Test device for testing a microphone

Abstract

The invention relates to a test device (1) for testing a microphone (2), having at least one test loudspeaker (3) for generating a test tone (4), having at least one test chamber (5) into which the test tone (4) can be emitted, having at least one accommodation region (7) for accommodating the microphone (2) to be tested, which acoustically couples the microphone (2) to be tested to the test chamber (5), and having at least one reference microphone (8) for determining a reference signal of the test tone (4). The test device (1) has a reference chamber (13) separate from the test chamber (5), into which the test tone (4) is emitted, which is acoustically coupled to the reference microphone (8), and / or the accommodation region (7) is arranged on a first side (6) of the test loudspeaker (3) and the reference microphone (8) is arranged on a second side (9) of the test loudspeaker (3).

Description

Technical Field

[0001] The present invention relates to a testing apparatus for testing a microphone, comprising at least one test loudspeaker for generating at least one test tone, having at least one test cavity into which the test loudspeaker can transmit the test tone, having at least one receiving area for accommodating a microphone to be tested, configured to enable acoustic coupling between the microphone to be tested and the test cavity, and having at least one reference microphone for measuring a reference signal of the test tone emitted by the test loudspeaker. Background Technology

[0002] WO 2016 / 111983 A1 discloses a testing system for microphones. This testing apparatus includes a loudspeaker capable of transmitting test sounds into a test chamber. The test chamber contains a microphone to be tested and a reference microphone. Summary of the Invention

[0003] Therefore, the purpose of this invention is to improve upon the prior art.

[0004] The solution of the present invention to achieve the above objectives is a testing device.

[0005] A testing apparatus for testing microphones is proposed. This apparatus can, for example, verify whether a microphone is picking up sound distortedly, thereby identifying microphones that are not functioning properly.

[0006] The testing apparatus includes at least one test loudspeaker for generating at least one test tone. The test loudspeaker can also be used to generate a test sequence, which may include several test tones with different frequencies and / or volumes. The test tones are acquired by a microphone under test, which generates a signal accordingly. This signal can be evaluated to verify that the microphone is functioning correctly.

[0007] The testing apparatus further includes at least one testing chamber, into which the testing loudspeaker can send test sounds.

[0008] The test apparatus includes at least one receiving area for accommodating a microphone to be tested, the receiving area being configured to acoustically couple the microphone to be tested to the test cavity. Thus, when the microphone to be tested is inserted into the test apparatus, the microphone is acoustically connected to the test cavity. This couples the microphone to be tested to the test cavity. Consequently, the microphone to be tested can capture test sounds within the test cavity. If the microphone to be tested is positioned within the receiving area, this microphone is connected to or coupled to the test cavity. The receiving area is, for example, part of the test cavity, and / or, for example, defines the test cavity. The receiving area may also be arranged such that when the microphone to be tested is within the receiving area, the microphone is positioned within the test cavity. When the microphone to be tested is within the receiving area, the microphone is able to capture the test sounds.

[0009] Furthermore, the testing apparatus includes at least one reference microphone for measuring a reference signal of the test tone emitted by the test speaker. The reference microphone can be used to verify, for example, whether the test speaker is emitting the correct test tone. For instance, the test speaker itself may be damaged, which can be determined using the reference microphone.

[0010] According to the present invention, the testing apparatus has a reference cavity separated from the test cavity, into which test tones can also be transmitted, and the reference cavity is acoustically coupled to a reference microphone used for measuring a reference signal. Thus, the microphone under test can acquire the test tones in the test cavity, and the reference microphone can acquire the test tones in the reference cavity. Therefore, the two measurements are separate and thus do not interfere with each other or have only a very small degree of mutual interference.

[0011] As a supplement or alternative, according to the present invention, the receiving area is arranged on a first side of the test speaker, and the reference microphone is arranged on a second side of the test speaker opposite to the first side. In this way, the test speaker is arranged between the reference microphone and the receiving area, and between the microphone to be tested (when the microphone to be tested is located in the receiving area). Therefore, the test speaker is also arranged between the reference microphone and the test cavity. This achieves a compact structure of the testing apparatus when the microphone to be tested is located in the receiving area.

[0012] By placing the reference microphone on the second side of the test speaker, a sandwich structure is formed, which also achieves a compact structure.

[0013] Therefore, the test cavity can be arranged on the first side of the test loudspeaker, and the reference cavity can be arranged on the second side of the test loudspeaker.

[0014] Preferably, the test speaker is configured to emit the test tone toward both its first and second sides. Alternatively, the test speaker is preferably configured to transmit the test tone into both a test cavity and a reference cavity. Alternatively, the test speaker is preferably arranged to emit the test tone toward both its first and second sides. This transmits the test tone to both the microphone under test and the reference microphone. Therefore, both the microphone under test and the reference microphone acquire the same test tone, allowing for comparison of the two acquired signals.

[0015] Preferably, the reference cavity is arranged on the second side of the test loudspeaker.

[0016] Preferably, the test loudspeaker includes a diaphragm for transmitting a test tone into the test cavity. Alternatively, the diaphragm can also transmit the test tone into a reference cavity. Vibration of the diaphragm causes the air in the test cavity and / or the air in the reference cavity to vibrate, thereby generating the test tone.

[0017] The diaphragm can be positioned between the test chamber and the reference chamber. This allows test sounds to be generated simultaneously in both the test and reference chambers through diaphragm vibration. Alternatively, the diaphragm can also separate the test and reference chambers. This ensures that the acoustic characteristics of one chamber do not affect the other.

[0018] Preferably, the testing apparatus has a receiving device for accommodating the microphone to be tested, the receiving device having a receiving area. The receiving device may be arranged on a first side of the test speaker. The receiving device may, for example, have a notch for accommodating the microphone to be tested. The receiving device and / or the notch may be configured to accommodate the microphone to be tested.

[0019] Furthermore, the receiving device preferably has a fixing device for securing the microphone to be tested. This prevents the microphone from detaching from the testing device during testing.

[0020] As a supplement or alternative, the testing device may also have a fixed installation device.

[0021] Furthermore, the mounting device can secure the microphone under test in a compression and / or form-fit manner. The mounting device may, for example, include a spring element to secure the microphone under test.

[0022] Preferably, the test cavity is at least partially formed by the front volume of the test loudspeaker. Alternatively, the test cavity may be at least partially formed by the passageway of the accommodating device and / or the passageway of the accommodating region. Alternatively, the test cavity may be at least partially formed by the first acquisition volume of the microphone under test. This allows for the utilization of existing volumes.

[0023] Preferably, the reference cavity is at least partially formed by the rear volume of the test loudspeaker. Alternatively, the reference cavity may also be formed by a second acquisition volume of a reference microphone. This allows for the utilization of existing volumes.

[0024] Preferably, the test cavity and the reference cavity are spaced apart by a certain distance along the axial direction of the test device. As a supplement or alternative, the at least one test loudspeaker is preferably arranged between the test cavity and the reference cavity.

[0025] Preferably, the front volume, the passageway of the accommodating device and / or the passageway of the accommodating region, and / or the first acquisition volume are arranged coaxially, particularly identically, with each other. It should be noted here and with reference to the following description that the first acquisition volume belongs to the microphone under test. Therefore, the design of the first acquisition volume cannot be affected, or can only be affected to a small extent. However, the volume and / or the passageway can be adjusted according to the first acquisition volume. The front volume and / or the passageway can be constructed such that, when the microphone under test is being tested, the front volume and / or the passageway are arranged coaxially, particularly identically, with the first acquisition volume. With the aid of a coaxial and / or identical design, for example, scattering at the edges can be avoided.

[0026] As a supplement or alternative, the rear volume and the second acquisition volume can be arranged coaxially, particularly equally. This can, for example, reduce scattering as described above. It can also prevent scattering altogether.

[0027] As a supplement or alternative, the front volume, the passage, the rear volume, and the first and / or second acquisition volume have a circular cross-section.

[0028] Preferably, the front volume, the passage, the first collection volume, and / or the diaphragm are arranged in a laterally staggered manner. Alternatively, the rear volume, the second collection volume, and / or the diaphragm may also be arranged in a laterally staggered manner.

[0029] Preferably, the diaphragm of the at least one test loudspeaker is arranged in a laterally oriented manner. Furthermore, the diaphragm of the at least one test loudspeaker may extend laterally, and particularly perpendicularly, to the axial direction. This causes the generated sound waves to radiate axially.

[0030] Preferably, the diaphragm has a surface larger than the cross-section of the front volume. This surface of the diaphragm, or the diaphragm itself, can be parallel to the cross-section. Alternatively, the surface of the diaphragm can also be larger than the cross-section of the passage. Alternatively, the surface of the diaphragm can also be larger than the cross-section of the rear volume. Alternatively, the surface of the diaphragm can also be larger than the cross-section of the test chamber. Alternatively, the surface of the diaphragm can also be larger than the cross-section of the reference chamber. Alternatively, the surface of the diaphragm can also be larger than the cross-section of the first acquisition volume. Alternatively, the surface of the diaphragm can also be larger than the cross-section of the second acquisition volume. The cross-sections of the volumes or chambers can be parallel to each other. Preferably, the surface of the diaphragm points to the surface facing the corresponding volume or chamber. Taking the passage as an example, the advantage of this approach is that since the diaphragm is larger than the passage, the sound waves generated by the diaphragm need to pass through a smaller passage, where the sound pressure increases.

[0031] Preferably, the volume of the front volume is greater than the volume of the passage. As a supplement or alternative, the volume of the front volume is preferably greater than the volume of the first acquisition volume.

[0032] As a supplement or alternative, the volume of the rear volume is preferably larger than the volume of the second acquisition volume. Because the front volume is larger than the passageway or the first acquisition volume, the sound pressure level produced by the test speaker increases when sound enters the passageway or the first acquisition volume from the front volume. The same applies to the rear volume and the second acquisition volume. This allows for the creation of a high sound pressure level for the test microphone.

[0033] Preferably, at least two test speakers are arranged overlappingly along the axial direction of the test device. This enhances the test sound.

[0034] Preferably, with respect to two overlapping test loudspeakers, the rear volume of one loudspeaker and the front volume of the other test loudspeaker are arranged coaxially, in particular equally. This can, for example, reduce scattering.

[0035] Preferably, the at least one test speaker, the at least one reference microphone, and / or the at least one housing are arranged in a single housing. Alternatively, the housing and the housing can be integrally constructed.

[0036] Preferably, the testing apparatus can be used to test multiple microphones. This allows for the simultaneous testing of multiple microphones. As a supplement or alternative, multiple microphones can be housed within the housing area.

[0037] Preferably, for testing multiple microphones, the testing apparatus has multiple receiving areas, multiple test speakers, multiple test cavities, multiple reference microphones, and / or multiple reference cavities. In this case, the number of components required for testing the microphones increases significantly, thus allowing multiple microphones to be tested simultaneously. For testing multiple microphones, the testing apparatus can, for example, be configured to arrange the microphones, particularly in a planar manner, side-by-side. For this purpose, for example, multiple receiving areas can be arranged, particularly in a planar manner, side-by-side.

[0038] Preferably, the microphone to be tested is a MEMS microphone.

[0039] As a supplement or alternative, the at least one test speaker may be a MEMS speaker and / or an electrodynamic speaker.

[0040] As a supplement or alternative, the at least one reference microphone may be a MEMS microphone, an electrostatic microphone, and / or a condenser microphone. Attached Figure Description

[0041] Further advantages of the present invention are described below in the embodiments.

[0042] Figure 1 This is a schematic cross-sectional view of a testing apparatus used for testing microphones.

[0043] Figure 2 This is a schematic cross-sectional view of a test setup for a test microphone, featuring two test speakers.

[0044] Figure 3 A schematic cross-sectional view of a test setup used to test several microphones, and

[0045] Figure 4 This is a schematic cross-sectional view of a test apparatus used to test a microphone. Detailed Implementation

[0046] Figure 1 This is a schematic cross-sectional view of the test apparatus 1 used for testing microphone 2. For ease of explanation, microphone 2 to be tested is shown arranged or inserted into test apparatus 1.

[0047] The test device 1 has an axial direction X and a transverse direction Y perpendicular to the axial direction.

[0048] The test apparatus 1 includes at least one test speaker 3 for generating a test tone 4. The test tone 4 is acquired through a microphone 2 under test. Therefore, the correctness of the microphone 2's operation can be determined based on the evaluation. For example, the microphone 2 may pick up sound distortedly, rendering it unusable.

[0049] The testing apparatus 1 also includes at least one testing cavity 5 into which the testing loudspeaker 3 can transmit a testing tone 4. In the illustrated embodiment, the testing cavity 5 is arranged on the first side 6 of the testing loudspeaker 3.

[0050] The test apparatus 1 also includes at least one receiving area 7 for accommodating the microphone 2 to be tested. The receiving area 7 is configured to acoustically couple the microphone 2 to be tested with the test cavity 5. In this embodiment, the receiving area 7 also faces or is arranged on the first side 6 of the test speaker 3. In this way, when the microphone 2 to be tested is in the test apparatus 1, the microphone and the test cavity 5 are arranged on the same side, that is, on the first side 6 of the test speaker 3.

[0051] The receiving area 7 is further arranged and / or constructed such that when the microphone 2 to be tested is placed in the receiving area 7, the microphone 2 is coupled and / or connected to the test cavity 5. In this way, the microphone 2 to be tested can acquire the test tone 4 transmitted into the test cavity 5 by the test speaker 3.

[0052] Furthermore, the test apparatus 1 may have a top side 22 and a bottom side 23. For example, a receiving area 7 and a microphone 2 to be tested are provided on the top side 22. For example, a reference microphone 8 is provided on the bottom side 23.

[0053] According to this embodiment, the testing device 1 has a receiving device 19 having a receiving region 7. The receiving device 19 may, for example, have a notch 20 shown herein, in which the microphone 2 to be tested can be received in a form-fitting manner, at least in the transverse Y direction. The receiving device 19 and / or the testing device 1 may also have a fixing device, not shown herein, for fixing the microphone 2 to be tested, particularly in a press-fit and / or form-fit manner, in the receiving region 7.

[0054] By evaluating the signals collected by the microphone 2 under test, it can be determined whether the microphone 2 is operating as intended.

[0055] The test tone 4 can, of course, have several frequencies, a frequency response curve, different volumes, and / or a volume response curve, to test the microphone 2 under different frequency and / or volume conditions. More precisely, the test tone 4 is not only a single sound with a specific frequency, but also a sequence of sounds with different volumes. A test sequence can last for several seconds or longer. Therefore, the test speaker can also generate test sequences. The test tone 4 can be a test sequence.

[0056] The testing apparatus 1 also includes a reference microphone 8. The reference microphone 8 serves as a reference. The reference microphone 8 can also be used to verify whether the test speaker 3 emits a predetermined test tone 4. Therefore, the reference signal of the test tone 4 emitted by the test microphone 3 can be measured using the reference microphone 8. This reference signal can then be compared with the signal collected by the microphone 2 under test. For example, if the two signals match, it can be inferred that the microphone 2 under test is functioning correctly.

[0057] In the illustrated embodiment, a reference microphone 8 is arranged on the second side 9 of the test speaker 3. The second side 9 is arranged on the side of the test speaker 3 opposite to the first side 6.

[0058] Therefore, when the microphone 2 to be tested is in the test apparatus 1, the microphone is arranged on the first side 6 of the test speaker 3, and the reference microphone 8 is arranged on the opposite second side 9 of the test speaker 3. This allows for a compact formation of the test apparatus 1 containing the microphone 2. It also creates a space-saving sandwich structure. This structure also has the advantage that the test apparatus 1 only needs to be open at the first side 6 or the top side 22, or only needs to be constructed to allow the microphone 2 to be tested to be inserted into the receiving area 7. The reference microphone 8 and / or the test speaker 3 or the test apparatus 1 can be enclosed on the second side 9 or the bottom side 23.

[0059] The test loudspeaker 3 also has a diaphragm 10 that causes the surrounding air to vibrate, thereby generating sound waves and thus a test tone 4. The diaphragm 10 is offset along the lifting axis H. The test loudspeaker 3 has an actuator (not shown) for this purpose, such as a piezoelectric actuator. As shown here, the diaphragm 10 is capable of vibrating toward the first side 6 and the second side 9. In this embodiment, the lifting axis H is oriented parallel to the axial direction X.

[0060] Furthermore, the test loudspeaker 3 and / or diaphragm 10 are oriented laterally in the Y direction. This allows the sound generated by the test loudspeaker 3 and / or diaphragm 10 to be emitted axially in the X direction. The test loudspeaker 3 and / or diaphragm 10 extend laterally, and particularly perpendicularly, to the axial direction X of the test device 1.

[0061] According to this embodiment, the test speaker 3 is configured to generate a test tone 4 having two test tone portions 11 and 12. According to this embodiment, the first test tone portion 11 is oriented towards a first side 6 of the test speaker 3, and the second test tone portion 12 is radiated or emitted towards a second side 9 of the test speaker 3. Thus, the first test tone portion 11 is oriented towards the microphone 2 to be tested, while the second test tone portion 12 is oriented towards the microphone 8 to be referenced.

[0062] The two test tone sections 11 and 12 are largely the same. Only their amplitudes can be reversed. That is, if the diaphragm 10 shifts towards one of the sides 6 and 9, an overpressure is generated at that point, which manifests as the amplitude of the sound wave. A negative pressure is formed on the opposite side 6 and 9, which also manifests as the amplitude of the sound wave, but in the opposite direction. This can be taken into account when evaluating the reference signal using the signal from the microphone 2 under test.

[0063] In addition, the first test tone section 11 shown here will be sent into or injected into the test cavity 5.

[0064] According to this embodiment, the testing device 1 has a reference cavity 13. The test tone 4 can also be sent into or emitted into the reference cavity 13. Furthermore, a reference microphone 8 is acoustically coupled to the reference cavity 13 to collect the reference tone 4 disposed therein. The second test tone portion 12, shown herein, is sent into the reference cavity 13.

[0065] Reference cavity 13 is arranged on the side of test loudspeaker 3 opposite to test cavity 5. Reference cavity 13 is arranged on the second side 9 of test loudspeaker 3.

[0066] Furthermore, as shown in this embodiment, the diaphragm 10 of the test loudspeaker is arranged between the test cavity 5 and the reference cavity 13. The diaphragm 10 can also hermetically separate the test cavity 5 and the reference cavity 13.

[0067] According to this embodiment, the test loudspeaker 3 also has a front volume 14. The test cavity 5 is at least partially constituted by the front volume 14.

[0068] Furthermore, the receiving device 19 has a passage 15. As a supplement or alternative, the test chamber 5 may be at least partially constituted by the passage 15, as shown herein. The passage 15 also constitutes a volume.

[0069] As a supplement or alternative, the microphone 2 under test also has a first acquisition volume 16. As a supplement or alternative, the test cavity 5 may be at least partially constituted by the first acquisition volume 16, as shown herein.

[0070] According to this embodiment, the front volume 14, the passage 15, and the first acquisition volume 16 constitute the test cavity 5.

[0071] Preferably, as shown herein, the front volume 14, the passage 15, and / or the first acquisition volume 16 are coaxial and / or identical to each other. This avoids edges between transition sections, which could, for example, scatter sound waves. Since the first acquisition volume 16 is assigned to the microphone 2 under test, the front volume 14 and / or the passage 15 can also be adjusted according to the first acquisition volume 16.

[0072] Furthermore, according to this embodiment, the test loudspeaker 3 has a rear volume 17. The reference cavity 13 is at least partially constituted by the rear volume 17.

[0073] The reference microphone 8 also has a second acquisition volume 18. As a supplement or alternative, the reference cavity 13 may be composed of the second acquisition volume 18.

[0074] According to this embodiment, the reference volume 13 is composed of the rear volume 17 and the second acquisition volume 18.

[0075] According to this embodiment, the test apparatus 1 has a housing 21. As shown here, the test speaker 3 and the reference microphone 8 are housed in the housing 21. The housing 21 is also connected to the housing 19. However, the housing 21 may also have a housing area 7. Alternatively, the housing 21 may extend entirely within the bottom side 23, so that the reference microphone 8 is also enclosed.

[0076] Furthermore, preferably, the test cavity 5 and / or reference cavity 13 are constructed to be as small as possible. This increases the sound pressure level in the test cavity 5 and / or reference cavity 13, thereby enabling better testing of the microphone 2, and / or allowing the reference microphone 8 to measure a stronger signal.

[0077] For simplicity, features already described in the previous figures will not be described again. Furthermore, some features may only be described in later figures. Also, for simplicity, the same reference numerals will be used for the same features. Furthermore, for clarity, not all features may be shown in later figures. However, features shown in one or more of the previous figures may also be present in one or more of the later figures. Furthermore, for clarity, some features may only be shown in one or more of the later figures. Nevertheless, features shown in one or more of the later figures may already be present in the previous figures.

[0078] Figure 2 A test apparatus 1 with two test speakers 3a and 3b for testing microphone 2 is shown.

[0079] According to this embodiment, the two test loudspeakers 3a and 3b are arranged overlapping along the X-axis. This increases the sound pressure level in the test cavity 5.

[0080] The two test loudspeakers 3a and 3b each have a diaphragm 10a and 10b, respectively. The first diaphragm 10a is movable along a first lifting axis H1, and the second diaphragm 10b is movable along a second lifting axis H2. The two lifting axes H1 and H2 are parallel to each other. During the operation of the two test loudspeakers 3a and 3b, the two diaphragms 10a and 10b preferably move synchronously, thereby enhancing the generated sound waves. The two lifting axes H1 and H2 are also arranged parallel to the axial direction X.

[0081] The first and / or second test loudspeakers 3a, 3b have front volumes 14a, 14b and / or rear volumes 17a, 17b.

[0082] According to this embodiment, the first test loudspeaker 3a has a first front volume 14a and a first rear volume 17a. According to this embodiment, the second test loudspeaker 3b has a second front volume 14b and a second rear volume 17b.

[0083] Since the two test loudspeakers 3a and 3b are arranged in an overlapping manner, the first rear volume 17a of the first test loudspeaker 3a is positioned above the second front volume 14b of the second test loudspeaker 3b. At least the first rear volume 17a of the first test loudspeaker 3a is coaxial and / or identical to the second front volume 14b of the second test loudspeaker 3b.

[0084] Furthermore, the microphone 2 to be tested is not shown here. The test cavity 5 located above the receiving area 7 is shown here. The first front volume 14a of the first test speaker 3a, the passage 15 of the receiving device 19, and / or the area above the receiving area 7 constitute the test cavity 5. If the microphone 2 to be tested is inserted into the receiving area 7, the microphone 2 is also inserted into the test cavity 5, and / or the test cavity 5 is formed therefrom.

[0085] Furthermore, the unibody housing 21 and the receiving device 19 are shown here. As a supplement or alternative, Figure 1 With regard to the test apparatus 1, and / or with regard to at least one of the following figures, the housing 21 and the receiving device 19 may also be integrally constructed. Thus, the housing 21 may have the receiving device 19, or the receiving device 19 may have the housing 21.

[0086] For simplicity, features already described in the previous figures will not be described again. Furthermore, some features may only be described in later figures. Also, for simplicity, the same reference numerals will be used for the same features. Furthermore, for clarity, not all features may be shown in later figures. However, features shown in one or more of the previous figures may also be present in one or more of the later figures. Furthermore, for clarity, some features may only be shown in one or more of the later figures. Nevertheless, features shown in one or more of the later figures may already be present in the previous figures.

[0087] Figure 3 Test apparatus 1 for testing several microphones 2a–2i is shown. The first three microphones 2a–2c are shown in cross-section here. For a detailed description of test apparatus 1, please refer to [reference needed]. Figure 1 and Figure 2 The test apparatus 1 shown here for testing several microphones 2a–2i is generally as follows: Figure 1 and / or Figure 2The testing apparatus is multiplied. Accordingly, the testing apparatus 1 has several receiving areas 7, of which only three receiving areas 7a–7c are shown here. According to this embodiment, for each microphone 2a–2i to be tested, at least one test speaker 3 is provided in the testing apparatus 1. As shown here, the testing apparatus 1 has one test speaker 3 for each microphone 2a–2i to be tested. As a supplement or alternative, it is also possible to... Figure 2 As shown in the figure, two or more test speakers 3 are assigned to several microphones 2a–2i to be tested.

[0088] Each microphone 2a–2i to be tested also corresponds to a reference microphone 8.

[0089] With the help of the test apparatus 1 shown here, several microphones 2 can be tested simultaneously.

[0090] The test apparatus 1 is configured such that the microphones 2a–2i to be tested are arranged side by side in a planar manner.

[0091] Figure 4 The test apparatus 1 for testing microphone 2 is shown. For simplicity, not all features are indicated by reference numerals here. Furthermore, features already described in one or more of the previous figures will not be repeated.

[0092] Compared to the previous figures, the diaphragm 10 in this embodiment is larger. This allows for the generation of higher sound pressure levels.

[0093] The at least one diaphragm 10 specifically has a surface 25 that is larger than the cross-section 24 of the passage 15 along the axial direction X. The surface 25 of the diaphragm 10 is parallel to the cross-section 24. Alternatively, the surface 25 of the diaphragm 10 may also be larger than the cross-section 24 of the first acquisition volume 16. Preferably, the surface 25 is a single-sided surface of the diaphragm 10, because only the surface 25 facing the corresponding volume or chamber functions in order to generate sound.

[0094] As a supplement or alternative, the surface 25 of the diaphragm 10 may also be larger than the cross section 24 of the second acquisition volume 18.

[0095] As a supplement or alternative, the surface 25 of the diaphragm 10 may also be larger than the cross section 24 of the front volume 14.

[0096] As a supplement or alternative, the surface 25 of the diaphragm 10 may also be larger than the cross section 24 of the rear volume 17.

[0097] As a supplement or alternative, the surface 25 of the diaphragm 10 may also be larger than the cross-section 24 of the test chamber 5.

[0098] As a supplement or alternative, the surface 25 of the diaphragm 10 may also be larger than the cross-section 24 of the reference cavity 13.

[0099] For clarity, only the cross-section 24 of passage 15 is shown here. Nevertheless, cross-sections 24 are also defined for other volumes / chambers 16, 18, 14, 17, 5, 13. The corresponding cross-sections 24 are specifically parallel to the surface 25 of diaphragm 10 or oriented parallel to diaphragm 10.

[0100] Taking channel 15 as an example, the advantage of this scheme is that the sound waves generated by the larger diaphragm 10 pass through the smaller cross-section channel 15 and thus reach the microphone 2 to be tested, thereby increasing the sound pressure.

[0101] In this embodiment, only one diaphragm 10 is shown. However, the test apparatus 1 may also have several diaphragms 10, such as several diaphragms of several test loudspeakers 3. Therefore, each diaphragm 10 has a surface 25 that is larger than the cross-section 24 of the front volume 14, the passage 15, the rear volume 17, the test cavity 5, the reference cavity 13, and the first and / or second acquisition volumes 16, 18 along the axial direction X. Alternatively, only at least one diaphragm 10 may have a surface 25 larger than the cross-section 24 of the front volume 14, the passage 15, the rear volume 17, the test cavity 5, the reference cavity 13, and the first and / or second acquisition volumes 16, 18.

[0102] Furthermore, according to this embodiment, the volume of the front volume 14 is greater than the volume of the passage 15 and / or the volume of the first acquisition volume 16. This results in an increase in the sound pressure level reaching the microphone 2.

[0103] Furthermore, according to this embodiment, the volume of the rear volume 17 is larger than the volume of the second acquisition volume 18. This also increases the sound pressure level.

[0104] Even if the test device 1 has several test speakers 1, the volume of the front volume 14 and / or the corresponding rear volume 17 can be greater than the volume of the passage 15, the first acquisition volume 16 or the second acquisition volume 18.

[0105] according to Figure 4 The passageway 15, the first and second acquisition volumes 16, 18 are arranged or oriented in a manner that is not concentric or coaxial with the front volume 14, the rear volume 17, the test loudspeaker 3, or the diaphragm 10. As shown here, the passageway 15, the first and second acquisition volumes 16, 18 are arranged in a manner that is offset relative to the front volume 14 and relative to the rear volume 17 along the transverse Y direction.

[0106] In an alternative embodiment, the passage 15, the first and / or second acquisition volumes 16, 18 may be arranged or oriented concentrically or coaxially with the front volume 14, the rear volume 17, the test speaker 3, and / or the diaphragm 10.

[0107] This invention is not limited to the embodiments shown and described. Variations within the scope of the claims may be employed, and features may be combined, even if these features are disclosed and described in different embodiments.

[0108] Appendix Label Table

[0109] 1. Test apparatus

[0110] 2 microphones

[0111] 3. Test the speaker

[0112] 4 Test tone

[0113] 5 Test Chamber

[0114] 6 First side

[0115] 7. Accommodation Area

[0116] 8. Reference Microphone

[0117] 9 Second side

[0118] 10 membranes

[0119] 11 First Test Sound Section

[0120] 12 Second Test Tone Section

[0121] 13 Reference cavity

[0122] 14. Front volume

[0123] 15 access

[0124] 16 First Acquisition Volume

[0125] 17 Rear Volume

[0126] 18 Second Acquisition Volume

[0127] 19. Containing device

[0128] 20 Notch

[0129] 21. Shell

[0130] 22 Top side

[0131] 23 Bottom side

[0132] 24 Cross-section

[0133] 25 sides

[0134] H lifting shaft

[0135] X-axis

[0136] Y (horizontal)

Claims

1. A testing device for testing microphones (1) It has at least one test speaker (3) for generating at least one test tone (4). It has at least one test cavity (5), into which the test tone (4) is sent. It has at least one receiving area (7) for accommodating a microphone (2) to be tested, which is configured to acoustically couple the microphone (2) to be tested with the test cavity (5), and It has at least one reference microphone (8) for measuring the reference signal of the test tone (4) emitted by the test speaker (3). Its features are, The test apparatus (1) has a reference cavity (13) separated from the test cavity (5), the test tone (4) is sent into the reference cavity, and the reference cavity is acoustically coupled to the reference microphone (8) used to measure the reference signal, and / or The accommodating area (7) is arranged on the first side (6) of the test speaker (3), and the reference microphone (8) is arranged on the second side (9) of the test speaker (3) opposite to the first side (6). The test loudspeaker (3) includes a diaphragm (10) for transmitting the test sound (4) to the test cavity (5) and / or the reference cavity (13), wherein the projected area of ​​the surface (25) of the diaphragm (10) is greater than the area of ​​the cross section (24) of the test cavity (5).

2. The testing apparatus according to claim 1, characterized in that, The test loudspeaker (3) is constructed and / or arranged to emit the test tone (4) toward the first side (6) and / or toward the test cavity (5), and toward the second side (9) and / or toward the reference cavity (13), and / or, The reference cavity (13) is arranged on the second side (9) of the test loudspeaker (3).

3. The testing apparatus according to any one or more of the preceding claims, characterized in that... , The diaphragm (10) is disposed between the test chamber (5) and the reference chamber (13), and / or, The diaphragm (10) separates the test chamber (5) from the reference chamber (13).

4. The testing apparatus according to claim 1, characterized in that... The test device (1) has a receiving device (19) for receiving the microphone (2) to be tested on the first side (6) of the test speaker (3), the receiving device having a receiving area (7), wherein the receiving device (19) and / or the test device (1) have a fixing device for fixing the microphone (2) to be tested in a press-fit and / or form fit manner.

5. The testing apparatus according to claim 4, characterized in that... The test cavity (5) is at least partially composed of the front volume (14) of the test speaker (3), the passage (15) of the accommodating device (19) and / or the accommodating area (7), and / or the first acquisition volume (16) of the microphone (2) to be tested.

6. The testing apparatus according to claim 5, characterized in that... The reference cavity (13) is at least partially composed of the rear volume (17) of the test loudspeaker (3) and / or the second acquisition volume (18) of the reference microphone (8).

7. The testing apparatus according to claim 1, characterized in that... The test cavity (5) and the reference cavity (13) are spaced apart by a certain distance along the axial (X) direction of the test device (1), and / or, The at least one test loudspeaker (3) is arranged between the test cavity (5) and the reference cavity (13).

8. The testing apparatus according to claim 6, characterized in that... The front volume (14), the accommodating device (19) and / or the passage (15) of the accommodating region (7) and / or the first acquisition volume (16) are arranged coaxially and equally with each other, and / or The rear volume (17) and the second acquisition volume (18) are arranged coaxially and equally, and / or The front volume (14), the passage (15), the rear volume (17), and the first and / or second acquisition volumes (16, 18) have circular cross-sections.

9. The testing apparatus according to claim 6, characterized in that... The diaphragm (10) of the at least one test loudspeaker (3) is arranged in a transverse (Y) orientation, and / or The surface (25) of the diaphragm (10) is larger than the cross-section of the front volume (14), the passage (15), the rear volume (17), the reference cavity (13), and the first and / or second acquisition volumes (16, 18) along the axial direction (X).

10. The testing apparatus according to claim 6, characterized in that... The volume of the front volume (14) is greater than the volume of the passage (15) and / or the volume of the first acquisition volume (16), and / or The volume of the rear volume (17) is greater than the volume of the second acquisition volume (18).

11. The testing apparatus according to claim 1, characterized in that... At least two test loudspeakers (3) are arranged overlappingly along the axial (X) direction of the test device (1), and / or, with regard to the two overlapping test loudspeakers (3), the rear volume (17) of one test loudspeaker (3) is arranged coaxially and equally with the front volume (14) of the other test loudspeaker (3).

12. The testing apparatus according to claim 4, characterized in that... The at least one test speaker (3), the at least one reference microphone (8) and / or the housing (19) are arranged in the housing (21).

13. The testing apparatus according to claim 1, characterized in that... The testing device (1) can be used to test several microphones (2) to be tested, and / or several microphones (2) to be tested can be housed in the housing area (7), wherein the housing area (7) is arranged in a planar manner side by side for testing several microphones (2) to be tested.

14. The testing apparatus according to claim 1, characterized in that... In order to test several microphones (2) to be tested, the test device (1) has several accommodating areas (7), several test speakers (3), several test cavities (5), several reference microphones (8) and / or several reference cavities (13).

15. The testing apparatus according to claim 1, characterized in that... The microphone to be tested (2) is a MEMS microphone, and / or The at least one test loudspeaker (3) is a MEMS loudspeaker and / or an electrodynamic loudspeaker, and / or The at least one reference microphone (8) is a MEMS microphone, an electrostatic microphone, and / or a condenser microphone.

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