Sound isolation test system and sound isolation test method

Abstract

The present disclosure discloses a sound isolation test system for testing a test piece having a sound receiving hole. The sound isolation test system includes a test fixture and an air pressure detector. The test fixture includes an air duct cover that seals the sound receiving hole. The air pressure detector is electrically connected to the test fixture and determines the rate of change of the gas pressure in the sound receiving hole and calculates the sound isolation of the test piece based on the rate of change of the gas pressure. Furthermore, the present disclosure discloses a sound isolation test method.

Description

Technical Field

[0001] The present disclosure relates to a sound isolation test system and a test method for a test product, and in particular to a sound isolation test system and a test method based on a gas pressure change rate. Background Art

[0002] The microphone's sound isolation affects the accuracy of algorithms such as echo suppression and direction recognition. To reduce misjudgments in audio algorithms, the microphone structure must be designed to meet a certain level of sound isolation to prevent sound from entering the microphone from unintended routes, potentially leading to misjudgments. Figure 1 This is a schematic diagram of the structure of a microphone. Microphone A includes a housing A11, an audio processing circuit A12, a printed circuit board A13, two sound isolation panels A14, and a sound receiving hole A15. Sound receiving hole A15 is provided through housing A11. The two sound isolation panels A14 are connected between housing A11 and printed circuit board A13. Audio control circuit A12 is electrically connected to printed circuit board A13. Ideally, if microphone 2 is properly assembled with no gaps, sound will only enter microphone A's sound receiving hole A15 through the first path S. However, if microphone A has gaps due to assembly defects, sound may enter microphone A's interior through the second and third paths S2 and S3, in addition to entering through the sound receiving hole A15.

[0003] Currently, microphone sound isolation testing involves first transmitting a sound signal of a predetermined loudness through a sound source. Upon receiving the sound signal, the microphone converts it into a first voltage signal. Next, the microphone's sound receiving port is blocked with clay. A sound signal of the same loudness is then transmitted through the sound source. Because the microphone's sound receiving port is blocked, the energy of the sound signal received by the microphone is reduced. Therefore, the voltage value of the second voltage signal converted from the sound signal received by the microphone should be smaller than the voltage value of the first voltage signal. The greater the difference between the second voltage signal and the first voltage signal, the greater the difference in sound isolation, indicating that sound can only enter the microphone through the sound receiving port.

[0004] However, executing the aforementioned test method requires a certain level of ambient noise and pre-setup of multiple devices, such as the motherboard, processor, and memory, to control the microphone for recording and file conversion. This results in a test time of nearly an hour from equipment setup to completion, which is very inefficient for R&D personnel and is also very disadvantageous for production line testing. Summary of the Invention

[0005] The technical problem to be solved by the present disclosure is to provide a sound isolation test system and a sound isolation test method to address the deficiencies of the existing technology.

[0006] To solve the above-mentioned technical problems, one of the technical solutions adopted by the present disclosure is to provide a sound isolation test system for testing a test product having a sound receiving hole. The sound isolation test system includes a test fixture and an air pressure detector. The test fixture includes an air duct cover, which seals the sound receiving hole. The air pressure detector is electrically connected to the test fixture, and the air pressure detector determines the rate of change of the gas pressure in the sound receiving hole and calculates the sound isolation of the test product based on the rate of change of the gas pressure.

[0007] In order to solve the above-mentioned technical problems, another technical solution adopted in the present disclosure is to provide a sound isolation test method for testing a test product, which is provided with a sound receiving hole. The sound isolation test method includes: inflating or deflating the sound receiving hole; stopping inflating or deflating the sound receiving hole based on the gas pressure in the sound receiving hole reaching the target pressure; recording the gas pressure change in the sound receiving hole to obtain the gas pressure change rate; and calculating the sound isolation of the test product based on the gas pressure change rate.

[0008] One of the benefits of this disclosure is that the sound isolation test system and method provided herein can eliminate the need for traditional sound measurement methods, achieving rapid sound isolation results. This not only ignores ambient noise factors but also eliminates the need to manipulate the test product, significantly shortening the time required to obtain sound isolation results. Furthermore, the sound isolation test of the test product can be performed without the need for extensive instrument setup or stringent environmental requirements.

[0009] To further understand the features and technical contents of the present disclosure, please refer to the following detailed description and drawings of the present disclosure. However, the drawings provided are only for reference and illustration and are not intended to limit the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 Schematic diagram of the microphone structure.

[0011] Figure 2 FIG. 1 is a schematic diagram of a sound isolation test system according to a first embodiment of the present disclosure.

[0012] Figure 3 for Figure 2 Functional block diagram of the air pressure detector.

[0013] Figure 4 FIG. 4 is a schematic diagram of a sound isolation test system according to a second embodiment of the present disclosure.

[0014] Figure 5 Flowchart of the sound isolation testing method according to the first embodiment of the present disclosure.

[0015] Figure 6 This is a graph showing the relationship between the gas pressure in the sound receiving hole and time.

[0016] Figure 7 Flowchart of the sound isolation testing method according to the second embodiment of the present disclosure.

[0017] Figure 8 Flowchart of the sound isolation testing method according to the third embodiment of the present disclosure.

[0018] The description of the accompanying drawings is as follows:

[0019] A: Microphone

[0020] A11: Housing

[0021] A12: Audio processing circuit

[0022] A13: Printed Circuit Board

[0023] A14: Sound isolation board

[0024] A15: Sound receiving hole

[0025] S1: First Path

[0026] S2: Second Path

[0027] S3: The Third Path

[0028] 1: Sound isolation test system

[0029] 11: Detection fixture

[0030] 111: Base

[0031] 113: Gas pipeline

[0032] 115: Tracheal mask

[0033] 117: Pressure Generator

[0034] 119: Control valve

[0035] 13: Air pressure detector

[0036] 131: Detection circuit

[0037] 133: Controller

[0038] 135: Memory

[0039] 137: Display

[0040] 2: Microphone

[0041] 201: Sound hole

[0042] 202: Audio processing circuit

[0043] S501, S503, S505, S507, S509, S511, S701, S703, S705, S707,

[0044] S709, S711, S801, S803, S805, S807, S809, S811, S813, S815, S817,

[0045] S819, S821: Steps DETAILED DESCRIPTION

[0046] The following is an explanation of the implementation methods of the "sound isolation test system and sound isolation test method" disclosed in the present disclosure through specific embodiments. Those skilled in the art can understand the advantages and effects of the present disclosure from the contents disclosed in this specification. The present disclosure can be implemented or applied through other different specific embodiments, and the details in this specification can also be modified and changed based on different viewpoints and applications without departing from the concept of the present disclosure. In addition, the drawings of the present disclosure are only simple schematic illustrations and are not depicted according to actual dimensions. Please note in advance. The following embodiments will further explain the relevant technical contents of the present disclosure in detail, but the disclosed contents are not intended to limit the scope of protection of the present disclosure.

[0047] It should be understood that although terms such as "first," "second," and "third" may be used herein to describe various components or signals, these components or signals should not be limited by these terms. These terms are primarily used to distinguish one component from another, or one signal from another. In addition, the term "or" as used herein may include any one or more combinations of the associated listed items, depending on the actual situation.

[0048] In order to quickly test the sound isolation of a microphone, the sound isolation test system and sound isolation test method provided by the present disclosure do not require any control instructions to the microphone. Instead, air is inflated or evacuated through the microphone's sound receiving hole until the gas pressure in the sound receiving hole reaches the target pressure. If the microphone has no other gaps besides the sound receiving hole, theoretically, the gas pressure in the sound receiving hole can be continuously maintained at the target pressure. On the contrary, if the microphone has other gaps besides the sound receiving hole, the gas in the sound receiving hole will leak out through the gaps, causing the gas pressure in the sound receiving hole to gradually decrease. The air pressure detector can calculate the sound isolation of the microphone based on the rate of change of the gas pressure in the microphone's sound receiving hole.

[0049] Figure 2 FIG. 1 is a schematic diagram of a sound isolation test system according to the first embodiment of the present disclosure. Figure 2As shown, an acoustic isolation test system 1 is used to test the acoustic isolation of a microphone 2. The microphone 2, as a test object, includes a sound receiving hole 201 and an audio processing circuit 202. The acoustic isolation test system 1 includes a test fixture 11 and an air pressure detector 13, which is electrically connected to the test fixture 11. The test fixture 11 includes a base 111, a gas line 113, an air pipe cover 115, a pressure generator 117, and a control valve 119.

[0050] The base 111 of the detection fixture 11 is used to carry and fix the microphone 2. The gas pipeline 113 includes a first end and a second end opposite to the first end. The tracheal cover 115 is assembled to the first end of the gas pipeline 113, and the tracheal cover 115 seals the sound receiving hole 201, so that a closed space is formed between the tracheal cover 115 and the inner wall of the sound receiving hole 201. The second end of the gas pipeline 113 is connected to the pressure generator 117. The control valve 119 is assembled between the first end and the second end of the gas pipeline 113. The control valve 119 is, for example, an air pressure valve and is normally in a closed state. At this time, the gas pressure in the closed space between the tracheal cover 115 and the inner wall of the sound receiving hole 201 will not be affected by the pressure generator 117. When the pressure generator 117 is inflated or deflated, the control valve 117 switches from a closed state to an open state. When the control valve 119 is in the open state, the pressure generator 117 can inflate or deflat the enclosed space between the tracheal mask 115 and the inner wall of the sound receiving hole 201 through the gas pipeline 113, that is, the pressure generator 117 inflates or deflates the sound receiving hole 201 to change the gas pressure in the sound receiving hole 201.

[0051] Figure 3 for Figure 2 Functional block diagram of the air pressure detector 13. Figure 2 and Figure 3 The air pressure detector 13 includes a detection circuit 131, a controller 133, a memory 135, and a display 137. The detection circuit 131 is connected to the gas pipeline 113 of the testing jig 1 to detect the gas pressure within the sound receiving hole 201. The controller 133 is electrically connected to the detection circuit 131 and the pressure generator 117 of the testing jig 11. The controller 133 is set with a target pressure and a pressure tolerance time. The memory 135 and the display 137 are respectively electrically connected to the controller 133. The controller 133 obtains the gas pressure within the sound receiving hole 201 detected by the detection circuit 131 and, based on the gas pressure, instructs the pressure generator 117 of the testing jig 11 to inflate or deflate the sound receiving hole 201, or to stop inflate or deflate the sound receiving hole 201. The gas pressure within the sound receiving hole 201 detected by the detection circuit 131 is stored in the memory 135. The display 137 displays a graph showing the relationship between the gas pressure in the sound receiving hole 201 and time.

[0052] Figure 4 Schematic diagram of a sound isolation test system according to a second embodiment of the present disclosure. Figure 4 Sound isolation test system and Figure 2 The main difference of the sound isolation test system is that the pressure generator 117 and the control valve 119 are integrated into one.

[0053] Figure 5 FIG. 1 is a flow chart of the sound isolation test method according to the first embodiment of the present disclosure. Figure 5 As shown. In step S501, the sound hole 201 of the microphone 2 is inflated within the pressure-allowed time. In other embodiments, the sound hole 201 of the microphone 2 may be evacuated instead of inflated. In step S503, it is determined whether the gas pressure in the sound hole 201 reaches the target pressure. When it is confirmed that the gas pressure in the sound hole 201 reaches the target pressure (positive pressure), step S505 is executed. If the sound hole 201 of the microphone 2 is evacuated, the target pressure is negative pressure. In step S505, the inflating of the sound hole 201 is stopped. When it is confirmed that the gas pressure in the sound hole 201 does not reach the target pressure, step S507 is executed. In step S507, the microphone 2 is recorded as a defective product.

[0054] In step S509, after the sound hole 201 of microphone 2 is stopped from being inflated, the change in gas pressure within the sound hole 201 is recorded to obtain the gas pressure change rate. The gas pressure change rate is defined as the change in gas pressure after the sound hole 201 is stopped from being inflated or deflated, divided by the gas pressure change rate per unit time (e.g., 1 second). In step S511, the sound isolation of microphone 2 is calculated based on the target pressure, the pressure tolerance time, and the gas pressure change rate within the sound hole 201, and the sound isolation test method ends. Sound isolation is measured in decibels (dB), with higher decibel values indicating better sound isolation. For example, the sound isolation calculation formula is: F = a*x + b*y + c*z + d, where F is the sound isolation of microphone 2, x is the target pressure, y is the pressure tolerance time, z is the gas pressure change rate within the sound hole 201, and a, b, c, and d are correction parameters. Theoretically, if a user performs multiple sound isolation tests on the same microphone under the same target pressure, the sound isolation measured should be the same each time. Furthermore, z in the calculation formula can be a non-fixed value, meaning it is a function of a curve relative to time, or it can be a fixed value.

[0055] Figure 5 The sound isolation test method can be Figure 2 or Figure 4The sound isolation test system 1 is executed. Specifically, steps S501 and S505 are the result of the controller 133 of the air pressure detector 13 instructing the pressure generator 117 of the testing fixture 1 to inflate the sound receiving hole 201 of the microphone 2 and to stop inflating the sound receiving hole 201 of the microphone 2. Steps S503, S509, and S511 are executed by the controller 133 of the air pressure detector 13, while step S507 is executed by the memory 135.

[0056] Understandably, Figure 5 The sound isolation test method can also be performed by other air pressure test devices and is not limited to Figure 2 or Figure 4 For example, the supply of gas in the sound receiving hole 201 and the detection of the gas pressure in the sound receiving hole 201 can be performed by the air pressure detector 13 .

[0057] Figure 6 This is the relationship between the gas pressure in the microphone's sound receiving hole and time. Figure 6 As shown, the air pressure inside the sound holes of four different microphones M1-M41 is detected simultaneously. The period between time T0 and time T1 represents the pressure tolerance period. The air pressure inside the sound holes of microphones M1-M3 reaches the target pressure, but microphone M4 cannot reach the target pressure. Before time T1, the air pressure inside the sound hole of microphone M4 begins to drop, indicating that microphone M4 may have a serious air leak due to poor assembly, and will be marked as defective. After time T1, air is no longer inflated in the sound holes of the four microphones M1-M4. After this cessation of air inflating, the air pressure inside the sound holes of microphones M1-M3 gradually decreases over time, indicating that microphones M1-M3 have other gaps outside the sound holes, preventing the air pressure inside the sound holes from being maintained at the target pressure. The rate of change of the gas pressure in the sound receiving hole of microphone M1 is smaller than that in the sound receiving hole of microphone M2, and the rate of change of the gas pressure in the sound receiving hole of microphone M2 is smaller than that in the sound receiving hole of microphone M3. Since the rate of change of the gas pressure in the sound receiving hole of microphone M1 is the smallest, it means that microphone M1 has the best sound isolation.

[0058] Figure 7 Flowchart of the sound isolation testing method according to the second embodiment of the present disclosure. Figure 7 The sound isolation test method of the second embodiment is compared with Figure 5The main difference of the sound isolation test method of the first embodiment is that the memory 135 of the air pressure detector 13 stores a lookup table that records multiple different air pressure change rates and their corresponding sound isolation values. When the air pressure detector 3 detects the air pressure change rate in the sound receiving hole 201 of the microphone 2, the corresponding sound isolation value can be found through the lookup table. Figure 7 The detailed steps are described below.

[0059] In step S701, the sound receiving hole 201 of the microphone 2 is inflated within the pressure-allowed time. In other embodiments, the sound receiving hole 201 of the microphone 2 may be evacuated instead of inflated. In step S703, it is determined whether the gas pressure in the sound receiving hole 201 of the microphone 2 has reached the target pressure. When it is confirmed that the gas pressure in the sound receiving hole 201 of the microphone 2 has reached the target pressure, step S705 is executed. In step S705, the inflating of the sound receiving hole 201 of the microphone 2 is stopped. When it is confirmed that the gas pressure in the sound receiving hole 201 of the microphone 2 has not reached the target pressure, step S707 is executed. In step S707, the microphone 2 is recorded as a defective product.

[0060] In step S709, after stopping the inflation of sound receiving hole 201 of microphone 2, the change in gas pressure within sound receiving hole 201 of microphone 2 is recorded to obtain the gas pressure change rate. In step S711, the sound isolation corresponding to the gas pressure change rate within sound receiving hole 201 is found using a lookup table, and the sound isolation test method ends.

[0061] Figure 7 The sound isolation test method can be Figure 2 or Figure 4 The sound isolation test system 1 is executed. Specifically, steps S701 and S705 are the controller 133 of the air pressure detector 13 instructing the pressure generator 117 of the testing fixture 1 to inflate the sound receiving hole 201 of the microphone 2 and to stop inflating the sound receiving hole 201 of the microphone 2. Steps S703, S709, and S711 are executed by the controller 133 of the air pressure detector 13, while step S707 is executed by the memory 137.

[0062] Understandably, Figure 7 The sound isolation test method can also be performed by other air pressure test devices and is not limited to Figure 2 or Figure 4 The sound isolation test system 1 is used to perform the test.

[0063] Different target pressures allow for different sound isolation ranges. For example, when inflating, the target pressure can be set to 0.8 atm. For deflating, the target pressure can be set to 0.1 atm. When the target pressure is set to 0.8 atm, the sound isolation range is 10dB to 20dB, with 10dB and 20dB being the lower and upper thresholds, respectively. When the target pressure is set to 1.2 atm, the sound isolation range is 21dB to 30dB, with 21dB and 30dB being the lower and upper thresholds, respectively. Therefore, if the measured sound isolation equals the lower threshold, it indicates that the sound isolation of microphone 2 may actually be below the lower threshold, so the target pressure should be lowered and the sound isolation test performed again. Conversely, if the measured sound isolation equals the upper threshold, it indicates that the sound isolation of microphone 2 may actually be above the upper threshold, so the target pressure should be increased and the sound isolation test performed again. In view of this, the present disclosure provides a third embodiment of a sound isolation testing method.

[0064] Figure 8 FIG. 1 is a flow chart of a sound isolation test method according to the third embodiment of the present disclosure. Figure 8 As shown, in step S801, the sound receiving hole 201 of the microphone 2 is inflated within the pressure-allowed time. In other embodiments, the sound receiving hole 201 of the microphone 2 may be evacuated instead of inflated. In step S803, it is determined whether the gas pressure in the sound receiving hole 201 of the microphone 2 has reached the target pressure. When it is confirmed that the gas pressure in the sound receiving hole 201 of the microphone 2 has reached the target pressure, step S805 is executed. In step S805, the inflating of the sound receiving hole 201 of the microphone 2 is stopped. When it is confirmed that the gas pressure in the sound receiving hole 201 of the microphone 2 has reached the target pressure, step S807 is executed. In step S807, the microphone 2 is recorded as a defective product.

[0065] In step 809, after stopping the inflation of the sound receiving hole 201 of microphone 2, the change in gas pressure within the sound receiving hole 201 of microphone 2 is recorded to obtain the gas pressure change rate. In step S811, the sound isolation of microphone 2 is calculated based on the target pressure, the pressure tolerance time, and the gas pressure change rate within the sound receiving hole 201. In step S813, a determination is made as to whether the sound isolation is equal to the lower critical value of the sound isolation range. If the sound isolation is equal to the lower critical value, step S815 is executed. In step S815, the target pressure is lowered, and the process returns to step S801.

[0066] If the sound isolation is not equal to the lower critical value, step S817 is executed. In step S817, a determination is made as to whether the sound isolation is equal to the upper critical value of the sound isolation range. If the sound isolation is equal to the upper critical value, step S819 is executed. In step S819, the target pressure is increased, and the process returns to step S801. If the sound isolation is not equal to the upper critical value, step S821 is executed. In step S821, the sound isolation test method ends.

[0067] Figure 8 The sound isolation test method can be Figure 2 or Figure 4 The sound isolation test system 1 is executed. Specifically, steps S801 and S805 are the result of the controller 133 of the air pressure detector 13 instructing the pressure generator 117 of the testing fixture 1 to inflate the sound receiving hole 201 of the microphone 2 and to stop inflation of the sound receiving hole 201 of the microphone 2. Steps S803, S809, and S811-S819 are executed by the controller 133 of the air pressure detector 13, while step S807 is executed by the memory 137.

[0068] Understandably, Figure 8 The sound isolation test method can also be performed by other air pressure test devices and is not limited to Figure 2 or Figure 4 The sound isolation test system 1 is used to perform the test.

[0069] One of the benefits of this disclosure is that the sound isolation test system and method provided herein can eliminate the need for traditional sound measurement methods, achieving rapid sound isolation results. This not only ignores ambient noise factors but also eliminates the need to manipulate the test product, significantly shortening the time required to obtain sound isolation results. Furthermore, the sound isolation test of the test product can be performed without the need for extensive instrument setup or stringent environmental requirements.

[0070] The above disclosed contents are only preferred feasible embodiments of the present disclosure and are not intended to limit the claims of the present disclosure. Therefore, all equivalent technical changes made using the description and drawings of the present disclosure are included in the claims of the present disclosure.

Claims

1. A sound isolation test system for testing a test product having a sound receiving hole, the sound isolation test system comprising: A testing fixture comprising an airway cover, wherein the airway cover seals the sound receiving hole; as well as an air pressure detector electrically connected to the testing fixture, wherein the air pressure detector determines a rate of change of air pressure in the sound receiving hole and calculates a sound isolation of the test object based on the rate of change of air pressure, a target pressure, and a pressure tolerance time; Among them, F=a*x+b*y+c*z+d, where F is the sound isolation of the test product, x is the target pressure, y is the pressure allowable time, z is the rate of change of the gas pressure in the sound receiving hole, and a, b, c and d are correction parameters.

2. The sound isolation test system as claimed in claim 1, wherein the testing fixture further comprises a gas pipeline and a pressure generator, and two ends of the gas pipeline are respectively connected to the tracheal mask and the pressure generator.

3. The sound isolation test system as described in claim 2, wherein the testing fixture further includes a control valve, the control valve being connected to the gas pipeline, and when the pressure generator is inflating or deflating, the control valve is in an open state, and when the pressure generator stops inflating or deflating, the control valve is in a closed state.

4. The sound isolation testing system as claimed in claim 2, wherein the air pressure detector comprises a detection circuit and a controller, the detection circuit is connected to the gas pipeline and is used to detect a gas pressure in the sound receiving hole, and the controller is electrically connected to the detection circuit and the pressure generator. 5 . The sound isolation test system as claimed in claim 4 , wherein the air pressure detector further comprises a display, the display being electrically connected to the controller, and the display showing changes in the air pressure in the sound receiving hole. 6 . The sound isolation test system as claimed in claim 4 , wherein the air pressure detector further comprises a memory, the controller is electrically connected to the memory, and the memory stores the change of the air pressure in the sound receiving hole.

7. A sound isolation test method for testing a test product having a sound receiving hole, the sound isolation test method comprising: Inflate or deflat the sound receiving hole within a pressure-allowed time; When a gas pressure in the sound receiving hole reaches a target pressure, stopping the inflation or deflating of the sound receiving hole; Recording a gas pressure change in the sound receiving hole to obtain a gas pressure change rate; and Calculating a sound isolation of the test object according to the gas pressure change rate, the target pressure, and the pressure tolerance time; Among them, F=a*x+b*y+c*z+d, where F is the sound isolation of the test product, x is the target pressure, y is the pressure allowable time, z is the rate of change of the gas pressure in the sound receiving hole, and a, b, c and d are correction parameters.

8. The sound isolation testing method according to claim 7, further comprising: When the sound isolation is equal to an upper critical value of a sound isolation range, the target pressure is increased and the sound isolation of the test product is tested again. When the sound isolation is equal to a lower critical value of the sound isolation range, the target pressure is reduced and the sound isolation of the test product is tested again. 9 . The sound isolation testing method according to claim 7 , wherein when the gas pressure in the sound receiving hole fails to reach the target pressure, the test product is recorded as a defective product.

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