CN109327780A - A kind of speaker drive protection system - Google Patents
A kind of speaker drive protection system Download PDFInfo
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- CN109327780A CN109327780A CN201811365022.2A CN201811365022A CN109327780A CN 109327780 A CN109327780 A CN 109327780A CN 201811365022 A CN201811365022 A CN 201811365022A CN 109327780 A CN109327780 A CN 109327780A
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- loudspeaker
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- 238000006073 displacement reaction Methods 0.000 claims abstract description 87
- 230000001681 protective effect Effects 0.000 claims abstract description 28
- 230000005236 sound signal Effects 0.000 claims abstract description 26
- 230000004048 modification Effects 0.000 claims description 14
- 238000012986 modification Methods 0.000 claims description 14
- 230000005611 electricity Effects 0.000 claims description 8
- 230000003321 amplification Effects 0.000 claims description 2
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 2
- 230000003111 delayed effect Effects 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000032683 aging Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/06—Loudspeakers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2420/00—Details of connection covered by H04R, not provided for in its groups
- H04R2420/03—Connection circuits to selectively connect loudspeakers or headphones to amplifiers
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Circuit For Audible Band Transducer (AREA)
Abstract
The invention discloses a kind of speaker drives to protect system, the Current Voltage sensor module including being capable of real-time acquisition speaker current value and voltage value；Loudspeaker model can be updated according to speaker current value and the voltage value dynamic of Current Voltage sensor module Real-time Feedback, and by the loudspeaker model feedback updated to the loudspeaker modeling module of loudspeaker maximum displacement protective module；The loudspeaker maximum displacement protective module that audio-frequency amplifier is sent to after signal limitation is protected can be carried out to audio signal by newest loudspeaker model based on the received；And the audio signal sent through loudspeaker maximum displacement protective module and the audio-frequency amplifier for generating digit pulse drive the speaker can be received.The invention has the advantages that loudspeaker model can be updated accurately to limit loudspeaker displacement by dynamic, loudspeaker generation of damaged condition due to beyond greatest limit displacement can be prevented.
Description
Technical field
The present invention relates to loudspeaker signal processing and protection technique field, and in particular to a kind of speaker drive protection system
System.
Technical background
It is highly integrated with consumer products such as portable computers, it is desirable that loudspeaker is in the premise for issuing high loudness sound
Under, volume is small as far as possible.The appearance of Microspeaker solves the contradiction of this respect, it converts electrical signals to voice signal,
And as air pulsation travels in ambient enviroment.
Although Microspeaker can issue louder sound, it is easy to happen altogether in electric signal low frequency part
Vibration, if be not protected, instantaneous or lasting exceeds the loudspeaker displacement limit, by the permanent damage diaphragm of loudspeaker and knot
Structure.Due to loudspeaker parameters with environment temperature, using the time, degree of aging variation and change, so being raised using fixed
Sound device model is difficult to carry out loudspeaker displacement accurate limitation protection.Therefore needing to invent a kind of can update loudspeaking by dynamic
Device model accurately carries out limitation protection to loudspeaker displacement, prevents loudspeaker in use because beyond greatest limit position
It moves and damages, the system of energy effective protection loudspeaker.
Summary of the invention
The object of the present invention is to provide it is a kind of can by dynamic update loudspeaker model come accurately to loudspeaker displacement into
The speaker drive of row limitation protection protects system.
To realize the above-mentioned technical purpose, present invention employs following technical solutions: a kind of speaker drive protection
System, including loudspeaker maximum displacement protective module, audio-frequency amplifier, Current Voltage sensor module and loudspeaker model mould
Block；
The Current Voltage sensor module: it is capable of real-time acquisition the current value and voltage value of loudspeaker, and will be collected
Speaker current value and voltage value Real-time Feedback give loudspeaker modeling module；
The loudspeaker modeling module: can be according to the speaker current value and electricity of Current Voltage sensor module Real-time Feedback
Pressure value dynamic updates loudspeaker model, and gives the loudspeaker model feedback updated to loudspeaker maximum displacement protective module；
The loudspeaker maximum displacement protective module: energy real-time reception audio signal and loudspeaker modeling module feedback are most
New loudspeaker model, and signal limitation can be carried out according to audio signal of the received newest loudspeaker model of institute to input and protected
After be sent to audio-frequency amplifier；
The audio-frequency amplifier: the audio letter sent after the limitation protection of loudspeaker maximum displacement protective module can be received
Number, and digit pulse drive the speaker is generated according to audio signal；
The input terminal of the output end connection audio-frequency amplifier of the loudspeaker maximum displacement protective module, audio-frequency amplifier
Output end connects the input terminal of loudspeaker, the input of the signal acquisition terminal connection loudspeaker of the Current Voltage sensor module
End, the input terminal of the signal output end connection loudspeaker modeling module of Current Voltage sensor module, loudspeaker modeling module
The input terminal of output end connection loudspeaker maximum displacement protective module.
Further, a kind of speaker drive above-mentioned protects system, in which: loudspeaker maximum displacement protective module packet
It includes: the loudspeaker displacement impedance function module and gain control module of energy real-time reception audio signal；
The loudspeaker displacement impedance function module: can be according to the newest loudspeaker of loudspeaker modeling module Real-time Feedback
Impedance model calculates loudspeaker predictive displacement, and by loudspeaker predictive displacement and internal preset loudspeaker maximum displacement
It compares, when comparison obtains loudspeaker predictive displacement greater than loudspeaker maximum displacement, deamplification can be sent to gain control
Molding block；When comparison obtains loudspeaker predictive displacement less than loudspeaker maximum displacement, amplified signal can be sent and controlled to gain
Module；
The gain control module: the deamplification or amplification that energy real-time reception loudspeaker displacement impedance function module is sent
Signal, and be sent to after the received audio signal is decayed or amplified according to the received deamplification of institute or amplified signal
Audio-frequency amplifier；
The output end of the input terminal connection loudspeaker modeling module of the loudspeaker displacement impedance function module, loudspeaker position
The input terminal of the output end connection gain control module of impedance function module is moved, the output end connection audio of gain control module is put
The input terminal of big device.
Further, a kind of speaker drive above-mentioned protects system, in which: also connects in the input terminal of gain control module
It is connected to time delay module, is then forwarded to gain control after the default delay time of audio signal delay that time delay module is used to be inputted
Module.
Further, a kind of speaker drive above-mentioned protects system, in which: time delay module is delayed to signal pre-
If delay time is 10ms.
Further, a kind of speaker drive above-mentioned protects system, in which: loudspeaker modeling module includes: loudspeaker
Impedance model module, anti-motional electromotive force prediction module, practical anti-motional electromotive force computing module and loudspeaker impedance model modification control
Molding block；
The loudspeaker impedance model module: the initial impedance model of loudspeaker can be recorded；
The anti-motional electromotive force prediction module: can according to Current Voltage sensor module feed back speaker current value and raise
The initial impedance model pre-estimating of sound device impedance model module feedback goes out anti-motional electromotive force, and the anti-motional electromotive force estimated out is sent out
Give loudspeaker impedance model modification control module；
The anti-motional electromotive force computing module of reality: the loudspeaker voltage that can be fed back according to Current Voltage sensor module
Value, speaker current value and loudspeaker D.C. resistance calculate practical counter electromotive force, and the calculated reality of institute is anti-raw electric
Kinetic potential is sent to loudspeaker impedance model modification control module；
The loudspeaker impedance model modification control module: can calculate the received anti-motional electromotive force estimated and practical anti-
Error between motional electromotive force, and whether error in judgement reaches preset value, it, can be to loudspeaking when judging that error reaches preset value
Device impedance model is updated, and the updated loudspeaker impedance model of institute is sent in loudspeaker maximum displacement protective module
Loudspeaker displacement impedance function module.
Through the implementation of the above technical solution, the beneficial effects of the present invention are: can by dynamic update loudspeaker model come
Limitation protection accurately is carried out to loudspeaker displacement, loudspeaker is avoided to exceed greatest limit displacement in use, it is effectively anti-
The only loudspeaker generation of damaged condition due to beyond greatest limit displacement in use, protects loudspeaker, extends and raise
The service life of sound device.
Detailed description of the invention:
Fig. 1 is the principle schematic diagram that a kind of speaker drive of the present invention protects system.
Fig. 2 is loudspeaker impedance model modification schematic illustration.
Specific embodiment
The present invention will be further explained below with reference to the attached drawings and specific examples.
As shown in Figure 1 and Figure 2, a kind of speaker drive protects system, including loudspeaker maximum displacement protective module
1, audio-frequency amplifier 2, Current Voltage sensor module 3 and loudspeaker modeling module 4；
The Current Voltage sensor module 3: it is capable of real-time acquisition the current value and voltage value of loudspeaker, and will be collected
Speaker current value and voltage value Real-time Feedback are to loudspeaker modeling module 4；
The loudspeaker modeling module 4: can according to the speaker current value of 3 Real-time Feedback of Current Voltage sensor module with
Voltage value dynamic updates loudspeaker model, and by the loudspeaker model feedback updated to loudspeaker maximum displacement protective module 1；
The loudspeaker maximum displacement protective module 1: energy real-time reception audio signal and loudspeaker modeling mould feedback are most
New loudspeaker model, and can according to received newest loudspeaker model signal limitation carried out to the audio signal of input protect
Audio-frequency amplifier 2 is sent to after shield；
The audio-frequency amplifier 2: the audio letter sent after the limitation protection of loudspeaker maximum displacement protective module 1 can be received
Number, and digit pulse drive the speaker 5 is generated according to audio signal；
The input terminal of the output end connection audio-frequency amplifier 2 of the loudspeaker maximum displacement protective module 1, audio-frequency amplifier
The input terminal of 2 output end connection loudspeaker 5, the signal acquisition terminal connection loudspeaker 5 of the Current Voltage sensor module 3
Input terminal, the input terminal of the signal output end connection loudspeaker modeling module 4 of Current Voltage sensor module 3, loudspeaker modeling
The input terminal of the output end connection loudspeaker maximum displacement protective module 1 of module 4；
In the present embodiment, loudspeaker maximum displacement protective module 1 includes: the loudspeaker position of energy real-time reception audio signal
Move impedance function module 11 and gain control module 12；
The loudspeaker displacement impedance function module 11: can be according to newest the raising of 4 Real-time Feedback of loudspeaker modeling module
Sound device impedance model calculates loudspeaker predictive displacement, and loudspeaker predictive displacement and internal preset loudspeaker is maximum
Displacement compares, and when comparison obtains loudspeaker predictive displacement greater than loudspeaker maximum displacement, can send deamplification to increasing
Beneficial control module 12；When comparison obtains loudspeaker predictive displacement less than loudspeaker maximum displacement, amplified signal can be sent to increasing
Beneficial control module 12；
The gain control module 12: can the deamplification that sends of real-time reception loudspeaker displacement impedance function module 11 or
Amplified signal, and sent out after the received audio signal is decayed or amplified according to the received deamplification of institute or amplified signal
Give audio-frequency amplifier 2；
The output end of the input terminal connection loudspeaker modeling module 4 of the loudspeaker displacement impedance function module 11, loudspeaking
The input terminal of the output end connection gain control module 12 of device displacement impedance function module 11, the output end of gain control module 12
Connect the input terminal of audio-frequency amplifier 2；
In the present embodiment, it is also connected with time delay module 13 in the input terminal of gain control module 12, time delay module 13 is used
It is then forwarded to gain control module 12 after the audio signal inputted is delayed default delay time, may insure gain in this way
Control module adjustment is completed, and the stability in use of loudspeaker is improved；In the present embodiment, time delay module 13 prolongs signal
When default delay time be 10ms；
In the present embodiment, loudspeaker modeling module 4 includes: loudspeaker impedance model module 41, the prediction of anti-motional electromotive force
Module 42, practical anti-motional electromotive force computing module 43 and loudspeaker impedance model modification control module 44；
The loudspeaker impedance model module 41: the impedance model of loudspeaker can be recorded；
The anti-motional electromotive force prediction module 42: the speaker current value that can be fed back according to Current Voltage sensor module 3
And the impedance model that loudspeaker impedance model module 41 is fed back estimates out anti-motional electromotive force, and the anti-motional electromotive force that will be estimated out
It is sent to loudspeaker impedance model modification control module 44；
The anti-motional electromotive force computing module 43 of reality: can be according to the loudspeaker electricity that Current Voltage sensor module 3 is fed back
Pressure value, speaker current value and loudspeaker D.C. resistance calculate practical counter electromotive force, and give birth to the calculated reality of institute is counter
Electromotive force is sent to loudspeaker impedance model modification control module 44；
The loudspeaker impedance model modification control module 44: can calculate the received anti-motional electromotive force and reality estimated
Error between anti-motional electromotive force, and whether error in judgement reaches preset value can be to raising when judging that error reaches preset value
Sound device impedance model is updated, and the updated loudspeaker impedance model of institute is sent to loudspeaker maximum displacement protective module
Loudspeaker displacement impedance function module 11 in 1；
Working principle of the present invention is as follows:
When loudspeaker is produced, the loudspeaker impedance model module 41 in loudspeaker modeling module 4 first records loudspeaker
Initial impedance model, the foundation of loudspeaker initial impedance model specifically includes the following steps:
Step (1): first generating the swept-frequency signal of fixed amplitude using audio generator to loudspeaker, and the range of frequency sweep takes (0
~3) khz；
Step (2): and then the maximum voltage current value of each Frequency point of loudspeaker is read by Current Voltage sensor, meter
Calculate initial impedance model, wherein the specific formula for calculation of loudspeaker initial impedance model are as follows:
Wherein, Bl is the power factor, MmsFor quality, RmsFor machine damping factor, CmsFor mechanical compliance；
Behind audio signal input loudspeaker maximum displacement protective module 1, audio signal is transmitted to time delay module 13 all the way, warp
Time delay module 13 is transmitted to gain control module 12 after being delayed, during time delay module 12 is delayed to audio signal, electricity
Galvanic electricity pressure sensor module 3 can in real time acquire loudspeaker current value and voltage value, and by speaker current value collected with
Voltage value Real-time Feedback is to loudspeaker modeling module 4；
Loudspeaker modeling module 4 receives the speaker current value and loudspeaker voltage value of the feedback of Current Voltage sensor 3
Afterwards, the loudspeaking that the anti-motional electromotive force prediction module 42 in loudspeaker modeling module 4 can be fed back according to Current Voltage sensor module 3
The impedance model that device current value and loudspeaker impedance model module 41 are fed back estimates out anti-motional electromotive force, and anti-by what is estimated out
Motional electromotive force is sent to loudspeaker impedance model modification control module 44, wherein estimates the specific formula for calculation of anti-motional electromotive force
Are as follows:
Vbemfest(t)=I (t) * L-1ZBEMF(s)
Wherein, VbemfestIt (t) is the anti-motional electromotive force estimated out, I (t) is the speaker current that current sensor is read
Value, L-1Zbemf_It (t) is ZBEMF(s) it does Laplce's inversion to obtain, ZBEMFIt (s) is loudspeaker impedance model；
Meanwhile the anti-motional electromotive force computing module 43 of reality in loudspeaker modeling module 4 can be according to Current Voltage sensor
Loudspeaker voltage value, speaker current value and the loudspeaker D.C. resistance that module 3 is fed back calculate practical counter electromotive force, and
The calculated anti-motional electromotive force of reality of institute is sent to loudspeaker impedance model modification control module 44, wherein practical anti-raw electricity
The specific formula for calculation of kinetic potential are as follows:
Vbemf (t)=V (t)-Re*I (t)
Wherein, VbemfIt (t) is practical anti-motional electromotive force, V (t) is the loudspeaker voltage value that voltage sensor is read, I (t)
For the speaker current value that current sensor is read, Re is speaker resistor；
When the loudspeaker impedance model modification control module 44 in loudspeaker modeling module 4 receive estimate counter give birth to it is electronic
When gesture and practical anti-motional electromotive force, the error between the anti-motional electromotive force estimated and practical anti-motional electromotive force can be calculated, and judge
Whether error reaches preset value, when judging that error reaches preset value, can be updated to loudspeaker impedance model, and by institute
Updated loudspeaker impedance model is sent to the loudspeaker displacement impedance function module in loudspeaker maximum displacement protective module 1
11,
Loudspeaker displacement impedance function module 11 is according to the newest loudspeaker impedance of 4 Real-time Feedback of loudspeaker modeling module
Model calculates loudspeaker predictive displacement, and loudspeaker predictive displacement and internal preset loudspeaker maximum displacement are carried out
Comparison can send deamplification and give gain control molding when comparison obtains loudspeaker predictive displacement greater than loudspeaker maximum displacement
Block 12；When comparison obtains loudspeaker predictive displacement less than loudspeaker maximum displacement, amplified signal can be sent and give gain control molding
Block 12；
After gain control module 12 receives deamplification or amplified signal, time delay module 13 is just by the audio of input
Signal is sent to gain control module 12, and gain control module 12 can be according to the deamplification or amplified signal pair received at this time
The audio signal of input is decayed or is sent to after being amplified audio-frequency amplifier 2；Audio-frequency amplifier 2 is generated further according to audio signal
Digit pulse drive the speaker 5.
The invention has the advantages that loudspeaker model can be updated by dynamic accurately to carry out limitation guarantor to loudspeaker displacement
Shield avoids loudspeaker from exceeding greatest limit displacement in use, effectively prevent loudspeaker in use because beyond most
The generation of big extreme displacement and damaged condition, protects loudspeaker, extends the service life of loudspeaker.
Claims (5)
1. a kind of speaker drive protects system, it is characterised in that: amplify including loudspeaker maximum displacement protective module, audio
Device, Current Voltage sensor module and loudspeaker modeling module；
The Current Voltage sensor module: being capable of real-time acquisition the current value and voltage value of loudspeaker, and by loudspeaking collected
Device current value and voltage value Real-time Feedback give loudspeaker modeling module；
The loudspeaker modeling module: can be according to the speaker current value and voltage value of Current Voltage sensor module Real-time Feedback
Dynamic updates loudspeaker model, and gives the loudspeaker model feedback updated to loudspeaker maximum displacement protective module；
The loudspeaker maximum displacement protective module: newest the raising of energy real-time reception audio signal and loudspeaker modeling module feedback
Sound device model, and can according to received newest loudspeaker model signal limitation protection is carried out to the audio signal of input after send
To audio-frequency amplifier；
The audio-frequency amplifier: can receive the audio signal sent after the limitation protection of loudspeaker maximum displacement protective module, and
Digit pulse drive the speaker is generated according to audio signal；
The input terminal of the output end connection audio-frequency amplifier of the loudspeaker maximum displacement protective module, the output of audio-frequency amplifier
The input terminal of end connection loudspeaker, the input terminal of the signal acquisition terminal connection loudspeaker of the Current Voltage sensor module, electricity
The input terminal of the signal output end connection loudspeaker modeling module of galvanic electricity pressure sensor module, the output end of loudspeaker modeling module
Connect the input terminal of loudspeaker maximum displacement protective module.
2. a kind of speaker drive according to claim 1 protects system, it is characterised in that: loudspeaker maximum displacement protection
Module includes: the loudspeaker displacement impedance function module and gain control module of energy real-time reception audio signal；
The loudspeaker displacement impedance function module: can be according to the newest loudspeaker impedance mould of loudspeaker modeling module Real-time Feedback
Type calculates loudspeaker predictive displacement, and loudspeaker predictive displacement and internal preset loudspeaker maximum displacement are carried out pair
Than deamplification can be sent to gain control module when comparison obtains loudspeaker predictive displacement greater than loudspeaker maximum displacement；
When comparison obtains loudspeaker predictive displacement less than loudspeaker maximum displacement, amplified signal can be sent to gain control module；
The gain control module: the deamplification or amplification letter that energy real-time reception loudspeaker displacement impedance function module is sent
Number, and sound is sent to after the received audio signal is decayed or amplified according to the received deamplification of institute or amplified signal
Audio amplifier；
The output end of the input terminal connection loudspeaker modeling module of the loudspeaker displacement impedance function module, loudspeaker displacement resistance
The input terminal of the output end connection gain control module of anti-function module, the output end of gain control module connect audio-frequency amplifier
Input terminal.
3. a kind of speaker drive according to claim 2 protects system, it is characterised in that: in the defeated of gain control module
Enter end and be also connected with time delay module, is then forwarded to after the default delay time of audio signal delay that time delay module is used to be inputted
Gain control module.
4. a kind of speaker drive according to claim 3 protects system, it is characterised in that: time delay module carries out signal
The default delay time of delay is 10ms.
5. a kind of speaker drive according to claim 2 protects system, it is characterised in that: loudspeaker modeling module packet
It includes: loudspeaker impedance model module, anti-motional electromotive force prediction module, practical anti-motional electromotive force computing module and loudspeaker impedance mould
Type updates control module；
The loudspeaker impedance model module: the impedance model of loudspeaker can be recorded；
The anti-motional electromotive force prediction module: can be according to the speaker current value and loudspeaker that Current Voltage sensor module is fed back
The impedance model of impedance model module feedback estimates out anti-motional electromotive force, and the anti-motional electromotive force estimated out is sent to loudspeaking
Device impedance model updates control module；
The anti-motional electromotive force computing module of reality: can according to Current Voltage sensor module feed back loudspeaker voltage value, raise
Sound device current value and loudspeaker D.C. resistance calculate practical anti-motional electromotive force, and by the calculated reality of institute it is counter give birth to it is electronic
Gesture is sent to loudspeaker impedance model modification control module；
The loudspeaker impedance model modification control module: can calculate the received anti-motional electromotive force estimated and practical anti-raw electricity
Error between kinetic potential, and whether error in judgement reaches preset value, when judging that error reaches preset value, can hinder loudspeaker
Anti- model is updated, and by updated loudspeaker impedance model be sent to raising in loudspeaker maximum displacement protective module
Sound device displacement impedance function module.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811365022.2A CN109327780B (en) | 2018-11-16 | 2018-11-16 | Loudspeaker drive protection system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811365022.2A CN109327780B (en) | 2018-11-16 | 2018-11-16 | Loudspeaker drive protection system |
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|---|---|
| CN109327780A true CN109327780A (en) | 2019-02-12 |
| CN109327780B CN109327780B (en) | 2023-12-29 |
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| CN201811365022.2A Active CN109327780B (en) | 2018-11-16 | 2018-11-16 | Loudspeaker drive protection system |
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| CN113965851A (en) * | 2020-07-02 | 2022-01-21 | 上海艾为电子技术股份有限公司 | Loudspeaker vibration mode displacement control circuit and control method, and electronic equipment |
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| CN112804626A (en) * | 2020-12-30 | 2021-05-14 | 武汉市聚芯微电子有限责任公司 | Method and system for dynamically controlling amplitude of loudspeaker and mobile terminal |
| CN112804626B (en) * | 2020-12-30 | 2022-07-19 | 武汉市聚芯微电子有限责任公司 | Method and system for dynamically controlling amplitude of loudspeaker and mobile terminal |
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