Acoustic automatic test system

Abstract

The invention provides an acoustic automatic test system, which comprises an audio analyzer, a sound production device and a sound reception device, and is characterized in that the audio analyzer responds to a received test instruction and outputs a test signal; and outputting test data in response to the received electric signal, the sound production device plays a test audio in response to the received test signal; the radio device responds to the received test audio and outputs an electric signal; the system further comprises a PC terminal and a silencing box. The PC end is used for responding to the input control instruction, calling a pre-stored test instruction and sending the pre-stored test instruction to the audio analyzer; analyzing and processing the received test data to generate a corresponding test result; and the silencing box is used for providing a clean and noiseless experimental environment with accurate distance setting and accurate position so as to ensure that input and output of signals of the sound production device and the sound reception device are not interfered by the outside. The problems that in the prior art, when an electronic product with a loudspeaker or a microphone is subjected to acoustic testing, operation is tedious and low in efficiency, and result accuracy is poor are solved.

Description

Technical Field

[0001] This invention relates to the field of acoustic testing technology, and more particularly to an automated acoustic testing system. Background Technology

[0002] With the continuous enrichment of smart home scenarios and the rapid development of technology, many smart products such as speakers and cameras are widely used in public places, offices, and homes. In particular, products that output sound through speakers and record sound through microphones directly affect the user experience in terms of audio quality, voice interaction, and intelligent control. To ensure that the acoustic performance of products meets standards, it is crucial to conduct accurate and efficient acoustic testing of speakers or microphones during the production process.

[0003] However, traditional acoustic testing methods have revealed many insurmountable limitations when dealing with current testing needs, specifically: (1) Cumbersome and inefficient operation: Traditional acoustic testing relies on manually inputting test commands. After inputting the commands, it is necessary to carefully coordinate each step according to the time difference before the audio analyzer can be run to carry out the test. The whole process involves too much human intervention, and the operation process is complicated and time-consuming. In addition, during the test, in order to meet specific test conditions, it is often necessary to repeatedly adjust the test position and angle, which not only increases the difficulty and uncertainty of operation, but also further prolongs the test time. (2) Poor accuracy of results: Due to the above-mentioned operational and conditional limitations, the uncertainty of the test results obtained by traditional methods has increased significantly, resulting in increased test repeatability. However, it is still difficult to quickly and accurately reflect the true acoustic performance of the DUT (Device Under Test), and cannot provide a reliable basis for product development and quality control. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides an automated acoustic testing system that solves the problems of cumbersome and inefficient operation and poor accuracy of results when testing electronic products with speakers or microphones.

[0005] According to an embodiment of the present invention, an automated acoustic testing system includes an audio analyzer, a sound-generating device, and a sound-receiving device. The audio analyzer outputs a test signal to the sound-generating device in response to a received test command; and outputs test data in response to a received electrical signal. The sound-generating device plays test audio in response to the received test signal; and the sound-receiving device outputs an electrical signal to the audio analyzer in response to the received test audio. It also includes a silencer and a PC. The PC terminal integrates a memory and a communication interface for communicating with the audio analyzer. It is used to respond to input control commands, call the test commands pre-stored in the memory, and send them to the audio analyzer; and to analyze and process the test data sent by the audio analyzer to generate corresponding test results. The silencing box, which houses the sound-generating device and the sound-receiving device, provides a clean, noise-free experimental environment with precise distance and location settings, ensuring that the input and output of the signals from the sound-generating device and the sound-receiving device are not affected by external interference.

[0006] Compared with the prior art, the present invention has the following beneficial effects: By inputting control commands to the PC, the PC can invoke pre-stored test commands and control the audio analyzer to perform acoustic tests on the device under test. The entire testing process can be automated by simply inputting control commands to the PC. Compared to traditional acoustic testing, it eliminates the need for multiple manual operations, making the operation simpler and the testing efficiency higher. Furthermore, the standardized testing program on the PC fixes the test position and angle, eliminating the need for repeated manual adjustments, thus shortening the testing time and improving the accuracy of the test results. By placing the sound-generating device and the sound-receiving device inside the anechoic chamber and adjusting the distance between them, the anechoic chamber provides a clean, noise-free, adjustable-distance, and precisely positioned experimental environment for the sound-generating device and the sound-receiving device. Compared to traditional acoustic testing, this method ensures that the input and output of the signals from the sound-generating device and the sound-receiving device are not affected by external interference while meeting testing requirements at different distances, thereby further improving the accuracy of the test results. Attached Figure Description

[0007] Figure 1 This is a control principle diagram of an automated acoustic testing system according to an embodiment of the present invention.

[0008] Figure 2 This is a control principle diagram of the microphone as the device under test in an embodiment of the present invention.

[0009] Figure 3 This is a control principle diagram of the speaker as the device under test in an embodiment of the present invention.

[0010] Figure 4 This is a control principle diagram of an automated acoustic testing system according to an embodiment of the present invention, which employs remote control via a mobile terminal.

[0011] In the above attached diagram: 1. Audio analyzer; 2. Sound-generating device; 3. Sound-receiving device; 4. PC terminal; 5. Silencer box; 6. Mobile terminal. Detailed Implementation

[0012] The technical solutions of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0013] like Figure 1 As shown in the figure, this embodiment of the invention proposes an automated acoustic testing system, comprising an audio analyzer 1, a sound-generating device 2, and a sound-receiving device 3. The audio analyzer 1, in response to a received test command, outputs a test signal to the sound-generating device 2; and in response to a received electrical signal, outputs test data. The sound-generating device 2, in response to the received test signal, plays test audio. The sound-receiving device 3, in response to the received test audio, outputs an electrical signal to the audio analyzer 1. It also includes a PC client 4 and a silencer box 5; The PC terminal 4 integrates a memory and a communication interface for communicating with the audio analyzer 1. It is used to respond to input control commands, call the corresponding test commands stored in the memory, and send them to the audio analyzer 1; and to analyze and process the test data sent by the audio analyzer 1 to generate corresponding test results. The silencing box 5 houses the sound-generating device 2 and the sound-receiving device 3, providing a clean, noise-free experimental environment with precise distance and location settings to ensure that the input and output of the signals from the sound-generating device 2 and the sound-receiving device 3 are not affected by external interference.

[0014] In this embodiment, the sound-generating device 2 and the sound-receiving device 3 are placed inside the silencer box 5. The PC terminal 4 is connected to the audio analyzer 1, the audio analyzer 1 to the sound-generating device 2, and the audio analyzer 1 to the sound-receiving device 3. The tester then operates the corresponding buttons on the PC terminal 4 to input control commands. Upon receiving the control commands, the PC terminal 4 retrieves the corresponding pre-stored test commands from the memory and sends them to the audio analyzer 1. The audio analyzer 1 then generates a corresponding test signal based on the test command and outputs the test signal to the sound-generating device 2. Upon receiving the test signal, the sound-generating device 2 plays... The corresponding test audio is played (the sound-generating device 2 converts the electrical signal into an acoustic signal). Then, the sound-receiving device 3 receives the test audio played by the sound-generating device 2 and generates a corresponding electrical signal based on the test audio (the sound-receiving device 3 converts the acoustic signal into an electrical signal). This signal is then output to the audio analyzer 1, which analyzes the received electrical signal to obtain the corresponding test data and outputs it to the PC terminal 4. After receiving the test data, the PC terminal 4 analyzes and processes the received test data to generate corresponding test results. This allows the tester to understand the acoustic performance of the device under test (DUT, the sound-generating device 2 or the sound-receiving device 3) by viewing the test results on the PC terminal 4.

[0015] As a preferred embodiment, such as Figure 2 As shown, when the sound receiving device 3 is a microphone and the microphone is the device under test, the sound generating device 2 is an artificial mouth. The artificial mouth is used to simulate the acoustic characteristics of a human mouth to ensure the standardization and repeatability of acoustic testing.

[0016] In this embodiment, the microphone acoustic test is performed as follows: The DUT (microphone) and the artificial mouth are placed inside the silencer box 5. The tester inputs control commands to the PC terminal 4. After receiving the control commands, the PC terminal 4 calls the corresponding test commands pre-stored in the memory and sends the test commands to the audio analyzer 1. The audio analyzer 1 generates the corresponding test signal according to the test commands and outputs the test signal to the artificial mouth. The artificial mouth can convert the received test signal into the corresponding test audio and output it. Then, the DUT receives the test audio from the artificial mouth, converts the received test audio into the corresponding electrical signal, and outputs it to the audio analyzer 1. The audio analyzer 1 can perform acoustic characteristic analysis on the received electrical signal to obtain the corresponding test data (the test data is the MIC parameters of the test DUT, such as frequency response, distortion, airtightness, signal-to-noise ratio, sensitivity, etc.) and outputs it to the PC terminal 4. After receiving the test data, the PC terminal 4 analyzes and processes the received test data to generate the corresponding test results.

[0017] As a preferred embodiment, such as Figure 3 As shown, when the sound-generating device 2 is a loudspeaker and the loudspeaker is the device under test, the sound-receiving device 3 is a standard microphone, which is used to collect, transmit and process the test audio.

[0018] In this embodiment, the loudspeaker acoustic test is performed as follows: The DUT (loudspeaker unit) and a standard microphone are placed inside the anechoic chamber 5. The tester inputs control commands to the PC terminal 4. Upon receiving the control commands, the PC terminal 4 retrieves the corresponding pre-stored test commands from the memory and sends them to the audio analyzer 1. The audio analyzer 1 then generates a corresponding test signal based on the test commands and outputs the test signal to the DUT. This allows the DUT to convert the received test signal into a corresponding test audio signal and output it. Subsequently, the standard microphone receives the test audio signal from the DUT, converts it into a corresponding electrical signal, and outputs it to the audio analyzer 1. The audio analyzer 1 then performs acoustic characteristic analysis on the received electrical signal to obtain corresponding test data (the test data consists of the DUT's speaker parameters, such as frequency response, distortion, sound pressure level, signal-to-noise ratio, sensitivity, etc.) and outputs it to the PC terminal 4. Upon receiving the test data, the PC terminal 4 analyzes and processes the received test data to generate corresponding test results.

[0019] In a preferred embodiment, an infrared ranging and positioning device is provided at the sound-emitting device 2. The infrared ranging and positioning device is used to accurately locate the position of the device under test by measuring distance and leveling with infrared rays.

[0020] In this embodiment, when the sound receiving device 3 is a microphone and the microphone is the device under test, the sound generating device 2 is an artificial mouth. A horizontal infrared ranging and positioning device is set at the end of the artificial mouth. The position of the microphone of the device under test is accurately located by the infrared ranging and leveling function of the horizontal infrared ranging and positioning device. When the sound generating device 2 is a loudspeaker and the loudspeaker is the device under test, the sound receiving device 3 is a standard microphone. A vertical infrared ranging and positioning device is set at the end of the loudspeaker. The position of the loudspeaker of the device under test is accurately located by the infrared ranging and leveling function of the vertical infrared ranging and positioning device, thereby eliminating the influence of the test position on the sound and improving the accuracy of the acoustic test.

[0021] In a preferred embodiment, the silencing box 5 is made of a multi-layer composite structure. The outer layer of the multi-layer composite structure is a metal plate layer, which is used to provide stable structural support. The middle layer of the multi-layer composite structure is a sound-absorbing layer, which is used to absorb the sound energy inside the silencing box 5. The inner layer of the multi-layer composite structure is an acoustic conditioning layer, which is used to further adjust the propagation characteristics of sound waves.

[0022] As a further preferred embodiment, the metal sheet layer is a stainless steel sheet or an aluminum alloy sheet; the sound-absorbing layer is a polyurethane foam or a melamine foam.

[0023] In this embodiment, the multi-layer composite structure has at least three layers. The outer layer is a metal sheet layer (including but not limited to stainless steel or aluminum alloy, preferably 304 stainless steel with a thickness ≥1.2mm or 6061 aluminum alloy with a thickness ≥1.5mm), which effectively blocks the propagation of sound waves through its high density characteristics while ensuring stable structural support. The middle layer is a sound-absorbing layer (including but not limited to polyurethane foam or melamine foam, preferably polyurethane foam or melamine foam with a thickness of 50-300mm), which generates a viscous effect through its porous structure, converting sound energy into heat energy and absorbing sound waves. The inner layer is an acoustic conditioning layer (including but not limited to an acoustic coating containing microparticles, preferably an acoustic coating with a thickness of 0.5-2mm), which adjusts the propagation characteristics of sound waves through the reflection effect of the microparticle surface, further absorbing sound waves. By employing a multi-layered composite structure to fabricate the silencing box 5, it achieves excellent noise reduction, providing a clean, noise-free, distance-adjustable, and position-precise experimental environment for the sound-generating device 2 and the sound-receiving device 3. Compared to traditional acoustic testing, this ensures that the input and output of the signals from the sound-generating device 2 and the sound-receiving device 3 are not affected by external interference, further improving the accuracy of the test results.

[0024] In a preferred embodiment, the silencer box 5 includes a shell and a cover, the cover being detachably mounted on the shell to open the internal space of the shell and place the sound-generating device 2 and the sound-receiving device 3.

[0025] In this embodiment, the cover is detachably mounted on the housing, including but not limited to being detached from the housing by fixing bolts. By mounting the cover on the housing, the housing and the cover can form a sealed sound-absorbing space, providing a clean and noise-free experimental environment for the sound-generating device 2 and the sound-receiving device 3. By removing the cover from the housing, the internal space of the housing is opened, so as to facilitate the replacement of the device under test (DUT) placed inside the housing, and to realize acoustic testing of different devices under test (DUT).

[0026] In a preferred embodiment, a guide rail moving platform is provided inside the housing. The sound-generating device 2 or the sound-receiving device 3 is placed on the guide rail moving platform, and the sound-generating device 2 or the sound-receiving device 3 is moved by the guide rail moving platform to adjust the distance between the sound-generating device 2 and the sound-receiving device 3.

[0027] In this embodiment, the guide rail moving platform includes a guide rail and a platform. The platform can move back and forth and left and right on the guide rail. The sound-emitting device 2 or the sound-receiving device 3 is placed on the platform, and the sound-receiving device 3 or the sound-emitting device 2 corresponding to the sound-emitting device 2 or the sound-receiving device 3 is placed inside the housing. This allows the back and forth and left and right movement of the platform to drive the sound-emitting device 2 or the sound-receiving device 3 to move back and forth and left and right, thereby adjusting the distance between the sound-emitting device 2 and the sound-receiving device 3 to meet the testing requirements of different distances between the sound-emitting device 2 and the sound-receiving device 3.

[0028] As a preferred embodiment, such as Figure 4 As shown, the acoustic automated testing system further includes a mobile terminal 6, which is communicatively connected to the PC terminal 4 and is used to receive input control commands and remotely forward them to the PC terminal 4.

[0029] In this embodiment, the PC terminal 4 includes, but is not limited to, desktop computers and laptops, and the mobile terminal 6 includes, but is not limited to, mobile phones and tablets. During acoustic testing, the user can hold the mobile terminal 6 and input control commands into the mobile terminal 6, so that the mobile terminal 6 will remotely transmit the control commands to the PC terminal 4, allowing the PC terminal 4 to call the corresponding test commands pre-stored in the memory according to the received control commands, and control the audio analyzer 1 through the test commands.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. An automated acoustic testing system, comprising an audio analyzer, a sound-generating device, and a sound-receiving device, wherein the audio analyzer, in response to a received test command, outputs a test signal to the sound-generating device; And in response to the received electrical signal, output test data; The sound-generating device responds to the received test signal by playing test audio; the sound-receiving device responds to the received test audio by outputting an electrical signal to the audio analyzer. Its features include: a PC terminal and a silencer box; The PC terminal integrates a memory and a communication interface for communicating with the audio analyzer, and is used to respond to input control commands, call the test commands pre-stored in the memory, and send them to the audio analyzer. And analyze and process the test data sent by the received audio analyzer to generate corresponding test results; The silencing box, which houses the sound-generating device and the sound-receiving device, provides a clean, noise-free experimental environment with precise distance and location settings, ensuring that the input and output of the signals from the sound-generating device and the sound-receiving device are not affected by external interference.

2. The acoustic automated testing system as described in claim 1, characterized in that: When the sound receiving device is a microphone and the microphone is the device under test, the sound generating device is an artificial mouth. The artificial mouth is used to simulate the acoustic characteristics of a human mouth to ensure the standardization and repeatability of acoustic testing.

3. The acoustic automated testing system as described in claim 1, characterized in that: When the sound-generating device is a loudspeaker and the loudspeaker is the device under test, the sound-receiving device is a standard microphone, which is used to collect, transmit and process the test audio.

4. An automated acoustic testing system as described in claim 2 or 3, characterized in that: An infrared ranging and positioning device is provided at the sound-emitting device. The infrared ranging and positioning device is used to accurately locate the position of the device under test by measuring distance and leveling with infrared rays.

5. The acoustic automated testing system as described in claim 1, characterized in that: The silencing box is made of a multi-layer composite structure. The outer layer of the multi-layer composite structure is a metal plate layer, which is used to provide stable structural support. The middle layer of the multi-layer composite structure is a sound-absorbing layer, which is used to absorb the sound energy in the silencing box. The inner layer of the multi-layer composite structure is an acoustic conditioning layer, which is used to further adjust the propagation characteristics of sound waves.

6. The acoustic automated testing system as described in claim 5, characterized in that: The metal sheet layer is a stainless steel sheet or an aluminum alloy sheet.

7. The acoustic automated testing system as described in claim 5, characterized in that: The sound-absorbing layer is made of polyurethane foam or melamine foam.

8. The acoustic automated testing system as described in claim 1, characterized in that: The silencer box includes a shell and a cover. The cover is detachably mounted on the shell to open the internal space of the shell and place the sound-generating device and the sound-receiving device.

9. The acoustic automated testing system as described in claim 8, characterized in that: The housing is equipped with a guide rail moving platform. The sound-generating device or the sound-receiving device is placed on the guide rail moving platform. The guide rail moving platform drives the sound-generating device or the sound-receiving device to move, so as to adjust the distance between the sound-generating device and the sound-receiving device.

10. The acoustic automated testing system as described in claim 1, characterized in that: It also includes a mobile terminal, which is communicatively connected to the PC terminal to receive input control commands and remotely forward them to the PC terminal.

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