CN102384821B - Loudspeaker module air tightness testing method, test fixture and test macro - Google Patents
Loudspeaker module air tightness testing method, test fixture and test macro Download PDFInfo
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- CN102384821B CN102384821B CN201110229108.4A CN201110229108A CN102384821B CN 102384821 B CN102384821 B CN 102384821B CN 201110229108 A CN201110229108 A CN 201110229108A CN 102384821 B CN102384821 B CN 102384821B
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Abstract
The invention provides the bubble-tight method of testing of a kind of loudspeaker module, test fixture and test macro, method of testing comprises: sound field loudspeaker module to be tested being placed in sealing; Obtain the Sensitirity va1ue of described loudspeaker module to be tested at preset frequency point; Judge that whether the impermeability of described loudspeaker module to be tested is qualified according to normal sensibility in the criterion of described preset frequency point and described Sensitirity va1ue.Utilize method of testing of the present invention and device, can carry out objective judgement fast to the impermeability of loudspeaker module, test result is more accurate and quantize.
Description
Technical field
The present invention relates to loudspeaker technical field of measurement and test, more specifically, relate to a kind of loudspeaker module air tightness testing method, test fixture and test macro.
Background technology
Along with the continuous increase of electronics market and improving constantly of product integrated level such as mobile phone, notebook, ultra-thin televisions, while the demand of loudspeaker module is constantly increased, higher requirement be it is also proposed to the performance of loudspeaker module.
Known, the casing of the loudspeaker module of conventional structure is generally surrounded by combinations such as gluing or ultra-sonic welded jointly by a upper casing and a lower casing, and upper casing is fixedly connected with one or several loudspeaker monomer by the mode such as gluing.Use the transducing type of loudspeaker monomer to be generally moving-coil type, also can adopt the loudspeaker monomer of piezoelectric type, electrostatic or other known transducing modes as required; Module box body type is generally closed, also can be designed to inverted phase type, 4 rank band general formulas, 6 rank band general formulas or other known casing types as required.In addition, on loudspeaker module also may other assemblies such as additional antenna to realize other performances required by it.
The loudspeaker module of this conventional structure, generally all sealing problem can be there is in actual production process, namely because the combination techniques such as gluing or ultra-sonic welded are bad or the reason of misoperation, make on module casing, form gap or other forms of poorly sealed region.
On loudspeaker module casing, the poorly sealed acoustics harm caused mainly contains two aspects: on the one hand, acoustic energy to module box internal radiation is outside to casing by the poorly sealed area radiation on module casing, cause sound leakage, the low frequency sensitivity of module is reduced, particularly when module box body forms resonance structure by other fabric connectivity in poorly sealed region and complete machine, larger infringement can be caused to performances such as the frequency responses of product; On the other hand, under the driving of loudspeaker acting force, the upper lower casing around gap can vibrate aggravation and mutually collides and produce noise, and air-flow produces the noises such as airflow noise when passing through gap, thus affects the audition of module.Especially the comparatively small gap that usual detection mode is not easily realized, after module installation, under continuing driving by the acting force produced housing during speaker operation, the poorly sealed gap meeting caused originally constantly becomes large, thus the acoustical behavior of complete machine is deteriorated gradually.Because symptom that this performance is bad is that product is sold and just slowly displayed long after, so just brings very large puzzlement to consumer, also have impact on the reputation of manufacturer.
In the air tightness test of loudspeaker, current common way is tested by wet lip, loudspeaker (as 0.5W) radiation frequency sweep sound or single-frequency sound under certain power is made (to be generally the frequency near resonance frequency, as 600Hz), tester comes inductive module surface with skin of lip to the more sensitive characteristic of air-flow, and whether detection sound leakage exists.This mode more effectively can detect the sound leakage of loudspeaker module.But this method needs to survey to lip the training that personnel carry out the long period usually, and is difficult to avoid erroneous judgement, particularly when lip surveys personnel's fatigue.The method is subjective testing, and the main experience relying on tester, is difficult to be applied among large-scale production.
Summary of the invention
In view of the above problems, the object of this invention is to provide a kind of bubble-tight method of testing and test fixture, test macro of objective and accurate loudspeaker module.
According to an aspect of the present invention, provide a kind of loudspeaker module air tightness testing method, comprising:
Loudspeaker module to be tested is placed in airtight sound field;
Obtain the Sensitirity va1ue of described loudspeaker module to be tested at preset frequency point;
Judge that whether the impermeability of described loudspeaker module to be tested is qualified according to normal sensibility in the criterion of described preset frequency point and described sensitivity difference.
Wherein, described normal sensibility is that the mode of carrying out air tightness test by the loudspeaker module good to the impermeability of regulation number of samples obtains in the criterion of described preset frequency point, and detailed process comprises:
Sampling loudspeaker module good for impermeability is placed in airtight sound field;
Obtain the Sensitirity va1ue of each sampling loudspeaker module at described preset frequency point respectively;
The criterion of described normal sensibility at described preset frequency point is determined according to the described Sensitirity va1ue of all sampling loudspeaker modules.
In addition, preferably, described method also comprises:
Obtain the Sensitirity va1ue of described loudspeaker module to be tested at another preset frequency point;
Calculate the sensitivity difference of described loudspeaker module to be tested between described different preset frequency point;
Judge that whether the impermeability of described loudspeaker module to be tested is qualified according to normal sensibility in the difference criterion of described different preset frequency point and described sensitivity difference.
Wherein, described normal sensibility is that the mode of carrying out air tightness test by the loudspeaker module good to the impermeability of regulation number of samples obtains in the difference criterion of described different preset frequency point, and detailed process comprises:
Sampling loudspeaker module good for impermeability is placed in airtight sound field;
Obtain the Sensitirity va1ue of each sampling loudspeaker module at described different preset frequency point respectively;
Calculate the sensitivity difference of each sampling loudspeaker module at described different preset frequency point;
The difference criterion of described normal sensibility at described different preset frequency point is determined according to the described sensitivity difference of all sampling loudspeaker modules.
According to a further aspect in the invention, provide a kind of loudspeaker module air tightness test frock, comprising:
Closed sound box system, comprise provide the loudspeaker unit of measuring sound source and with the ante-chamber of described loudspeaker unit cooperating and back cavity, for providing airtight sound field for loudspeaker module to be tested;
Box sealing frock, for being sealed in described loudspeaker module to be tested in described closed sound box system.
In addition, preferred scheme is, is provided with the network for supporting described sound source to be tested in the ante-chamber of described audio amplifier closed sound box system.
In addition, preferably, described network to be fixed on before described closed sound box system on cavity wall by buffer rubber gasket.
Moreover preferred scheme is, described box sealing frock comprises support, jacking gear, stationary installation and gland bonnet, wherein,
Described jacking gear is arranged on the bracket, moves in vertical direction along guide rail;
Stationary installation, is arranged on described jacking gear, and is fixedly connected with described gland bonnet, for driving described gland bonnet closure or openness when described jacking gear moves up and down;
Described gland bonnet seals the ante-chamber of described closed sound box system by described stationary installation.
In addition, preferably, seal contact position at the ante-chamber of described gland bonnet and described closed sound box system and be provided with the sealing strip that rubber ring or compressible material form.
In accordance with a further aspect of the present invention, provide a kind of loudspeaker module tightness test system, comprise audio analyzer, power amplifier, measuring amplifier and above-mentioned loudspeaker module air tightness test frock, wherein, described power amplifier is arranged between the output terminal of described audio analyzer and the input end of described closed sound box system, flows to the loudspeaker unit in described closed sound box system after the frequency signal for exporting described audio analyzer carries out power amplification;
Between the output terminal that described measuring amplifier is arranged on described closed sound box system and the input end of described audio analyzer, carry out gain amplification for the Sensitirity va1ue exported the loudspeaker module to be tested be sealed in described closed sound box system;
Described audio analyzer is used for providing the frequency signal of preset frequency point or the swept-frequency signal of scheduled frequency range for described closed sound box system; And obtain the Sensitirity va1ue of described measuring amplifier output, and determine that whether the impermeability of described loudspeaker module to be tested is qualified according to described Sensitirity va1ue.
In addition, preferred scheme is, described audio analyzer comprises data processing unit, described data processing unit according to described loudspeaker module to be tested in the Sensitirity va1ue of preset frequency point or the sensitivity difference at different preset frequency point, by comparing to judge that whether the impermeability of described loudspeaker module to be tested qualified in the criterion of described preset frequency point or in the difference criterion of described different preset frequency point from normal sensibility.
In addition, preferred scheme is, described measuring amplifier is multiple, between the output terminal being separately positioned on described closed sound box system and the input end of described audio analyzer, carry out gain amplification for the Sensitirity va1ue exported the loudspeaker module multiple to be tested be sealed in described closed sound box system.
In addition, preferred scheme is, the span of the frequency of the sound field in described closed sound box system is 10Hz ~ 100Hz, and the value of sound pressure level is 100dBSPL ~ 140dBSPL.
Be compared to prior art, utilize loudspeaker module air tightness testing method of the present invention and device, can carry out objective judgement fast to whether the impermeability of loudspeaker module is qualified, test result is more accurate and quantize.
In order to realize above-mentioned and relevant object, will describe in detail and the feature particularly pointed out in the claims after one or more aspect of the present invention comprises.Explanation below and accompanying drawing describe some illustrative aspects of the present invention in detail.But what these aspects indicated is only some modes that can use in the various modes of principle of the present invention.In addition, the present invention is intended to comprise all these aspects and their equivalent.
Accompanying drawing explanation
By reference to the content below in conjunction with the description of the drawings and claims, and understand more comprehensively along with to of the present invention, other object of the present invention and result will be understood and easy to understand more.In the accompanying drawings:
Fig. 1 is the external view of the loudspeaker module test device for air tightness that the embodiment of the present invention relates to;
Fig. 2 is the sectional view of the loudspeaker module test device for air tightness that the embodiment of the present invention relates to;
Fig. 3 is according to the loudspeaker module air tightness testing method testing process schematic diagram of the embodiment of the present invention one;
Fig. 4 is the loudspeaker module impermeability sampling schematic flow sheet according to the embodiment of the present invention one;
Fig. 5 is the instrument and equipment block diagram of the loudspeaker module tightness test system according to the embodiment of the present invention;
Fig. 6 is the instrument and equipment block diagram of loudspeaker module tightness test system according to another embodiment of the present invention;
Fig. 7 is the schematic flow sheet of the loudspeaker module air tightness testing method according to the embodiment of the present invention two;
Fig. 8 is the loudspeaker module impermeability sampling schematic flow sheet according to the embodiment of the present invention two.
In figure:
100 loudspeaker module air tightness test frock 500 loudspeaker module tightness test systems
10 closed sound box systems; 11 loudspeaker units;
The back cavity of 12 closed sound box systems 10; The ante-chamber of 13 closed sound box systems 10;
20 box sealing frocks; 21 supports;
22 jacking gears; 23 stationary installations;
24 gland bonnets; 25 sealing strips;
31 loudspeaker modules to be tested; 32 networks;
33 rubber blankets; 51 audio-frequency test instrument;
52 power amplifiers; 53 measuring amplifiers;
Embodiment
Below in conjunction with the drawings and specific embodiments, further detailed description is done to the present invention.
In the following description, mode only by illustrating is described some example embodiment of the present invention, undoubtedly, those of ordinary skill in the art can recognize, when without departing from the spirit and scope of the present invention, can revise described embodiment with various different modes.Therefore, accompanying drawing and be described in just illustrative in essence, instead of for limiting the protection domain of claim.In addition, in this manual, identical Reference numeral indicates identical part.
The present invention is to provide a kind of air tightness testing method of loudspeaker module, test fixture and test macro, below in the statement of the embodiment of the present invention, the closed that the loudspeaker module box body type tested adopts usually, the coil-moving speaker that loudspeaker monomer type adopts usually.Undoubtedly, other casing types (as inverted phase type, band general formula) and carry out air tightness test with the principle that the loudspeaker module that other principles such as such as piezoelectric type carry out the monomer type of work also can be set forth according to following embodiment.
Embodiment one
Fig. 3 is the loudspeaker module air tightness testing method testing process schematic diagram according to the embodiment of the present invention one.
As shown in Figure 3, the flow process utilizing the loudspeaker module air tightness test frock shown in Fig. 1 and Fig. 2 to carry out loudspeaker module air tightness test comprises the following steps:
S310: loudspeaker module to be tested is placed in airtight sound field;
S320: obtain the Sensitirity va1ue of loudspeaker module to be tested at preset frequency point;
S330: judge that whether the impermeability of loudspeaker module to be tested is qualified in the criterion of preset frequency point and above-mentioned Sensitirity va1ue according to normal sensibility.
By this test mode, in normal test process, if the impermeability of loudspeaker module to be tested is good, then carry out work as pressure type microphone.When there is sound leakage in loudspeaker module, sound wave can act on the back side of the vibrating diaphragm of loudspeaker module to be tested by sound leakage, in this case loudspeaker module to be tested is as differential (or pressure pressure reduction is hybrid) microphone works, and now the low frequency sensitivity of loudspeaker module to be tested can reduce.Compared by the sensitivity that obtains and normal sensibility criterion, can judge that whether the impermeability of loudspeaker module to be tested is qualified.This mode accurately, fast, can be applied to producing in enormous quantities.
For this method of testing, the mode that above-mentioned normal sensibility criterion carries out air tightness test by the loudspeaker module good to the impermeability of regulation number of samples obtains, similar with the flow process shown in Fig. 3 to the process of the sampling test of each sampling loudspeaker module, specifically as shown in Figure 4:
S410: sampling loudspeaker module good for impermeability is placed in airtight sound field;
S420: obtain the Sensitirity va1ue of each sampling loudspeaker module at preset frequency point respectively;
S430: the normal sensibility criterion determining described preset frequency point according to all sampling loudspeaker modules in the sensitivity of above-mentioned preset frequency point.
In addition, in order to avoid the test signal of reality or sampled signal too weak and harmful effect is produced to final loudspeaker module air tightness test result, at each sampling loudspeaker module of acquisition and loudspeaker module to be tested after the Sensitirity va1ue of preset frequency point, also need to utilize amplifier to carry out to obtained Sensitirity va1ue amplifications and process; Then judge that whether the impermeability of this loudspeaker module to be tested is qualified according to amplifying the Sensitirity va1ue after processing.
This mode that the present embodiment one provides can obtain Sensitivity Criterion accurately, thus can judge the impermeability of loudspeaker module to be measured accurately.
Present invention also offers loudspeaker module air tightness test frock, Fig. 1 and Fig. 2 is outward appearance and the schematic cross-section of the loudspeaker module air tightness test frock that the present invention relates to respectively.
As depicted in figs. 1 and 2, loudspeaker module air tightness test frock 100 provided by the invention comprises closed sound box system 10 and box sealing frock 20.Wherein, closed sound box system 10 is by its airtight sound field for loudspeaker module to be tested and sampling loudspeaker module provide the test environment of predetermined frequency and predetermined sound pressure level, and in order to the convenience of testing, this sound field is high sound pressure low frequency sound field; Further, in test process, closed sound box system 10 is closed structure.Box sealing frock 20 is for being sealed in the sound field of closed sound box system 10 by loudspeaker module to be tested and sampling loudspeaker module, with make loudspeaker module to be tested or need the loudspeaker module of sampling can in the environment that sealing is good acceptance test and not by the impact of other noise in environment, guarantee the accuracy of testing.This test fixture is equally for the collection of the normal sensibility criterion of loudspeaker module of sampling.
In the embodiment shown in Fig. 1 and Fig. 2, the structure of closed sound box system 10 comprises ante-chamber 13, back cavity 12, wherein, the loudspeaker unit 11 being used to provide measuring sound source is provided with in back cavity 12, the phonate hole of loudspeaker unit 11, towards ante-chamber 13, is provided with the network 32 for supporting loudspeaker module to be tested and sampling loudspeaker module in ante-chamber 13.
Box sealing frock 20 comprises support 21, jacking gear 22, stationary installation 23 and gland bonnet 24.Wherein, jacking gear 22 is installed on the stent 21, can move in vertical direction along guide rail.Jacking gear 22 can be the jacking gear of cylinder jacking gear or other physical constructions, by the driving of cylinder or other mechanical systems, elevating lever is moved up and down in vertical direction along guide rail, stationary installation 23 is arranged on jacking gear 22, and is fixedly connected with gland bonnet 24; For driving gland bonnet 24 closure or openness when jacking gear moves up and down.Gland bonnet 24 is opened by the driving of stationary installation 23 or is closed the ante-chamber 13 placing loudspeaker module to be tested.
In test process, loudspeaker module to be tested is placed on the network 32 of ante-chamber 13, then the acting force by box sealing frock 20 utilizes gland bonnet 24 to be sealed by ante-chamber 13, now in closed sound box system 10, just defines a confined space for testing.Loudspeaker unit 11 according to the input of external control signal with predetermined resonance frequency sounding, in ante-chamber 13, become the high sound pressure low frequency sound field of preset frequency and predetermined sound pressure level, loudspeaker module to be tested produces the sensitivity signal of test under the effect of this sound field.
For the loudspeaker module of closed, general in order to make average pressure and around atmospheric pressure in chamber keep balancing, with the casing inside and outside differential pressure avoiding temperature or other factors to cause, loudspeaker is caused damage, usually balancing orifice can be offered on housing, the size of balancing orifice needs very little, as 0.3mm aperture, and also need to cover sound-resistance material to avoid balancing orifice to module acoustical behavior generation harmful effect on balancing orifice.Therefore, under normal circumstances, the effect of balancing orifice is only limitted to atmospheric pressure inside and outside balanced module box body, small-sized, and has sound-resistance material to cover, and its sound leakage produced can be ignored.
In normal test process, if the impermeability of loudspeaker module 31 to be tested is good, then carry out work (not considering the sound leakage that balancing orifice produces) as pressure type microphone.When there is sound leakage in loudspeaker module, sound wave can act on the back side of the vibrating diaphragm of loudspeaker module to be tested by sound leakage, in this case loudspeaker module to be tested is as differential (or pressure pressure reduction is hybrid) microphone works, now the low frequency sensitivity of loudspeaker module to be tested can reduce, and can be judged the impermeability of loudspeaker module by this change.
Can find out according to the method for testing of above-mentioned case study on implementation one and corresponding test fixture, carry out in the process of the performing leak test of loudspeaker module in application technology of the present invention, on the basis determining standard criterion, only need closed sound box system loudspeaker module to be tested being placed in test fixture, just can carry out objective judgement fast to whether the impermeability of loudspeaker module is qualified easily, test technology is simple, test result is more accurate and quantize, and is conducive to improving testing efficiency.
Embodiment two
In this embodiment two, still adopt the test fixture adopted in embodiment one, but improved in method of testing, comprise the following steps:
Loudspeaker module to be tested is placed in airtight sound field;
Obtain the Sensitirity va1ue of described loudspeaker module to be tested at different preset frequency point;
Calculate the sensitivity difference of described loudspeaker module to be tested at described different preset frequency point;
Judge that whether the impermeability of loudspeaker module to be tested is qualified according to normal sensibility in the difference criterion of above-mentioned different preset frequency point and above-mentioned sensitivity difference.
Similarly, the mode that normal sensibility carries out air tightness test in the difference criterion of different preset frequency point by the loudspeaker module good to the impermeability of regulation number of samples obtains, and detailed process comprises:
Sampling loudspeaker module good for impermeability is placed in airtight sound field;
Obtain the Sensitirity va1ue of each sampling loudspeaker module at above-mentioned different preset frequency point respectively;
Calculate the sensitivity difference of each sampling loudspeaker module at above-mentioned different preset frequency point;
According to the sensitivity difference confirmed standard sensitivity of all sampling loudspeaker modules difference criterion at different preset frequency point.
With embodiment one unlike, in the present embodiment two, utilize the sensitivity difference of different preset frequency point to substitute the Sensitirity va1ue of a certain preset frequency point as judging the foundation whether loudspeaker module to be tested qualified.
Particularly, exemplarily, utilize above-mentioned test fixture to carry out the flow process of loudspeaker module air tightness test as shown in Figure 7 according to the air tightness testing method shown in this embodiment two, comprising:
S710: airtight sound field loudspeaker module to be tested being placed in closed sound box system;
S720: formed the sound field with predetermined frequency and predetermined sound pressure level by the sound source in closed sound box system;
S730: obtain the sensitivity difference of loudspeaker module to be tested between different preset frequency point;
S740: judge that whether the impermeability of this loudspeaker module to be tested is qualified in the difference criterion of above-mentioned different preset frequency point and loudspeaker module to be tested in the Sensitirity va1ue difference criterion of above-mentioned different preset frequency point according to normal sensibility.
Wherein, the mode that normal sensibility criterion carries out air tightness test by the loudspeaker module good to the impermeability of regulation number of samples obtains, similar with the flow process shown in Fig. 7 to the process of the sampling test of each sampling loudspeaker module, specifically as shown in Figure 8:
S810: airtight sound field sampling loudspeaker module being placed in closed sound box system;
S820: formed the sound field with predetermined frequency and predetermined sound pressure level by the sound source in closed sound box system;
S830: obtain the Sensitirity va1ue of sampling loudspeaker module at different preset frequency point;
S840: calculating sampling loudspeaker module is in the sensitivity difference of different preset frequency point;
S850: judge whether, by complete for all sampling loudspeaker module samplings, if do not had, then to repeat the sampling of step S810 ~ S840; Complete if sampled, then go to step S860;
S860: according to the sensitivity difference confirmed standard sensitivity of all sampling loudspeaker modules difference criterion at different preset frequency point.According to this method of testing of embodiment two, under the prerequisite that sound field remains unchanged, the degree harmony leakiness that low frequency sensitivity reduces is directly proportional, and namely sound leakage degree is larger, and it is more that low frequency sensitivity reduces.The degree that so just can be reduced by test low frequency sensitivity, judge that whether the impermeability of loudspeaker module to be tested is qualified, also namely by calculating the sensitivity difference of different frequency point, the impermeability degree treating test loudspeaker module judges, calculate the sensitivity difference of different frequency point, difference is larger, illustrates that the sound leakage degree of loudspeaker module to be tested is larger, in this, as judging the foundation whether loudspeaker module impermeability to be tested is qualified.
In above-mentioned case study on implementation, the Frequency point of preset frequency can be chosen within the scope of 10Hz ~ 100Hz, and sound pressure level can be chosen within the scope of 100dBSPL ~ 140dBSPL.In above-mentioned case study on implementation, closed sound box system 10 preferably adopts the super-bass loudspeaker box system of resonance frequency low-down (as 10Hz or 20Hz), and resonance frequency is lower, and air tightness test sensitivity is higher, and the leak that therefore can detect is less.
Because loudspeaker module 31 to be tested is placed on network 32 acceptance test, grid on network 32 can reduce the impact of this support on test environment as far as possible, can remain unchanged to make measuring sound source in the process being arrived loudspeaker module 31 to be tested by network 32.In addition, when testing to reduce as far as possible, casing vibrates the impact caused network 32, can be fixedly connected with by the inwall of network 32 with ante-chamber 13 by the rubber blanket 33 (as shown in Figure 2) with pooling feature.Certainly, other feasible buffering methods also can be adopted to fix network.
Loudspeaker module 31 to be tested is placed on acceptance test on network 32, according to the size of ante-chamber 13 volume, depending on concrete condition, network 32 can be installed one or several loudspeaker module 31 to be tested, the quantity of the loudspeaker module 31 of each test can be one or more.In order to ensure measuring accuracy, loudspeaker module casing to be tested is except gravity, and substantially no longer by the effect of other external force, and the position easily occurring to leak is not subject to anyly may affecting blocking of test result.
In addition, because gland bonnet 24 is that this closed sound box system 10 uniquely needs carry out taking and putting measured examination loudspeaker module by open and close and seal the assembly of closed sound box system, therefore, in order to make ante-chamber 13, there is good impermeability, the sealing strip 25 be made up of rubber blanket or other compressible materials is added, to increase the airtight effect of gland bonnet 24 pairs of ante-chambers 13 between the outer wall that gland bonnet 24 and ante-chamber 13 contact with seal cap sealing.
In Test Application process, jacking gear 22 coordinates with stationary installation 23 to be installed, to gland bonnet 24 suitably pressure, to make between gland bonnet 24 and ante-chamber 13 outer wall compact siro spinning technology more, because if the impermeability of gland bonnet 24 and ante-chamber 13 is bad, the impermeability of closed sound box system 10 can be affected, and then affect test result, make test become unstable.If repeatedly test, require that the difference of test result is within the scope of measuring error, in an embodiment of the invention, if error is within ± 0.03dB, is just considered as gland bonnet 24 and meets the demands with ante-chamber 13 outer wall impermeability.Certainly, sound leakage degree also can affect air tightness test result, when sound leakage large to a certain extent time, test likely can become unstable, and the difference of twice test result may exceed the scope of measuring error, should be noted that during the actual debugging of this point.
Embodiment three
Fig. 5 is the instrument and equipment block diagram of embodiment of the present invention loudspeaker module tightness test system.
As shown in Figure 5, loudspeaker module tightness test system 500 provided by the invention comprises audio analyzer 51, power amplifier 52, measuring amplifier 53 and aforementioned speakers module air tightness test frock 100.
Wherein, power amplifier 52 is arranged between the input end of the output terminal of audio analyzer 51 and the closed sound box system of loudspeaker module air tightness test frock 100, between the output terminal that measuring amplifier 53 is arranged on the closed sound box system of loudspeaker module air tightness test frock 100 and the input end of audio analyzer 51.
Audio analyzer 51 for providing the frequency signal of preset frequency point or the swept-frequency signal of scheduled frequency range for closed sound box system 10, to form the sound field of arbitrarily downgrading of predetermined frequency and predetermined sound in closed sound box system; And obtain the loudspeaker module to be tested be sealed in closed sound box system that measuring amplifier 53 exports form the sound field of arbitrarily downgrading of predetermined frequency and predetermined sound within the system under the Sensitirity va1ue that produces, and then determine that whether the impermeability of loudspeaker module to be tested is qualified according to this Sensitirity va1ue, can select known as Soundcheck, Audio Precision or other system in the industry.Power amplifier 52 carries out power amplification for the frequency signal exported audio analyzer 51, then the frequency signal after amplification is flowed to the loudspeaker unit in closed sound box system, to form the sound field of preset frequency and predetermined sound pressure level in closed sound box system; Measuring amplifier 53 carries out gain amplification for the Sensitirity va1ue exported the loudspeaker unit to be tested be sealed in closed sound box system.
Wherein, audio analyzer comprises data processing unit (not shown), this data processing unit according to loudspeaker module 31 to be tested in the Sensitirity va1ue of preset frequency point or the sensitivity difference at different preset frequency point, by comparing to judge that whether the impermeability of this loudspeaker module to be tested qualified from normal sensibility in the criterion of above-mentioned preset frequency point or in the difference criterion of above-mentioned different preset frequency point.
Particularly, exemplarily, after known calibration is carried out to the sound field of ante-chamber 13, swept-frequency signal exports to closed sound box system 10 by audio analyzer 51 via specifying the power amplifier 52 of gain amplifier, ante-chamber 13 forms the sound field of specifying sound pressure level assigned frequency, sampling or loudspeaker module 31 to be tested to be positioned in ante-chamber 13 as microphones sound field and to produce corresponding signal, the output signal that sampling or loudspeaker module 31 to be tested produce passes to audio analyzer 51 by specifying the measuring amplifier 53 of gain, audio analyzer 51 provides test result through specifying computing.
In the test process of reality, according to the connected mode assembling test system shown in Fig. 5, and loudspeaker module 31 to be tested is placed on network 32, thus is placed in the high sound pressure low frequency sound field environment that closed sound box system 10 produces in ante-chamber 13.The sound field with preset frequency and predetermined sound pressure level that closed sound box system 10 produces is key of the present invention, which determine the bubble-tight measurement sensitivity of loudspeaker module, under the prerequisite that system satisfies condition, the sound pressure level of sound field is higher, low-limit frequency is lower, measurement sensitivity is higher, therefore, and the sound field of preferred high sound pressure, low frequency.
Predetermined frequency can be selected within the scope of 10Hz ~ 100Hz, and predetermined sound pressure level can within the scope of 100dBSPL ~ 140dBSPL.In one particular embodiment of the present invention, adopt the swept-frequency signal be made up of 10Hz and 20Hz two frequencies, export to closed sound box system 10, sound box system 10 produces in ante-chamber 13 that frequency is 10Hz and 20Hz, sound pressure level is 130dBSPL sound field.In this case, loudspeaker module to be tested, as the moving-coil microphone on ordinary meaning, receives sound field that enclosure-type sound box system 10 produces and produces the sensitivity of corresponding frequencies.Due to loudspeaker module to be tested as moving-coil microphone works time, sensitivity usually can be lower, and when especially sound leakage degree is larger, in order to meet the requirement of signal to noise ratio (S/N ratio), the gain of usual measuring amplifier is comparatively large, as 40dB.
Below with one according to sampling loudspeaker module confirmed standard sensitivity difference criterion, treat the complete implementation procedure that test loudspeaker carries out air tightness test more deep explanation carried out to the present invention.
A. loudspeaker module good for the impermeability as sampling loudspeaker module is positioned in ante-chamber 13;
B. utilize box sealing frock 20 to be sealed by closed sound box system 10, wherein audio analyzer 41 sends the test signal of preset frequency, and test signal inputs closed sound box system 10 and works after power amplifier amplifies; Sound source loudspeaker unit 11 in closed sound box system 10 forms assigned frequency according to the test signal of amplifying and specifies the sound field of sound pressure level in ante-chamber 13, test out the frequency response curve of sampling sound device module as microphone works, and calculate the sensitivity difference between assigned frequency point;
C. repeat a, b step, the sampling loudspeaker module of test sufficient amount, make the normal sensibility difference criterion judging the assigned frequency point whether impermeability is qualified;
D. loudspeaker module 31 to be tested is placed in ante-chamber 13, tests, judge that whether impermeability is qualified according to the sensitivity difference criterion between assigned frequency point.
In this implementation process, preferred example, the resonance frequency of closed sound box system 10 is 10Hz, and closed sound box system generation frequency is 10Hz and 20Hz, sound pressure level is the sound field of 130dBSPL, in order to improve the output signal-to-noise ratio of loudspeaker module, the gain of measuring amplifier is 40dB.By implementing the technical scheme in the present embodiment, can according to the impermeability difference of the different loudspeaker modules calculated efficiently, technique is more easy, and it is more accurate to judge.
In the above-described embodiments, as long as loudspeaker module to be tested is placed in sound field, just can test according to the impermeability of test technology provided by the present invention to loudspeaker module; Low-frequency sound source is only preferred embodiment; The linked manner of proving installation and sound box system 10 building form etc. also can improve, and neither affect the enforcement of the invention, all can realize above-mentioned technique effect.
Can also be improved for the implementation case, measuring amplifier is set to multiple, between the output terminal being separately positioned on closed sound box system and the input end of audio analyzer, amplify for the Sensitirity va1ue exported the loudspeaker module multiple to be tested be sealed in closed sound box system.
Fig. 6 is the instrument and equipment block diagram of loudspeaker module tightness test system according to another embodiment of the present invention.As shown in Figure 6, by arranging multiple measuring amplifier 53, the impermeability of multiple loudspeaker module 31 can be measured simultaneously, certainly, also can measure sampling loudspeaker module simultaneously, can testing efficiency be improved in this way.
As above, describe in an illustrative manner according to loudspeaker module air tightness testing method of the present invention, test fixture and test macro with reference to accompanying drawing.But; those skilled in the art are to be understood that; for method of testing, test fixture and test macro that the invention described above proposes; various improvement and distortion can also be made on the basis not departing from content of the present invention; and these improve and distortion, all drop in protection scope of the present invention, those skilled in the art should be understood that; above-mentioned specific descriptions just better explain object of the present invention, and protection scope of the present invention is by claim and equivalents thereof.
Claims (12)
1. a loudspeaker module tightness test system, comprises audio analyzer, power amplifier, measuring amplifier and loudspeaker module air tightness test frock, wherein,
Described loudspeaker module air tightness test frock comprises:
Closed sound box system, comprise provide the loudspeaker unit of measuring sound source and with the ante-chamber of described loudspeaker unit cooperating and back cavity, for providing airtight sound field for loudspeaker module to be tested;
Box sealing frock, for described loudspeaker module to be tested is sealed in described closed sound box system,
Described power amplifier is arranged between the output terminal of described audio analyzer and the input end of described closed sound box system, flows to the loudspeaker unit in described closed sound box system after the frequency signal for exporting described audio analyzer carries out power amplification;
Between the output terminal that described measuring amplifier is arranged on described closed sound box system and the input end of described audio analyzer, carry out gain amplification for the Sensitirity va1ue exported the loudspeaker module to be tested be sealed in described closed sound box system;
Described audio analyzer is used for providing the frequency signal of preset frequency point or the swept-frequency signal of scheduled frequency range for described closed sound box system; And obtain the Sensitirity va1ue of described measuring amplifier output, and determine that whether the impermeability of described loudspeaker module to be tested is qualified according to the Sensitirity va1ue that described measuring amplifier exports,
Wherein, described box sealing frock comprises support, jacking gear, stationary installation and gland bonnet, wherein,
Described jacking gear is arranged on the bracket, moves in vertical direction along guide rail;
Stationary installation, is arranged on described jacking gear, and is fixedly connected with described gland bonnet, for driving described gland bonnet closure or openness when described jacking gear moves up and down;
Described gland bonnet seals the ante-chamber of described closed sound box system by described stationary installation.
2. loudspeaker module tightness test system as claimed in claim 1, wherein, is provided with the network for supporting described loudspeaker module to be tested in the ante-chamber of described closed sound box system.
3. loudspeaker module tightness test system as claimed in claim 2, wherein,
Described network is fixed on by buffer rubber gasket on the inwall of the ante-chamber of described closed sound box system.
4. loudspeaker module tightness test system as claimed in claim 1, wherein,
Seal contact position at the ante-chamber of described gland bonnet and described closed sound box system and be provided with rubber blanket or sealing strip.
5. loudspeaker module tightness test system as claimed in claim 1, described audio analyzer comprises data processing unit, described data processing unit according to described loudspeaker module to be tested in the Sensitirity va1ue of preset frequency point or the sensitivity difference at different preset frequency point, by comparing to judge that whether the impermeability of described loudspeaker module to be tested qualified in the criterion of described preset frequency point or in the difference criterion of described different preset frequency point from normal sensibility.
6. loudspeaker module tightness test system as claimed in claim 1, wherein:
Described measuring amplifier is multiple, between the output terminal being separately positioned on described closed sound box system and the input end of described audio analyzer, carry out gain amplification for the Sensitirity va1ue exported the loudspeaker module multiple to be tested be sealed in described closed sound box system.
7. the loudspeaker module tightness test system according to any one of claim 1-6, wherein,
The span of the frequency of the sound field in described closed sound box system is 10Hz ~ 100Hz, and the span of sound pressure level is 100dBSPL ~ 140dBSPL.
8. use loudspeaker module tightness test system as claimed in claim 1 to carry out a method for loudspeaker module air tightness test, comprising:
Loudspeaker module to be tested is placed in described airtight sound field;
Obtain the Sensitirity va1ue of described loudspeaker module to be tested at preset frequency point;
Judge that whether the impermeability of described loudspeaker module to be tested is qualified according to normal sensibility in the criterion of described preset frequency point and the Sensitirity va1ue of described preset frequency point.
9. the method for loudspeaker module air tightness test as claimed in claim 8, wherein, the mode that described normal sensibility carries out air tightness test in the criterion of described preset frequency point by the loudspeaker module good to the impermeability of regulation number of samples obtains, and detailed process comprises:
Sampling loudspeaker module good for impermeability is placed in described airtight sound field;
Obtain the Sensitirity va1ue of each sampling loudspeaker module at described preset frequency point respectively;
The criterion of described normal sensibility at described preset frequency point is determined according to the described Sensitirity va1ue of all sampling loudspeaker modules.
10. the method for loudspeaker module air tightness test as claimed in claim 8, described method also comprises:
Obtain the Sensitirity va1ue of described loudspeaker module to be tested at another preset frequency point;
Calculate the sensitivity difference of described loudspeaker module to be tested between different preset frequency point;
Judge that whether the impermeability of described loudspeaker module to be tested is qualified according to normal sensibility in the difference criterion of described different preset frequency point and described sensitivity difference.
The method of 11. loudspeaker module air tightness tests as claimed in claim 10, wherein, the mode that described normal sensibility carries out air tightness test in the difference criterion of described different preset frequency point by the loudspeaker module good to the impermeability of regulation number of samples obtains, and detailed process comprises:
Sampling loudspeaker module good for impermeability is placed in described airtight sound field;
Obtain the Sensitirity va1ue of each sampling loudspeaker module at described different preset frequency point respectively;
Calculate the sensitivity difference of each sampling loudspeaker module at described different preset frequency point;
The difference criterion of described normal sensibility at described different preset frequency point is determined according to the described sensitivity difference of all sampling loudspeaker modules.
The method of 12. loudspeaker module air tightness tests according to any one of claim 8 ~ 11, wherein,
The span of the frequency of described airtight sound field is 10Hz ~ 100Hz, and the span of sound pressure level is 100dBSPL ~ 140dBSPL.
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| CN104898312A (en) * | 2015-06-25 | 2015-09-09 | 京东方科技集团股份有限公司 | Backlight source detecting device and detecting method |
| CN108683982B (en) * | 2018-05-21 | 2021-06-18 | 歌尔股份有限公司 | Sound box performance test method and system and sound box resonance test method |
| CN111901739B (en) * | 2020-09-30 | 2021-01-22 | 歌尔股份有限公司 | Sound production module, test method and electronic equipment |
| CN113655983B (en) * | 2021-07-27 | 2023-09-08 | 深圳市冠旭电子股份有限公司 | Audio playing method and device, audio playing equipment and readable storage medium |
| CN113923579B (en) * | 2021-11-17 | 2023-09-26 | 美特科技(苏州)有限公司 | Loudspeaker detection method and system |
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