approach and system of voice signal character coding-control Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
- H04B10/505—Laser transmitters using external modulation
- H04B10/5059—Laser transmitters using external modulation using a feed-forward signal generated by analysing the optical or electrical input
- H04B10/50593—Laser transmitters using external modulation using a feed-forward signal generated by analysing the optical or electrical input to control the modulating signal amplitude including amplitude distortion
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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
- G10L15/00—Speech recognition
- G10L15/26—Speech to text systems
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- H—ELECTRICITY
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- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
- H04B10/505—Laser transmitters using external modulation
- H04B10/5057—Laser transmitters using external modulation using a feedback signal generated by analysing the optical output
- H04B10/50572—Laser transmitters using external modulation using a feedback signal generated by analysing the optical output to control the modulating signal amplitude including amplitude distortion
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/5162—Return-to-zero modulation schemes
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- H04B—TRANSMISSION
- H04B13/00—Transmission systems characterised by the medium used for transmission, not provided for in groups H04B3/00 - H04B11/00
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Abstract
The present invention discloses the variable Repetition Frequency Laser modulator approach and system of a kind of voice signal character coding-control, and voice signal identification gathers voice messaging with character processing module, and meaning of one's words feature recognition, similarity mode and characterization coding are carried out to voice messaging；Variable repetition coding module carries out sub-frame processing to voice messaging, and voice messaging character code point is inserted into the serial frame structure of different repetitions compositions；Pattern is changed and voice messaging is converted into NRZ from NRZ with laser driven module, and drives laser；Q-switched pulse laser is controlled by variable repetition Serial output pulse signal, and launches laser in ASK Laser Modulation modes.The present invention can reduce voice signal identification and digitized processing complex process, reduce bandwidth resources take, realize slow coding to obtain pulsed laser energy higher, with good confidentiality, real-time is high, communication link is simple the characteristics of.
Description
Technical field
The present invention relates to technical field of laser communication, it is adaptable to which air and underwater environment carry out the laser of voice signal
It is defeated, and in particular to the variable Repetition Frequency Laser modulator approach and system of a kind of voice signal character coding-control.
Background technology
With the development of optical communication technique, using light carrier the communication technology because its have quick response, electromagnetism interference,
Mobility is strong and the features such as reliability high, and carrying out data, the field such as dual-use of image transmitting has and extensively should
With.It is quickly to set up communication link under wartime (field) and particular surroundings (under water) environment, commander's control is carried out in time, leads to
It is maximally effective means to cross voice mode transmission command information, and it has high real-time and reliability.However, currently with
The mode of voice transfer is realized in light modulation, because the information of the voice signal for transmitting need to be compressed coding, thus technology realization
Mostly using complicated speech recognition and the digitized processing process of complexity, larger communications bandwidth resources are taken, so used
High power laser cannot ensure the real-time Transmission of voice messaging, make Laser Modulation energy and limited transmission distance.It can be seen that, it is existing
Laser Modulation realizes the requirement of voice transfer under the inadaptable military and particular surroundings of the mode of traditional voice Digital Transmission.
The content of the invention
To be solved by this invention is that the identification of voice signal present in existing Laser Modulation process and digitized processing are answered
The problems such as high-power Gao Zhongying transmitting miscellaneous, to laser cannot ensure with energy contradiction and information real-time Transmission, there is provided one
Plant the variable Repetition Frequency Laser modulator approach and system of voice signal character coding-control.
To solve the above problems, the present invention is achieved by the following technical solutions：
The variable Repetition Frequency Laser modulator approach of voice signal character coding-control, comprises the following steps：
Step 1, collection voice messaging, and meaning of one's words feature recognition, similarity mode and characterization volume are carried out to voice messaging
Code；
Step 2, sub-frame processing carried out to step 1 output voice messaging, and voice messaging character code point is inserted into not
Serial frame structure is constituted with repetition, to realize that the ASK to pulse laser is modulated；
Step 3, the voice messaging for exporting step 2 are converted to NRZ, and drive laser from NRZ；
Step 4, laser are controlled by variable repetition Serial output pulse signal, and launch sharp in ASK Laser Modulation modes
Light.
The detailed process of above-mentioned steps 1 is：
Step 1.1, the unspecified person voice messaging to gathering are identified pretreatment, and the meaning of one's words according to identification is converted to the Chinese
Language phonetic；
Step 1.2, by step 1.1 gained the Chinese phonetic alphabet with training template in the Chinese phonetic alphabet carry out similarity mode,
Matching result is searched into the Chinese character corresponding to the corresponding Chinese phonetic alphabet in sound bank；
Step 1.3, the character type that the Chinese character of step 1.2 gained is exported Transistor-Transistor Logic level according to ASCII codings with bytewise
Code, completes voice signal character, and the voice messaging Serial output that characterization is encoded.
In above-mentioned steps 1.3, according to byte code, its pattern is non return to zero TTL serial structures for each Chinese character and character
Form, using host computer as data command supplementary means, by character type data code Serial output.
In above-mentioned steps 2, every 8 binary codes of information character code constitute a frame with start bit and stop position；Often
The data length of one frame is 11, the start bit of wherein frame is 2, the data bit of frame be set to 8, the stop position of frame be 1.
In above-mentioned steps 2, the fundamental frequency at intervals of every frame of 2 leadings code of the start bit of frame is every by setting the fundamental frequency
Frame length is changed according to repetition requirement.
In above-mentioned steps 4, laser is triggered using rising edge.
Realize the variable Repetition Frequency Laser modulating system of the voice signal character coding-control of the above method, including voice letter
Number identification swashs with character processing module, variable repetition coding module, pattern conversion with laser driven module and Q impulse
Light device；
Voice signal recognize with character processing module complete speech signal collection, meaning of one's words feature recognition, similarity mode,
And characterization coding；
The symbol signal of characterization coding output is carried out sub-frame processing by variable repetition coding module, and by voice messaging word
Symbolization code point is inserted into different repetitions and constitutes serial frame structure, to realize that the ASK to pulse laser is modulated；
Pattern is changed and conversion of the laser driven module by variable repetition frame code element from NRZ to NRZ, and is passed through
Logic circuit drives Q-switched pulse laser；
Q-switched pulse laser is controlled by the variable repetition Serial output pulse letter of pattern conversion and laser driven module output
Number, and laser is launched in ASK Laser Modulation modes.
Compared with prior art, the present invention has following features：
1st, by speech recognition technology, voice signal is entered into line characterization treatment, simplifies the digitlization of traditional voice signal
Complex process, reduce baseband signal speed control, reduce communications bandwidth resources take, in the little field of information content transmission requirement
Close, it is ensured that certain laser output pulse energy, strengthen real-time, validity and the flexibility of laser communication.
2nd, by the real-time control of voice signal, laser emitter technologies are driven to be conducive to communication to believe using Weight variable frequency modulation system
The safety of breath, reduces technology and equipment complexity.
3rd, with good confidentiality, real-time is high, communication link is simple the characteristics of, air and submarine optical communication can be applied to
Category, has important value in target job control practical application under military battlefield commander and ocean water.
Brief description of the drawings
Fig. 1 is the variable Repetition Frequency Laser modulating system block diagram of Voice command.
Fig. 2 is voice signal character Principle of Process block diagram.
Fig. 3 is that speech recognition characterization processes software flow.
Fig. 4 is the command signal frame oscillogram of 3 repetitions.
Specific embodiment
Under for wartime (such as field) and particular surroundings (as under water), instruction type is transmitted by voice mode quick, simple
It is single, direct, but need to consider real-time, reliability and laser communication system in the logical of open channel signal transmission security
Letter feature, the present invention utilizes laser frequency hopping, loads on coding that different repetition frames constitute by voice messaging to control to swash
Light device is launched, it is ensured that certain pulsed laser energy, as long as communicating pair can be completed according to the laser frequency hopping communications agreement of agreement
Necessary laser radio voice information communication, the information security and confidentiality of communicating pair are that can obtain certain guarantee, are made out
Put the communication under channel circumstance and control technology more practicality.
Referring to Fig. 1, a kind of variable Repetition Frequency Laser modulating system of voice signal character coding-control is mainly believed by voice
Number identification swashs with character processing module, variable repetition coding module, pattern conversion with laser driven module and Q impulse
Light device is constituted.
Voice signal to be recognized and complete speech signal collection, pretreatment, similarity mode and word with character processing module
Symbolization treatment and code element output.Voice signal character coding module using LD3320 speech chips complete speech signal collection,
The output of pretreatment, similarity mode, character coding and result, according to byte code, its pattern is not for for each Chinese character and character
The TTL serial structure forms of zero, character type data code is input in variable repetition coding module.Voice signal character
Process is that the unspecified person voice messaging first to gathering is identified pretreatment, and the meaning of one's words according to identification is converted to the Chinese phonetic alphabet,
Then similarity mode is carried out with the Chinese phonetic alphabet in training template, matching result is searched into corresponding Chinese in sound bank and is spelled
Chinese character corresponding to sound, finally encodes result Chinese character according to ASCII the character type code that Transistor-Transistor Logic level is exported with bytewise,
Complete voice signal character.Character type coding, the coding are converted into after the voice signal of unspecified person is identified
Speed is relatively low, is suitable for driving high power laser, is conducive to obtaining laser firing pulses energy higher；This voice signal
Character conversion regime reduces the digitized complex process of traditional voice signal, reduces communications bandwidth resources and takes.Host computer
As the supplementary means that data command is transmitted.
Variable repetition coding module completes to carry out sub-frame processing to phonetic characters encoded signal, becomes according to certain repetition
Change rule and build serial transmission structure, to realize that the ASK to pulse laser is modulated.Variable repetition coding module is with single-chip microcomputer
Core, realizes the sub-frame processing of the voice messaging to characterization coding, and voice signal character code point is inserted into different repetitions
Constitute serial frame structure；It is 11 code lengths per frame, wherein 2 leading codes (its interval is determined per frame fundamental frequency), 8 characters
Data bit and 1 stop position, output pattern are non return to zero TTL serial structures form.Using the coding of variable repetition in communication
Structure, sub-frame processing is carried out to voice messaging according to certain repetition rule change, and output is adapted to drive high power laser string
Row code element, realizes the ASK modulation of laser；This frame structure is a kind of random length frame format, i.e. the frame length of signal transmission is variable,
Setting starts the pilot code that 2 is high level per frame, and its pulse spacing represents the repetition fundamental frequency of control laser, according between pulse
Every it is determined that symbol width and " 0 " and " 1 " code per frame, the data frame length constituted when fundamental frequency is different is also different.By can
Becoming the laser frequency-hopping method of frame length makes Laser emission output frequency change according to certain rule, reduces intercept probability, is conducive to protecting
Close communication.
Pattern is changed to be used to provide a kind of pattern of suitable driving laser with laser driven module, improves high power laser
Driving force, the serial voice frame pulse signal control Q-switched laser output laser of variable repetition of its output.Pattern conversion is used
Software completes conversion of the variable repetition frame code element from NRZ to NRZ, and improves laser drive using logic circuit output
Kinetic force, with the repetition pulse signal for obtaining being adapted to drive high-power pulsed laser.Laser is driven by exporting Transistor-Transistor Logic level
Device realizes ASK Laser Modulations.
Q-switched pulse laser completes the transmitting of voice laser signal.Nd:(rising edge is touched YAG Q impulses solid state laser
Hair) it is controlled by variable repetition Serial output pulse signal, change and the frame pulse pair of laser are launched in ASK Laser Modulation modes
Should.
Q-switched pulse laser is using the 1.06 mum wavelength infrared lasers for being adapted to propagation in atmosphere window, naked eyes vision in communication
None- identified, with certain disguise；The laser of simultaneous selection burst pulse output can improve instantaneous power, be conducive to obtaining
Larger pulsed laser energy.Real-time control high power laser is carried out using voice and realize communication modulation, it is adaptable to which air is believed
The wireless communication transmissions mode in road or extra large gas channel.
The variable Repetition Frequency Laser modulator approach of the voice signal character coding-control realized using said system, including
Following steps：
(1) speech recognition and character processing module are the sound of speaking that unspecified person is gathered by LD3320 voice modules
Instruction, then carries out meaning of one's words feature recognition, similarity mode and characterization coding (ASCII), by software by Chinese character and character
Encoded according to byte packet, serial data code (Transistor-Transistor Logic level) output to recognition result with speed less than 100bps to monolithic
Machine.Using host computer as data command supplementary means, output character type data code serially send single-chip microcomputer to process, shown in Fig. 2
It is character procedural block diagram, Fig. 3 realizes flow for software.
Voice signal character be by the Content Transformation of voice signal be available for computer recognize character or text.People
Conventional Chinese character have more than 6000, the corresponding Chinese phonetic alphabet of different Chinese characters can be identical, i.e. phonetically similar word, not have unisonance
The Chinese character of word totally 1268.Each Chinese character, letter and symbol correspond to an ASCII character for standard, people in computer system
When carrying out voice communication and exchanging, often and be not concerned with specific Chinese character, but go to judge the meaning of one's words according to the sound heard.
If the corresponding Chinese phonetic alphabet of voice is set up into a sound bank, then by speech recognition, the voice signal that will be read with
The Chinese phonetic alphabet in sound bank is matched, if the match is successful, obtains the Chinese phonetic alphabet corresponding to the Chinese character of voice, is completed
Identification process.After being identified result, phonetic is converted into Chinese character again, you can realize the character of voice signal, according to
Recognition result, can be by software design patterns, and the Chinese phonetic alphabet corresponding to result or Chinese character that will be obtained after identification carry out data
Transmission, now, completes the treatment of speech-to-text data/character.By the voice signal that characterization is processed, carried out
During Digital Transmission, comprising coded data substantially reduce, recover voice signal if desired in receiving terminal, it is only necessary to will receive
To binary code initial consonant corresponding with sound bank, simple or compound vowel of a Chinese syllable and tone carry out reduction synthesis, just can recover voice.Voice
Signal is directly digitized, then data rate is 64Kbit/s, and the later data rate of voice signal characterization is less than
100bps, therefore, voice signal character technology converts voice signals into the corresponding binary code of its Chinese phonetic alphabet, can
Extremely low data coding rate is realized, bandwidth resources have been saved.
(2) the character data that variable repetition coding module is sent to by the control of single chip circuit system to sound identification module
Enter row information sub-frame processing, by every 8 binary codes of phonetic code (corresponding to the ASCII of each Chinese character) and start bit and stopping
Position constitutes a frame, distributes a fundamental frequency per frame, and the data length of each frame is 11bit, the start bit of frame for 21 code elements (therebetween
Be divided into repetition frequency), data bit is set to 8bit, postamble with 11 code element be frame end mark, the symbol interval of 11bit data
Frequency used by the frame.Instruction code by after sub-frame processing, the data frame coding of the variable length of output send pattern change and
Drive circuit；2 pilot codes and variable interval set by every frame, make every frame length be changed according to repetition requirement.Base
Frequency number and frequency can be set in real time according to communicating requirement, and Fig. 4 waveforms provide a 3 fundamental frequency experimental paradigms, and " east longitude is sent in figure
18 north latitude 20 " are instructed, and MCU receives corresponding phonetic characters data 0xB6 0xAB 0xBE 0xAD 0x31 by serial ports
In inserting 10Hz, 15Hz, 20Hz fundamental frequency after 0x38 0xB1 0xB1 0xCE 0xB3 0x32 0x30 respectively, in figure by every frame before
Two code elements interval determines fundamental frequency, frequency from left to right be respectively 10Hz, 15Hz, 20Hz, 10Hz, 15Hz, 20Hz, 10Hz,
15Hz, 20Hz, 10Hz, 15Hz, 20Hz, there is frame period (more than maximum length code unit interval) more long between waveform display consecutive frame,
To recognize the data of next frame.
(3) code conversion is converted to the TTL non-return-to-zero codings that variable repetition coding module is sent to drive circuit module
It is suitable for driving high power laser return-to-zero coding, ASK modulation is carried out with to the laser that 1.06 mum wavelength rising edges are triggered.
The present invention can reduce the complex process of voice signal identification and digitized processing, reduce bandwidth resources and take, real
Existing slow coding to obtain pulsed laser energy higher, with good confidentiality, real-time is high, communication link is simple the characteristics of.
Claims (7)
1. the variable Repetition Frequency Laser modulator approach of voice signal character coding-control, it is characterized in that, comprise the following steps：
Step 1, collection voice messaging, and meaning of one's words feature recognition, similarity mode and characterization coding are carried out to voice messaging；
Step 2, sub-frame processing carried out to step 1 output voice messaging, and voice messaging character code point is inserted into different heavy
Frequency constitutes serial frame structure, to realize that the ASK to pulse laser is modulated；
Step 3, the voice messaging for exporting step 2 are converted to NRZ, and drive laser from NRZ；
Step 4, laser are controlled by variable repetition Serial output pulse signal, and launch laser in ASK Laser Modulation modes.
2. the variable Repetition Frequency Laser modulator approach of voice signal character coding-control according to claim 1, it is characterized in that,
The detailed process of step 1 is：
Step 1.1, the unspecified person voice messaging to gathering are identified pretreatment, and the meaning of one's words according to identification is converted to Chinese and spells
Sound；
Step 1.2, the Chinese phonetic alphabet of step 1.1 gained is carried out into similarity mode with the Chinese phonetic alphabet in training template, will
The Chinese character corresponding to the corresponding Chinese phonetic alphabet is searched in sound bank with result；
Step 1.3, the character type generation that the Chinese character of step 1.2 gained is exported Transistor-Transistor Logic level according to ASCI I codings with bytewise
Code, completes voice signal character, and the voice messaging Serial output that characterization is encoded.
3. the variable Repetition Frequency Laser modulator approach of voice signal character coding-control according to claim 2, it is characterized in that,
In step 1.3, according to byte code, its pattern is non return to zero TTL serial structures form, using upper for each Chinese character and character
Machine as data command supplementary means, by character type data code Serial output.
4. the variable Repetition Frequency Laser modulator approach of voice signal character coding-control according to claim 1, it is characterized in that,
In step 2, every 8 binary codes of information character code constitute a frame with start bit and stop position；The data of each frame are long
It is 11 to spend, the start bit of wherein frame is 2, the data bit of frame be set to 8, the stop position of frame be 1.
5. the variable Repetition Frequency Laser modulator approach of voice signal character coding-control according to claim 4, it is characterized in that,
In step 2, the fundamental frequency at intervals of every frame of 2 leadings code of the start bit of frame, by setting the fundamental frequency per frame length according to weight
Frequency requires to be changed.
6. the variable Repetition Frequency Laser modulator approach of voice signal character coding-control according to claim 4, it is characterized in that,
In step 4, laser is triggered using rising edge.
7. the variable Repetition Frequency Laser modulating system of the voice signal character coding-control of claim 1 methods described is realized, its
It is characterized in, including voice signal identification and character processing module, variable repetition coding module, pattern conversion and Laser Driven mould
Block and Q-switched pulse laser；
Voice signal recognize with character processing module complete speech signal collection, meaning of one's words feature recognition, similarity mode and
Characterization is encoded；
The symbol signal of characterization coding output is carried out sub-frame processing by variable repetition coding module, and by voice messaging character
Code point is inserted into different repetitions and constitutes serial frame structure, to realize that the ASK to pulse laser is modulated；
Pattern is changed and conversion of the laser driven module by variable repetition frame code element from NRZ to NRZ, and by logic
Circuit drives Q-switched pulse laser；
Q-switched pulse laser is controlled by the variable repetition Serial output pulse signal of pattern conversion and laser driven module output,
And laser is launched in ASK Laser Modulation modes.
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