CN107633839A - A kind of acoustic communication System and method for for active noise controlling - Google Patents
A kind of acoustic communication System and method for for active noise controlling Download PDFInfo
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Abstract
The invention discloses a kind of acoustic communication system for active noise controlling, the system includes：With reference to microphone (102), secondary control module (103), error microphone (104), acoustic communication module (105) and Digital Signal Analysis and Processing module (106)；The acoustic communication module (105) includes：The first acoustic communication of identical module, the second acoustic communication module and the 3rd acoustic communication module；The first acoustic communication module is used to the reference signal picked up passing through barrier metallization in the form of sound wave, is transferred to the Digital Signal Analysis and Processing module (106)；The second acoustic communication module is used to the filter coefficient signal of Digital Signal Analysis and Processing module (106) output passing through barrier metallization in the form of sound wave, is transferred to secondary control module (103)；The 3rd acoustic communication module is used to the error signal of error microphone (104) output passing through barrier metallization in the form of sound wave, is transferred to Digital Signal Analysis and Processing module (106).
Description
Technical field
The present invention relates to active noise controlling and acoustic communication field, more particularly to a kind of sound for active noise controlling
Communi-cation system and method.
Background technology
Submarine navigation device and other hardwares can produce noise in the process of running, also can be by the shadow of the factors such as environment
Ring, the method for reducing influence of noise causes increasing concern.Traditional Noise measarement is in a manner of passive acoustic control
It is main, but larger limitation in the factors such as volume, weight, cost be present in the equipment in which, and have to low frequency range noise control
Significant limitation, and active noise control technique can then solve these problems well, using secondary sound source or actuator come
Noise or vibration signal are offset, so as to reduce bad influence.
But need to use multiple sensors in active noise controlling, need transmission mutually to realize effectively between signal
Control, during the big difficult point that runs into be signal parting transmission problem.Due to the difference of application scenarios, with reference to microphone,
Secondary sound source, error signal microphone etc. and core control system usually require the not homonymy that cloth respectively is placed on metal shell, example
Between such as different cabins or inside and outside container, now influenceed by Faradic electricity magnetic screen effect, electromagnetic signal can not lead to
Cross.Traditionally, can only wire penetrate barrier to solve this problem, therefore the integrality for destroying the physical arrangement of equipment can not
Avoid.This can not only influence the service life of equipment, can also destroy its robustness and security, it is likely that equipment can be caused to damage
The serious consequence such as ruin, leak.Sound wave, can not as another wireless transmission means in addition to electromagnetic communication and lightwave communication
Restricted by electromagnetic shielding effect, it is lossless to penetrate barrier metallization, and when the distance between transducer is much larger than its diameter, energy
Conversion efficiency is more than other contactless energy transmission means, therefore acoustic communication means are to realize barrier metallization each side
Active noise controlling provide a kind of rich promising solution.
The content of the invention
It is an object of the invention to overcome to lack in the prior art to facilitate the feasible barrier metallization that do not destroy to realize both sides
A kind of the defects of communication is so as to carry out active noise controlling, there is provided acoustic communication System and method for for active noise controlling.
To achieve these goals, it is a kind of the invention provides a kind of acoustic communication system for active noise controlling
For the acoustic communication system of active noise controlling, need to penetrate the field of barrier metallization suitable for the information sent and received
Scape, the system include：With reference to microphone 102, secondary control module 103, error microphone 104, the and of acoustic communication module 105
Digital Signal Analysis and Processing module 106；The acoustic communication module 105 includes：The first acoustic communication of identical module, the second sound wave
Communication module and the 3rd acoustic communication module；Wherein,
It is described to refer to microphone 102, for picking up reference signal；
The first acoustic communication module, for the reference signal picked up to be passed through into barrier metallization in the form of sound wave,
It is transferred to the Digital Signal Analysis and Processing module 106；
The Digital Signal Analysis and Processing module 106, passed for receiving the reference signal sent with reference to microphone 102 and error
Sound device 104 is sent to error signal, and filter coefficient is updated；
The second acoustic communication module, for the filter coefficient signal for exporting Digital Signal Analysis and Processing module 106
Barrier metallization is passed through in the form of sound wave, is transferred to secondary control module 103；
The Digital Signal Analysis and Processing module 106, for according to filter coefficient signal of change filtering signal；
The secondary control module 103, for extracting and sending filtering signal to error microphone 104；
The error microphone 104, for receiving reference signal and filtering signal respectively, believed according to reference signal and filtering
It is error signal number to calculate error signal；
The 3rd acoustic communication module, the error signal for error microphone 104 to be exported are passed through in the form of sound wave
Barrier metallization, it is transferred to Digital Signal Analysis and Processing module 106.
One kind as said system is improved, and the system also includes：Power supply module 101, for for other moulds in system
Block provides electric energy, in addition to energy storage device.
One kind as said system is improved, and the first acoustic communication module includes：First electric signal processing unit, the
One ultrasonic transducer, the second ultrasonic transducer and the second electric signal processing unit；First electric signal processing unit and first
Ultrasonic transducer connects, positioned at the side of barrier metallization；Second ultrasonic transducer and the second electric signal processing unit connect
Connect, positioned at the opposite side of barrier metallization；
First electric signal processing unit, for being matched to electric signal, signal extraction and power amplification and volume
Code modulation treatment；Including：Source encoder, channel encoder, digital modulator, addition synchronization and training information unit and base band
Forming filter；
First ultrasonic transducer, is transmitted for the electric signal received to be converted into sound wave, there through metal
Barrier, it is sent to the second ultrasonic transducer；
Second ultrasonic transducer, for the acoustic signals received to be converted into electric signal, it is then input to the second electricity
Signal processing unit；
Second electric signal processing unit, including：Matched filter, demultiplexer, digital demodulator, channel coding
Device and source decoder.
As said system one kind improve, first ultrasonic transducer be PZT (piezoelectric transducer), magnetostrictive transducer,
Electrostatic transducer, EMAT, mechanical type transducer, or the improvement and combination of various transducers noted earlier.
As said system one kind improve, second ultrasonic transducer be PZT (piezoelectric transducer), magnetostrictive transducer,
Electrostatic transducer, EMAT, mechanical type transducer, or the improvement and combination of various transducers noted earlier.
One kind as said system is improved, and the Digital Signal Analysis and Processing module 106 also includes Man Machine Interface, is used
Family sets active noise controlling mode by the interface.
One kind as said system is improved, the secondary control module 103, including signal processing unit and secondary sound
Source；
The filter signal information that the signal processing unit exports Digital Signal Analysis and Processing module 106 carry out extraction and
Processing, obtains filtering signal；
The secondary sound source, for sending filtering signal to error microphone 104, for offsetting the noise of main sound source.
A kind of sound wave communication method for active noise controlling, realize, methods described includes based on above-mentioned system：
Step 1) is described to pick up reference signal with reference to microphone 102, is worn by the first acoustic communication module in the form of sound wave
Barrier metallization is crossed, is transferred to the Digital Signal Analysis and Processing module 106；
Step 2) the Digital Signal Analysis and Processing module 106 receives the reference signal and error sent with reference to microphone 102
Microphone 104 is sent to error signal, and filter coefficient is updated；
Step 3) the Digital Signal Analysis and Processing module 106 passes through institute according to filter coefficient signal of change filtering signal
State the second acoustic communication module and barrier metallization is passed through in the form of sound wave, be transferred to secondary control module 103；
Step 4) the secondary control module 103 extracts and sends filtering signal to error microphone 104；
Step 5) the error microphone 104 receives reference signal and filtering signal, according to reference signal and filtering signal
It is error signal to calculate error signal；
The error signal that the step 6) error microphone 104 exports is by the 3rd acoustic communication module, in the form of sound wave
Through barrier metallization, Digital Signal Analysis and Processing module 106 is transferred to.
One kind as the above method is improved, and the step 1) specifically includes：
Step S1) it is described with reference to microphone pickup reference signal, analog-to-digital conversion is carried out to the source signal, as the first sound
Source signal in first electric signal processing unit of wave communication module；
Step S2) the first acoustic communication module the first electric signal processing unit in source encoder the input is believed
Source signal is encoded, and inputs the digital modulator；
Step S3) the first acoustic communication module the first electric signal processing unit in digital modulator signal is entered
Row modulation, generates coded digital signal；
Step S4) the first acoustic communication module the first electric signal processing unit coded digital signal is added it is synchronous
And training information, generate simulation by base band shaping filter and send signal；
Step S5) by generation simulation send signal input the first acoustic communication module the first ultrasonic transducer, conversion
Into acoustic signals, barrier metallization is penetrated；
Step S6) laid by barrier metallization offside the first acoustic communication module the second ultrasonic transducer pickup penetrate
Sound wave afterwards, electric signal is converted to, and further carries out power amplification；
Step S7) the first acoustic communication module the second electric signal processing unit matched filter to reception signal
After being filtered, separated according to the frame structure feature of Design of Signal；Extract synchronizing signal, channel estimation Signal and effectively
Information data, complete synchronization and the channel equalization of data；
Step S8) the second electric signal processing unit of the first acoustic communication module uses and step to the signal after equilibrium
Rapid S2), step S3) corresponding to digital demodulation, channel decoding and source decoding pattern, accordingly enter row decoding, finally export the stay of two nights
Signal.
One kind as said system is improved, when the mode that user is set is adaptive mode, the tool of the step 2)
Body implementation process is：
The Digital Signal Analysis and Processing module 106 sets the initial value of coefficients w, and exponent number, step-size factor, institute
State and pass through signal x and wave filter of the first acoustic communication module transfer to Digital Signal Analysis and Processing module 106 with reference to microphone 102
The output y of sef-adapting filter is obtained after coefficient w convolution, secondary control module is passed to by the second acoustic communication module
103；The error microphone 104 obtains error signal e according to reference signal and signal y, passes through the 3rd acoustic communication mould
Block passes to Digital Signal Analysis and Processing module 106, is filtered device coefficient w renewal, such continuous iteration, until wave filter system
Number convergence.
The advantage of the invention is that：
1st, the acoustic communication system proposed by the present invention for active noise controlling, it is not necessary to penetrate metal using wire etc.
Barrier, you can realize that barrier metallization is inside and outside or the signal lossless of both sides transmits.
2nd, it is every to need to penetrate obstacle all the way when the acoustic communication system proposed by the present invention for active noise controlling works
The signal that thing is transmitted can work independently, and can also cross one another cooperation.
3rd, the acoustic communication system proposed by the present invention for active noise controlling be not related to electromagnetic wave signal transmitting and
Receive, the leakage of information can be effectively prevented in the transmitting procedure of signal.
4th, when the acoustic communication system proposed by the present invention for active noise controlling works, power supply module both can be independent
Certain partial circuit is powered, barrier can also be penetrated by energy capture means, so as to realize that certain side does not connect completely
Energy and data transfer in the case of touching.
5th, the acoustic communication system proposed by the invention for active noise controlling taken into account energy, data transfer it is comprehensive
Property and specific aim.Parting transmission can be carried out in two aspects of signal energy and signal message so that active noise controlling effect
It is more three-dimensional, more comprehensively.Polytype transmission means can be provided simultaneously to select to use for user so that active noise controlling is more
Efficiently, it is more targeted.
Brief description of the drawings
Fig. 1 is the schematic diagram of the acoustic communication system for active noise controlling of the present invention；
Fig. 2 is the schematic flow sheet of the acoustic communication signals transmission of the present invention.
Reference：
101st, power supply module 102, with reference to microphone 103, secondary control module
104th, error microphone 105, acoustic communication module 106, Digital Signal Analysis and Processing module
Embodiment
In conjunction with accompanying drawing and example, the invention will be further described.
In the presence of barrier metallization, inside and outside metal cabin, inside and outside canister, metal baffle both sides etc.,
Due to Faradic electricity magnetic screen effect, electromagnetic wave can not penetrate, and can only be penetrated by wire come transmission signal.Sound wave can be with lossless
Metal is penetrated, so as to provide the new paragon of a kind of information and energy transmission.
The information for needing to send is subjected to the processing such as coded modulation by specific communication mode, then passes through acoustic transducer
Sound wave form is converted into, penetrates barrier metallization, otherwise in receiving terminal by transducer converted back into electric signals, then synchronize solution
Adjust etc., the influence of channel is further fallen by the equilibrium such as System Discrimination, so as to which the transmission of information can be realized.Similarly, signal is increased
After the processing such as matching, necessarily efficiency energy can also be transferred to barrier metallization offside in the form of captureing energy, and the side is entered
Row energy supply.
With reference to figure 1, a kind of acoustic communication system for active noise controlling of the invention, suitable for what is sent and received
Information needs to penetrate the scene of barrier metallization, and the system includes：Power supply module 101, with reference to microphone 102, secondary control
Module 103, error microphone 104, acoustic communication module 105 and Digital Signal Analysis and Processing module 106；Wherein, the sound wave leads to
Letter module 105 includes the first acoustic communication module, the second acoustic communication module and the 3rd acoustic communication module；
The power supply module 101, for providing electric energy for other modules in system, it may also include energy storage device such as electricity
Pond etc..
It is described to refer to microphone 102, led to for picking up reference signal, and by the reference signal picked up by the first sound wave
Letter module 5 is transferred to the Digital Signal Analysis and Processing module 106；
The first acoustic communication module, for the reference signal picked up to be passed through into barrier metallization in the form of sound wave,
It is transferred to the Digital Signal Analysis and Processing module 106；
The second acoustic communication module, for the filter coefficient signal for exporting Digital Signal Analysis and Processing module 106
Barrier metallization is passed through in the form of sound wave, is transferred to secondary control module 103；
The 3rd acoustic communication module, the error signal for error microphone 104 to be exported are passed through in the form of sound wave
Barrier metallization, it is transferred to Digital Signal Analysis and Processing module 106.
As shown in Fig. 2 the first acoustic communication module includes：First electric signal processing unit, the first ultrasonic transducer,
Second ultrasonic transducer and the second electric signal processing unit；First electric signal processing unit and the first ultrasonic transducer connect
Connect, positioned at the side of barrier metallization；Second ultrasonic transducer and the second electric signal processing unit connection, hinders positioned at metal
Hinder the opposite side of thing；
First electric signal processing unit, for being matched to electric signal, signal extraction and power amplification and volume
Code modulation treatment, to ensure effective transmission of signal；The acoustic signal that the acoustic communication module 105 is transmitted is：Analogue communication
Signal, digital modulation signals etc.；Including：Source encoder, channel encoder, digital modulator, addition synchronization and training information
Unit and base band shaping filter；
First ultrasonic transducer, is transmitted for the electric signal received to be converted into sound wave, there through metal
Barrier, it is sent to the second ultrasonic transducer；
Second ultrasonic transducer, for the acoustic signals received to be converted into electric signal, it is then input to the second electricity
Signal processing unit；
Second electric signal processing unit, including：Matched filter, demultiplexer, digital demodulator, channel coding
Device and source decoder；The signal of the signal separation process extraction is effective training signal and data-signal, for carrying out together
Step, channel estimation and channel equalization；Channel equalization can use the time domains such as single carrier, multicarrier, frequency domain or time-frequency domain to combine
Equalization algorithm.
First ultrasonic transducer is ultrasonic transducer：PZT (piezoelectric transducer), magnetostrictive transducer, electrostatic transducer,
EMAT, mechanical type transducer etc., or the improvement and combination of various transducers noted earlier；Second ultrasonic transduction
Device is ultrasonic transducer：PZT (piezoelectric transducer), magnetostrictive transducer, electrostatic transducer, EMAT, mechanical type transducer
Deng, or the improvement and combination of various transducers noted earlier.
The acoustic signal of the first ultrasonic transducer transmission can add increasingly complex processing according to actual conditions, including
But it is not limited to the multiplexing goods multiple access intervention such as frequency division, time-division, code division, space division, polarization；The processing such as extension, encryption.
The Digital Signal Analysis and Processing module 106, receive the reference signal sent with reference to microphone 102 and error and pass
Sound device 104 is sent to error signal, and the renewal to filter coefficient is carried out using existing fixed coefficient or adaptive mode；
For example with adaptive mode, the initial value of the setting of Digital Signal Analysis and Processing module 106 coefficients w, and exponent number,
The coefficients such as step-length, it is described to give the Digital Signal Analysis and Processing by the first acoustic communication module transfer with reference to microphone 102
The signal x of module 106 passes through second acoustic communication with obtaining the output y of sef-adapting filter after coefficients w convolution
Module passes to the secondary control module 103；The error microphone 104 is according to reference signal and secondary control module 103
Wave filter output y obtain error signal e, the Digital Signal Analysis and Processing mould is passed to by the 3rd acoustic communication module
Block 106, device coefficient w renewal is filtered, such continuous iteration, until filter coefficient is restrained.
The Digital Signal Analysis and Processing module 106 also includes Man Machine Interface, and user is set by the interface and actively made an uproar
Acoustic control mode.
The secondary control module 103, including signal processing unit and secondary sound source；
The filter signal information that the signal processing unit exports Digital Signal Analysis and Processing module 106 carry out extraction and
Processing, obtains filtering signal；
The secondary sound source, for sending filtering signal to error microphone 104, for offsetting the noise of main sound source.
The error microphone 104, for receive respectively reference signal (or signal after certain delay of the signal) with
Filtering signal (echo signal), the difference calculated between reference signal and echo signal is error signal, and error signal is passed through
3rd acoustic communication module is sent to Digital Signal Analysis and Processing module 106.
When containing barrier metallization, such as metallic plate, container in the system, the power supply module 101 can be that metal hinders
Hinder the device of thing both sides respectively or unification provides energy.Also can be from the power harvesting of power supply module 101 in outside on the inside of device.
With reference to an example, the modules in a kind of acoustic communication system for active noise controlling are done into
One step explanation.
Barrier metallization is a metal cabin or container, and described to be located at outside housing with reference to microphone 102, pickup is joined
Signal is examined, gives the acoustical signal picked up to the Digital Signal Analysis and Processing module 106 by the first acoustic communication module transfer；Institute
State Digital Signal Analysis and Processing module 106 and be located at cabin case inside, the signal is analyzed and handled, obtain active noise control
The parameters such as filter coefficient processed simultaneously pass to the secondary control module 103 by the second acoustic communication module；The secondary control
The cloth of molding block 103 is placed on hull outside, and the signal is extracted and handled, is sent by secondary sound source, for offsetting main sound source
Noise；The difference that the error microphone 104 is picked up between desired signal and echo signal is tracked, by the 3rd sound wave
The effect of communication module is sent to the offside of barrier metallization, and the signal after extraction is used for the Digital Signal Analysis and Processing module
The renewal of 106 median filter coefficients, to ensure that error minimizes, so as to realize effective active noise controlling.
Above-mentioned each senser element and control module can be located at any side of barrier metallization respectively, including but not limited to
The permutation and combination of any of the above situation.The power supply module can be whole system or each module of barrier both sides is carried respectively
Energy supply amount, and can mutually transmit energy by way of captureing energy between the power supply module of both sides.
Below using acoustic communication module 105 described in the signal as Fig. 1 of the reference microphone pickup in active noise controlling
Input signal exemplified by, illustrate the present invention the sound wave communication method for active noise controlling include：
Step 1) is described with reference to microphone pickup reference signal, analog-to-digital conversion is carried out to the source signal, as the first sound
Source signal in first electric signal processing unit of wave communication module；
Source encoder is believed the input in first electric signal processing unit of step 2) the first acoustic communication module
Source signal is encoded, and can further reduce the influence of channel by the processing of channel encoder；Input the digital modulator；
The message sink coding mode includes：Predictive coding, block encoding, variable-length encoding, synthesis/decomposition coding, lossless pressure
Contracting, lossy compression method etc.；The channel coding method includes block code, convolutional code, Turbo code etc..
Digital modulator in first electric signal processing unit of step 3) the first acoustic communication module enters to signal
Row modulation, generates coded digital signal；
According to the characteristic of transmission rate, channel and signal needed for acoustic communication transmission concrete condition, chosen for digital modulator
The analog or digital modulation system of suitable type；
First electric signal processing unit of step 4) the first acoustic communication module adds synchronous to coded digital signal
And training information, generate simulation by base band shaping filter and send signal；
Step 5) sends the simulation of generation the first ultrasonic transducer of signal the first acoustic communication module of input, is converted into
Acoustic signals, penetrate barrier metallization；
The the second ultrasonic transducer pickup for the first acoustic communication module that step 6) is laid by barrier metallization offside penetrates
Sound wave afterwards, electric signal is converted to, and further carries out power amplification；
The compressional wave transducer for laying mode and being generally face of first ultrasonic transducer and the second ultrasonic transducer, or
Other parameters such as such as oblique transducer, frequency, model are established and are defined by transmission distortion degree minimum.
The matched filter of second electric signal processing unit of step 7) the first acoustic communication module is to reception signal
After being filtered, separated according to the frame structure feature of Design of Signal；Extract synchronizing signal, channel estimation Signal and effectively
Information data, complete synchronization and the channel equalization of data；
Signal after equilibrium is used second electric signal processing unit of step 8) the first acoustic communication module and step
It is rapid 2), digital demodulation, channel decoding and source decoding method corresponding to the step 3) scheme, accordingly enter row decoding, it is last defeated
Go out stay of two nights signal.
It should be noted last that the above embodiments are merely illustrative of the technical solutions of the present invention and it is unrestricted.Although ginseng
The present invention is described in detail according to embodiment, it will be understood by those within the art that, to the technical side of the present invention
Case is modified or equivalent substitution, and without departure from the spirit and scope of technical solution of the present invention, it all should cover in the present invention
Right among.
Claims (10)
1. a kind of acoustic communication system for active noise controlling, need to penetrate metal barrier suitable for the information sent and received
Hinder the scene of thing, it is characterised in that the system includes：It is transaudient with reference to microphone (102), secondary control module (103), error
Device (104), acoustic communication module (105) and Digital Signal Analysis and Processing module (106)；The acoustic communication module (105) includes：
The first acoustic communication of identical module, the second acoustic communication module and the 3rd acoustic communication module；Wherein,
The reference microphone (102), for picking up reference signal；
The first acoustic communication module, for the reference signal picked up to be passed through into barrier metallization in the form of sound wave, transmission
To the Digital Signal Analysis and Processing module (106)；
The Digital Signal Analysis and Processing module (106), passed for receiving the reference signal sent with reference to microphone (102) and error
Sound device (104) is sent to error signal, and filter coefficient is updated；
The second acoustic communication module, for the filter coefficient signal that exports Digital Signal Analysis and Processing module (106) with
Sound wave form passes through barrier metallization, is transferred to secondary control module (103)；
The Digital Signal Analysis and Processing module (106), for according to filter coefficient signal of change filtering signal；
The secondary control module (103), for extracting and sending filtering signal to error microphone (104)；
The error microphone (104), for receiving reference signal and filtering signal respectively, according to reference signal and filtering signal
Calculate error signal；
The 3rd acoustic communication module, the error signal for error microphone (104) to be exported pass through gold in the form of sound wave
Belong to barrier, be transferred to Digital Signal Analysis and Processing module (106).
2. the acoustic communication system according to claim 1 for active noise controlling, it is characterised in that the system is also
Including：Power supply module (101), for providing electric energy, in addition to energy storage device for other modules in system.
3. the acoustic communication system according to claim 1 for active noise controlling, it is characterised in that first sound
Wave communication module includes：At first electric signal processing unit, the first ultrasonic transducer, the second ultrasonic transducer and the second electric signal
Manage unit；First electric signal processing unit is connected with the first ultrasonic transducer, positioned at the side of barrier metallization；Described
Two ultrasonic transducers and the connection of the second electric signal processing unit, positioned at the opposite side of barrier metallization；
First electric signal processing unit, for being matched to electric signal, signal extraction and power amplification and coding adjust
System processing；Including：Source encoder, channel encoder, digital modulator, addition synchronization and training information unit and base band shaping
Wave filter；
First ultrasonic transducer, is transmitted for the electric signal received to be converted into sound wave, there through metal obstacle
Thing, it is sent to the second ultrasonic transducer；
Second ultrasonic transducer, for the acoustic signals received to be converted into electric signal, it is then input to the second electric signal
Processing unit；
Second electric signal processing unit, including：Matched filter, demultiplexer, digital demodulator, channel encoder and
Source decoder.
4. the acoustic communication system according to claim 3 for active noise controlling, it is characterised in that described the first to surpass
Sonic transducer is PZT (piezoelectric transducer), magnetostrictive transducer, electrostatic transducer, EMAT, mechanical type transducer, or preceding
The improvement and combination of various transducers described in face.
5. the acoustic communication system according to claim 3 for active noise controlling, it is characterised in that described the second to surpass
Sonic transducer is PZT (piezoelectric transducer), magnetostrictive transducer, electrostatic transducer, EMAT, mechanical type transducer, or preceding
The improvement and combination of various transducers described in face.
6. the acoustic communication system according to claim 1 for active noise controlling, it is characterised in that the signal point
Analysis also includes Man Machine Interface with processing module (106), and user sets active noise controlling mode by the interface.
7. the acoustic communication system according to claim 1 for active noise controlling, it is characterised in that the secondary control
Molding block (103), including signal processing unit and secondary sound source；
The filter signal information that Digital Signal Analysis and Processing module (106) exports is extracted and located by the signal processing unit
Reason, obtains filtering signal；
The secondary sound source, for sending filtering signal to error microphone (104), for offsetting the noise of main sound source.
8. the sound wave communication method for active noise controlling that a kind of system based on described in one of claim 1-7 is realized,
Methods described includes：
Step 1) it is described with reference to microphone (102) pickup reference signal, by the first acoustic communication module in the form of sound wave with sound
Waveshape passes through barrier metallization, is transferred to the Digital Signal Analysis and Processing module (106)；
Step 2) the Digital Signal Analysis and Processing module (106) receives the reference signal and error sent with reference to microphone (102)
The error signal that microphone (104) is sent, is updated to filter coefficient；
Step 3) the Digital Signal Analysis and Processing module (106) is according to filter coefficient signal of change filtering signal, by described
Second acoustic communication module passes through barrier metallization in the form of sound wave, is transferred to secondary control module (103)；
Step 4) the secondary control module (103) extracts and sends filtering signal to error microphone (104)；
Step 5) the error microphone (104) receives reference signal and filtering signal, according to reference signal and filtering signal meter
It is error signal to calculate error signal；
The error signal of the step 6) error microphone (104) output is worn by the 3rd acoustic communication module in the form of sound wave
Barrier metallization is crossed, is transferred to Digital Signal Analysis and Processing module (106).
9. the sound wave communication method according to claim 8 for active noise controlling, it is characterised in that the step 1)
Specifically include：
Step S1) it is described with reference to microphone pickup reference signal, analog-to-digital conversion is carried out to the source signal, led to as the first sound wave
Believe the source signal in the first electric signal processing unit of module；
Step S2) the first acoustic communication module the first electric signal processing unit in source encoder the input information source is believed
Number encoded, input the digital modulator；
Step S3) the first acoustic communication module the first electric signal processing unit in digital modulator signal is adjusted
System, generate coded digital signal；
Step S4) the first electric signal processing unit of the first acoustic communication module adds synchronous and instruction to coded digital signal
Practice information, generating simulation by base band shaping filter sends signal；
Step S5) by generation simulation send signal input the first acoustic communication module the first ultrasonic transducer, be converted into sound
Ripple signal, penetrates barrier metallization；
Step S6) laid by barrier metallization offside the first acoustic communication module the second ultrasonic transducer pickup penetrate after
Sound wave, electric signal is converted to, and further carries out power amplification；
Step S7) matched filter of the second electric signal processing unit of the first acoustic communication module carries out to reception signal
After filtering, separated according to the frame structure feature of Design of Signal；Extract synchronizing signal, channel estimation Signal and effective information
Data, complete synchronization and the channel equalization of data；
Step S8) the second electric signal processing unit of the first acoustic communication module uses and step to the signal after equilibrium
S2), step S3) corresponding to digital demodulation, channel decoding and source decoding pattern, accordingly enter row decoding, finally export the stay of two nights letter
Number.
10. the sound wave communication method according to claim 8 for active noise controlling, it is characterised in that when user sets
When the mode put is adaptive mode, the specific implementation process of the step 2) is：
The Digital Signal Analysis and Processing module (106) sets the initial value of coefficients w, and exponent number, step-size factor, described
Pass through signal x of the first acoustic communication module transfer to Digital Signal Analysis and Processing module (106) and filtering with reference to microphone (102)
The output y of sef-adapting filter is obtained after device coefficient w convolution, secondary control mould is passed to by the second acoustic communication module
Block (103)；The error microphone (104) obtains error signal e according to reference signal and signal y, passes through the 3rd sound wave
Communication module passes to Digital Signal Analysis and Processing module (106), is filtered device coefficient w renewal, such continuous iteration, until
Filter coefficient is restrained.
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| CN (1) | CN107633839A (en) |
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| CN109393664A (en) * | 2018-11-07 | 2019-03-01 | 歌尔科技有限公司 | A kind of bracelet and noise-reduction method with decrease of noise functions |
| CN111883096A (en) * | 2020-08-03 | 2020-11-03 | 西安艾科特声学科技有限公司 | Local space active noise control system based on rail locomotive |
| CN112558508A (en) * | 2019-09-25 | 2021-03-26 | 陕西重型汽车有限公司 | Sub-band road noise active control system with actuator |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109393664A (en) * | 2018-11-07 | 2019-03-01 | 歌尔科技有限公司 | A kind of bracelet and noise-reduction method with decrease of noise functions |
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Application publication date: 20180126 |