CN216291445U - Microphone testing device - Google Patents
Microphone testing device Download PDFInfo
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- CN216291445U CN216291445U CN202122407902.5U CN202122407902U CN216291445U CN 216291445 U CN216291445 U CN 216291445U CN 202122407902 U CN202122407902 U CN 202122407902U CN 216291445 U CN216291445 U CN 216291445U
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Abstract
The utility model discloses a microphone testing device. The microphone testing device comprises a loudspeaker and a testing device, wherein the loudspeaker is used for generating sound signals; the microphone to be tested is adjacent to the loudspeaker and generates an electric signal according to the sound signal; the audio signal acquisition card is connected with the loudspeaker to provide a driving signal and is connected with the microphone to be tested to obtain the electric signal; and the upper computer is connected with the audio signal acquisition card and analyzes the electric signal to obtain the audio parameter of the microphone to be tested, wherein the audio signal acquisition card provides a driving signal with variable amplitude to realize sound pressure sweeping test, and the audio parameter of the microphone to be tested is a parameter related to the sound pressure range. The microphone testing device can realize the sound pressure sweeping test of the microphone to be tested, and the testing efficiency of the microphone to be tested is improved.
Description
Technical Field
The utility model relates to the technical field of testing, in particular to a microphone testing device.
Background
The microphone is used for converting a sound signal into an electric signal. With the progress of science and technology, microphones have been popularized in a global range, and the application range of the microphones relates to the fields of mobile phones, computers, earphone sets, automotive electronics, medical digital cameras, wearable intelligent equipment, unmanned driving, internet of things, smart home and the like.
Acoustic Overload Points (AOPs) are an important performance indicator for microphones. The Acoustic Overload Point (AOP) is the corresponding sound pressure when the Total Harmonic Distortion (THD) of the microphone reaches 10%. The higher the Acoustic Overload Point (AOP) of the microphone, the better the performance at high sound pressure, which is beneficial for the microphone to keep low distortion in a wide sound pressure range and improve the elimination of noise and echo. Speech recognition technology has been widely applied to smart devices, and if the Acoustic Overload Point (AOP) of a microphone is increased, the quality of an audio signal can be improved in a noisy environment, thereby increasing the recognition accuracy of a speech recognition system. Therefore, accurate and efficient testing of the Acoustic Overload Point (AOP) of the microphone is required during the shipping and application processes.
However, in the prior art, all systems for testing Acoustic Overload Points (AOPs) of microphones are single sound pressure point tests, which are low in testing efficiency and easily cause waste of manpower in the testing process.
SUMMERY OF THE UTILITY MODEL
In view of the foregoing problems, an object of the present invention is to provide a microphone testing apparatus, which performs an automatic test of sweeping sound pressure to obtain data of an acoustic overload point of a microphone to be tested, so as to improve testing efficiency of the acoustic overload point of the microphone to be tested.
According to an aspect of the present invention, there is provided a microphone testing apparatus, comprising: a speaker for generating an acoustic signal; the microphone to be tested is adjacent to the loudspeaker and generates an electric signal according to the sound signal; the audio signal acquisition card is connected with the loudspeaker to provide a driving signal and is connected with the microphone to be tested to obtain the electric signal; and the upper computer is connected with the audio signal acquisition card and analyzes the electric signal to obtain the audio parameter of the microphone to be tested, wherein the audio signal acquisition card provides a driving signal with variable amplitude to realize sound pressure sweeping test, and the audio parameter of the microphone to be tested is a parameter related to the sound pressure range.
Preferably, the method further comprises the following steps: and the driving module is connected with the microphone to be tested to provide working voltage.
Preferably, the audio signal acquisition card is connected with the loudspeaker and the microphone to be detected through wires.
Preferably, the method further comprises the following steps: the sound insulation box, loudspeaker the microphone that awaits measuring drive module arranges in the sound insulation box is inside, the host computer with audio signal gathers the card and arranges in the sound insulation box is outside.
Preferably, soundproof cotton is paved on the inner wall of the soundproof box.
Preferably, a wire guide hole is formed in a side surface of the soundproof box, and the wire enters the inside of the soundproof box from the outside of the soundproof box through the wire guide hole.
Preferably, the wire guide hole is sealed with soundproof cotton.
Preferably, the method further comprises the following steps: and the jig is positioned in the sound insulation box and fixes the microphone to be tested at a position adjacent to the loudspeaker.
Preferably, the input voltage range of the audio signal acquisition card is larger than the electric signal amplitude range of the microphone to be detected.
Preferably, the output voltage range of the audio signal acquisition card corresponds to the sound pressure range of the loudspeaker in the test.
Preferably, the method further comprises the following steps: and the power amplifier module is positioned in the sound insulation box and connected between the audio signal acquisition card and the loudspeaker.
Preferably, the method further comprises the following steps: and the reference microphone is positioned in the sound insulation box, is adjacent to the microphone to be detected and is used for detecting the sound pressure of the loudspeaker.
Preferably, the acoustic overload point of the reference microphone is higher than the acoustic overload point of the microphone to be tested.
Preferably, the audio parameter comprises at least one of a sensitivity of the microphone, a total harmonic distortion and an acoustic overload point.
According to the microphone testing device, the audio signal acquisition card provides the driving signal with the amplitude variation, so that the loudspeaker generates the sound signal varying in the preset sound pressure range, and the audio parameter of the microphone to be tested in the preset sound pressure range can be obtained. Compared with the prior art, the microphone testing device can realize the automatic test of sweeping sound pressure and record test data, does not need single sound pressure point test, and improves the testing efficiency.
In a preferred embodiment, the loudspeaker, the microphone to be tested and the driving module are arranged inside the sound insulation box, and the upper computer and the audio signal acquisition card are arranged outside the sound insulation box, so that the sound pressure range of the sound signal generated by the loudspeaker corresponds to the output voltage range of the audio signal acquisition card, and the test accuracy is further improved.
In a preferred embodiment, the power amplifier module is also placed inside the sound-proof box. The power amplification module can amplify the output voltage of the audio signal acquisition card so as to achieve a voltage range corresponding to the sound pressure range of the loudspeaker in the test. Due to the adoption of the power amplification module, the audio signal acquisition card can be suitable for various types of microphones to be tested.
In a preferred embodiment, the reference microphone is placed inside the sound-proof box. The reference microphone is used for detecting the sound pressure of the loudspeaker, and the audio parameters are obtained based on the sound pressure detected by the reference microphone and the electric signals of the microphone to be tested, so that the influence of the distortion of the loudspeaker on the audio parameters of the microphone to be tested is reduced, and the testing accuracy is further improved.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:
fig. 1 shows a schematic block diagram of a microphone testing device according to a first embodiment of the present invention.
Fig. 2 shows a schematic block diagram of a microphone testing device according to a second embodiment of the utility model.
Fig. 3 shows a schematic block diagram of a microphone testing device according to a third embodiment of the utility model.
Detailed Description
Various embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. In the various figures, the same elements or modules are denoted by the same or similar reference numerals. For purposes of clarity, the various features in the drawings are not necessarily drawn to scale.
It should be understood that in the following description, "circuitry" may comprise singly or in combination hardware circuitry, programmable circuitry, state machine circuitry, and/or elements capable of storing instructions executed by programmable circuitry. When an element or circuit is referred to as being "connected to" another element or circuit is referred to as being "connected between" two nodes, it may be directly coupled or connected to the other element or intervening elements may be present, and the connection between the elements may be physical, logical, or a combination thereof. In contrast, when an element is referred to as being "directly coupled" or "directly connected" to another element, it is intended that there are no intervening elements present.
Also, certain terms are used throughout the description and claims to refer to particular components. As one of ordinary skill in the art will appreciate, manufacturers may refer to a component by different names. This patent specification and claims do not intend to distinguish between components that differ in name but not function.
Moreover, it is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Fig. 1 shows a schematic block diagram of a microphone testing device provided by an embodiment of the present invention;
referring to fig. 1, a microphone testing apparatus 100 includes: speaker 112, microphone 113, drive module 114, host computer 130, audio signal acquisition card 120, sound insulation box 111.
Inside the soundproof case 111, a speaker 112, a microphone to be tested 113, and a drive module 114 are provided. An upper computer 130 and an audio signal acquisition card 120 are arranged outside the sound insulation box 111. The driving module 114 is connected to the microphone 113 to provide an operating voltage. Furthermore, a wire hole is opened on the side surface of the sound insulation box 111, and a wire enters the sound insulation box 111 from the outside of the sound insulation box 111 through the wire hole, so that the audio signal acquisition card 120 is connected with the microphone 113 and the speaker 112 through the wire. The wire guides may be sealed with acoustic wool. The sound isolation box 111 forms a closed space for accommodating the speaker 112 and the microphone 113, and forms a substantially constant acoustic environment, and suppresses the interference of environmental noise with the test result, so that the output voltage range of the audio signal acquisition card corresponds to the sound pressure range of the sound signal generated by the speaker 112.
Preferably, a jig is provided inside the soundproof case 111 for fixing the microphone 113 at a position adjacent to the speaker 112. With the jig fixed, the distance between the microphone 113 and the speaker 112 is maintained at a constant value, so that the test data of the microphone 113 is not affected by the distance variation. Soundproof cotton is laid on the inner wall of the soundproof box 111, and the influence of the self-distortion of the loudspeaker on the audio parameters of the microphone to be tested can be reduced by utilizing the soundproof cotton.
The audio signal collecting card 120 includes an input port and an output port, and is connected to the speaker 112 via the output port to provide a driving signal required for generating a sound signal, and is connected to the microphone 113 via the input port to collect an electrical signal generated by the microphone 113. The audio signal acquisition card 120 includes a digital-to-analog conversion function for converting the received discrete time domain test signal into a continuous time domain drive signal, and an analog-to-digital conversion function for converting the acquired continuous time domain electrical signal into discrete time domain test data. The audio signal acquisition card 120 uploads the test data to the host computer 130.
The upper computer 130 is, for example, a Personal Computer (PC) or a dedicated computing device on which software is installed. The host computer 130 is connected to the audio signal acquisition card 120, and sends test signals to the audio signal acquisition card 120 and receives test data from the audio signal acquisition card 120. Further, the upper computer 130 analyzes the test data to obtain the audio parameters of the microphone 113. The audio parameter is a parameter related to a sound pressure range, for example comprising at least one of a sensitivity of the microphone, a total harmonic distortion and an acoustic overload point.
The Total Harmonic Distortion (THD) of the microphone increases with the increase of the external sound pressure, and the external sound pressure corresponding to 10% of the total harmonic distortion is called an Acoustic Overload Point (AOP) of the microphone. In order to obtain the true audio distortion of the microphone 113 as accurately as possible, the order of the highest harmonics, e.g. 2, 3, 4 harmonics, may be determined according to the calculation power. To obtain the Acoustic Overload Point (AOP), the Total Harmonic Distortion (THD) of the microphone under a continuously varying sound pressure is measured.
Under the control of the test signal provided by the upper computer 130, the audio signal acquisition card 120 provides a driving signal with a variable amplitude, and the loudspeaker 112 generates a sound signal with a correspondingly variable sound pressure, so as to realize a sound sweeping pressure test. The test data provided by audio signal acquisition card 120 to host computer 130 is used to calculate the Total Harmonic Distortion (THD) of microphone 113. The output voltage range (i.e. the amplitude range of the driving signal) of the audio signal acquisition card 120 corresponds to the sound pressure range of the speaker 112 under test, and the input voltage range (i.e. the amplitude range of the sampling signal) is larger than the electrical signal amplitude range of the microphone 113.
In this embodiment, the upper computer 130 may control the audio signal acquisition card 120 to send out an audio signal with a variable amplitude, so that the speaker 112 generates a sound signal varying within a predetermined sound pressure range, and thus, an audio parameter of the microphone 113 within the predetermined sound pressure range may be obtained. Compared with the prior art, the microphone testing device 100 can realize sweeping sound pressure testing and record data sets, single sound pressure point testing is not needed, testing efficiency is improved, and labor cost is saved. The loudspeaker 112, the microphone 113 and the driving module 114 are arranged inside the sound insulation box 111, and the upper computer 130 and the audio signal acquisition card 120 are arranged outside the sound insulation box 111, so that the sound pressure range of the sound signal generated by the loudspeaker 112 corresponds to the output voltage range of the audio signal acquisition card 120, the influence of the distortion of the loudspeaker 112 on the audio parameter of the microphone 113 is reduced, and the test accuracy is further improved.
Fig. 2 shows a schematic block diagram of a microphone testing device according to a second embodiment of the utility model.
The microphone testing device 200 according to the second embodiment of the present invention has substantially the same structure as the microphone testing device 100 according to the first embodiment of the present invention, and only the differences therebetween will be described below.
The microphone test apparatus 200 includes a power amplifier module 115 provided inside the soundproof case 111. The power amplifier module 115 is connected between the audio signal acquisition card 120 and the speaker 112. The power amplifier module 115, for example, includes a power amplifier, the audio signal acquisition card 120 inputs the voltage signal into the power amplifier module 115, the power amplifier of the power amplifier module 115 amplifies the received voltage signal, and the amplified voltage signal is output to the speaker 112, so that the speaker 112 emits a corresponding sound signal.
In this embodiment, the power amplifier module 115 may amplify the output voltage of the audio signal acquisition card 120 to reach a voltage range corresponding to the sound pressure range of the speaker 112 under test. The sound pressure range of the sound signal generated by the speaker 112 corresponds to the output voltage range of the audio signal acquisition card 120. Due to the adoption of the power amplifier module 115, even if the output voltage of the audio signal acquisition card 120 is smaller, the sound pressure range of the sound signal generated by the loudspeaker 112 can be driven to reach the acoustic overload point of the microphone 113 to be tested. Therefore, audio signal acquisition card 120 may be adapted for use with various types of microphones 113.
Fig. 3 shows a schematic block diagram of a microphone testing device according to a third embodiment of the utility model.
The microphone testing device 300 according to the third embodiment of the present invention has substantially the same structure as the microphone testing device 100 according to the first embodiment of the present invention, and only the differences therebetween will be described below.
The microphone testing apparatus 300 includes a power amplifier module 115 and a reference microphone 116 provided inside a soundproof case 111. The power amplifier module 115 is connected between the audio signal acquisition card 120 and the speaker 112. The power amplifier module 115 includes, for example, a power amplifier. The audio signal collecting card 120 inputs the voltage signal into the power amplifier module 115, amplifies the received voltage signal by the power amplifier of the power amplifier module 115, and outputs the amplified voltage signal to the speaker 112, so that the speaker 112 emits a corresponding sound signal. The reference microphone 116 is adjacent to the microphone 113 to be tested, and is connected to the input ports of the audio signal acquisition card 120 respectively. The electrical signal of the reference microphone 116 is used to characterize the sound pressure of the horn 112. The acoustic overload point of the reference microphone 116 is higher than the acoustic overload point of the microphone under test 113, and a sound pressure corresponding to the acoustic overload point can be detected during the sweep pressure test.
The upper computer 130 obtains a variation curve of Total Harmonic Distortion (THD) along with external sound pressure based on the sound pressure detected by the reference microphone 116 and the electric signal of the microphone 113 to be detected, and further calculates an acoustic overload point of the microphone 113 to be detected.
In this embodiment, the power amplifier module 115 may amplify the output voltage of the audio signal acquisition card 120 to reach a voltage range corresponding to the sound pressure range of the speaker 112 under test. The sound pressure range of the sound signal generated by the speaker 112 corresponds to the output voltage range of the audio signal acquisition card 120. Due to the adoption of the power amplifier module 115, even if the output voltage of the audio signal acquisition card 120 is smaller, the sound pressure range of the sound signal generated by the loudspeaker 112 can be driven to reach the acoustic overload point of the microphone 113 to be tested. Therefore, audio signal acquisition card 120 may be adapted for use with various types of microphones 113. The reference microphone 116 is used to detect the sound pressure of the horn 112. The audio parameter is obtained based on the sound pressure detected by the reference microphone 116 and the electrical signal of the microphone 113 to be tested, so that the influence of the distortion of the loudspeaker 112 on the audio parameter of the microphone to be tested can be reduced, and the test accuracy is further improved.
In accordance with the present invention, as described above, these embodiments do not set forth all of the details or limit the utility model to only the specific embodiments described. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the utility model and the practical application, to thereby enable others skilled in the art to best utilize the utility model and various embodiments with various modifications as are suited to the particular use contemplated. The scope of the utility model should be determined with reference to the appended claims and their equivalents.
Claims (13)
1. A microphone testing device, comprising:
a speaker for generating an acoustic signal;
the microphone to be tested is adjacent to the loudspeaker and generates an electric signal according to the sound signal;
the audio signal acquisition card is connected with the loudspeaker to provide a driving signal and is connected with the microphone to be tested to obtain the electric signal; and
the upper computer is connected with the audio signal acquisition card and is used for analyzing the electric signals to obtain the audio parameters of the microphone to be detected,
the audio signal acquisition card provides a driving signal with variable amplitude to realize sound pressure sweeping test, and the audio parameter of the microphone to be tested is a parameter related to the sound pressure range.
2. The microphone testing device according to claim 1, further comprising:
and the driving module is connected with the microphone to be tested to provide working voltage.
3. The microphone testing device according to claim 2, wherein the audio signal collecting card is connected to the speaker and the microphone to be tested through wires.
4. The microphone testing device according to claim 3, further comprising:
the sound insulation box, loudspeaker the microphone that awaits measuring drive module arranges in the sound insulation box is inside, the host computer with audio signal gathers the card and arranges in the sound insulation box is outside.
5. The microphone testing device as claimed in claim 4, wherein the soundproof cotton is laid on the inner wall of the soundproof box.
6. The microphone testing device as claimed in claim 4, wherein a wire guide hole is opened in a side surface of the soundproof case, and the wire enters the inside of the soundproof case from outside of the soundproof case through the wire guide hole.
7. The microphone testing device according to claim 6, wherein the wire guide hole is sealed with soundproof cotton.
8. The microphone testing device according to claim 4, further comprising:
and the jig is positioned in the sound insulation box and fixes the microphone to be tested at a position adjacent to the loudspeaker.
9. The microphone testing device of claim 1, wherein the input voltage range of the audio signal acquisition card is larger than the amplitude range of the electrical signal of the microphone to be tested.
10. The microphone testing device according to claim 1, wherein the output voltage range of the audio signal acquisition card corresponds to the sound pressure range of the loudspeaker under test.
11. The microphone testing device according to claim 4, further comprising:
and the power amplifier module is positioned in the sound insulation box and connected between the audio signal acquisition card and the loudspeaker.
12. The microphone testing device according to claim 4, further comprising:
and the reference microphone is positioned in the sound insulation box, is adjacent to the microphone to be detected and is used for detecting the sound pressure of the loudspeaker.
13. A microphone testing device according to claim 12, characterized in that the acoustic overload point of the reference microphone is higher than the acoustic overload point of the microphone under test.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122407902.5U CN216291445U (en) | 2021-09-30 | 2021-09-30 | Microphone testing device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122407902.5U CN216291445U (en) | 2021-09-30 | 2021-09-30 | Microphone testing device |
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| CN216291445U true CN216291445U (en) | 2022-04-12 |
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| CN202122407902.5U Active CN216291445U (en) | 2021-09-30 | 2021-09-30 | Microphone testing device |
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- 2021-09-30 CN CN202122407902.5U patent/CN216291445U/en active Active
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