CN110503966A - MELP/CELP mixing voice navamander and coding method based on rail - Google Patents
MELP/CELP mixing voice navamander and coding method based on rail Download PDFInfo
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Abstract
The invention discloses a kind of MELP/CELP mixing voice navamander and communication means based on rail, MELP/CELP mixed encoding and decoding and rail channel are combined together by the present invention, low rate mixing voice encoding scheme is applied in rail voice communication system, the big defect that solves that transmitting terminal existing for the system is asynchronous with destination time phase, rail communication channel capacity is small, voice signal rail transmission is decayed, it for above three main technical problems, adopts the technical scheme that: traditional MELP being encoded, time phase alignment algorithm is added；It is appropriate to reduce MELP vocoder frames；High-frequency carrier wave is generated using 2FSK modulator, generates high-frequency mechanical oscillation carrier wave using energy converter.The present invention can enhance rail voice signal encoding-decoding efficiency, improve the channel capacity of rail channel, improve the stability of rail voice communication system, enhance the voice communication quality of rail communication system.
Description
Technical field
The present invention relates to a kind of communication system and method more particularly to a kind of MELP/ based on rail based on rail
CELP mixing voice navamander and coding method.
Background technique
The rail in enclosure space that rail communication system is formed using some disasters is communicated as channel, realizes calamity
Emergency communication after evil generation.MELP/CELP low rate mixing voice encoding scheme is applied in rail voice communication, is invented
A kind of MELP/CELP low rate mixing voice navamander based on rail, can be effectively reduced the voice coding time, mentions
High voice encoding efficiency guarantees rail quality of voice transmission.
But due to the unstability of rail channel ambient enviroment and the particularity of rail channel, by MELP/CELP low speed
After rate mixing voice encoding scheme is applied to rail communication system, it will generate some actual application problems.
Main problem has: (1) rail channel transmitting terminal is asynchronous with destination time phase, leads to receiving end voice also
Originate in raw error；(2) rail communication channel channel capacity itself is small, and the coded voice signal disposably transmitted is few, it is difficult to meet
The demand of emergency communication；(3) because channel medium and transmission range cause voice signal decaying big farther out, it may appear that fall frame, lose
The case where mistake.
In order to solve the above problem encountered in a particular application and the preferably envelope that is formed in disaster using rail
It closes and carries out voice communication in space, original Low Bit-Rate Speech Coding scheme is correspondingly improved and is innovated, apply
In rail communication system, a kind of MELP/CELP low rate mixing voice encoded communication method based on rail has been invented, thus
The quality for guaranteeing rail voice communication system, enhances the stability of system.
Summary of the invention
It solves the above problems the object of the invention is that providing one kind, can effectively improve rail communication channel channel itself
Capacity is small, voice signal decaying is big, it may appear that the MELP/CELP low rate based on rail the defects of the case where falling frame, losing
Mixing voice encoded communication method.
To achieve the goals above, the technical solution adopted by the present invention is that such: a kind of MELP/CELP based on rail
Mixing voice navamander, including MELP/CELP hybrid coder and MELP/CELP hybrid decoder, MELP/CELP are mixed
It closes and is also successively arranged 2FSK modulator, first transducer, rail channel, second between encoder and MELP/CELP hybrid decoder
Energy converter and 2FSK demodulator；
The MELP/CELP hybrid coder is used to for primary speech signal to be divided into speech frame and draw, by speech frame by strong
Voiced sound, weak voiced sound and unvoiced classification, and hybrid coding speech frame is formed to MELP/CELP hybrid coding is carried out with speech frame；
MELP/CELP hybrid decoder is used to be decoded the hybrid coding speech frame received and synthetic filtering, defeated
Synthetic speech signal out；
The 2FSK modulator is used to carry out signal modulation to hybrid coding speech frame, forms analog electrical signal；
The 2FSK demodulator forms hybrid coding speech frame for demodulating to analog electrical signal；
The first transducer is used to be converted to analog electrical signal vibration simulation signal, and the rail channel is for vibrating
The transmission of analog signal, the second transducer are used to vibration simulation signal being converted to analog electrical signal.
As preferred: the MELP/CELP hybrid coder includes MELP coding module and CELP coding module, MELP/
CELP hybrid decoder includes MELP decoder module and CELP decoder module, the MELP coding module and MELP decoder module,
CELP coding module selects digital signal processing chip, and CELP decoder module selects digital signal processing chip C64x series；
2FSK modulator, 2FSK demodulator select dsp chip.
A kind of communication means of the MELP/CELP mixing voice navamander based on rail: the following steps are included:
(1) a MELP/CELP mixing voice coded system based on rail is established；
(2) primary speech signal that choosing need to transmit is input in MELP/CELP hybrid coder, in regular intervals
It is divided into speech frame, then speech frame will be pressed strong voiced sound, weak voiced sound and unvoiced classification；
(3) MELP/CELP hybrid coder identifies speech frame, if speech frame is strong voiced sound, is encoded using MELP,
It if weak voiced sound and voiceless sound, is encoded using CELP, the data after coding form hybrid coding speech frame；
(4) hybrid coding speech frame adds the 1bit for indicating that the hybrid coding of speech frame is MELP coding or CELP coding
Output is packaged behind mode adjudging position to 2FSK modulator；
(5) hybrid coding speech frame carries out analog signal modulation through 2FSK modulator, forms analog electrical signal；
(6) analog electrical signal is converted to vibration simulation signal in first transducer, is loaded onto rail channel and is passed
It is defeated；
(7) vibration simulation signal is converted to analog electrical signal through second transducer after rail transmission again, then passes through
The demodulation of 2FSK demodulator, obtains hybrid coding speech frame, is sent into MELP/CELP hybrid decoder；
(8) MELP/CELP hybrid decoder makes decisions according to the decision bit of hybrid coding speech frame, encodes if MELP
Mode is then decoded using MELP, if CELP coding mode, then uses CELP decoding process, the signal economic cooperation obtained after decoding
At generating reconstructed speech signal after filtering.
As preferred: in step (2), Fixed Time Interval 20ms.
As preferred: MELP voice coding includes the fourier spectra amplitude frame for characterizing raw tone spectrum intensity, step (3)
When middle progress MELP coding, remove fourier spectra amplitude frame, the output result of hybrid coder is made to reduce by 22 bits.
As preferred: the 2FSK modulator and 2FSK demodulator generate the sinusoidal carrier signal of 1600HZ, 3200HZ,
The carrier wave of data 0 and 1 is respectively represented, 2FSK modulator carrier wave is generated using iterative method, and the demodulation of 2FSK demodulator is examined using difference
Wave method；The first transducer generates the mechanical oscillation signal of 3200HZ.
As preferred: in MELP/CELP hybrid coder, MELP coding uses phase alignment method.
Compared with the prior art, the advantages of the present invention are as follows:
(1) MELP coding uses phase alignment in low rate mixing voice encoder, and it is different from decoding clock to solve coding
The problem of step, effectively reduces the error when decoding of system voice encoded signal, improves the quality of synthesis voice, improves system language
The accuracy of sound signal transmission；
(2) traditional MELP speech coding algorithm is improved, reduces vocoded data memory space, effectively improves letter
Road capacity enhances rail channel communication ability；
(3) using 2FSK modulation and demodulation method and using energy converter, raw tone encoded signal is loaded into high-frequency and is carried
The transmission of physical channel is carried out on wave, more preferable match channels characteristic effectively reduces the decaying and distortion of transmission signal；
(4) by the way of mixed low speed rate voice coding, different low-bit-rate speech codings is taken to compile different speech frames
Code mode, reduces speech encoding rate, improves voice encoding efficiency, improves the reliability of coding, guarantees rail communication system
Job stability；
(5) system design principle is simple, it is easy to accomplish and operation.
Detailed description of the invention
Fig. 1 is circuit diagram of the present invention；
Fig. 2 is MELP/CELP hybrid coder coding principle figure；
Fig. 3 is MELP/CELP hybrid decoder decoding principle figure.
Specific embodiment
The present invention will be further described with reference to the accompanying drawings.
Embodiment 1: referring to Fig. 1 to Fig. 3, a kind of MELP/CELP mixing voice navamander based on rail, including
MELP/CELP hybrid coder and MELP/CELP hybrid decoder, MELP/CELP hybrid coder and MELP/CELP mixing solution
2FSK modulator, first transducer, rail channel, second transducer and 2FSK demodulator are also successively arranged between code device；
The MELP/CELP hybrid coder is used to for primary speech signal to be divided into speech frame and draw, by speech frame by strong
Voiced sound, weak voiced sound and unvoiced classification, and hybrid coding speech frame is formed to MELP/CELP hybrid coding is carried out with speech frame；
MELP/CELP hybrid decoder is used to be decoded the hybrid coding speech frame received and synthetic filtering, defeated
Synthetic speech signal out；
The 2FSK modulator is used to carry out signal modulation to hybrid coding speech frame, forms analog electrical signal；
The 2FSK demodulator forms hybrid coding speech frame for demodulating to analog electrical signal；
The first transducer is used to be converted to analog electrical signal vibration simulation signal, and the rail channel is for vibrating
The transmission of analog signal, the second transducer are used to vibration simulation signal being converted to analog electrical signal.
The MELP/CELP hybrid coder includes MELP coding module and CELP coding module, MELP/CELP mixing solution
Code device includes MELP decoder module and CELP decoder module, and the MELP coding module and MELP decoder module, CELP encode mould
Block selects digital signal processing chip, and CELP decoder module selects digital signal processing chip C64x series；2FSK modulator,
2FSK demodulator selects dsp chip.
A kind of communication means of the MELP/CELP mixing voice navamander based on rail, comprising the following steps:
(1) a MELP/CELP mixing voice coded system based on rail is established；
(2) primary speech signal that choosing need to transmit is input in MELP/CELP hybrid coder, in regular intervals
It is divided into speech frame, then speech frame will be pressed strong voiced sound, weak voiced sound and unvoiced classification；Here we are arranged Fixed Time Interval and are
20ms；
(3) MELP/CELP hybrid coder identifies speech frame, if speech frame is strong voiced sound, is encoded using MELP,
It if weak voiced sound and voiceless sound, is encoded using CELP, the data after coding form hybrid coding speech frame；
(4) hybrid coding speech frame adds the 1bit for indicating that the hybrid coding of speech frame is MELP coding or CELP coding
Output is packaged behind mode adjudging position to 2FSK modulator；
(5) hybrid coding speech frame carries out analog signal modulation through 2FSK modulator, forms analog electrical signal；
(6) analog electrical signal is converted to vibration simulation signal in first transducer, is loaded onto rail channel and is passed
It is defeated；
(7) vibration simulation signal is converted to analog electrical signal through second transducer after rail transmission again, then passes through
The demodulation of 2FSK demodulator, obtains hybrid coding speech frame, is sent into MELP/CELP hybrid decoder；
(8) MELP/CELP hybrid decoder makes decisions according to the decision bit of hybrid coding speech frame, encodes if MELP
Mode is then decoded using MELP, if CELP coding mode, then uses CELP decoding process, the signal economic cooperation obtained after decoding
At generating reconstructed speech signal after filtering.
In the present embodiment: MELP voice coding includes the fourier spectra amplitude frame for characterizing raw tone spectrum intensity, step
(3) when carrying out MELP coding in, remove fourier spectra amplitude frame, the output result of hybrid coder is made to reduce by 22 bits.
The 2FSK modulator and 2FSK demodulator generate the sinusoidal carrier signal of 1600HZ, 3200HZ, respectively represent
The carrier wave of data 0 and 1,2FSK modulator carrier wave are generated using iterative method, and the demodulation of 2FSK demodulator uses differential detection method；Institute
State the mechanical oscillation signal that first transducer generates 3200HZ.
In MELP/CELP hybrid coder, MELP coding uses phase alignment method
Embodiment 2: referring to Fig. 1 to Fig. 3, scheme in order to better illustrate the present invention, we on the basis of embodiment 1,
MELP/CELP mixing voice navamander based on rail is divided into transmitting terminal, transmission medium, receiving end.
Transmitting terminal includes: MELP/CELP hybrid coder, 2FSK modulator, first transducer；
Transmission medium are as follows: rail channel；
Receiving end includes: second transducer, 2FSK demodulator, MELP/CELP hybrid decoder.
Workflow of the present invention are as follows: primary speech signal is introduced into transmitting terminal, through MELP/CELP hybrid coder to language
After sound frame classification, the output of hybrid coding speech frame is formed, then passes through 2FSK modulator and first transducer for hybrid coding voice
Frame is loaded into rail channel in the form of high-frequency mechanical vibration wave；It is transmitted to receiving end.
Signal on receiving end, rail channel converts analog signals into electric signal through second transducer, then carries out
2FSK demodulation, the formation hybrid coding speech frame that demodulation obtains is input in MELP/CELP hybrid decoder, according to decision bit
Suitable decoding process is selected, the synthesis driving source for then obtaining decoding generates reconstruct by linear prediction synthesis filter
Voice signal, finally again by voice signal postfilter, output obtains synthetic speech signal, completes entire hybrid coding language
The decoding process of sound frame.
Wherein, first, about structure:
MELP/CELP hybrid coder includes MELP coding module and CELP coding module, MELP/CELP hybrid decoder
Including MELP decoder module and CELP decoder module.For the convenience of description, we are by MELP coding module and MELP decoder module
Merge and be known as MELP codec, CELP coding module and CELP decoder module are merged and are known as CELP codec.
MELP codec includes DSP main control module, analog interface module, FLASH memory module and clock module；
DSP main control unit completes the key algorithm in encoding and decoding speech, such as phase alignment algorithm, and controls the defeated of encoding and decoding speech
Enter and exports；Analog interface module completion input amplification, anti-aliasing filter, A/D, D/A, low pass smothing filtering, output power push away
The functions such as dynamic；FLASH stores program and data, and the RAM for code to be directed into DSP is run, to form autonomous system；Clock
Module provides clock signal for whole system operation.
Phase alignment algorithm be in order to solve the problems, such as that encoding and decoding speech both ends time phase is nonsynchronous, using correlation method come
The phase parameter for extracting strong unvoiced frame carries out phase calculation according to extracted parameter, is added and calculates in MELP voice coding
Obtained alignment phase simultaneously encodes it, guarantees raw tone and synthesizes the time synchronization of voice.
The digital signal processing chip that CELP coding module uses includes that DSP, ARM two subsystems and multimedia compile solution
Code device, Application Programming Interface API etc..
The second, about decoding method:
MELP/CELP hybrid coder coding principle referring to fig. 2, first mixes primary speech signal feeding MELP/CELP
It closes in encoder, is pre-processed by voice, primary speech signal is divided into speech frame according to the time interval of 20ms.At this point, right
Speech frame processing specifically:
(1) each speech frame after pretreatment divides is referred to according to pitch period and voiced sound intensity
Under the classification of strong voiced sound, weak voiced sound and voiceless sound；Speech frame is identified again, if being identified as strong voiced sound, MELP is used to it
Encoding scheme, it is on the contrary then use CELP encoding scheme；
(2) due to being to divide speech frame, the sampling being equivalent in voice coding, so the speech information content of raw tone
It can lose.So first with linear prediction analysis before carrying out MELP, CELP coding respectively to different classes of speech frame
Prediction estimation is carried out to the speech frame of division, predicts the speech frame of loss as far as possible, to guarantee the content of raw tone, matter
Amount；
(3) it is encoded respectively for speech frame, forms hybrid coding speech frame, wherein in MELP coding, using phase
Position alignment algorithm, and remove fourier spectra amplitude frame in MELP voice coding, shorten the code length after voice coding as far as possible；
(4)) hybrid coding speech frame is packaged output after adding decision bit.
MELP/CELP hybrid decoder decoding principle is referring to Fig. 3, when through rail signal, second transducer, 2FSK demodulator
Hybrid coding speech frame after demodulation, when being input in MELP/CELP hybrid decoder, decoder is first according to hybrid coding language
Last decision bit judgement of sound frame is MELP coding mode or CELP coding mode, and suitable decoding algorithm is selected to carry out
Decoding, then the signal that decoding is obtained carry out linear prediction synthesis by low-pass filter filtering, composite filter, generate reconstruct
Voice signal.Generally finally, we can pass through a voice signal postfilter again, output obtains synthetic speech signal.
Third, about 2FSK modulation /demodulation:
The key of the 2FSK modulation is to generate sine wave carrier signal, Binary Frequency Shift Keying tune used by this system
Demodulation scheme material object basic principle processed is that the variation of high frequent carrier frequency is controlled with digital baseband signal, makes carrier frequency in f1
Change between f2, the superposition of two different binary system amplitude-shift keying signals can be regarded as, generated using dsp chip
The sinusoidal signal of 1600HZ and 3200HZ respectively represents the carrier wave of data 0 and 1；The 2FSK modulation carrier wave is produced using iterative method
Raw, when DSP program initialization, first calculates separately out coefficient value required for 1600HZ and 3200HZ, then opens in timer
It is disconnected, enter timer interruption every time later, finds out new coefficient value using the coefficient value iteration found out, impulse finally is asked to it
Response can be obtained by the sinusoidal carrier signal of 1600HZ and 3200HZ；The method that the 2FSK demodulating algorithm uses differential detection
It realizes, simulates a bandpass filter using dsp chip, by the signal delay through wave filter and carry out phase with original signal
Multiply, finally obtain demodulated signal by low-pass filter, realize 2FSK modulation /demodulation using dsp chip, algorithm routine it is simple and
It is easily achieved.
In the present invention, select this high-frequency of 1600HZ and 3200HZ, high-intensitive carrier signal, cooperation rail channel into
Row transmission, can effectively ensure that the intensity of coded voice signal, improves the anti-interference of encoded signal.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (7)
1. a kind of MELP/CELP mixing voice navamander based on rail, including MELP/CELP hybrid coder and
MELP/CELP hybrid decoder, it is characterised in that: between MELP/CELP hybrid coder and MELP/CELP hybrid decoder also according to
It is secondary to be equipped with 2FSK modulator, first transducer, rail channel, second transducer and 2FSK demodulator；
The MELP/CELP hybrid coder be used for by primary speech signal be divided into speech frame draw, by speech frame by strong voiced sound,
Weak voiced sound and unvoiced classification, and hybrid coding speech frame is formed to MELP/CELP hybrid coding is carried out with speech frame；
MELP/CELP hybrid decoder is used to be decoded the hybrid coding speech frame received and synthetic filtering, and output is closed
At voice signal；
The 2FSK modulator is used to carry out signal modulation to hybrid coding speech frame, forms analog electrical signal；
The 2FSK demodulator forms hybrid coding speech frame for demodulating to analog electrical signal；
The first transducer is used to be converted to analog electrical signal vibration simulation signal, and the rail channel is used for vibration simulation
The transmission of signal, the second transducer are used to vibration simulation signal being converted to analog electrical signal.
2. the MELP/CELP mixing voice navamander according to claim 1 based on rail, it is characterised in that:
The MELP/CELP hybrid coder includes MELP coding module and CELP coding module, and MELP/CELP hybrid decoder includes
MELP decoder module and CELP decoder module, the MELP coding module and MELP decoder module, CELP coding module select number
Word signal processing chip, CELP decoder module select digital signal processing chip C64x series；2FSK modulator, 2FSK demodulator
Select dsp chip.
3. the communication means of the MELP/CELP mixing voice navamander according to claim 1 based on rail,
It is characterized in that: the following steps are included:
(1) a MELP/CELP mixing voice coded system based on rail is established；
(2) primary speech signal that choosing need to transmit is input in MELP/CELP hybrid coder, is divided in regular intervals
For speech frame, then speech frame will be pressed strong voiced sound, weak voiced sound and unvoiced classification；
(3) MELP/CELP hybrid coder identifies speech frame, if speech frame is strong voiced sound, is encoded using MELP, if
Weak voiced sound and voiceless sound, are encoded using CELP, and the data after coding form hybrid coding speech frame；
(4) hybrid coding speech frame adds the 1bit mode for indicating that the hybrid coding of speech frame is MELP coding or CELP coding
Output is packaged after decision bit to 2FSK modulator；
(5) hybrid coding speech frame carries out analog signal modulation through 2FSK modulator, forms analog electrical signal；
(6) analog electrical signal is converted to vibration simulation signal in first transducer, is loaded onto rail channel and is transmitted；
(7) vibration simulation signal is converted to analog electrical signal through second transducer after rail transmission again, then through 2FSK
Demodulator demodulation, obtains hybrid coding speech frame, is sent into MELP/CELP hybrid decoder；
(8) MELP/CELP hybrid decoder makes decisions according to the decision bit of hybrid coding speech frame, if MELP coding staff
Formula is then decoded using MELP, if CELP coding mode, then uses CELP decoding process, the signal obtained after decoding is through synthesizing
Reconstructed speech signal is generated after filtering.
4. the communication means of the MELP/CELP mixing voice navamander according to claim 3 based on rail,
It is characterized in that: in step (2), Fixed Time Interval 20ms.
5. the communication means of the MELP/CELP mixing voice navamander according to claim 3 based on rail,
Be characterized in that: MELP voice coding includes the fourier spectra amplitude frame for characterizing raw tone spectrum intensity, is carried out in step (3)
When MELP is encoded, remove fourier spectra amplitude frame, the output result of hybrid coder is made to reduce by 22 bits.
6. the communication means of the MELP/CELP mixing voice navamander according to claim 3 based on rail,
Be characterized in that: the 2FSK modulator and 2FSK demodulator generate the sinusoidal carrier signal of 1600HZ, 3200HZ, respectively represent
The carrier wave of data 0 and 1,2FSK modulator carrier wave are generated using iterative method, and the demodulation of 2FSK demodulator uses differential detection method；Institute
State the mechanical oscillation signal that first transducer generates 3200HZ.
7. the communication means of the MELP/CELP mixing voice navamander according to claim 3 based on rail,
Be characterized in that: in MELP/CELP hybrid coder, MELP coding uses phase alignment method.
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