CN103841505A - CCD acoustic resistance testing method and system of acoustic product - Google Patents
CCD acoustic resistance testing method and system of acoustic product Download PDFInfo
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- CN103841505A CN103841505A CN201410059780.7A CN201410059780A CN103841505A CN 103841505 A CN103841505 A CN 103841505A CN 201410059780 A CN201410059780 A CN 201410059780A CN 103841505 A CN103841505 A CN 103841505A
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Abstract
The invention provides a CCD acoustic resistance testing method and system of an acoustic product. The method comprises the steps that a collected image signal of a non-metallic blocking piece of the acoustic product is converted into a digital signal through a CCD system; the characteristics of the non-metallic blocking piece of the acoustic product are extracted according to the digital signal; the non-metallic blocking piece of the acoustic product is recognized according to the extracted characteristics, and then the light transmitting area of the non-metallic blocking piece of the acoustic product is determined according to a recognition result; acoustic resistance testing is performed on the acoustic product according to the determined light transmitting area. According to the CCD acoustic resistance testing method and system of the acoustic product, fully-automatic acoustic resistance testing of large-batch acoustic products can be achieved. Besides, the product cost can be lowered, and the acoustic resistance testing efficiency of the product can be improved.
Description
Technical field
The present invention relates to acoustic-electric technical field, more specifically, relate to a kind of CCD acoustic resistance method of testing and system of acoustic product.
Background technology
Sound is one of physical phenomenon of studying the earliest of the mankind, has benefited from just the research of the mankind to this physical phenomenon, and the acoustic products such as loud speaker, receiver can arise at the historic moment.In numerous acoustic products, the good and bad direct relation of tonequality the quality of product.
Take loud speaker as example, why people can hear the sound that loud speaker sends, and are because be provided with phonate hole in the position of its sound outgoing, and in order to reach good tonequality, all need to block piece be set in its phonate hole position.Block piece is generally nonmetallic network structure, and itself and speaker housings integrated injection molding form, and so just needs the acoustic resistance of product to test, to confirm whether product meets the requirements.
Existing acoustic resistance method of testing generally all adopts special acoustic resistance tester to test the acoustic resistance of product, in the time of product sounding, special acoustic resistance tester is by measuring sound wave when by nonmetal block piece, and the acoustic wave segment numerical value that nonmetal block piece stops determines whether product meets the requirements.
This kind of acoustic resistance method of testing be the inadaptable full examination that detects in enormous quantities not only, and test sealing and method of testing also comparatively loaded down with trivial details.What is more important, it can only quantize acoustic resistance value, cannot accurately test out accurate acoustic resistance value, also cannot identify the outward appearance of nonmetal block piece, when nonmetal block piece is in the situation that having impurity or occur breakage, distortion, adopt this kind of acoustic resistance method of testing obviously not reach the requirement of test.If reach the requirement of test, must arrange manually the outward appearance of nonmetal block piece to be identified, and the mode of manual work not only cannot avoid the situation of leakage to occur, testing efficiency is also extremely low, and this can increase the cost of product undoubtedly.
Summary of the invention
In view of the above problems, the object of this invention is to provide a kind of method and system of acoustic product, to realize full-automatic acoustic resistance test, reach the object that reduces product cost and improve product test efficiency.
According to an aspect of the present invention, provide a kind of CCD acoustic resistance method of testing of acoustic product, comprising:
Convert the picture signal of the nonmetal block piece of gathered acoustic product to digital signal by CCD system;
Extract the feature of the nonmetal block piece of acoustic product according to digital signal;
According to extracted feature, the nonmetal block piece of acoustic product is identified, then determined the glazed area of the nonmetal block piece of acoustic product according to recognition result;
According to glazed area, acoustic product is carried out to acoustic resistance test.
Wherein, gather the image of the nonmetal block piece of acoustic product by the optical lens in CCD system; Then, convert gathered image to picture signal by the image processing apparatus in CCD system or image processing software.
Wherein, picture signal being converted in the process of digital signal by CCD system, convert picture signal to digital signal according to the pixel distribution of gathered picture signal, brightness and colouring information.
Wherein, acoustic product being carried out in the process of acoustic resistance test according to glazed area, according to determined glazed area, acoustic product is carried out to stepping classification, the acoustic product of then stepping being sorted out carries out acoustic resistance test, obtains the acoustic product of stepping classification and the corresponding relation of acoustic resistance performance yield.
On the other hand, the present invention also provides a kind of CCD acoustic resistance test macro of acoustic product, comprising:
Digital signal converting unit, for converting the picture signal of the nonmetal block piece of gathered acoustic product to digital signal by CCD system;
Feature extraction unit, extracts the feature of the nonmetal block piece of acoustic product for the digital signal changed according to digital signal converting unit;
Glazed area determining unit, identifies the nonmetal block piece of acoustic product for the feature extracting according to feature extraction unit, then determines the glazed area of the nonmetal block piece of product according to recognition result;
Acoustic resistance test cell, for carrying out acoustic resistance test according to the determined glazed area of glazed area determining unit to acoustic product.
Utilize above-mentioned according to CCD acoustic resistance method of testing and the system of acoustic product of the present invention, gather the picture signal of the nonmetal block piece of product by optical lens, then convert picture signal to digital signal by CCD system, and weigh the trafficability characteristic of sound by the fretwork area that calculating is converted into the nonmetal block piece of image, thereby can realize the full-automatic acoustic resistance test of acoustic product in enormous quantities, and can reduce the cost of product and the acoustic resistance testing efficiency of raising product.
In order to realize above-mentioned and relevant object, one or more aspects of the present invention comprise below by the feature that describes in detail and particularly point out in the claims.Explanation below and accompanying drawing describe some illustrative aspects of the present invention in detail.But, the indication of these aspects be only some modes that can use in the variety of way 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 along with understanding more comprehensively 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 CCD acoustic resistance method of testing schematic flow sheet according to the acoustic product of the embodiment of the present invention;
Fig. 2 is according to the corresponding relation block diagram of the acoustic product of the embodiment of the present invention and acoustic resistance performance yield;
Fig. 3 is the CCD acoustic resistance test macro logical construction block diagram according to the acoustic product of the embodiment of the present invention.
In institute's drawings attached, identical label is indicated similar or corresponding feature or function.
Embodiment
Below with reference to accompanying drawing, specific embodiments of the invention are described in detail.
Detect examination for aforementioned existing acoustic resistance method of testing is inadaptable in enormous quantities complete, and test sealing and method of testing is loaded down with trivial details and the low problem of testing efficiency.The present invention is by adopting optical lens cheaply to gather the image of the nonmetal block piece of product, and by image processing apparatus, the image of collection is converted to picture signal, then convert picture signal to digital signal by CCD system, and the fretwork area that is converted into the nonmetal block piece of image by calculating carries out acoustic resistance test to product, thereby can realize the full-automatic acoustic resistance test of acoustic product in enormous quantities, and can reduce the cost of product and the testing efficiency of raising product.
It should be noted that CCD(Charger-coupled Device, charge coupled cell), also referred to as ccd image sensor, be a kind of semiconductor device that optical image can be converted into digital signal.CCD system, also referred to as Vision Builder for Automated Inspection, can replace human eye measure and judge with machine, and the present invention, just because of having adopted CCD system, can realize the acoustic resistance test of automation.
For the CCD acoustic resistance method of testing of acoustic product provided by the invention is described, Fig. 1 shows the CCD acoustic resistance method of testing flow process according to the acoustic product of the embodiment of the present invention.
As shown in Figure 1, the CCD acoustic resistance method of testing of acoustic product provided by the present invention comprises:
S110: convert the picture signal of the nonmetal block piece of gathered acoustic product to digital signal by CCD system.
Wherein, gather the image of the nonmetal block piece of acoustic product by the optical lens in CCD system, then convert gathered image to picture signal by the image processing apparatus in CCD system or image processing software.
It should be noted that, before the image of nonmetal block piece that gathers product, product need to be positioned on test platform, then mouse hit testing button detects product, after trace routine starts, optical lens just can carry out IMAQ to the product being placed on test platform.
Particularly, because optical lens is current very ripe visual identity camera lens, it can replace human eye product is measured and judged, the situation of missing test products therefore can avoid manual work time occurs, and can improve the efficiency of test and reduce the cost of product.
Utilize optical lens to gather the image of the nonmetal block piece of product, precision can reach 0.00875mm simultaneously, therefore can guarantee the precision of gathered image and guarantee the accurately effectively calculating of the glazed area of the nonmetal block piece to product.
S120: the feature that extracts the nonmetal block piece of acoustic product according to digital signal.
Particularly, because CCD system can be converted into digital signal by optical image.Therefore,, picture signal being converted in the process of digital signal by CCD system, convert picture signal to digital signal according to the pixel distribution of gathered picture signal, brightness and colouring information.
Wherein, according to digital signal, extract in the process of feature of the nonmetal block piece of acoustic product, the feature extracting comprises area, quantity, position and the length of the nonmetal block piece of acoustic product.Control the action of the equipment of test site according to the feature extracting, namely the nonmetal block piece of acoustic product is identified, see whether it meets default test request.
S130: according to extracted feature, the nonmetal block piece of acoustic product is identified, then determined the glazed area of the nonmetal block piece of acoustic product according to recognition result.
Before the nonmetal block piece of acoustic product is identified, should preset in advance the permissibility of test, comprise the abnormal diaphanous spot that test zone (i.e. default region) that tested product is placed and tested product allow.
Wherein, in the process of the nonmetal block piece of acoustic product being identified according to extracted feature, judge that the diaphanous spot of nonmetal block piece of acoustic product is whether in default region, in the time that diaphanous spot is in default region, by judging in predeterminable area or the edge at predeterminable area, whether the quantity of the abnormal diaphanous spot of the nonmetal block piece of acoustic product exceedes the quantity of default abnormal diaphanous spot, and the nonmetal block piece of acoustic product is identified.
Particularly, in the time that the diaphanous spot of nonmetal block piece of judging acoustic product is not in default region, be likely that tested product position or the angle of on test platform, placing are incorrect, do not meet the requirement of test.
When judging in predeterminable area or the edge at predeterminable area, the diaphanous spot of the nonmetal block piece of acoustic product has exceeded default abnormity point, the outward appearance defectiveness of tested acoustic product is described, open defect can affect the acoustic resistance test performance of acoustic product.
By the identification of the nonmetal block piece to acoustic product, can automatic decision go out the whether defectiveness of outward appearance whether acoustic product meets test request and acoustic product, thereby save manpower, improve the efficiency of acoustic resistance test.
S140: acoustic product is carried out to acoustic resistance test according to glazed area.
Wherein, acoustic product being carried out in the process of acoustic resistance test according to glazed area, according to determined glazed area, acoustic product is carried out to stepping classification, the acoustic product of then stepping being sorted out carries out acoustic resistance test, obtains the acoustic product of stepping classification and the corresponding relation of acoustic resistance performance yield.
Wherein, calculate the glazed area of the nonmetal block piece of acoustic product according to recognition result, can determine glazed area by result of calculation.Particularly, a collection of acoustic product is carried out respectively to the calculating of glazed area, then carry out stepping classification according to calculated glazed area, then carry out acoustic resistance test, thereby obtain the corresponding relation of this batch of acoustic product and acoustic resistance performance yield.Wherein, Fig. 2 shows according to the corresponding relation of the acoustic product of the embodiment of the present invention and acoustic resistance performance yield.Transverse axis shown in Fig. 2 represents the gear of the glazed area of this batch of acoustic product, and wherein glazed area is take the quantity of pixel as unit, and the longitudinal axis represents the acoustic resistance performance yield of corresponding gear.Can find out from the block diagram shown in Fig. 2, glazed area is in the time of 24～270,000 pixels, the acoustic resistance performance yield of acoustic product all can not reach 100%, only has glazed area in the time of 27～300,000 pixels, and the acoustic resistance performance yield of acoustic product can reach 100%.
Can find out according to the flow process shown in Fig. 1, the present invention can be in the situation that not adopting special acoustic resistance testing equipment, adopt optical frames cheaply to become just can complete the acoustic resistance test of acoustic product, and in test, the open defect of the nonmetal block piece to acoustic product is identified automatically.The full-automatic acoustic resistance test of acoustic product in enormous quantities can be realized by the present invention, and the cost of product and the acoustic resistance testing efficiency of raising product can be reduced.
Corresponding with said method, the present invention also provides a kind of CCD acoustic resistance test macro of acoustic product.Fig. 3 shows the CCD acoustic resistance test macro logical construction according to the acoustic product of the embodiment of the present invention.
As shown in Figure 3, the CCD acoustic resistance test macro 300 of acoustic product provided by the present invention comprises digital signal converting unit 310, feature extraction unit 320, glazed area determining unit 330 and acoustic resistance test cell 340.
Wherein, digital signal converting unit 310 is for converting the picture signal of the nonmetal block piece of gathered acoustic product to digital signal by CCD system.
Wherein, gather the image of the nonmetal block piece of acoustic product by the optical lens in CCD system, then convert gathered image to picture signal by the image processing apparatus in CCD system or image processing software.
Particularly, because optical lens is current very ripe visual identity camera lens, it can replace human eye acoustic product is measured and judged, the situation of missing test products therefore can avoid manual work time occurs, and can improve the efficiency of test and reduce the cost of product.
Utilize optical lens to gather the image of the nonmetal block piece of product, precision can reach 0.00875mm simultaneously, therefore can guarantee the precision of gathered image and guarantee the accurately effectively calculating of the glazed area of the nonmetal block piece to acoustic product.
Picture signal being converted in the process of digital signal by CCD system, convert picture signal to digital signal according to the pixel distribution of gathered picture signal, brightness and colouring information.
Wherein, feature extraction unit 320, according to digital signal, extracts in the process of feature of the nonmetal block piece of acoustic product, and the feature extracting comprises area, quantity, position and the length of the nonmetal block piece of acoustic product.Control the action of the equipment of test site according to the feature extracting, namely the nonmetal block piece of acoustic product is identified, see whether it meets default test request.
Glazed area determining unit 330 is identified the nonmetal block piece of product for the feature extracting according to feature extraction unit 320, then determines the glazed area of the nonmetal block piece of acoustic product according to recognition result.
Before the nonmetal block piece of acoustic product is identified, should preset in advance the permissibility of test, comprise the abnormal diaphanous spot that test zone (i.e. default region) that tested product is placed and tested product allow.
Wherein, in the process of the nonmetal block piece of acoustic product being identified in the feature extracting according to feature extraction unit 320, judge that the diaphanous spot of nonmetal block piece of acoustic product is whether in default region, in the time that diaphanous spot is in default region, by judging in predeterminable area or the edge at predeterminable area, whether the quantity of the abnormal diaphanous spot of the nonmetal block piece of acoustic product exceedes the quantity of default abnormal diaphanous spot, and the nonmetal block piece of acoustic product is identified.
Particularly, in the time that the diaphanous spot of nonmetal block piece of judging acoustic product is not in default region, be likely that tested product position or the angle of on test platform, placing are incorrect, do not meet the requirement of test.
When judging in predeterminable area or the edge at predeterminable area, the diaphanous spot of the nonmetal block piece of acoustic product has exceeded default abnormity point, the outward appearance defectiveness of tested acoustic product is described, open defect can affect the acoustic resistance test performance of product.
By the identification of the nonmetal block piece to acoustic product, can automatic decision go out the whether defectiveness of outward appearance whether product meets test request and product, thereby save manpower, improve the efficiency of test.
Acoustic resistance test cell 340 is for carrying out acoustic resistance test according to the determined glazed area of glazed area determining unit 330 to product.
Wherein, acoustic resistance test cell 340 is carrying out product in the process of acoustic resistance test according to determined glazed area, according to determined glazed area, acoustic product is carried out to stepping classification, then the acoustic product of stepping being sorted out carries out acoustic resistance test, obtains the acoustic product of stepping classification and the corresponding relation of acoustic resistance performance yield.
Can find out by above-mentioned, the CCD acoustic resistance method of testing of acoustic product provided by the present invention and system can realize the full-automatic acoustic resistance test of acoustic product in enormous quantities, and can reduce the cost of product and the acoustic resistance testing efficiency of raising product.
In the mode of example, CCD acoustic resistance method of testing and the system according to acoustic product of the present invention described above with reference to accompanying drawing.But, it will be appreciated by those skilled in the art that CCD acoustic resistance method of testing and the system of the acoustic product proposing for the invention described above, can also on the basis that does not depart from content of the present invention, make various improvement.Therefore, protection scope of the present invention should be determined by the content of appending claims.
Claims (9)
1. a CCD acoustic resistance method of testing for acoustic product, comprising:
Convert the picture signal of the nonmetal block piece of gathered acoustic product to digital signal by CCD system;
Extract the feature of the nonmetal block piece of described acoustic product according to described digital signal;
According to extracted feature, the nonmetal block piece of described acoustic product is identified, then determined the glazed area of the nonmetal block piece of described acoustic product according to recognition result;
According to described glazed area, described acoustic product is carried out to acoustic resistance test.
2. the CCD acoustic resistance method of testing of acoustic product as claimed in claim 1, wherein,
Gather the image of the nonmetal block piece of described acoustic product by the optical lens in described CCD system; Then,
Convert gathered image to picture signal by the image processing apparatus in described CCD system or image processing software.
3. the CCD acoustic resistance method of testing of acoustic product as claimed in claim 1, wherein, picture signal being converted to by CCD system in the process of digital signal,
Convert described picture signal to digital signal according to the pixel distribution of gathered picture signal, brightness and colouring information.
4. the CCD acoustic resistance method of testing of acoustic product as claimed in claim 1, wherein, according to described digital signal, extracts in the process of feature of the nonmetal block piece of described acoustic product,
The feature extracting comprises area, quantity, position and the length of the nonmetal block piece of described acoustic product.
5. the CCD acoustic resistance method of testing of acoustic product as claimed in claim 1, wherein, in the process of the nonmetal block piece of described acoustic product being identified according to extracted feature,
Judge that the diaphanous spot of nonmetal block piece of described acoustic product is whether in default region, in the time that described diaphanous spot is in default region, by judging in predeterminable area or the edge at predeterminable area, whether the quantity of the abnormal diaphanous spot of the nonmetal block piece of described acoustic product exceedes the quantity of default abnormal diaphanous spot, and the nonmetal block piece of described acoustic product is identified.
6. CCD acoustic resistance method of testing as claimed in claim 1, wherein, described acoustic product being carried out according to described glazed area in the process of acoustic resistance test,
According to determined glazed area, described acoustic product is carried out to stepping classification, the acoustic product of then stepping being sorted out carries out acoustic resistance test, obtains the acoustic product of stepping classification and the corresponding relation of acoustic resistance performance yield.
7. a CCD acoustic resistance test macro for acoustic product, comprising:
Digital signal converting unit, for converting the picture signal of the nonmetal block piece of gathered acoustic product to digital signal by CCD system;
Feature extraction unit, extracts the feature of the nonmetal block piece of described acoustic product for the digital signal of changing according to described digital signal converting unit;
Glazed area determining unit, identifies the nonmetal block piece of described acoustic product for the feature extracting according to described feature extraction unit, then determines the glazed area of the nonmetal block piece of described acoustic product according to recognition result;
Acoustic resistance test cell, for carrying out acoustic resistance test according to the determined glazed area of glazed area determining unit to described acoustic product.
8. the CCD acoustic resistance test macro of acoustic product as claimed in claim 7, wherein, described feature extraction unit in the process of feature of nonmetal block piece that extracts described acoustic product,
The feature extracting comprises area, quantity, position and the length of the nonmetal block piece of described acoustic product.
9. the CCD acoustic resistance test macro of acoustic product as claimed in claim 7, wherein, described acoustic resistance test cell is carrying out described acoustic product according to glazed area in the process of acoustic resistance test,
According to determined glazed area, described acoustic product is carried out to stepping classification, the acoustic product of then stepping being sorted out carries out acoustic resistance test, obtains the acoustic product of stepping classification and the corresponding relation of acoustic resistance performance yield.
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