CN202035041U - Voice frequency test system of mobile communication terminal - Google Patents
Voice frequency test system of mobile communication terminal Download PDFInfo
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- CN202035041U CN202035041U CN2011201551198U CN201120155119U CN202035041U CN 202035041 U CN202035041 U CN 202035041U CN 2011201551198 U CN2011201551198 U CN 2011201551198U CN 201120155119 U CN201120155119 U CN 201120155119U CN 202035041 U CN202035041 U CN 202035041U
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Abstract
The utility model discloses a voice frequency test system of mobile communication terminal, which realizes voice frequency test based on an up access model and a down access model which are provided by the mobile communication terminal and an earphone port. When the voice frequency test system conducts a voice frequency test process of an up access, and test feedback signals are processed by the mobile communication terminal and formed, transmitted to a signal processing device through a tip contact and a middle ring first contact in the earphone port. In a voice frequency test process of a down access, test signals generated by the signal processing unit directly enters the mobile communication terminal through a middle ring second contact in the earphone port, and does not require other devices to realize signal transmission, thereby reducing system cost. Further modulation and demodulation of signals are avoided in the signal transmission process, thereby effectively shortening test time under the condition that other signal processing processes are unchanged.
Description
Technical field
The utility model belongs to acoustic technique and communication technical field, relates in particular to a kind of audio test system of mobile communication terminal.
Background technology
The voice call effect is one of important indicator of weighing mobile communication terminal quality quality, therefore to the test of mobile communication terminal audio frequency with detect the attention that more and more is subjected to manufacturer and user.
In the large-scale production manufacture process of mobile communication terminal, the factor that influences the mobile communication terminal audio-frequency function is a lot.Except the design of voicefrequency circuit, audio cavity structure and the software aspect of development, also adopt a lot of crucial audio frequency components and parts in process of production in enormous quantities, as microphone, receiver, loud speaker, audio frequency power amplifier etc., the performance parameter of these components and parts has discrete type inevitably, and the audio performance of mobile communication terminal is affected greatly equally.At the difference of audio performance, need when producing, mobile communication terminal carry out the audio performance test to it.
Equipment manufacturers mostly carry out audio-frequency test by artificial method.Be set to the mode of circuit pattern by mobile communication terminal, manually the Mike in the mobile communication terminal located sounding,, judge whether the audio performance of mobile communication terminal is qualified by the tonequality situation of hearing at the receiver place.This mode, testing staff's subjective factor is very big to the influence of test result, is difficult to form objective standard; The detection efficiency of manual type is lower simultaneously, can't adapt to requirement of mass production.
At present, the audio testing method that a kind of mobile communication equipment also occurred, between tested mobile communication terminal and audio-frequency test analyzer, the radio communication base station simulator is set, the radio communication base station simulator can be set up conversation, the talking state under the simulates real real environment with tested mobile communication terminal.At up direction, audio analyzer is sent to mobile communication terminal with simulated audio signal, the Mike of mobile communication terminal receives this signal, and be modulated to high frequency and pass to the radio communication base station simulator, after the radio communication base station simulator receives this signal, demodulation also is reduced into analog signal, is back to audio analyzer, and audio analyzer is analyzed the uplink audio performance of mobile communication terminal according to the signal that returns.At down direction, audio analyzer is sent to the radio communication base station simulator with simulated audio signal, this radio communication base station simulator receives this signal, and it is modulated to high frequency passes to mobile communication terminal, after terminal receives this signal, demodulation also is reduced into analog signal, is back to audio analyzer, and audio analyzer is analyzed the downlink audio performance of mobile communication terminal according to the signal that returns.
In above-mentioned audio testing method, depend on the radio communication base station simulator and set up the virtual communication process, based on the loop of rf the audio frequency of mobile communication terminal is tested.Because the price of radio communication base station simulator is higher, the cost that causes mobile communication terminal is carried out audio-frequency test is very high, and no matter the uplink audio performance is still tested the downlink audio performance, all to carry out the modulation and demodulation of signal, prolonged the testing time.
The utility model content
In view of this, the purpose of this utility model is to provide a kind of audio test system of mobile communication terminal, can effectively reduce the cost of test, and shortens the testing time.
For achieving the above object, the utility model provides following technical scheme:
A kind of audio test system of mobile communication terminal, described mobile communication terminal has communication interface and earphone interface, and described audio test system comprises artitificial ear, artificial mouth, signal processing apparatus, main control unit and electric supply installation;
Described signal processing apparatus is connected with tip contact, middle ring 1 contact and middle ring 2 contacts in described artitificial ear, artificial mouth and the described earphone interface respectively, can send test massage to described artificial mouth, middle ring 2 contacts, and from described artitificial ear, tip contact and ring 1 contact acceptance test feedback signal;
Described main control unit is connected with communication interface with described signal processing apparatus respectively, can control described mobile communication terminal by the communication interface that is attached thereto and enter uplink pattern and downlink pattern, and determine to send loudness rating and receive loudness rating according to the test feedback signal in the signal processing apparatus that is attached thereto;
Described electric supply installation is connected with described artitificial ear, artificial mouth, signal processing apparatus and main control unit respectively.
This shows, the beneficial effects of the utility model are: the audio test system of the disclosed mobile communication terminal of the utility model, the uplink pattern and the downlink pattern that have based on mobile communication terminal itself, and earphone interface is realized audio-frequency test, in uplink audio-frequency test process, handle the test feedback signal that the back forms through mobile communication terminal, directly transfer to signal processing apparatus by tip contact in the earphone interface and middle ring 1 contact, in downlink audio-frequency test process, the test signal that signal processing apparatus generates directly enters mobile communication terminal by middle ring 2 contacts in the earphone interface, need not to realize the signal transmission, reduced system cost by means of other equipment; And above-mentioned signals transmission avoided carrying out the modulation and demodulation of signal, under the constant situation of other signal processings, effectively shortened the testing time.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below is embodiment more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the structural representation of the audio test system of the disclosed a kind of mobile communication terminal of the utility model;
Fig. 2 is the structural representation of the audio test system of the disclosed another kind of mobile communication terminal of the utility model;
Fig. 3 is the disclosed a kind of front view of testing shielded box of the utility model;
Fig. 4 is the end view of test shielded box shown in Figure 3;
Fig. 5 is the vertical view of test shielded box shown in Figure 3.
Embodiment
Most at present mobile communication terminals (as mobile phone or PDA) are provided with earphone interface and communication interface.
Earphone interface comprises tip contact, middle ring 1 contact, middle ring 2 contacts, terminal contacts and socket ring set.Wherein, tip contact and middle ring 1 contact are used to export the audio signal of electrical signal form, and tip contact is connected with the receiver L channel, and middle ring 1 contact is connected with the receiver R channel; Middle ring 2 contacts are used to receive the audio signal of electrical signal form, are connected with transmitter; Terminal contacts is connected with signal circuit, promptly meets GND; When socket collar is electric conducting material, be connected, promptly meet GND with signal circuit.
Can be set to uplink pattern and downlink pattern by mobile communication terminal by communication interface.In the downlink pattern, the processor in the mobile communication terminal can drive loud speaker or transmitter sends voice messaging.
For the purpose, technical scheme and the advantage that make the utility model embodiment clearer, below in conjunction with the accompanying drawing among the utility model embodiment, technical scheme among the utility model embodiment is clearly and completely described, obviously, described embodiment is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making the every other embodiment that is obtained under the creative work prerequisite, all belong to the scope of the utility model protection.
The utility model discloses a kind of audio test system of mobile communication terminal, compare, can effectively reduce the cost of test, and shorten the testing time with existing test macro.
Referring to Fig. 1, Fig. 1 is the structural representation of the audio test system of the disclosed a kind of mobile communication terminal of the utility model.Comprise: artitificial ear 1, artificial mouth 2, signal processing apparatus 3, main control unit 4 and electric supply installation 5.
Wherein, signal processing apparatus 3 is connected with tip contact, middle ring 1 contact and middle ring 2 contacts in the earphone interface 6 of artitificial ear 1, artificial mouth 2 and tested mobile communication terminal respectively.Signal processing apparatus 3 can generate test signal, and this test signal is sent to artificial mouth 2, middle ring 2 contacts.Synchronous signal processing unit 3 can also from artitificial ear 1, tip contact and ring 1 contact acceptance test feedback signal, and the test feedback signal that receives handled, the test feedback signal after will handling afterwards transfers to main control unit 4.
In the specific implementation process, the structure of signal processing apparatus 3 can be as shown in Figure 2.Comprise: signal generating module 31, pre-amplifying module 32, signal acquisition module 33 and analog-to-digital conversion module 34.
Wherein, signal generating module 31 is connected with pre-amplifying module 31 with main control unit 4 respectively, can generate test signal under the control of main control unit 4, and test signal is sent to the pre-amplifying module 32 that is attached thereto.In force, the test signal of signal generating module 31 generations is the composite signal that comprises 14 Frequency points.14 Frequency points distribute between 200Hz～4000Hz, are respectively: 200Hz, 250Hz, 315Hz, 400Hz, 500Hz, 630Hz, 800Hz, 1000Hz, 1250Hz, 1600Hz, 2000Hz, 2500Hz, 3150Hz and 4000Hz.
Analog-to-digital conversion module 34 is connected with main control unit 4 with signal acquisition module 33 respectively, and the test feedback signal of electrical signal form in the signal acquisition module 33 is carried out analog-to-digital conversion, and the test feedback signal with digital signal form transfers to main control unit 4 afterwards.
In the process that the audio performance of mobile communication terminal is tested, at first by communication interface 7 sending controling instructions of main control unit 4 to tested mobile communication terminal, control tested mobile communication terminal and enter uplink pattern or downlink pattern, in the downlink pattern, main control unit 4 also can be set to loud speaker sounding or transmitter sounding by tested mobile communication terminal.
In uplink audio-frequency test process, signal generating module 31 generates test signal, is sent to artificial mouth 2 after 32 pairs of test signals of pre-amplifying module are amplified; Artificial mouth 2 is converted to voice signal with the test signal that receives; The microphone of mobile communication terminal is gathered voice signal, after handling through the processor in the mobile communication terminal, from the tip contact of earphone interface 6 and ring 1 contact output test feedback signal; Data acquisition module 33 from the tip contact of earphone interface 6 and ring 1 contact obtain the test feedback signal; 34 pairs of tests of analog-to-digital conversion module feedback signal is carried out analog-to-digital conversion; Main control unit 4 obtains the test feedback signal after the analog-to-digital conversion, determines to send loudness rating according to the test feedback signal after the analog-to-digital conversion.
Determine the acoustic pressure Pm of artificial mouth 2; Determine the acoustic pressure Vj of each Frequency point in the test feedback signal; Determine to send sensitivity/frequecy characteristic Smj according to formula S mj=20lg (Vj/Pm) dB; Afterwards according to formula
Determine the SLR that sends loudness rating, wherein, Ws is a weight coefficient, the numerical value (seeing Table 1) that different frequency is corresponding different, and m is a slope coefficient, gets 0.175.
In downlink audio-frequency test process, signal generating module 31 generates test signal, is sent to middle ring 2 contacts of earphone interface 6 after 32 pairs of test signals of pre-amplifying module are amplified; After the processor of mobile communication terminal is handled test signal, drive the sounding parts and send voice signal; Artitificial ear 1 is gathered voice signal, and generates the test feedback signal; Data acquisition module 33 obtains the test feedback signal from artitificial ear 1; 34 pairs of tests of analog-to-digital conversion module feedback signal is carried out analog-to-digital conversion; Main control unit 4 obtains the test feedback signal after the analog-to-digital conversion, determines to receive loudness rating according to the test feedback signal after the analog-to-digital conversion.
After the processor of mobile communication terminal was handled test signal, when the driving loud speaker sent voice signal, the reception loudness rating that final main control unit 4 is determined according to the test feedback signals was hands-free loudness rating.
After the processor of mobile communication terminal was handled test signal, when the driving transmitter sent voice signal, the reception loudness rating that final main control unit 4 is determined according to the test feedback signals was the transmitter loudness rating.
Determine vibration open circuit level Ej; Determine the acoustic pressure Pe of each Frequency point in the test feedback signal; Determine receiving sensitivity/frequency characteristic Sje according to formula S je=20lg (Pe/0.5Ej) dB; Sound when phone is listened in the design of considering people's ear is revealed, and Sje is revised, and concrete deducts Le to Sje, and Le has different values (seeing Table 1) at different frequencies; Afterwards according to formula
Determine to receive loudness rating, wherein, Wr is a weight coefficient, the numerical value (seeing Table 1) that different frequency is corresponding different, and m is a slope coefficient, gets 0.175.
Table 1
When the processor of mobile communication terminal drove the loud speaker sounding, definite reception loudness rating was hands-free loudness rating, and when the processor of mobile communication terminal drove the transmitter sounding, definite reception loudness rating was the transmitter loudness rating.
The audio test system of the disclosed mobile communication terminal of the utility model, uplink pattern that has based on mobile communication terminal itself and downlink pattern and earphone interface are realized audio-frequency test.In uplink audio-frequency test process, handle the test feedback signal that the back forms through mobile communication terminal, directly transfer to signal processing apparatus by tip contact in the earphone interface and middle ring 1 contact, in downlink audio-frequency test process, the test signal that signal processing apparatus generates directly enters mobile communication terminal by middle ring 2 contacts in the earphone interface, need not to realize the signal transmission, reduced system cost by means of other equipment; And above-mentioned signals transmission avoided carrying out the modulation and demodulation of signal, under the constant situation of other signal processings, effectively shortened the testing time.
In the enforcement, mobile communication terminal is being carried out in the audio-frequency test process, artificial mouth 2 and artitificial ear 1 can be arranged in the test shielded box, tested mobile communication terminal is positioned on the anchor clamps of testing in the shielded box, by anchor clamps tested mobile communication terminal is gripped, the clamp that these anchor clamps comprise base plate and are arranged at the base plate both sides is placed on tested mobile communication terminal on the base plate, and the clamp by both sides grips tested mobile communication terminal afterwards.The test shielded box can provide an insulation environment for audio-frequency test, avoids other signals of telecommunication that test is impacted.
Preferably, at the inner surface of testing shielded box acoustical cotton is set, acoustical cotton can be isolated by sound to external world, for audio-frequency test provides quiet environment, avoids the extraneous sound that test is impacted.
When mobile communication terminal is carried out audio-frequency test, tested mobile communication terminal is placed on the base plate of anchor clamps, the position of regulating two clamps grips tested mobile communication terminal, alignment jig is to test position afterwards, cable is inserted earphone interface and communication interface, set up earphone interface and signal processing apparatus be connected and communication interface and main control unit between be connected, start test process afterwards.After test is finished, the cable in earphone interface and the communication interface is taken out, alignment jig takes out mobile communication terminal afterwards to initial position from anchor clamps.
In order to realize the automation to the mobile communication terminal audio-frequency test, the utility model discloses a kind of test shielded box, and its structure is referring to Fig. 3, Fig. 4 and Fig. 5.Fig. 3 is the disclosed a kind of front view of testing shielded box of the utility model, and Fig. 4 is the end view of test shielded box shown in Figure 3, and Fig. 5 is the vertical view of test shielded box shown in Figure 3.
In this test shielded box 8, be provided with artitificial ear 1, artificial mouth 2 and anchor clamps adjusting device (not indicating among the figure).This anchor clamps adjusting device can be used for the locus of alignment jig 9, comprising: platform 101, turnover cylinder 102 and guide rail 103.Wherein, platform 101 is used to place anchor clamps 9, is provided with the groove (not shown) in its bottom; Guide rail 103 be arranged at the test shielded box 8 the bottom, can with described groove fit; Turnover cylinder 102 is connected with platform 101, can drive platform 101 and move along guide rail 103.
Preferably, test component (not indicating among the figure) is set further in this test shielded box 8, this test component comprises: test action cylinder 201, the earphone contact pin (not shown) and the contact pin (not shown) of communicating by letter.Wherein, test action cylinder 201 is arranged on the described platform 101; The earphone contact pin is connected with the piston rod of described test action cylinder 201, and an end of earphone contact pin can insert in the earphone interface of tested mobile communication terminal, and the other end is connected with described signal processing apparatus by the cable (not shown); The communication contact pin is connected with the piston rod of described test action cylinder 201, and an end of communication contact pin can insert in the communication interface of described tested mobile communication terminal, and the other end is connected with described main control unit by the cable (not shown).
Preferably, left side clamping loosening cylinder 301 and right the clamping further are set in this test shielded box loosen cylinder 302, a left side clamps loosens cylinder 301 and right the clamping loosened on the clamp 91 that cylinder 302 acts on anchor clamps 9 respectively, and the described clamp 91 of may command clamps or loosens the tested mobile communication terminal that is positioned on the described base plate (indicating among the figure).
Before mobile communication terminal is tested, anchor clamps are positioned at initial position, a left side clamps the piston rod that loosens cylinder 301 and right side clamping loosening cylinder 302 and is in the state of stretching out, piston rod acts on two clamps 91 of anchor clamps 9, make two clamps 91 be in relaxation state, tested mobile communication terminal is positioned on the base plate of anchor clamps 9 by the tester; Main control unit 4 clamping mode cylinder 301 and right clamping the left loosens cylinder 302 and transmits control signal, left clamping mode cylinder 301 and rightly clamp the piston rod withdrawal of loosening cylinder 302, and two clamps 91 clamp tested mobile communication terminals; Main control unit 4 transmits control signal to turnover cylinder 102, and turnover cylinder 102 drives platform 101 and moves to test position along guide rail 103; Main control unit 4 transmits control signal to test action cylinder 201, and the piston rod of test action cylinder 201 stretches out, and the earphone contact pin inserts the earphone interface of tested mobile communication terminal, and the communication contact pin inserts the communication interface of tested mobile communication terminal; Begin mobile communication terminal is carried out audio-frequency test.
Behind the audio-frequency test of finishing mobile communication terminal, main control unit 4 transmits control signal to test action cylinder 201, the piston rod withdrawal of test action cylinder 201, the earphone contact pin is extracted from the earphone interface of tested mobile communication terminal, and the communication contact pin is extracted from the communication interface of tested mobile communication terminal; Main control unit 4 transmits control signal to turnover cylinder 102, and turnover cylinder 102 drives platform 101 and moves to initial position along guide rail 103; Main control unit 4 clamps left and loosens cylinder 301 and right the clamping loosened cylinder 302 and transmitted control signal, a left side clamps the piston rod that loosens cylinder 301 and right side clamping loosening cylinder 302 and stretches out, two clamps 91 loosen tested mobile communication terminal, by the tester tested mobile communication terminal are taken out.
Each embodiment adopts the mode of going forward one by one to describe in this specification, and what each embodiment stressed all is and the difference of other embodiment that identical similar part is mutually referring to getting final product between each embodiment.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the utility model.Multiple modification to these embodiment will be conspicuous concerning those skilled in the art, and defined herein General Principle can realize under the situation that does not break away from spirit or scope of the present utility model in other embodiments.Therefore, the utility model will can not be restricted to these embodiment shown in this article, but will meet and principle disclosed herein and features of novelty the wideest corresponding to scope.
Claims (7)
1. the audio test system of a mobile communication terminal, described mobile communication terminal has communication interface and earphone interface, it is characterized in that, and described audio test system comprises artitificial ear, artificial mouth, signal processing apparatus, main control unit and electric supply installation;
Described signal processing apparatus is connected with tip contact, middle ring 1 contact and middle ring 2 contacts in described artitificial ear, artificial mouth and the described earphone interface respectively, can send test massage to described artificial mouth, middle ring 2 contacts, and from described artitificial ear, tip contact and ring 1 contact acceptance test feedback signal;
Described main control unit is connected with communication interface with described signal processing apparatus respectively, can control described mobile communication terminal by the communication interface that is attached thereto and enter uplink pattern and downlink pattern, and determine to send loudness rating and receive loudness rating according to the test feedback signal in the signal processing apparatus that is attached thereto;
Described electric supply installation is connected with described artitificial ear, artificial mouth, signal processing apparatus and main control unit respectively.
2. audio test system according to claim 1 is characterized in that, described signal processing apparatus comprises: signal generating module, pre-amplifying module, signal acquisition module and analog-to-digital conversion module;
Described signal generating module is connected with pre-amplifying module with described main control unit respectively, can generate test signal under the control of main control unit, and described test signal is sent to the pre-amplifying module that is attached thereto;
Described pre-amplifying module also is connected with middle ring 2 contacts with described artificial mouth, can be to the test signal after artificial mouth that is attached thereto and the transmission amplification of middle ring 2 contacts;
Described signal acquisition module is connected with described artitificial ear, tip contact and middle ring 1 contact respectively, can receive the test feedback signal at the artitificial ear, tip contact and the place, middle ring 1 contact that are attached thereto;
Described analog-to-digital conversion module is connected with main control unit with described signal acquisition module respectively, described test feedback signal can be converted to digital signal and transfer to described main control unit.
3. audio test system according to claim 1 is characterized in that, described artificial mouth and artitificial ear are arranged in the test shielded box, in the described test shielded box anchor clamps are set also, and described anchor clamps comprise: base plate; But be arranged at the clamp of the tested mobile communication terminal of described base plate both sides clamping.
4. audio test system according to claim 3 is characterized in that the inner surface of described test shielded box is provided with acoustical cotton.
5. according to claim 3 or 4 described audio test systems, it is characterized in that, also be provided with the anchor clamps adjusting device of the locus that is used to regulate described anchor clamps in the described test shielded box, described anchor clamps adjusting device comprises: be used to place described anchor clamps, the bottom is provided with reeded platform; The turnover cylinder that is connected with described platform; Be arranged at described test shielded box bottom, with the guide rail of described groove fit.
6. audio test system according to claim 5 is characterized in that, in the described test shielded box test component is set also, and described test component comprises: be arranged at the test action cylinder on the described platform; Be connected, can insert the earphone contact pin of the earphone interface of described tested mobile communication terminal with the piston rod of described test action cylinder, the other end of described earphone contact pin is connected with described signal processing apparatus by cable; Be connected, can insert the communication contact pin of the communication interface of described tested mobile communication terminal with the piston rod of described test action cylinder, the other end of described communication contact pin is connected with described main control unit by cable.
7. according to claim 5 or 6 described audio test systems, it is characterized in that, a left side also is set in the described test shielded box clamps and to loosen cylinder and right the clamping loosened cylinder, the described clamp of may command clamps or loosens the tested mobile communication terminal that is positioned on the described base plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201551198U CN202035041U (en) | 2011-05-16 | 2011-05-16 | Voice frequency test system of mobile communication terminal |
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| CN2011201551198U CN202035041U (en) | 2011-05-16 | 2011-05-16 | Voice frequency test system of mobile communication terminal |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102185949A (en) * | 2011-05-16 | 2011-09-14 | 杭州厚德通信技术有限公司 | Audio testing system and method for mobile communication terminal |
| CN104154948A (en) * | 2013-05-14 | 2014-11-19 | 重庆盟讯电子科技有限公司 | Automatic test system for communication product |
| CN109788422A (en) * | 2019-01-18 | 2019-05-21 | 博罗县全成电子有限公司 | A kind of test program and system of hi-fidelity audio equipment |
| CN111836180A (en) * | 2019-04-23 | 2020-10-27 | Oppo（重庆）智能科技有限公司 | Electronic equipment earphone function test system and test method |
-
2011
- 2011-05-16 CN CN2011201551198U patent/CN202035041U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102185949A (en) * | 2011-05-16 | 2011-09-14 | 杭州厚德通信技术有限公司 | Audio testing system and method for mobile communication terminal |
| CN104154948A (en) * | 2013-05-14 | 2014-11-19 | 重庆盟讯电子科技有限公司 | Automatic test system for communication product |
| CN109788422A (en) * | 2019-01-18 | 2019-05-21 | 博罗县全成电子有限公司 | A kind of test program and system of hi-fidelity audio equipment |
| CN111836180A (en) * | 2019-04-23 | 2020-10-27 | Oppo（重庆）智能科技有限公司 | Electronic equipment earphone function test system and test method |
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Granted publication date: 20111109 Termination date: 20160516 |