TWI651004B - Microphone testing equipment and method thereof - Google Patents

Abstract

A microphone testing device for testing a microphone module to be assembled includes a test box, a cylinder and a main control module. The test box has a body, a bottom plate, a first cover plate and a second cover plate. The cylinder has a cylindrical upper acoustic cavity, a cylindrical lower acoustic cavity, and a spacer between the upper acoustic cavity and the lower acoustic cavity. The bottom of the isolation plate is formed with an opening, the lower sound chamber is provided with a speaker, the speaker faces the upper acoustic cavity through the opening, the bottom plate is used for closing the lower acoustic cavity, the first cover is used for closing the upper acoustic cavity, and the first cover forms at least one sound. hole. The main control module has a one-button test button exposed on the second cover, and when performing a one-button test, the speaker sends a test signal to form a test sound source in the upper sound cavity for receiving by the assembled microphone module.

Description

Microphone testing device and method thereof

The invention relates to a testing device and a method thereof, in particular to a microphone testing device and a method thereof.

As electronic products have higher and higher performance requirements for microphone modules, the testing requirements for the assembled microphone modules are also increasing.

At present, the test of the microphone module to be assembled on the production line is tested by placing the microphone module to be assembled in the test speaker to avoid interference from external sounds, but the existing test speaker is square and tested for testing. Accuracy, a large piece of sound-absorbing cotton is placed on the wall of the square cavity to prevent the sound from being reflected irregularly. However, laying a large piece of sound-absorbing cotton will greatly increase the cost, and if the sound absorption is not complete, it will cause the sound to pass through the sound-absorbing cotton and reflect it back, which will affect the accuracy of the test.

In view of this, the present inventors have been engaged in the development and design of related products for many years, and have been able to improve the above-mentioned defects. With great interest in research and cooperation with the use of academics, the present invention finally proposes a present invention which is reasonable in design and effective in improving the above-mentioned defects.

The main object of the present invention is to provide a microphone testing apparatus and method to solve the above problems.

An embodiment of the present invention provides a microphone testing device for testing a microphone module to be assembled. The microphone testing device includes: a test box body having an ontology, a first accommodating space and a second accommodating space formed on the inside of the body, a bottom plate at the bottom of the body, a first cover plate and a second cover plate at the top of the body; And disposed in the first accommodating space, the cylinder has a cylindrical upper acoustic cavity formed on the upper half of the cylinder, a cylindrical lower acoustic cavity formed in the lower half of the cylinder, and formed thereon a partition plate between the sound chamber and the lower sound chamber, wherein the partition plate is formed with an opening at a central position thereof, the lower sound chamber is provided with a speaker, and the speaker faces the upper sound chamber through the opening, the bottom plate is used for closing the lower sound chamber, The first cover plate is configured to close the upper acoustic cavity, and the first cover plate forms at least one sound hole; and a main control module is disposed in the second accommodating space, and the main control module and the speaker are electrically a connection, and the main control module has a key test button exposed on the second cover, the one-key test button can be pressed to perform a one-key test, so that the speaker sends a test signal to the upper sound chamber Forming a test sound source for the microphone module to be assembled .

The present invention provides a microphone testing method, including the steps of: providing a microphone testing device; providing a standard microphone module; using the standard microphone module to correct a test signal of the microphone testing device; and providing a microphone module to be assembled Testing the microphone module to be assembled with the corrected test signal, so that the microphone module to be assembled generates a response signal according to the corrected test signal; and analyzing the sound of the microphone module to be assembled according to the response signal As a result, it is determined whether the microphone module to be assembled is qualified.

The microphone testing device and the method thereof provided by the invention can divide the cylinder into two separate upper and lower acoustic chambers by the first cover plate, the separating plate and the bottom plate, and respectively, because the upper sound chamber and the lower sound chamber respectively Cylindrical, and the speaker is placed at the center position, so that the sound is reflected from the wall surface of the sound chamber to the center, so that when the speaker emits a test signal, a low-frequency stable sound field can be formed in the closed lower sound chamber. A test sound source that forms a uniform reflection in the upper acoustic cavity is received by the microphone module to be assembled, so there is no need to additionally lay a large sound-absorbing cotton on the wall of the sound cavity to prevent the sound from being random. In addition to the phenomenon of ground reflection, in addition to cost savings, it can avoid the sound reflection of incomplete sound absorption and affect the accuracy of the test. Furthermore, since the main control module has a one-button test key, all tests can be completed with only one press, and the test convenience can be increased without the need to configure professional testers for operation and maintenance.

1‧‧‧Test box

11‧‧‧Ontology

12‧‧‧First accommodation space

13‧‧‧Second accommodation space

14‧‧‧floor

15‧‧‧First cover

151‧‧‧ sound hole

152‧‧‧ fixed plate

1521‧‧‧through hole

1522‧‧‧ accommodating slots

153‧‧ ‧ press cover

1531‧‧‧ soundproof cotton

16‧‧‧second cover

2‧‧‧Cylinder

21‧‧‧Upper voice

22‧‧‧ below the sound chamber

221‧‧‧Speaker

23‧‧‧Isolation board

231‧‧‧ openings

3‧‧‧Master Module

31‧‧‧First board

311‧‧‧Microprocessing unit

312‧‧‧Signal generating unit

313‧‧‧Power amplification unit

314‧‧‧Variable resistor

315‧‧‧Power interface

316‧‧‧Source interface

317‧‧‧ Signal Interface

32‧‧‧Second circuit board

321‧‧‧One button test button

322‧‧‧Instruction unit

323‧‧‧Adapter plate

4‧‧‧Test host

M‧‧‧Microphone module to be assembled

S103~S113‧‧‧Steps

1 is a perspective view of a microphone testing device of the present invention.

2 is a partial exploded perspective view (1) of the microphone testing device of the present invention.

3 is a partial exploded perspective view of the microphone testing device of the present invention (2).

Figure 4 is a cross-sectional view taken along line IV-IV of Figure 1.

FIG. 5 is a partial schematic view of a microphone testing device of the present invention.

Figure 6 is a diagram showing the state of use of the microphone test apparatus of the present invention.

Figure 7 is a block diagram showing an embodiment of a microphone testing device of the present invention.

Figure 8 is a block diagram showing another embodiment of a microphone testing device of the present invention.

9 is a flow chart of a microphone testing method of the present invention.

The present invention will be described in detail in conjunction with the embodiments and the accompanying drawings, and those skilled in the art can readily appreciate other advantages of the present invention from the disclosure herein. And efficacy. The present invention may be embodied or applied in various other specific embodiments. The details of the present invention can be variously modified and changed without departing from the spirit and scope of the invention. Therefore, the present invention is not limited thereto, and the present invention is also widely applicable to other embodiments, and the present invention is not limited to any embodiment. It should be based on the scope of the patent application and its equivalent fields.

Referring to FIG. 1 to FIG. 6 , an embodiment of the present invention provides a microphone testing device for testing a microphone module M to be assembled ( FIG. 6 ). Microphone measurement according to an embodiment of the present invention The test equipment basically comprises a test box 1, a cylinder 2, and a main control module 3.

The test box 1 has a body 11 , a first accommodating space 12 and a second accommodating space 13 formed inside the body 11 , a bottom plate 14 at the bottom of the body 11 , and a first cover plate at the top of the body 11 . 15 and a second cover plate 16. In some embodiments, the first accommodating space 12 and the second accommodating space 13 can be an accommodating space. The first cover plate 15 and the second cover plate 16 can be an integrally connected cover plate.

The cylinder 2 is housed in a first accommodating space 12 having a cylindrical upper acoustic cavity 21 formed in the upper half of the cylinder 2 and a cylindrical lower acoustic cavity 22 formed in the lower half of the cylinder 2 And a partition plate 23 formed between the upper acoustic chamber 21 and the lower acoustic chamber 22. The center position of the partitioning plate 23, which can also be said to be the center of the circle, is formed with an opening 231. The lower acoustic chamber 22 is provided with a speaker 221, and the speaker 221 faces the upper acoustic chamber 21 through the opening 231 of the partitioning plate 23. The bottom plate 14 is for closing the lower acoustic cavity 22, and the first cover plate 15 is for closing the upper acoustic cavity 21, and in order to better close the lower acoustic cavity 22 and the upper acoustic cavity 21, the bottom plate 14 and the cylinder for the bottom plate 14 and the first cover plate 15 An O-ring may be disposed between the two, and an O-ring may be disposed between the first cover 15 and the cylinder 2. Therefore, the cylinder 2 can be divided into two separate upper acoustic chambers 21 and lower acoustic chambers 22 by the first cover plate 15, the partition plate 23, and the bottom plate 14, and the upper acoustic chamber 21 and the lower acoustic chamber 22 are respectively rounded. The cylindrical shape, and the speaker 221 is disposed at the center of the partition plate 23, so that the sound is reflected by the wall surface of the sound chamber is equal, so when the speaker 221 sends a test signal (such as: 1 kHz sound signal), it can be closed. A low frequency stable sound field is formed in the acoustic cavity 22, and a uniformly reflected test sound source is formed in the upper acoustic cavity 21 for reception by the microphone module M to be assembled.

In order to receive the test sound source for the microphone module M to be assembled, the first cover 13 may form at least one sound hole 151. In some embodiments, the microphone module M to be assembled may have two microphone units, and the number of the sound holes 151 may be two in order to simultaneously test the two microphone units on the microphone module M to be assembled. Furthermore, The two sound holes 151 are respectively oblong and correspond to positions above the diameter of the spacer 23 (see Fig. 5). Furthermore, in order to enable different size specifications of the microphone module M to be assembled to be disposed on the first cover 15 and facing the sound hole 151, the first cover 15 may also be provided with a fixing plate 152 to adapt to different sizes. Specifications of the microphone module M to be assembled. Further, the fixing plate 152 forms at least one through hole 1521, and the number of the through holes 1521 can be two, and the two through holes 1521 can respectively correspond to the positions of the two sound holes 151, thereby being assembled on the microphone module M. The two microphone units can face the two sound holes 151 via the two through holes 1521. Furthermore, the two through holes 1521 can be opened in a receiving groove 1522 of the fixing plate 152, and the contour of the receiving groove 1522 corresponds to the microphone module M to be assembled. In addition, in order to increase the sealing property to prevent leakage, the first cover plate 15 may further be provided with a pressure cover plate 153, and the pressure cover plate 153 can rotatably press the fixing plate 152 and the microphone module M to be assembled, and the pressure cover plate A sound insulation cotton 1531 is also arranged at the bottom of the 153 to further increase the anti-leakage effect.

The main control module 3 is housed in the second accommodating space 13. The main control module 3 is electrically connected to the speaker 221 and has a key test button 321 exposed to the second cover 16 . In this embodiment, the main control module 3 includes a first circuit board 31 and a second circuit board 32. The first circuit board 31 is electrically connected to the second circuit board 32, and the first circuit board 31 can be fixed to the bottom board. 14. The second circuit board 32 can be fixed to the second cover 16 and the second circuit board 32 is provided with the aforementioned one-key test button 321.

In some embodiments, as shown in FIG. 7, the first circuit board 31 can be provided with a micro processing unit 311, a signal generating unit 312, and a power amplifying unit 313. The signal generating unit 312 is electrically connected to the micro processing unit 311, the power amplifying unit 313 is electrically connected to the signal generating unit 312, and the power amplifying unit 313 is electrically connected to the speaker 221. The micro processing unit 311 can be an integrated single chip, and can include a control chip such as a microprocessor (MCU), a digital signal processor (DSP), and the microprocessor 311 has a built-in program for inputting, outputting, and analyzing signals. Operation. Micro processing unit 311 A control signal is generated to the signal generating unit 312 according to a button signal generated by the one-key test button 321 . The signal generating unit 312 is configured to generate a test signal, that is, a 1 kHz sound signal, to power amplification according to the control signal. The unit 313 amplifies the test signal by the power amplifying unit 313 and then sends it out by the speaker 221. The microphone module M is configured to generate a response signal to the micro processing unit 311 according to the test signal, so that the micro processing unit 311 analyzes the radio result of the microphone module M to be assembled according to the response signal.

In some embodiments, as shown in FIG. 8 , the first circuit board 31 can be provided with a micro processing unit 311 and a power amplifying unit 313 , and the micro processing unit 311 is configured to facilitate detailed operation and viewing results by some professional testers. The power amplifying unit 313 can be electrically connected to a test host 4, for example, a computer having a test program for data analysis processing and a sound card for generating a test signal, such as a 1 kHz sound signal. The micro processing unit 311 is configured to generate a control signal to the test host 4 according to a button signal generated by the one-key test button 321 , and the test host 4 is configured to generate the test signal according to the control signal, that is, a 1 kHz sound signal. To the power amplifying unit 313, the test signal is amplified by the power amplifying unit 313 and then emitted by the speaker 221. The microphone module M is configured to generate a response signal according to the test signal and output it to the test host 4 via the micro processing unit 311, so that the test host 4 analyzes the radio result of the microphone module M to be assembled according to the response signal.

Furthermore, in order to fine-tune the correction volume, the first circuit board 31 may be provided with a variable resistor 314 electrically connected to the power amplifying unit 313. In addition, the first circuit board 31 may further be provided with a power interface 315 for connecting an external power source, a sound source interface 316 for connecting to the test host 4, and a signal interface 317 for connecting to the test host 4.

Moreover, in order to facilitate the tester to view the operating state, the second circuit board 32 may be provided with an indicating unit 322 exposed to the second cover plate 16, and the indicating unit 322 may be, for example, LCD screen or multiple indicators to indicate operational status. In addition, in order to cooperate with various different specifications of the microphone module M to be assembled, the second circuit board 32 may also be provided with an adapter plate 323 exposed to the second cover plate 16, and the adapter plate 323 and the microphone module M to be assembled. The electrical connection can be further formed through a turn wiring (not shown).

9 is a flowchart of the present invention. The invention further provides a microphone testing method, which comprises the following steps:

(S103) A microphone test apparatus as described above is provided.

(S105) A standard microphone module is provided. In detail, according to the size specifications of the standard microphone module provided, the standard microphone module is placed on the adapted fixing plate 152, and the fixing plate 152 is fixed on the first cover 15 to make the standard microphone module. Facing the sound hole 151. The selection of the standard microphone module takes one hundred data from the quantity of the microphone module M to be assembled, and the data closest to the center point is the standard microphone module.

(S107) A test signal of the microphone test device is corrected using a standard microphone module. In detail, the microphone test device sends a test signal, and uses a standard microphone module to measure a sensitivity, and then determines whether the sensitivity of the standard microphone module is within a preset range, thereby correcting the test signal sent by the microphone test device. The test signal can be generated by the test host 4 or the signal generating unit 312 of the microphone test device and sent by the speaker 221. In addition, the variable signal 314 can be used to fine tune the test signal sent by the microphone test equipment as compensation, so that the sensitivity measured by the standard microphone quantity is within a preset range.

(S109) providing a microphone module to be assembled. In detail, after the calibration is completed, the standard microphone module can be taken out, and the microphone module M to be assembled is placed on the matching fixing plate 152, and the fixing plate 152 is fixed on the first cover plate 15 to be assembled. The microphone module M faces the sound hole 151.

(S111) The microphone module to be assembled is tested with the corrected test signal. detailed In other words, the calibrated test signal is sent through the microphone test device, so that the microphone module M to be assembled generates a response signal according to the corrected test signal.

(S113) analyzing the sound collection result of the microphone module to be assembled according to the response signal, and determining whether the microphone module to be assembled is qualified. In detail, the sound collection result of the microphone module M to be assembled can be analyzed by the micro processing unit 311 or the test host 4, and the sound collection result of the microphone module M to be assembled is the sensitivity and total harmonic of the microphone module M to be assembled. Distortion and signal-to-noise ratio, and determine whether the sensitivity, total harmonic distortion and signal-to-noise ratio of the microphone module M to be assembled are within a preset range. If yes, a qualified signal is issued, if otherwise, an alarm signal is issued. In addition, the indicator signal or the alarm signal may be displayed by the indication unit 322, or the operation signal or the alarm signal may be displayed by the operation interface of the test host 4.

In summary, the microphone testing device and the method thereof provided by the embodiments of the present invention can divide the cylinder 2 into two separately closed upper acoustic cavities 21 by the first cover plate 15, the isolating plate 23, and the bottom plate 14. And the lower acoustic cavity 22, and since the upper acoustic cavity 21 and the lower acoustic cavity 22 are respectively cylindrical, and the speaker 221 is disposed at the center position, the sound is reflected from the wall surface of the acoustic cavity to the center by the same distance, so when the speaker 221 sends a test signal A low-frequency stable sound field can be formed in the closed lower acoustic cavity 22, and a uniformly reflected test sound source is formed in the upper acoustic cavity 21 for the microphone module M to be assembled, so that it is not necessary to additionally lay a large sound-absorbing cotton on the wall of the acoustic cavity. Preventing the phenomenon of irregular reflection of sound, in addition to saving cost, can avoid the incomplete reflection of sound absorption and affect the accuracy of the test. Moreover, since the main control module 3 has a one-key test key 321 , all tests can be completed with only one press, and the test convenience is increased without the need to configure professional testers for operation and maintenance.

The above is only the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Therefore, the equivalent changes of the present invention and the contents of the drawings are all included in the protection of the present invention. Within the scope, it is combined with Chen Ming.

Claims (10)

A microphone testing device for testing a microphone module to be assembled having two microphone units spaced apart from each other, the microphone testing device comprising: a test box having a body and a first part formed inside the body An accommodating space and a second accommodating space, a bottom plate at the bottom of the body, a first cover plate and a second cover plate at the top of the body; a cylinder received in the first accommodating space The cylinder has a cylindrical upper acoustic cavity formed in the upper half of the cylinder, a cylindrical lower acoustic cavity formed in the lower half of the cylinder, and a middle formed between the upper acoustic cavity and the lower acoustic cavity. a partitioning plate having an opening formed at a central position thereof, the lower acoustic chamber being provided with a speaker, the speaker facing the upper acoustic cavity through the opening, the bottom plate for closing the lower acoustic cavity, the first cover plate for closing the upper acoustical cavity a sound chamber, and the first cover plate forms two sound holes, the two sound holes are respectively elongated and corresponding to the position above the diameter of the spacer; and a main control module is accommodated in the second Accommodating space, the main The module is electrically connected to the speaker, and the main control module has a key test button exposed to the second cover, and the one-key test button can be pressed to perform a one-key test, so that the speaker emits a The test signal is formed in the upper acoustic cavity to form a test sound source for receiving by the microphone module to be assembled. The microphone testing device of claim 1, wherein the first cover is provided with a fixing plate adapted to the microphone module to be assembled, the fixing plate forms two through holes, and the two through holes correspond to The positions of the two sound holes, the microphone module to be assembled can face the two sound holes through the two through holes. The microphone test device of claim 2, wherein the first cover plate is provided with a pressure cover plate, the pressure cover plate rotatably presses the fixed plate and the microphone module to be assembled, and the bottom of the pressure cover plate A soundproof cotton is provided. The microphone test device of claim 1, wherein the main control module comprises a first circuit board and a second circuit board, and the first circuit board is electrically connected to the second circuit board, the first circuit board Fixed to the bottom plate, the second circuit board is fixed to the second cover plate, and the second circuit board is provided with the one-key test button. The microphone test device of claim 4, wherein the first circuit board is provided with a micro processing unit, a signal generating unit and a power amplifying unit, wherein the signal generating unit is electrically connected to the micro processing unit, and the power amplifying unit is electrically The signal generating unit is connected to the speaker, and the power amplifying unit is electrically connected to the speaker, and the micro processing unit is configured to generate a control signal to the signal generating unit according to a button signal generated by the one-key test button, and the signal is generated. The unit is configured to generate the test signal to the power amplifying unit according to the control signal, so that the test signal is amplified by the power amplifying unit and sent by the speaker, and the microphone module to be assembled is used to generate a response according to the test signal. The signal is sent to the micro processing unit, so that the micro processing unit analyzes the radio result of the microphone module to be assembled according to the response signal. The microphone test device of claim 4, wherein the first circuit board is provided with a micro processing unit and a power amplifying unit, wherein the micro processing unit and the power amplifying unit are respectively electrically connected to a test host, and the micro processing unit is used for Generating a control signal to the test host according to a button signal generated by the one-key test button, the test host is configured to generate a test signal according to the control signal to the power amplifying unit, so that the test signal passes through the power amplifying unit After being amplified, the speaker module is configured to generate a response signal according to the test signal, and output the response signal to the test host via the micro processing unit, so that the test host analyzes the microphone module to be assembled according to the response signal. The radio result of the group. The microphone test device of claim 4, wherein the first circuit board is provided with a variable resistor for fine-tuning the test signal. A microphone test method comprising the steps of: Providing a microphone test device according to any one of claims 1 to 7, providing a standard microphone module; using the standard microphone module to correct a test signal of the microphone test device; providing a microphone module to be assembled; The calibrated microphone module tests the microphone module to be assembled, and the microphone module to be assembled generates a response signal according to the corrected test signal; and analyzes the sound collection result of the microphone module to be assembled according to the response signal. It is determined whether the microphone module to be assembled is qualified. The microphone test method of claim 8, wherein the step of correcting the test signal of the microphone test device by using the standard microphone module is to measure a sensitivity by using the standard microphone module, and determine the sensitivity of the standard microphone. Whether the test signal of the microphone test equipment is corrected according to whether it is within a preset range. The microphone test method of claim 8, wherein the sound collection result of the microphone module to be assembled is sensitivity, total harmonic distortion, and signal to noise ratio of the microphone module to be assembled.