CN105939509A - Detection system and method for loudspeaker - Google Patents
Detection system and method for loudspeaker Download PDFInfo
- Publication number
- CN105939509A CN105939509A CN201610404660.5A CN201610404660A CN105939509A CN 105939509 A CN105939509 A CN 105939509A CN 201610404660 A CN201610404660 A CN 201610404660A CN 105939509 A CN105939509 A CN 105939509A
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- China
- Prior art keywords
- loudspeaker
- frequency
- coil
- resistance value
- value
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R29/00—Monitoring arrangements; Testing arrangements
- H04R29/001—Monitoring arrangements; Testing arrangements for loudspeakers
- H04R29/003—Monitoring arrangements; Testing arrangements for loudspeakers of the moving-coil type
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- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
Abstract
The invention relates to a loudspeaker, and especially relates to a detection system and method for the loudspeaker. According to the system and the method, through calculation of a change rate of resistances, the problems such as low detection precision resulting from the differences of regulations of coils can be avoided well. According to the technical scheme, the loudspeaker is detected by comparing the change rate of resistances with a reference value, and therefore, the probability of misjudgment is reduced.
Description
Technical field
The present invention relates to a kind of loudspeaker, particularly relate to detecting system and the method for a kind of loudspeaker.
Background technology
Detection method to loudspeaker is typically to detect the resistance of the coil in loudspeaker at present,
If but owing to using same examination criteria to go out in the regulation of loudspeaker interior loop difference
The problems such as existing accuracy of detection is inadequate, thus the detection to loudspeaker carries out erroneous judgement, it is possible that
Coil is jumped out magnetic cylinder and be can not be detected or actual coil does not the most jump out magnet steel, but but detects
Go out coil and jump out the situations such as magnet steel.
Summary of the invention
The problem existed for prior art, now provides detecting system and the side of a kind of loudspeaker
Method.
Concrete technical scheme is as follows:
A kind of detecting system of loudspeaker, including:
Detection module, is connected with the coil in described loudspeaker, in order to obtain and to export described coil
The resistance value of each frequency；
Computing circuit, is connected with described detection module, in order to receive described resistance value, and root
Calculate the resistance change rate of the described coil of a frequency band according to described resistance value, export a value of calculation；
Comparison circuit, is connected with described computing circuit, in order to by described value of calculation and a reference value
Relatively, a comparative result is exported.
Preferably, described loudspeaker also include magnet steel, and described coil is arranged in described magnetic cylinder.
Preferably, described comparison circuit includes comparator.
Preferably, described frequency includes first frequency and second frequency, the line of described first frequency
The resistance value of circle is R1, and the resistance value of described second frequency is R2, described resistance change rate
Computing formula is (R2-R1)/R1.
Preferably, described detection module is by the voltage of described coil and flow through described coil
Electric current carries out FFT computing to obtain the resistance value of each frequency of described coil.
A kind of detection method of loudspeaker, including:
Step S1, the resistance value of each frequency of the coil in acquisition loudspeaker；
Step S2, calculates the resistance change rate of the described coil of a frequency band according to described resistance value,
Export a value of calculation；
Step S3, compares described value of calculation and a reference value, exports a comparative result.
Preferably, described loudspeaker also include magnet steel, and described coil is arranged in described magnetic cylinder.
Preferably, described loudspeaker are MEMS microphone.
Preferably, described frequency includes first frequency and second frequency, the line of described first frequency
The resistance value of circle is R1, and the resistance value of described second frequency is R2, described resistance change rate
Computing formula is (R2-R1)/R1.
Preferably, described step S1 specifically includes:
Step S11, voltage and the electric current flowing through described coil to described coil carry out FFT
Computing obtains the resistance value of each frequency of described coil.
Technique scheme provides the benefit that:
Technique scheme can preferably be evaded due to coil by calculating the rate of change of resistance
The problems such as the accuracy of detection difference that the difference of monomer regulation occurs, technique scheme is by by resistance
Rate of change and a reference value compare thus detect loudspeaker, reduce erroneous judgement and occur
Probability.
Accompanying drawing explanation
Fig. 1 is the structural representation of the embodiment of the detecting system of a kind of loudspeaker of the present invention；
Fig. 2 is the schematic diagram of the embodiment of the detection method of a kind of loudspeaker of the present invention.
Detailed description of the invention
It should be noted that in the case of not conflicting, following technical proposals, technical characteristic it
Between can be mutually combined.
Below in conjunction with the accompanying drawings the detailed description of the invention of the present invention is further described:
A kind of detecting system of loudspeaker, as it is shown in figure 1, include:
Detection module, is connected with the coil in loudspeaker, in order to obtain and each frequency of output winding
The resistance value of rate；
Computing circuit, is connected with detection module, in order to receive resistance value, and according to resistance value
Calculate the resistance change rate of the coil of a frequency band, export a value of calculation；
Comparison circuit, is connected with computing circuit, in order to value of calculation and a reference value to be compared, defeated
Go out a comparative result.
In the present embodiment, detection module, computing circuit, comparison circuit can be existing module
(or circuit), all can apply in the present embodiment as long as being capable of above-mentioned functions, this reality
Execute example be intended to protection be whole system modules (or circuit) between annexation,
The implementation of its inside modules can be realized by existing circuit mode, and the present embodiment is at this
Do not repeat.
Detection module in the present embodiment can include a circuit tester, and detection module passes through circuit tester
Europe mother's shelves survey the electricity that the resistance value of the coil of loudspeaker both would know that each frequency of coil
Resistance.Additionally, two or more data item can be compared by the comparison circuit in the present embodiment
Relatively, to determine that they are the most equal, or determine the magnitude relationship between them and the title that puts in order
For comparing.The circuit or the device that are capable of this comparing function are referred to as comparison circuit.Relatively
Circuit is a circuit analog voltage signal and a reference voltage compared.Comparison circuit
Two-way input for analogue signal, output is then binary signal, so detection module can be
One circuit tester.
In one preferred embodiment of the present invention, comparison circuit includes comparator.Further,
The comparison circuit of the present embodiment can
Computing circuit in above-described embodiment can calculate resistance value and the output resistance of input
Functional relationship between rate of change, the input/output relation of the computing circuit in the present embodiment, certainly
Due to feedback network, as long as choosing suitable feedback network, it is possible to the computing required for realization
Function, such as ratio, plus-minus, multiplication and division, calculus, logarithm etc..
In one preferred embodiment of the present invention, loudspeaker also include magnet steel, and coil is arranged at
In magnetic cylinder.
In one preferred embodiment of the present invention, the resistance value of the coil of described first frequency is
R1, the resistance value of described second frequency is R2, and the computing formula of described resistance change rate is
(R2-R1)/R1。
In one preferred embodiment of the present invention, detection module is by the voltage of coil and flowing through
The electric current of coil carries out FFT (Fast Fourier Transformation fast Fourier transform)
Computing is to obtain the resistance value of each frequency of coil.
In the present embodiment, detecting system also includes a FFT module, in order to by coil
The electric current of voltage and flowing through coil carries out FFT computing to obtain the resistance of each frequency of coil
Value.
The present embodiment additionally provides the detection method of a kind of loudspeaker, as in figure 2 it is shown, include:
Step S1, the resistance value of each frequency of the coil in acquisition loudspeaker；
Step S2, calculates the resistance change rate of the coil of a frequency band according to resistance value, exports one
Value of calculation；
Step S3, compares value of calculation and a reference value, exports a comparative result.
In one preferred embodiment of the present invention, loudspeaker also include magnet steel, and coil is arranged at
In magnetic cylinder.
In one preferred embodiment of the present invention, loudspeaker are MEMS microphone.
In one preferred embodiment of the present invention, the resistance value of the coil of described first frequency is
R1, the resistance value of described second frequency is R2, and the computing formula of described resistance change rate is
(R2-R1)/R1。
In one preferred embodiment of the present invention, step S1 specifically includes:
Step S11, carries out FFT computing acquisition to the voltage of coil and the electric current of flowing through coil
The resistance value of each frequency of coil.
In above-described embodiment, by detecting electric current and the voltage of the coil of each frequency, utilize one
FFT module calculates the resistance value of the coil of each frequency by FFT, by the meter of resistance value
Calculate formula and calculate the resistance change rate of multiple frequency ranges (frequency range), further, pass through
FFT computing calculates the rate of change of the resistance of the coil of multiple frequency ranges.
After the resistance change rate obtaining each frequency range of resistance, the resistance of each frequency range can be become
Rate contrasts with reference value, such as, carried out the comparison of size by a comparator, if electric
More than or less than reference value, resistive rate illustrates that the resistance of now coil is undergone mutation, coil may
Jump out magnetic cylinder, thus realize the detection to loudspeaker.
To sum up, technique scheme by calculate resistance rate of change can preferably evade due to
The problems such as the accuracy of detection difference that the difference of coil monomer regulation occurs, technique scheme is passed through will
Resistance change rate and a reference value compare thus detect loudspeaker, reduce erroneous judgement
The probability occurred.
By explanation and accompanying drawing, give typical case's enforcement of the ad hoc structure of detailed description of the invention
Example, based on present invention spirit, also can make other conversion.Although foregoing invention proposes existing
Preferred embodiment, but, these contents be not intended as limitation.
For a person skilled in the art, after reading described above, various changes and modifications
Will be apparent to undoubtedly.Therefore, appending claims should be regarded as and contains the true of the present invention
Sincere figure and whole variations and modifications of scope.In Claims scope any and all etc.
The scope of valency and content, be all considered as still belonging to the intent and scope of the invention.
Claims (10)
1. the detecting system of loudspeaker, it is characterised in that including:
Detection module, is connected with the coil in described loudspeaker, in order to obtain and to export described coil
The resistance value of each frequency；
Computing circuit, is connected with described detection module, in order to receive described resistance value, and root
Calculate the resistance change rate of the described coil of a frequency band according to described resistance value, export a value of calculation；
Comparison circuit, is connected with described computing circuit, in order to by described value of calculation and a reference value
Relatively, a comparative result is exported.
The detecting system of loudspeaker the most according to claim 1, it is characterised in that described
Loudspeaker also include magnet steel, and described coil is arranged in described magnetic cylinder.
The detecting system of loudspeaker the most according to claim 1, it is characterised in that described
Comparison circuit includes comparator.
The detecting system of loudspeaker the most according to claim 1, it is characterised in that described
Frequency includes that first frequency and second frequency, the resistance value of the coil of described first frequency are R1,
The resistance value of described second frequency is R2, and the computing formula of described resistance change rate is (R2-R1)
/R1。
The detecting system of loudspeaker the most according to claim 1, it is characterised in that described
Detection module is by carrying out FFT fortune to the voltage of described coil and the electric current flowing through described coil
Calculation is to obtain the resistance value of each frequency of described coil.
6. the detection method of loudspeaker, it is characterised in that including:
Step S1, the resistance value of each frequency of the coil in acquisition loudspeaker；
Step S2, calculates the resistance change rate of the described coil of a frequency band according to described resistance value,
Export a value of calculation；
Step S3, compares described value of calculation and a reference value, exports a comparative result.
The detection method of loudspeaker the most according to claim 6, it is characterised in that described
Loudspeaker also include magnet steel, and described coil is arranged in described magnetic cylinder.
The detection method of loudspeaker the most according to claim 6, it is characterised in that described
Loudspeaker are MEMS microphone.
The detection method of loudspeaker the most according to claim 6, it is characterised in that described
Frequency includes that first frequency and second frequency, the resistance value of the coil of described first frequency are R1,
The resistance value of described second frequency is R2, and the computing formula of described resistance change rate is (R2-R1)
/R1。
The detection method of loudspeaker the most according to claim 6, it is characterised in that described
Step S1 specifically includes:
Step S11, voltage and the electric current flowing through described coil to described coil carry out FFT fortune
Calculate the resistance value of each frequency obtaining described coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610404660.5A CN105939509A (en) | 2016-06-08 | 2016-06-08 | Detection system and method for loudspeaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610404660.5A CN105939509A (en) | 2016-06-08 | 2016-06-08 | Detection system and method for loudspeaker |
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| Publication Number | Publication Date |
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| CN105939509A true CN105939509A (en) | 2016-09-14 |
Family
ID=57152409
Family Applications (1)
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| CN201610404660.5A Pending CN105939509A (en) | 2016-06-08 | 2016-06-08 | Detection system and method for loudspeaker |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106658331A (en) * | 2016-12-30 | 2017-05-10 | 维沃移动通信有限公司 | Loudspeaker detection method and mobile terminal |
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| CN101296533A (en) * | 2007-12-29 | 2008-10-29 | 瑞声声学科技(常州)有限公司 | Loudspeaker diaphragm equivalent mass and equivalent force measuring method |
| CN104683927A (en) * | 2013-11-28 | 2015-06-03 | 恩智浦有限公司 | Determining the temperature of a loudspeaker voice coil |
| CN105307099A (en) * | 2015-11-11 | 2016-02-03 | 西安工程大学 | System for testing power of loudspeaker and method for testing power and low-frequency parameter |
| CN105594098A (en) * | 2014-02-28 | 2016-05-18 | 松下知识产权经营株式会社 | Embedded permanent magnet type electric motor, compressor, and refrigeration air-conditioning device |
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| CN101080946A (en) * | 2004-12-15 | 2007-11-28 | 摩托罗拉公司 | Speaker diagnostics based upon driving-point impedance |
| CN1761366A (en) * | 2005-08-18 | 2006-04-19 | 南京大学 | Method for measuring non-linear parameters of speaker unit based on system identification |
| US20070258598A1 (en) * | 2006-05-05 | 2007-11-08 | Bai Mingsian R | Method for parameter identification and parameter optimization of microspeakers |
| CN101217832A (en) * | 2007-12-29 | 2008-07-09 | 瑞声声学科技(常州)有限公司 | A measurement method of the equivalent mass and equivalent mechanical commutation compliance of the center suspension of speaker |
| CN101296533A (en) * | 2007-12-29 | 2008-10-29 | 瑞声声学科技(常州)有限公司 | Loudspeaker diaphragm equivalent mass and equivalent force measuring method |
| CN104683927A (en) * | 2013-11-28 | 2015-06-03 | 恩智浦有限公司 | Determining the temperature of a loudspeaker voice coil |
| CN105594098A (en) * | 2014-02-28 | 2016-05-18 | 松下知识产权经营株式会社 | Embedded permanent magnet type electric motor, compressor, and refrigeration air-conditioning device |
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| CN106658331A (en) * | 2016-12-30 | 2017-05-10 | 维沃移动通信有限公司 | Loudspeaker detection method and mobile terminal |
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Application publication date: 20160914 |