CN209070361U - A kind of active noise reduction system system for testing stability - Google Patents
A kind of active noise reduction system system for testing stability Download PDFInfo
- Publication number
- CN209070361U CN209070361U CN201821928089.8U CN201821928089U CN209070361U CN 209070361 U CN209070361 U CN 209070361U CN 201821928089 U CN201821928089 U CN 201821928089U CN 209070361 U CN209070361 U CN 209070361U
- Authority
- CN
- China
- Prior art keywords
- module
- noise reduction
- noise
- reduction system
- active noise
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000009467 reduction Effects 0.000 title claims abstract description 59
- 238000012360 testing method Methods 0.000 title claims abstract description 26
- 238000001514 detection method Methods 0.000 claims abstract description 20
- 238000004458 analytical method Methods 0.000 claims description 28
- 238000010223 real-time analysis Methods 0.000 claims description 11
- 230000003321 amplification Effects 0.000 claims description 5
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 5
- 238000012545 processing Methods 0.000 claims description 5
- 238000005086 pumping Methods 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 3
- 241000209140 Triticum Species 0.000 claims description 2
- 235000021307 Triticum Nutrition 0.000 claims description 2
- 238000000034 method Methods 0.000 description 6
- 230000010354 integration Effects 0.000 description 3
- 238000013112 stability test Methods 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 230000001133 acceleration Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000035772 mutation Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 206010057315 Daydreaming Diseases 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000001684 chronic effect Effects 0.000 description 1
- 238000013501 data transformation Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000008821 health effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000036651 mood Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
Landscapes
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
Abstract
The utility model discloses a kind of active noise reduction system system for testing stability, test macro include include with the active noise reduction system be electrically connected Detection of Stability system.Whether stable it can detect the active noise reduction system under various operating conditions by the active noise reduction system system for testing stability, and judge that unstable operating condition occurs in the active noise reduction system according to the result of feedback, to improve the working range and functional reliability of the active noise reduction system.
Description
Technical field
The utility model relates to automobile active noise controlling computing technique fields, and in particular to a kind of active noise reduction system is steady
Qualitative test system.
Background technique
It is growing day by day with car ownership, automobile have become modern society's city noise pollution main source it
One.In recent years, the rapid development of Domestic Automotive Industry and a large amount of of high-grade highway build, and make the average overall travel speed of automobile not
It is disconnected to improve, cause automobile noise higher and higher, and internal car noise is for the riding comfort of automobile and the shadow of users satisfaction degree
It rings, also therefore is gradually concerned by people.Related experiment shows that internal car noise is easy to generate driver and passenger tightly
, mood is irritated, the psychoreactions such as tired, absent minded, reduce the riding comfort of automobile, the healthy generation to people
Chronic hazard, and security risk is brought to the traveling of automobile.Therefore requirement of the user vehicle to automotive quality is also higher and higher, it is right
The control of automobile noise has larger impact for the user experience of automobile.
Correlative study shows that the low-frequency noise in motor vehicle is maximum to the health effect of people, and low frequency is made an uproar in motor vehicles room
Sound is mainly as caused by the low-frequency cycle noise of engine generation.In the prior art, mostly use " passive control " method to its into
Row control, the big multipotency of the measure taken effectively control interior medium, high frequency noise, but to low-frequency noise control effect
It is substantially all unobvious.Since noise impedance technology is as a kind of side that can efficiently control low-frequency noise in car room
Method has been increasingly becoming the development trend of the automobile noise control.Therefore, it is necessary to the stability of noise impedance technological system
Carry out correlative study and reliability demonstration.
Utility model content
The purpose of this utility model is to provide a kind of active noise reduction system stability test for the problems of the prior art
System.
In order to achieve the above objectives, the technical solution adopted in the utility model is:
A kind of active noise reduction system system for testing stability, including the stability being electrically connected with the active noise reduction system
Detection system.
Preferably, the active noise reduction system includes:
Noise information obtains module, for obtaining interior noise signal under various operating conditions；
Signal constructing module is controlled, module is obtained with the noise information and is electrically connected, for obtaining the noise information
The noise signal that modulus block obtains is integrated, and noise source is obtained；
First controller module is electrically connected with the control signal constructing module, constructs mould according to the control signal
Noise source after block integration exports de-noising signal；
Loudspeaker module, the loudspeaker module and first controller module are electrically connected, first controller
Module exports de-noising signal and obtains loudspeaker pumping signal through power amplification, is exported by the loudspeaker module；
The Detection of Stability system includes:
Noise data obtains module, for the noise letter at collecting test position after active noise reduction system control
Number；
Data real time analysis module obtains module with the noise data and is electrically connected, for obtaining to the noise data
The data of modulus block acquisition carry out processing analysis；
Information feedback module is analyzed, is electrically connected with the data real time analysis module, is analyzed in real time according to the data
Treated that data judge whether previous moment differs with the sound pressure level of later moment in time be more than setting value for module analysis；
Second controller module electrically connects with the analysis information feedback module and first controller module respectively
It connects, the movement of first controller module is controlled according to the information of the analysis information feedback module feedback.
Further, the Detection of Stability module further includes first information logging modle, and the first information records mould
Block and the analysis information feedback module are electrically connected, when the analysis information feedback module feeds back previous moment and later moment in time
Sound pressure level when differing by more than setting value, when the time of the first information logging modle record operating condition operation and mutation
It carves, and the number that programming count mutates.
Further, the Detection of Stability module further includes the second information logging modle, when the analysis information is fed back
Module feedback previous moment is differed with the sound pressure level of later moment in time when being less than setting value, the second information logging modle record
Live signal.
Preferably, the test macro further includes the anechoic room of closing setting, the first wheat being placed in the anechoic room
Gram wind and second microphone, the first loudspeaker being arranged on the wall of the anechoic room and the second loudspeaker are arranged described
There is the seat of headrest, first loudspeaker issues noise signal as noise source, and second loudspeaker is used in anechoic room
In the active noise reduction system, de-noising signal is issued, first microphone is arranged at the ceiling position of the anechoic room, uses
In the active noise reduction system, the second microphone is separately positioned on the left and right sides of the headrest, is used for the stability
Detection system acquires the noise signal after noise reduction at the headrest positions.
Further, on the seat of the people in the anechoic room when sitting, in front of the face orientation of people, described first
Loudspeaker is arranged on the wall before the anechoic room and extend into the anechoic room, and second loudspeaker has two
It is a, on the wall for the left and right sides that two second loudspeakers are individually positioned in the anechoic room and it extend into the anechoic room
In.
Further, the anechoic room includes front, rear, left and right four sides wall and roof, the four sides wall and the room
The material on top is identical.
Due to the application of the above technical scheme, the utility model has the advantage that this is practical new compared with prior art
Whether the active noise reduction system system for testing stability of type can detect the active noise reduction system under various operating conditions stable, and according to anti-
The result of feedback judges that unstable operating condition occurs in the active noise reduction system, to improve the working range of the active noise reduction system
And functional reliability.
Detailed description of the invention
Attached drawing 1 is the composition figure of the active noise reduction system of the utility model；
Attached drawing 2 is the composition figure of first controller module of the utility model；
Attached drawing 3 is the composition figure of the Detection of Stability system of the utility model；
Attached drawing 4 is the main view (outside) of the experimental rig of the utility model；
Attached drawing 5 is the main view (perspective) of the experimental rig of the utility model；
Attached drawing 6 is the active noise reduction system stability test flow chart of the utility model.
Specific embodiment
The technical solution of the utility model is further elaborated with reference to the accompanying drawing.
As shown in Figure 1, the active noise reduction system of the utility model includes that noise information obtains modules A 01, control signal structure
Modeling block A02, the first controller module A03 and loudspeaker module A04.Noise information obtains modules A 01 for obtaining various works
Interior noise signal under condition；It controls signal constructing module A02 and noise information obtains modules A 01 and is electrically connected, be used for noise
The noise signal that data obtaining module A01 is obtained is integrated, and noise source is obtained；First controller module A03 and control signal
Constructing module A02 is electrically connected, and exports de-noising signal according to the noise source after control signal constructing module A02 integration；Loudspeaker
Modules A 04 and the first controller module A03 are electrically connected, and the first controller module A03 output signal is raised through power amplification
Sound device pumping signal, is exported by loudspeaker module A04.
First controller module A03 include noise reduction mode input module C01, the first controlled load case determining module C02 and
Control order module C03 is chosen, as shown in Figure 2.
The active noise reduction system system for testing stability of the utility model includes Detection of Stability system, Detection of Stability system
System is electrically connected with active noise reduction system.As shown in figure 3, Detection of Stability system includes that noise data obtains module K01, data
Real time analysis module K02, analysis information feedback module K03 and second controller module K04, noise data obtain module K01
For the noise signal at collecting test position after active noise reduction system controls；Data real time analysis module K02 and noise number
It is electrically connected according to module K01 is obtained, the data for obtaining module K01 acquisition to noise data carry out processing analysis；Analysis letter
It ceases feedback module K03 and data real time analysis module K02 to be electrically connected, after data real time analysis module K02 analysis processing
Data judge previous moment differed with the sound pressure level of later moment in time whether be more than setting value；Second controller module K04 difference
It analyzes information feedback module K03 and the first controller module A03 to be electrically connected, be sent out for being fed back according to information feedback module K03
Information output order out gives the first controller module A03, controls the movement of the first controller module A03, when analysis information is anti-
When the sound pressure level of feedback module K03 feedback previous moment and later moment in time differs by more than setting value, second controller module K04 is sent
It instructs to the first controller module A03, when the sound pressure level phase of analysis information feedback module K03 feedback previous moment and later moment in time
When difference is less than setting value, second controller module K04 does not send instructions to the first controller module A03.
Detection of Stability system further includes first information logging modle K05, first information logging modle K05 and analysis information
Feedback module K03 is electrically connected, when analysis information feedback module K03 feedback previous moment differs super with the sound pressure level of later moment in time
When crossing setting value, first information logging modle K05 records the time of operating condition operation and mutates the moment, and programming count is sent out
The number of raw mutation.
Detection of Stability system further includes the second information logging modle K06, the second information logging modle K06 and analysis information
Feedback module K03 is electrically connected, when analysis information feedback module K03 feedback previous moment differs not with the sound pressure level of later moment in time
When more than setting value, first information logging modle K06 records live signal.
The active noise reduction system system for testing stability further includes the experimental rig for carrying out Detection of Stability, such as Fig. 4 and Fig. 5
It is shown, experimental rig include closing setting anechoic room 1, the first microphone 2 for being placed in anechoic room 1 and second microphone 3,
The seat with headrest is arranged in anechoic room 1 in the first loudspeaker 4 and the second loudspeaker 5 that are arranged on the wall of anechoic room 1
6。
Anechoic room 1 includes front, rear, left and right four sides wall and roof, and four sides wall is identical with the material on roof.People is in place
On seat 6 in anechoic room 1 when sitting, in front of the face orientation of people, the left and right sides of the body of people is respectively anechoic room 1
Left and right wall.
First loudspeaker 4 is arranged on the wall before anechoic room 1, and extend into anechoic room 1 from the wall of front,
First loudspeaker 4 is used as noise source, issues noise signal.Second loudspeaker 5 is used for active noise reduction system, passes through the first controller
Modules A 03 controls sounding, which is used for noise reduction；There are two second loudspeakers 5, and two the second loudspeakers 5 are individually positioned in and disappear
On the wall of the left and right sides of sound chamber 1, and it is extend into anechoic room 1 from the wall of the left and right sides respectively.In the present embodiment, first
Loudspeaker 4 and the second loudspeaker 5 are all made of 5 cun of passive sound.
First microphone 2 is arranged at the ceiling position of anechoic room 1, is used for active noise reduction system.Second microphone 3 is distinguished
It is arranged in the left and right sides of the headrest of the seat 6 in anechoic room 1, Detection of Stability system is used for, to acquire noise reduction back
The noise signal at position is rested the head on, provides real-time noise information for Detection of Stability system.
The active noise reduction system that Fig. 6 shows the utility model carries out the flow diagram of stability test, mainly wraps
Include following process step:
(1) modules A 01 is obtained by noise information and acquires the internal car noise signal under various operating conditions, using this signal as master
The input noise signal of dynamic noise reduction system.
Measurement condition includes the static state and dynamic operation condition after vehicle motor starting, and static operating condition includes at least IS Idle Switch
Air-conditioning, fixation, original place POT；Dynamic operation condition includes at least at the uniform velocity 40-100km/h, slow acceleration POT, anxious acceleration WOT, Tip in/
out.Each operating condition at least tests three groups of data, and every group is at least tested 10s, and ambient noise will be lower than institute's measurement condition when test
Noise at least 10dB(A).
When obtaining noise signal interior under each operating condition, measuring point is selected in the left and right sides of driver's headrest, by two
The noise signal of point position is compared, it is ensured that the accuracy and availability of test data.
(2) integration processing is carried out to step (1) test data obtained in control signal constructing module A02, obtained
The noise source of active noise reduction system.When test, which is output in anechoic room 1 by the first loudspeaker 4.
The signal after signal constructing module A02 is integrated will be controlled and obtain loudspeaker pumping signal after power amplification,
Using the loudspeaker signal as the noise source of active noise reduction system.
When signal will guarantee to switch between a upper operating condition and next operating condition in integrating treatment process, two kinds of sound letters
Number it is continuous.After pending data arranges, it is converted into the identifiable file format of active noise reduction system.
(3) first controller module A03 controlled according to noise source after export de-noising signal to loudspeaker module
A04。
Order control module C03 in first controller module A03 may be selected to reduce certain in 2 ranks, 4 ranks, 6 ranks of signal
One order noise or multiple order noises, posttectonic signal, which exports, gives loudspeaker module A04.
(4) output signal of step (3) obtains loudspeaker pumping signal after power amplification, controls loudspeaker module
A04 output signal noise reduction, de-noising signal herein pass through two the second loudspeakers 5 respectively and enter in anechoic room 1.
(5) module K01 is obtained by noise data to acquire in real time at left and right sides position of resting the head in anechoic room 1 after control
Noise signal, noise signal herein are obtained by two second microphones 3.
(6) noise signal obtained in data real time analysis module K02 to step (5) is analyzed and processed.
Real-time Fourier data transformation is carried out in data real time analysis module K02, to real-time Fourier transformation point
Analysis data are analyzed.
(7) judge in analysis information feedback module K03 previous moment differ with the sound pressure level of later moment in time whether be more than
Setting value.
Real-time difference when peak-peak noise reduction within 20-500Hz is detected, calculation formula is as shown in following formula 1；
Fa=Ft2- Ft1 (1)
In formula: Fa indicates the real-time difference of noise reduction effect, after Ft1 expression previous moment Fourier transformation at peak-peak
Noise figure, Ft2 indicate the noise figure after later moment in time Fourier transformation after Ft1 at peak-peak.It is previous in the present embodiment
Moment is preceding 0.05s, and later moment in time is rear 0.05s.
If the difference at this is greater than the set value, in the present embodiment, setting value is 2dB (A), analyzes information feedback module
K03 exports feedback information and gives second controller module K04, while the time of first information logging modle K05 record operating condition operation
And it mutates the moment, and the number that programming count mutates.
If the difference at this is not more than setting value, illustrate that active noise reduction system plays Noise Reduction, analysis information feedback
Feedback signal, the second information logging modle K06 do not record real time information to module K03, and the first controller module A03, which is continued to output, to be worked as
Preceding moment noise signal carries out noise reduction process.
(8) information that second controller module K04 is fed back according to information feedback module K03, output relevant control actively drop
The instruction for system of making an uproar, the instruction are directly inputted in the first controller module A03, when making current in the first controller module A03
The control parameter at quarter is reset, the first controller module even if active noise reduction system restarts work, in active noise reduction system
A03 exports de-noising signal according to the noise signal of subsequent time, repeats step (4) ~ (8).
So circulation carries out repeatedly, and circulation all includes all operating conditions every time, after circulation terminates, automatically begins to every time next
Circulation, exports examining report after circulation terminates to all automatically, more to going wrong to analyze the stability of the system
Operating condition carry out careful analysis, while for active noise reduction algorithm engineer provide relevant optimization direction and optimize operating condition.
The above embodiments are only for explaining the technical ideas and features of the present invention, and its object is to allow be familiar with technique
Personage can understand the content of the utility model and be implemented, do not limit the protection scope of the present invention,
All equivalent change or modifications according to made by the spirit of the present invention essence, should all cover in the protection scope of the utility model
It is interior.
Claims (6)
1. a kind of active noise reduction system system for testing stability, it is characterised in that: including electrically connecting with the active noise reduction system
The Detection of Stability system connect, the active noise reduction system include:
Noise information obtains module, for obtaining interior noise signal under various operating conditions；
Signal constructing module is controlled, module is obtained with the noise information and is electrically connected, for the noise information to be obtained mould
The noise signal that block obtains is integrated, and noise source is obtained；
First controller module is electrically connected with the control signal constructing module, whole according to the control signal constructing module
Noise source after conjunction exports de-noising signal；
Loudspeaker module, the loudspeaker module and first controller module are electrically connected, first controller module
It exports de-noising signal and obtains loudspeaker pumping signal through power amplification, exported by the loudspeaker module；
The Detection of Stability system includes:
Noise data obtains module, for the noise signal at collecting test position after active noise reduction system control；
Data real time analysis module obtains module with the noise data and is electrically connected, for obtaining mould to the noise data
The data of block acquisition carry out processing analysis；
Information feedback module is analyzed, is electrically connected with the data real time analysis module, according to the data real time analysis module
Treated that data judges whether previous moment is differed with the sound pressure level of later moment in time more than setting value for analysis；
Second controller module is electrically connected with the analysis information feedback module and first controller module, root respectively
The movement of first controller module is controlled according to the information of the analysis information feedback module feedback.
2. active noise reduction system system for testing stability according to claim 1, it is characterised in that: the Detection of Stability
Module further includes first information logging modle, and the first information logging modle electrically connects with the analysis information feedback module
It connects, it is described when the sound pressure level of the analysis information feedback module feedback previous moment and later moment in time differs by more than setting value
First information logging modle records the time of operating condition operation and mutates the moment, and the number that programming count mutates.
3. active noise reduction system system for testing stability according to claim 1, it is characterised in that: the Detection of Stability
Module further includes the second information logging modle, when the acoustic pressure of analysis information feedback module the feedback previous moment and later moment in time
When grade difference is less than setting value, second information logging modle records live signal.
4. active noise reduction system system for testing stability according to claim 1, it is characterised in that: the test macro is also
Anechoic room, the first microphone being placed in the anechoic room and second microphone, setting including closing setting disappear described
The first loudspeaker and the second loudspeaker on the wall of sound chamber are arranged in the anechoic room seat with headrest, and described the
One loudspeaker issues noise signal as noise source, and second loudspeaker is used for the active noise reduction system, issues noise reduction letter
Number, first microphone is arranged at the ceiling position of the anechoic room, is used for the active noise reduction system, second wheat
Gram wind is separately positioned on the left and right sides of the headrest, is used for the Detection of Stability system, acquires the headrest position after noise reduction
Set the noise signal at place.
5. active noise reduction system system for testing stability according to claim 4, it is characterised in that: people is in the anechoic room
In the seat on sitting when, in front of the face orientation of people, first loudspeaker is arranged in front of the anechoic room
It on wall and extend into the anechoic room, there are two second loudspeakers, and two second loudspeakers are individually positioned in
On the wall of the left and right sides of the anechoic room and it extend into the anechoic room.
6. active noise reduction system system for testing stability according to claim 4, it is characterised in that: the anechoic room includes
Front, rear, left and right four sides wall and roof, the four sides wall are identical with the material on the roof.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821928089.8U CN209070361U (en) | 2018-11-22 | 2018-11-22 | A kind of active noise reduction system system for testing stability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821928089.8U CN209070361U (en) | 2018-11-22 | 2018-11-22 | A kind of active noise reduction system system for testing stability |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209070361U true CN209070361U (en) | 2019-07-05 |
Family
ID=67100086
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821928089.8U Active CN209070361U (en) | 2018-11-22 | 2018-11-22 | A kind of active noise reduction system system for testing stability |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209070361U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109587618A (en) * | 2018-11-22 | 2019-04-05 | 清华大学苏州汽车研究院（相城） | A kind of active noise reduction system stability test method and test macro |
-
2018
- 2018-11-22 CN CN201821928089.8U patent/CN209070361U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109587618A (en) * | 2018-11-22 | 2019-04-05 | 清华大学苏州汽车研究院（相城） | A kind of active noise reduction system stability test method and test macro |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109587618A (en) | A kind of active noise reduction system stability test method and test macro | |
| CN105489063B (en) | A kind of new-energy automobile pedestrian's sound alarming device with active forewarning | |
| DE102018204218A1 (en) | Real-time engine sound reproduction method and vehicle using the real-time engine sound reproduction method | |
| CN109747575B (en) | Multi-mode in-vehicle sound quality optimization system based on order optimization | |
| CN105835804B (en) | For monitoring the method and apparatus that vehicle back occupant takes a seat region | |
| CN110481470B (en) | Design method of active sound production system of electric automobile | |
| CN207692040U (en) | A kind of electric vehicle active noise control system | |
| CN108597489A (en) | A kind of bullet train car Active noise control system | |
| CN103813255B (en) | The method of testing of automobile audio performance | |
| CN107351853A (en) | A kind of active noise reduction seat suitable for high ferro business class | |
| CN106992002A (en) | Dynamic acoustic models switching for improving noisy speech identification | |
| CN107274878A (en) | A kind of Active noise control system in railcar train drivers' cab | |
| CN109493876A (en) | A kind of microphone array control method, device and vehicle | |
| CN209070361U (en) | A kind of active noise reduction system system for testing stability | |
| CN112017626B (en) | Active noise reduction method for rail transit vehicle and cab | |
| CN105992104A (en) | Control system for noise generated by functional hardware components | |
| CN114720076A (en) | Seat vibration comfort testing method and device | |
| CN107351740A (en) | A kind of automobile active noise reduction seat | |
| CN104215419A (en) | Test system and test method for abnormal sound of automobile panoramic sunroof shade curtain | |
| CN113689842A (en) | Integrated system for active noise reduction and audio power amplification of automobile | |
| CN109946091A (en) | A method of evading vehicle body low-frequency noise problem | |
| CN112254805A (en) | In-vehicle sound quality testing device and method | |
| CN110022513A (en) | Sound quality Active Control Method and system in a kind of vehicle | |
| CN211742643U (en) | Vehicle-mounted noise reduction control device | |
| CN107509156A (en) | Sound equipment tuning device, tuning system and method with audio analysis writing function |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |