CN106954169B - Noise testing method and system for acoustic product - Google Patents
Noise testing method and system for acoustic product Download PDFInfo
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- CN106954169B CN106954169B CN201710169621.6A CN201710169621A CN106954169B CN 106954169 B CN106954169 B CN 106954169B CN 201710169621 A CN201710169621 A CN 201710169621A CN 106954169 B CN106954169 B CN 106954169B
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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
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Abstract
The invention discloses a noise test method and a system of an acoustic product, wherein the method comprises the following steps: before a driving unit in the acoustic product is sealed, acquiring a voltage value of the driving unit at the maximum amplitude; manufacturing a driving signal according to the voltage value; driving the driving unit by using the driving signal, and testing the higher harmonic distortion of the driving unit; analyzing the test result of the higher harmonic distortion to obtain a higher range of the higher harmonic distortion; setting an upper limit value of the total harmonic distortion percentage in the high-order range; and testing the higher harmonic distortion of the acoustic product to be tested, and judging the acoustic product to be unqualified when the total harmonic distortion percentage obtained in the higher-order range is higher than the upper limit value. According to the invention, by performing noise test on the semi-finished product of the acoustic product, whether the semi-finished product has tiny defects or not can be detected, the reliability of the finished product is improved, the service life of the finished product is prolonged, unqualified products can be removed in time, and the production cost is saved.
Description
Technical Field
The invention relates to the technical field of noise testing, in particular to a noise testing method and a noise testing system for an acoustic product.
Background
The acoustic product is in motion in a working state, and the semi-finished product is generally not subjected to acoustic detection in the production process, so that the product performance of the semi-finished product in the motion state cannot be judged. Small defects of the acoustic product are not easy to detect in the finished product stage, for example, the resonant frequency of the product changes, the maximum amplitude changes or slight wrinkles of the folded ring of the diaphragm can affect the performance of the acoustic product and the experience effect.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: a noise testing method and system for detecting fine defects of an acoustic product are provided.
In order to solve the technical problems, the invention adopts the technical scheme that:
a noise testing method for an acoustic product is provided,
before a driving unit in the acoustic product is sealed, acquiring a voltage value of the driving unit at the maximum amplitude;
manufacturing a driving signal according to the voltage value;
driving the driving unit by using the driving signal, and testing the higher harmonic distortion of the driving unit;
analyzing the test result of the higher harmonic distortion to obtain a higher range of the higher harmonic distortion;
setting an upper limit value of the total harmonic distortion percentage in the high-order range;
and testing the higher harmonic distortion of the acoustic product to be tested, and judging the acoustic product to be unqualified when the total harmonic distortion percentage obtained in the higher-order range is higher than the upper limit value.
The other technical scheme of the invention is as follows:
a noise testing system for acoustic products, comprising:
the acquisition module is used for acquiring a voltage value of the driving unit at the maximum amplitude before the driving unit in the acoustic product is sealed;
the manufacturing module is used for manufacturing a driving signal according to the voltage value;
the test module is used for driving the driving unit by using the driving signal and testing the higher harmonic distortion of the driving unit;
the analysis module is used for analyzing the test result of the higher harmonic distortion to obtain the higher range of the higher harmonic distortion;
the setting module is used for setting an upper limit value of the total harmonic distortion percentage in the high-order range;
and the judging module is used for testing the higher harmonic distortion of the acoustic product to be tested, and judging the acoustic product to be unqualified when the total harmonic distortion percentage obtained in the higher harmonic range is higher than the upper limit value.
The invention has the beneficial effects that: the method comprises the steps of carrying out high-order harmonic distortion test on a driving unit of an acoustic product before the driving unit is sealed, analyzing to obtain a high-order range of harmonic distortion, then setting an upper limit value of the percentage of total harmonic distortion in the high-order range of the harmonic distortion, and judging a product with the high-order harmonic distortion exceeding the upper limit value as a unqualified product when carrying out noise test on the driving units of other acoustic products. According to the invention, by performing noise test on the semi-finished product of the acoustic product, whether the semi-finished product has tiny defects or not can be detected, the reliability of the finished product is improved, the service life of the finished product is prolonged, unqualified products can be removed in time, and the production cost is saved.
Drawings
Fig. 1 is a flowchart of a noise testing method for an acoustic product according to a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of a noise testing system of an acoustic product according to a second embodiment of the present invention;
description of reference numerals:
1. an acquisition module; 2. manufacturing a module; 3. a test module; 4. an analysis module; 5. a setting module; 6. and a judging module.
Detailed Description
In order to explain technical contents, achieved objects, and effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.
The most key concept of the invention is as follows: before the driving unit of the acoustic product is sealed, the high-order harmonic distortion test is carried out on the driving unit, so that the small defects can be detected, the reliability of a finished product is improved, and the service life of the finished product is prolonged.
Referring to fig. 1, a noise testing method for acoustic products,
before a driving unit in the acoustic product is sealed, acquiring a voltage value of the driving unit at the maximum amplitude;
manufacturing a driving signal according to the voltage value;
driving the driving unit by using the driving signal, and testing the higher harmonic distortion of the driving unit;
analyzing the test result of the higher harmonic distortion to obtain a higher range of the higher harmonic distortion;
setting an upper limit value of the total harmonic distortion percentage in the high-order range;
and testing the higher harmonic distortion of the acoustic product to be tested, and judging the acoustic product to be unqualified when the total harmonic distortion percentage obtained in the higher-order range is higher than the upper limit value.
From the above description, the beneficial effects of the present invention are: before a driving unit of an acoustic product is sealed, a high-order harmonic distortion test is carried out on the driving unit, an upper limit value of the total harmonic distortion percentage is set in a high-order range, when the driving unit of a subsequent acoustic product is tested, only whether the total harmonic distortion percentage exceeds the upper limit value is judged, and the test method is simple, high in test efficiency and low in cost; and the high-order harmonic distortion of the driving unit is tested near the maximum amplitude of the driving unit, so that the slight nonlinear vibration of the driving unit can be captured, whether a semi-finished product has tiny defects or not can be detected, the reliability of the finished product is improved, the service life of the finished product is prolonged, unqualified products can be removed in time, and the production cost is saved.
Further, the driving unit is tested by adopting a continuous frequency sweeping signal, the amplitude of the driving unit is detected by utilizing a laser displacement testing method, and the voltage value of the driving unit at the maximum amplitude is obtained.
According to the description, the driving unit can be tested by adopting a high-density continuous sweep frequency signal, so that sampling points can be obtained, and the precision of a test result is improved; the laser displacement test method can be used for measuring the non-contact displacement, the laser method is high in test precision, and the measured maximum amplitude value is accurate.
Further, the driving signal is generated by using a ratio of 70% or more of the voltage value as the voltage value of the driving circuit.
From the above description, the frequency of the continuous sweep signal is gradually changed, while the frequency of the driving signal is kept unchanged, so that the amplitude of the driving unit can be ensured to be around the maximum amplitude when the voltage value of the driving circuit is 70% of the voltage value at the maximum amplitude.
Further, the ratio of 70% -80% of the voltage value is used as the voltage value of the driving circuit to produce the driving signal.
From the above description, it can be seen that making the drive signal with 70% -80% of the voltage value can produce pink noise for testing.
Further, the upper limit value is 0.5%.
As can be seen from the above description, the upper limit value may be set to 0.5%, and of course, the upper limit value may be adjusted to be larger or smaller according to specific situations.
Furthermore, after the upper limit value is set, a test frame line is set according to the high-order range and the upper limit value.
According to the description, the test frame line is arranged, so that the judgment of a tester is facilitated, and the test efficiency is improved.
Further, the frequency range of the continuous frequency sweeping signal is 100-2000 Hz.
Further, an output signal of the driving unit is obtained, and a test result of the high-order harmonic distortion is analyzed through a fast Fourier method according to the driving signal and the output signal.
According to the description, the test result is analyzed by adopting the fast Fourier method, so that the analysis efficiency is improved, and the time is saved.
Referring to fig. 2, another technical solution of the present invention is:
a noise testing system for acoustic products, comprising:
the acquisition module is used for acquiring a voltage value of the driving unit at the maximum amplitude before the driving unit in the acoustic product is sealed;
the manufacturing module is used for manufacturing a driving signal according to the voltage value;
the test module is used for driving the driving unit by using the driving signal and testing the higher harmonic distortion of the driving unit;
the analysis module is used for analyzing the test result of the higher harmonic distortion to obtain the higher range of the higher harmonic distortion;
the setting module is used for setting an upper limit value of the total harmonic distortion percentage in the high-order range;
and the judging module is used for testing the higher harmonic distortion of the acoustic product to be tested, and judging the acoustic product to be unqualified when the total harmonic distortion percentage obtained in the higher harmonic range is higher than the upper limit value.
Further, the obtaining module is specifically configured to test the driving unit by using a continuous frequency sweep signal, detect the amplitude of the driving unit by using a laser displacement test method, and obtain a voltage value of the driving unit at the maximum amplitude.
Further, the manufacturing module is used for manufacturing the driving signal by using a ratio which is greater than or equal to 70% of the voltage value as the voltage value of the driving circuit.
Further, the manufacturing module is used for manufacturing a driving signal by using the ratio of 70% -80% of the voltage value as the voltage value of the driving circuit.
Further, the setting module is configured to set an upper limit value of the total harmonic distortion percentage to 0.5%.
And the device further comprises a setting module which is used for setting a test frame line according to the high-order range and the upper limit value after the upper limit value is set.
Further, the frequency range of the continuous frequency sweeping signal adopted by the acquisition module is 100-2000 Hz.
Further, the analysis module is specifically configured to obtain an output signal of the driving unit, and analyze a test result of the high-order harmonic distortion by a fast fourier method according to the driving signal and the output signal.
Example one
Referring to fig. 1, a first embodiment of the present invention is: a noise test method of an acoustic product can be used for detecting defects of a driving unit of the acoustic product before the driving unit is packaged, and can detect small defects. The method mainly comprises the following steps:
and S1, acquiring the voltage value of the driving unit at the maximum amplitude before the driving unit in the acoustic product is sealed. The method specifically comprises the following steps: before the driving unit is sealed, testing the driving unit by using a continuous sweep frequency signal, detecting the amplitude of the driving unit by using a laser displacement testing method, and obtaining the voltage value of the driving unit at the maximum amplitude, wherein the voltage value can be obtained by Klippel. In this embodiment, the frequency range of the continuous frequency sweeping signal is 100-2000Hz, and the frequency variation range can be expanded or reduced, depending on the specific test situation. Preferably, the driving unit is tested by using a high-density continuous frequency sweeping signal, that is, more than 150 sampling points are ensured to exist in every 10 octaves, so that the obtained test result is more accurate.
And S2, generating a driving signal according to the voltage value. Preferably, the driving signal is generated by using a ratio of 70% or more of the voltage value as the voltage value of the driving circuit. Further preferably, the ratio of 70-80% of the voltage value is used as the voltage value of the driving circuit to produce the driving signal, so that the amplitude of the driving unit is ensured to be close to the maximum amplitude, the testing precision is improved, and the driving power can be controlled to a certain degree.
And S3, driving the driving unit by using the driving signal, and testing the higher harmonic distortion of the driving unit. The driving signal is input to the driving unit, and the difference between the output signal of the driving unit and the driving signal is tested, that is, the higher harmonic distortion of the output signal relative to the input signal is compared.
And S4, analyzing the test result of the high-order harmonic distortion to obtain the high-order range of the high-order harmonic distortion. The method specifically comprises the following steps: and acquiring an output signal of the driving unit, and analyzing a test result of the high-order harmonic distortion by a Fast Fourier Transform (FFT) method according to the driving signal and the output signal. In this embodiment, the difference between a defective product and a non-defective product can be determined by counting the test results of the driving units of a large number of products, and a higher-order range with a more obvious difference is selected as a reference range for determining whether the subsequent products are qualified.
And S5, setting the upper limit value of the total harmonic distortion percentage in the high-order range. The upper limit value may be set to 0.5%, or may be adjusted as appropriate according to a specific test condition. And after the upper limit value is set, setting a test frame line according to the high-order range and the upper limit value. To facilitate more clear identification by the tester, the test frame line may be set to red.
And S6, testing the higher harmonic distortion of the acoustic product to be tested, and judging as a defective product when the total harmonic distortion percentage obtained in the higher harmonic range is higher than the upper limit value. Because the testing frame line is arranged, whether the product is qualified or not is judged, and only whether the total harmonic distortion percentage of the product to be tested exceeds the testing frame line or not is judged, the product exceeding the testing frame line is judged to be a defective product, and the judging method is simple.
In the embodiment, the noise test is performed on the driving unit of the acoustic product before packaging, the test method is simple and reliable, the detection efficiency is high, whether the driving unit has tiny defects or not can be detected, the reliability of a finished product is improved, the service life of the finished product is prolonged, unqualified products can be removed in time, and the production cost is saved.
Example two
Referring to fig. 2, the second embodiment of the present invention is: a noise testing system for acoustic products, corresponding to the method, comprising:
the acquisition module 1 is used for acquiring a voltage value of a driving unit in the acoustic product at the maximum amplitude before the driving unit is sealed; the device is specifically used for testing the driving unit by adopting a continuous frequency sweeping signal, detecting the amplitude of the driving unit by utilizing a laser displacement testing method, and obtaining the voltage value of the driving unit at the maximum amplitude; the frequency range of the continuous frequency sweeping signal adopted by the acquisition module 1 is 100-2000 Hz;
the manufacturing module 2 is used for manufacturing a driving signal according to the voltage value; preferably, the driving circuit is used for generating a driving signal by adopting a ratio of more than or equal to 70% of the voltage value as the voltage value of the driving circuit; further preferably, the ratio of 70% -80% of the voltage value is used as the voltage value of the driving circuit to produce the driving signal;
the test module 3 is used for driving the driving unit by using the driving signal and testing the higher harmonic distortion of the driving unit;
the analysis module 4 is used for analyzing the test result of the higher harmonic distortion to obtain the higher range of the higher harmonic distortion; the device comprises a driving unit, a signal processing unit and a signal processing unit, wherein the driving unit is used for obtaining an output signal of the driving unit and analyzing a test result of high-order harmonic distortion by a fast Fourier method according to the driving signal and the output signal;
the setting module 5 is used for setting an upper limit value of the total harmonic distortion percentage in the high-order range; for example, the upper limit value of the total harmonic distortion percentage is set to 0.5%;
and the judging module 6 is used for testing the higher harmonic distortion of the acoustic product to be tested, and judging the acoustic product to be unqualified when the total harmonic distortion percentage obtained in the higher harmonic range is higher than the upper limit value.
In this embodiment, the apparatus further includes a setting module, configured to set a test frame line according to the high-order range and the upper limit value after the upper limit value is set.
In summary, the noise testing method and the noise testing system for the acoustic product provided by the invention have the advantages that the noise testing is performed on the driving unit of the acoustic product before packaging, the testing method is simple and reliable, the detection efficiency is high, whether the driving unit has tiny defects or not can be detected, the reliability of a finished product is improved, the service life of the finished product is prolonged, unqualified products can be removed in time, and the production cost is saved.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent changes made by using the contents of the present specification and the drawings, or applied directly or indirectly to the related technical fields, are included in the scope of the present invention.
Claims (8)
1. A noise testing method of acoustic products is characterized in that,
before a driving unit in the acoustic product is sealed, acquiring a voltage value of the driving unit at the maximum amplitude;
manufacturing a driving signal according to the voltage value;
driving the driving unit by using the driving signal, and testing the higher harmonic distortion of the driving unit;
analyzing the test result of the higher harmonic distortion to obtain a higher range of the higher harmonic distortion;
setting an upper limit value of the total harmonic distortion percentage in the high-order range;
testing the higher harmonic distortion of the acoustic product to be tested, and judging the acoustic product to be unqualified when the total harmonic distortion percentage obtained in the higher harmonic range is higher than the upper limit value;
and adopting the ratio of 70-80% of the voltage value as the voltage value of the driving circuit to produce a driving signal.
2. The method for testing the noise of an acoustic product according to claim 1, wherein the driving unit is tested by using a continuous frequency sweep signal, and the amplitude of the driving unit is detected by using a laser displacement test method, so as to obtain the voltage value of the driving unit at the maximum amplitude.
3. A method for testing the noise of an acoustic product according to claim 1 or 2, wherein said upper limit value is 0.5%.
4. The method of claim 1 or 2, wherein after the upper limit value is set, a test frame line is set according to the high-order range and the upper limit value.
5. The method as claimed in claim 2, wherein the frequency range of the continuous frequency sweep signal is 100-2000 Hz.
6. A method for testing the noise of an acoustic product according to claim 1 or 2, characterized in that the output signal of the drive unit is obtained, and the test result of the higher harmonic distortion is analyzed by means of fast fourier on the basis of the drive signal and the output signal.
7. A noise testing system for acoustic products, comprising:
the acquisition module is used for acquiring a voltage value of the driving unit at the maximum amplitude before the driving unit in the acoustic product is sealed;
the manufacturing module is used for manufacturing a driving signal according to the voltage value;
the test module is used for driving the driving unit by using the driving signal and testing the higher harmonic distortion of the driving unit;
the analysis module is used for analyzing the test result of the higher harmonic distortion to obtain the higher range of the higher harmonic distortion;
the setting module is used for setting an upper limit value of the total harmonic distortion percentage in the high-order range;
the judging module is used for testing the higher harmonic distortion of the acoustic product to be tested, and judging the acoustic product to be unqualified when the total harmonic distortion percentage obtained in the higher harmonic range is higher than the upper limit value;
the manufacturing module uses the ratio of 70% -80% of the voltage value as the voltage value of the driving circuit to manufacture the driving signal.
8. The system for testing the noise of an acoustic product according to claim 7, wherein the obtaining module is specifically configured to test the driving unit by using a continuous frequency sweep signal, and detect the amplitude of the driving unit by using a laser displacement test method, so as to obtain a voltage value of the driving unit at the maximum amplitude.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101600144A (en) * | 2008-11-27 | 2009-12-09 | 嘉兴中科声学科技有限公司 | Adopt continuous logarithm swept-frequency signal to obtain the method and system of a plurality of parameters of electro-acoustic product |
| CN104640054A (en) * | 2015-02-12 | 2015-05-20 | 广东欧珀移动通信有限公司 | Earphone/loudspeaker testing method and system for mobile terminal |
| CN204634044U (en) * | 2015-05-29 | 2015-09-09 | 东莞泰升音响科技有限公司 | Universal USB earphone semi-finished product function device for quick testing |
| CN105959892A (en) * | 2016-04-29 | 2016-09-21 | 歌尔股份有限公司 | Method and system used for testing loudspeakers |
| CN106068008A (en) * | 2016-08-15 | 2016-11-02 | 歌尔科技有限公司 | Audio-frequence player device distortion measurement method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9386386B2 (en) * | 2012-01-09 | 2016-07-05 | Actiwave Ab | System and method for audio enhancement of a consumer electronics device |
| CN105101032A (en) * | 2015-08-27 | 2015-11-25 | 深圳市音沃仕科技有限公司 | Acoustic testing method for electroacoustic transducer compound antenna module |
-
2017
- 2017-03-21 CN CN201710169621.6A patent/CN106954169B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101600144A (en) * | 2008-11-27 | 2009-12-09 | 嘉兴中科声学科技有限公司 | Adopt continuous logarithm swept-frequency signal to obtain the method and system of a plurality of parameters of electro-acoustic product |
| CN104640054A (en) * | 2015-02-12 | 2015-05-20 | 广东欧珀移动通信有限公司 | Earphone/loudspeaker testing method and system for mobile terminal |
| CN204634044U (en) * | 2015-05-29 | 2015-09-09 | 东莞泰升音响科技有限公司 | Universal USB earphone semi-finished product function device for quick testing |
| CN105959892A (en) * | 2016-04-29 | 2016-09-21 | 歌尔股份有限公司 | Method and system used for testing loudspeakers |
| CN106068008A (en) * | 2016-08-15 | 2016-11-02 | 歌尔科技有限公司 | Audio-frequence player device distortion measurement method |
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