CN110858950A - Sound equipment testing method, sound equipment testing equipment and sound equipment - Google Patents
Sound equipment testing method, sound equipment testing equipment and sound equipment Download PDFInfo
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- CN110858950A CN110858950A CN201810968411.8A CN201810968411A CN110858950A CN 110858950 A CN110858950 A CN 110858950A CN 201810968411 A CN201810968411 A CN 201810968411A CN 110858950 A CN110858950 A CN 110858950A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R29/00—Monitoring arrangements; Testing arrangements
- H04R29/001—Monitoring arrangements; Testing arrangements for loudspeakers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R29/00—Monitoring arrangements; Testing arrangements
- H04R29/004—Monitoring arrangements; Testing arrangements for microphones
Abstract
The invention provides a sound equipment testing method, sound testing equipment and sound equipment, wherein the sound equipment comprises the following components: the system comprises a master control system, a sound system and a pickup array, wherein the pickup array comprises a microphone; the method comprises the following steps: outputting a frequency sweeping signal to the sound system through the master control system; the sound system converts the received sweep frequency signal into an acoustic signal and plays the acoustic signal; collecting sound signals played by the sound system through the microphone, converting the collected sound signals into electric signals, and outputting the electric signals to the master control system; and the master control system receives the electric signal sent by the microphone, compares the sweep frequency signal with the electric signal and determines an electroacoustic index. The obtained index is the result of the combined action of the sound system and the microphone, the test of the two parts is completed at one time, no additional equipment investment is needed in the whole process, the detection cost is reduced, the process is simple, and the efficiency is high.
Description
Technical Field
The invention relates to the technical field of sound signal processing, in particular to a sound equipment testing method, sound equipment and sound testing equipment.
Background
With the development of information technology, products such as intelligent sound boxes are produced and show a more and more popular trend.
In the prior art, in the production process of intelligent sound box products, indexes of a sound pickup array (sensitivity, phase consistency and the like of a microphone) and indexes of a loudspeaker (frequency response, distortion and the like) are generally detected independently by different devices.
As shown in the microphone test diagram of fig. 1, the microphone test process is as follows: and the computer controls the sound card to send out a 20-20 KHz sweep frequency electric signal, and the sweep frequency electric signal is converted into a sound signal by the artificial mouth. The microphone to be tested converts the received sound signal into an electric signal, the electric signal is amplified by the measuring amplifier and then transmitted to the sound card, and the sound card converts the electric signal into a digital signal and transmits the digital signal to the computer. The computer can calculate the sensitivity, frequency response and other indexes of the microphone to be measured according to the signals sent and received by the computer.
As shown in the loudspeaker test diagram of fig. 2, the sound system test procedure is as follows: and the computer controls the sound card to send out a 20-20 KHz sweep frequency electric signal, and the signal is amplified by the sound system to be tested and converted into an acoustic signal. The simulated ear converts the sound signal sent by the sound system to be measured into an electric signal, the electric signal is amplified by the measuring amplifier and then transmitted to the sound card, and the sound card converts the electric signal into a digital signal and transmits the digital signal to the computer. The computer can calculate the indexes of frequency response, distortion and the like of the acoustic system to be tested according to the signals sent out and received by the computer.
The microphone and the loudspeaker are tested independently by adopting different devices, the process is complex, and the efficiency is low.
Disclosure of Invention
The invention provides a sound equipment testing method, corresponding sound equipment and sound testing equipment, and aims to solve the problems that different equipment is adopted for testing a microphone and a sound system independently, the process is complex, and the efficiency is low.
In order to solve the above problems, the present invention discloses a sound equipment testing method, the sound equipment including: the system comprises a master control system, a sound system and a pickup array, wherein the pickup array comprises a microphone;
the method comprises the following steps:
outputting a frequency sweeping signal to the sound system through the master control system;
the sound system converts the received sweep frequency signal into an acoustic signal and plays the acoustic signal;
collecting sound signals played by the sound system through the microphone, converting the collected sound signals into electric signals, and outputting the electric signals to the master control system;
and the master control system receives the electric signal sent by the microphone, compares the sweep frequency signal with the electric signal and determines an electroacoustic index.
Optionally, the pickup array further comprises a digital signal processing unit, and the method further comprises:
setting the digital signal processing unit to an off state after the microphone converts the acoustic signal to an electrical signal.
Optionally, the head of the sweep signal includes a synchronization signal, and the synchronization signal includes a non-mute signal of a first specified duration and a mute signal of a second specified duration;
the comparing the frequency sweep signal with the electrical signal to determine an electroacoustic indicator comprises:
and determining the electroacoustic index according to the synchronous signal.
Optionally, the electroacoustic indicator includes a system time delay, and the determining the electroacoustic indicator according to the synchronization signal includes:
determining the time of the non-silent signal sent by the master control system, and recording the time as T1;
determining the time for collecting the non-silent signal by the microphone, and recording the time as T2;
calculating the difference between the T2 and the T1 as the system time delay.
Optionally, the electroacoustic indicator comprises a system signal-to-noise ratio, and the determining the electroacoustic indicator according to the synchronization signal comprises: acquiring the signal amplitude determined by the microphone according to the non-silent signal, and recording the signal amplitude as V;
determining the amplitude of a background noise signal detected by a microphone after the master control system sends the mute signal, and recording the amplitude as V0;
and determining the signal-to-noise ratio of the system according to the V and the V0.
The invention also discloses a sound equipment, which comprises: the system comprises a master control system, a sound system and a pickup array, wherein the pickup array comprises a microphone;
the master control system is used for outputting a frequency sweeping signal to the sound system, receiving an electric signal sent by the microphone, comparing the frequency sweeping signal with the electric signal and determining an electroacoustic index;
the sound system is used for converting the received sweep frequency signal into an acoustic signal and playing the acoustic signal;
the microphone is used for collecting the sound signals played by the sound system, converting the collected sound signals into electric signals and outputting the electric signals to the master control system.
The invention also discloses sound testing equipment, which comprises a shielding box, sound equipment to be tested arranged in the shielding box and a diffuser arranged at the bottom of the shielding box, wherein the sound equipment to be tested is arranged above the diffuser;
the sound equipment that awaits measuring includes: the system comprises a master control system, a sound system and a pickup array, wherein the pickup array comprises a microphone;
the master control system is used for outputting a frequency sweeping signal to the sound system, receiving an electric signal sent by the microphone, comparing the frequency sweeping signal with the electric signal and determining an electroacoustic index;
the sound system is used for converting the received sweep frequency signal into an acoustic signal and playing the acoustic signal;
the diffuser is used for uniformly diffusing the sound signals played by the sound system to the periphery;
the microphone is used for collecting the sound signals played by the sound system, converting the collected sound signals into electric signals and outputting the electric signals to the master control system.
Optionally, the shielding box comprises a cylindrical acoustic shielding box with a circular inner wall.
Optionally, the diffuser is a conical diffuser.
Compared with the prior art, the invention has the following advantages:
in the embodiment of the invention, the closed-loop detection of the electroacoustic index is realized by means of the self facility of the intelligent sound equipment, the sweep frequency signal is output to the sound system through the main control system, the sound system converts the received sweep frequency signal into the acoustic signal and plays the acoustic signal, the microphone converts the acquired acoustic signal into the electric signal after acquiring the acoustic signal played by the sound system and outputs the electric signal to the main control system, and the main control system compares the sent sweep frequency signal with the received electric signal to determine the electroacoustic index. The obtained index is the result of the combined action of the sound system and the microphone, the test of the two parts is completed at one time, no additional equipment investment is needed in the whole process, the detection cost is reduced, the process is simple, and the efficiency is high.
Meanwhile, the closed-loop detection of the electroacoustic indexes is realized by means of the facilities of the intelligent sound equipment, so that the detection precision can be continuously improved along with the accumulation of the production quantity in the detection process.
Drawings
FIG. 1 is a schematic diagram of a microphone test in the background of the invention;
FIG. 2 is a schematic diagram of a sound system test in the background of the invention;
FIG. 3 is a flow chart illustrating steps of a method for testing audio equipment according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an audio device in an embodiment of an audio device testing method according to the present invention;
fig. 5 is a schematic diagram of a frequency sweep signal in an embodiment of a sound equipment testing method according to the present invention;
fig. 6 is a schematic diagram of a frequency response curve in an embodiment of a sound equipment testing method according to the present invention;
FIG. 7 is a front sectional view of a sound testing apparatus according to an embodiment of the present invention;
FIG. 8 is a top view of an acoustic test apparatus according to an embodiment of the present invention;
fig. 9 is a block diagram of an audio device according to an embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Referring to fig. 3, a flow chart of steps of an embodiment of a method for testing an audio device is shown according to an embodiment of the present invention. As shown in the schematic structural diagram of the audio device in fig. 4, the audio device may include: a main control system 402, a sound system 403, and a sound pickup array 401.
Further, as shown in fig. 4, the pickup array 401 may include N microphones and a digital signal processing unit DSP; the sound system 403 may include a power amplifier (abbreviated as a power amplifier), a speaker, and the like.
Based on the structure of the audio device in fig. 4, the embodiment of the present invention may specifically include the following steps:
in the embodiment of the invention, the frequency sweep signal can be sent out through the master control system.
In a specific implementation, the frequency sweep signal may be a set of audio test sequences that may include audio signals at frequencies from 20Hz to 20 KHz.
In an optional embodiment of the present invention, the head of the frequency sweep signal may include a synchronization signal, where the synchronization signal is an identifier for performing signal synchronization, so that a subsequent receiving system can determine when a test is started, and thus, a part of the frequency signals are prevented from being lost.
Specifically, as shown in the frequency sweep signal diagram of fig. 5, the frequency sweep signal may include a synchronization signal and an audio test sequence. The selection of the frequency of the synchronization signal may follow the following principle: the audio frequency testing sequence is not a frequency point in a normal audio frequency testing sequence and is in a frequency band with good indexes and the capability of normal work of most audio systems. For example, the synchronization signal may be selected to be around 1 KHz.
For example, in fig. 5, the frequency of the synchronization signal (i.e., the synchronization head in fig. 5) may be 1020Hz, and the audio test sequence may be composed of audio signals of several frequencies between 20Hz and 20 KHz.
In one embodiment, the synchronization signal may include a non-mute signal of a first specified duration and a mute signal of a second specified duration. The first specified time length and the second specified time length may be determined according to actual requirements, and may be set to be greater than the duration of the signal of each frequency in the audio test sequence, which is not limited by the present invention. For example, as shown in fig. 5, the signal at each frequency in the audio test sequence lasts 1 second, then the synchronization signal may include a non-mute signal at a frequency of 1020Hz for 2 seconds and a mute signal for 2 seconds.
the master control system outputs the frequency sweeping signals to the sound system, and the frequency sweeping signals are converted into sound signals through the power amplifier and the loudspeaker and are played.
in order to output an original electric signal to the main control system to improve the accuracy of an electroacoustic index output by the main control system, the embodiment of the invention can set the DSP to be in a closed state, namely, the functions of noise reduction, reverberation removal and the like of the DSP are closed, so that the original signal is input to the main control system.
And 304, the master control system receives the electric signal sent by the microphone, compares the sweep frequency signal with the electric signal and determines an electroacoustic index.
After the master control system receives the electric signal sent by the microphone, the electric signal can be compared with the sent sweep frequency signal, and the electroacoustic index is calculated.
As an example, the electroacoustic indicators may include, but are not limited to, indicators of frequency response, distortion, sensitivity, etc. of the sound equipment.
In an embodiment, the electroacoustic index may further include information such as system delay, system signal-to-noise ratio, and the like, and according to the synchronization signal, the information such as system delay, system signal-to-noise ratio, and the like may be determined.
In an optional embodiment of the present invention, the system delay may be determined in the following manner:
determining the time of the non-silent signal sent by the master control system, and recording the time as T1; determining the time for collecting the non-silent signal by the microphone, and recording the time as T2; calculating the difference between the T2 and the T1 as the system time delay.
In an optional embodiment of the present invention, the following method may be adopted to determine the system signal-to-noise ratio:
acquiring the signal amplitude determined by the microphone according to the non-silent signal, and recording the signal amplitude as V; determining the amplitude of a background noise signal detected by a microphone after the master control system sends the mute signal, and recording the amplitude as V0; and determining the signal-to-noise ratio of the system according to the V and the V0.
The bottom noise signal is a signal of background noise, and because the master control system sends out a mute signal, that is, the system is silent, at this time, the microphone can only detect the bottom noise signal.
In specific implementation, when the master control system starts testing the sound equipment, firstly, a non-mute signal of 1020Hz is sent, and the recording time is T1, when the microphone detects a synchronization signal of 1020Hz sent by the speaker, the recording time is T2, the amplitude of the signal converted by the microphone is obtained and recorded as V, then the master control system silences for a second specified duration (that is, sends a mute signal of the second specified duration), at this time, the speaker also silences for the second specified duration, the microphone detects a bottom noise signal, that is, a signal of background noise, and the amplitude of the bottom noise signal detected by the microphone can be obtained and recorded as V0. The system delay is T2-T1; the system signal-to-noise ratio is: 20log10(V/V0)。
In the embodiment of the invention, the system delay is calibrated by using the synchronous signal, then the real test sequence is started, and simultaneously the indexes such as the signal-to-noise ratio of the system can be tested by using the synchronous signal, so that the conditions that the master control system controls the loudspeaker to sound and the delay between the signals received by the microphone is uncertain and fluctuated due to the factors such as the system delay, the individual difference of device parameters and the like are avoided.
In a specific implementation, after the master control system finishes sending the synchronization signal, the master control system may start sending a formal audio test sequence, record the level output by the microphone for each frequency point in the audio test sequence, and generate a frequency response curve of the system. For example, taking a pickup array of 6 microphones as an example, the corresponding 6 frequency response curves can be obtained as shown in fig. 6, and as can be seen from fig. 6, the frequency response curve corresponding to each microphone is relatively stable.
In one embodiment, after the main control system obtains the electroacoustic index through testing, the electroacoustic index can be sent to a server, and the server performs storage and unified management. The server provided by the embodiment of the invention is only used for interacting with the intelligent sound equipment, collecting the test result and the like, and does not participate in the test process.
In the embodiment of the invention, the closed-loop detection of the electroacoustic index is realized by means of the self facility of the intelligent sound equipment, the sweep frequency signal is output to the sound system through the main control system, the sound system converts the received sweep frequency signal into the acoustic signal and plays the acoustic signal, the microphone converts the acquired acoustic signal into the electric signal after acquiring the acoustic signal played by the sound system and outputs the electric signal to the main control system, and the main control system compares the sent sweep frequency signal with the received electric signal to determine the electroacoustic index. According to the embodiment of the invention, the microphone and the loudspeaker are tested as a whole, independent testing is not needed, the obtained index is the result of the combined action of the sound system and the microphone, the testing of the two parts is completed at one time, additional equipment investment is not needed in the whole process, the detection cost is reduced, the process is simple, and the efficiency is higher.
Meanwhile, the closed-loop detection of the electroacoustic indexes is realized by means of the facilities of the intelligent sound equipment, so that the detection precision can be continuously improved along with the accumulation of the production quantity in the detection process.
For simplicity of explanation, the foregoing method embodiments are described as a series of acts or combinations, but it should be understood by those skilled in the art that the present invention is not limited by the order of acts or acts described, as some steps may occur in other orders or concurrently with other steps in accordance with the invention. Further, those skilled in the art should also appreciate that the embodiments described in the specification are exemplary embodiments and that the acts and modules illustrated are not necessarily required to practice the invention.
Fig. 7 is a front sectional view of an acoustic test apparatus according to an embodiment of the present invention, and fig. 8 is a top view of an acoustic test apparatus according to an embodiment of the present invention, which may include a shielding box 701, an acoustic device under test 702 disposed in the shielding box, and a diffuser 703 disposed at the bottom of the shielding box, wherein the acoustic device under test 702 is disposed above the diffuser 703.
The audio device under test 702 may further include: a main control system (not shown), a sound system 7021, and a sound array 7022, wherein the sound array 7022 may include a microphone (e.g., 7023 shown in fig. 8);
the master control system is used for outputting a frequency sweeping signal to the sound system, receiving an electric signal sent by the microphone, comparing the frequency sweeping signal with the electric signal and determining an electroacoustic index;
the sound system 7021 is configured to convert the received sweep frequency signal into an acoustic signal, and play the acoustic signal;
the diffuser 703 is configured to uniformly diffuse the sound signal played by the sound system around;
the microphone 7022 is configured to collect an acoustic signal played by the sound system, convert the collected acoustic signal into an electrical signal, and output the electrical signal to the main control system.
In one embodiment, the shielding cage 701 may include a cylindrical acoustic shielding cage having a circular inner wall.
Further, the diffuser 703 may be a conical diffuser.
In a specific implementation, since a plurality of microphones (usually 4 to 6, symmetrically arranged at the center) are arranged on the sound pickup array, in order to ensure consistency and accuracy of a test result, it is necessary to ensure that sounds reaching each microphone are the same (loudness, phase, etc.), for this, in the embodiment of the present invention, the acoustic device to be tested is placed in a shielding box, which may include a cylindrical acoustic shielding box with a circular inner wall as an example.
In the embodiment of the invention, a diffuser can be arranged at the center of the bottom of the shielding box, and the diffuser can be a conical diffuser optionally. In the embodiment of the present invention, the sound equipment may be disposed above the diffuser, and in combination with the feature of symmetric center of the shielding box, the sound emitted by the sound equipment is uniformly diffused in the direction of 360 degrees through the diffuser 703, so as to reduce aliasing of the sound, enhance energy reaching the microphones, and enable the sound to reach each microphone indiscriminately.
Referring to fig. 9, a block diagram of an embodiment of an audio apparatus according to an embodiment of the present invention is shown, where the audio apparatus 9 includes: the system comprises a main control system 901, a sound system 902 and a sound pickup array 903, wherein the sound pickup array 903 comprises a microphone;
the main control system 901 is configured to output a frequency sweep signal to the sound system, receive an electrical signal sent by the microphone, compare the frequency sweep signal with the electrical signal, and determine an electroacoustic index;
the acoustic system 902 is configured to convert the received frequency sweep signal into an acoustic signal, and play the acoustic signal;
the microphone is used for collecting the sound signals played by the sound system, converting the collected sound signals into electric signals and outputting the electric signals to the master control system.
In an optional embodiment of the present invention, the sound pickup array 903 may further include a digital signal processing unit DSP, and the acoustic device 9 may further include the following modules:
and the function closing module is used for setting the DSP to be in a closing state after the microphone converts the sound signal into an electric signal.
In an optional embodiment of the present invention, the head of the sweep signal includes a synchronization signal, where the synchronization signal includes a non-mute signal of a first specified duration and a mute signal of a second specified duration;
the master control system 901 is further configured to:
and determining the electroacoustic index according to the synchronous signal.
In an optional embodiment of the present invention, the electroacoustic indicator includes a system time delay, and the main control system 901 is further configured to:
determining the time of the non-silent signal sent by the master control system, and recording the time as T1;
determining the time for collecting the non-silent signal by the microphone, and recording the time as T2;
calculating the difference between the T2 and the T1 as the system time delay.
In an optional embodiment of the present invention, the electroacoustic indicator includes a system signal-to-noise ratio, and the main control system 901 is further configured to:
acquiring the signal amplitude determined by the microphone according to the non-silent signal, and recording the signal amplitude as V;
determining the amplitude of a background noise signal detected by a microphone after the master control system sends the mute signal, and recording the amplitude as V0;
and determining the signal-to-noise ratio of the system according to the V and the V0.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
Finally, it should also be 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 like elements in a process, method, article, or apparatus that comprises the element.
The sound equipment testing method, the sound testing equipment and the sound equipment provided by the invention are described in detail, specific examples are applied in the text to explain the principle and the implementation mode of the invention, and the description of the above embodiments is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (9)
1. A sound device testing method, characterized in that the sound device comprises: the system comprises a master control system, a sound system and a pickup array, wherein the pickup array comprises a microphone;
the method comprises the following steps:
outputting a frequency sweeping signal to the sound system through the master control system;
the sound system converts the received sweep frequency signal into an acoustic signal and plays the acoustic signal;
collecting sound signals played by the sound system through the microphone, converting the collected sound signals into electric signals, and outputting the electric signals to the master control system;
and the master control system receives the electric signal sent by the microphone, compares the sweep frequency signal with the electric signal and determines an electroacoustic index.
2. The method of claim 1, wherein the pickup array further comprises a digital signal processing unit, the method further comprising:
setting the digital signal processing unit to an off state after the microphone converts the acoustic signal to an electrical signal.
3. A method as claimed in claim 1 or 2, wherein the head of the swept frequency signal comprises a synchronisation signal comprising a non-muted signal of a first specified duration and a muted signal of a second specified duration;
the comparing the frequency sweep signal with the electrical signal to determine an electroacoustic indicator comprises:
and determining the electroacoustic index according to the synchronous signal.
4. The method of claim 3, wherein said electro-acoustic indicator comprises a system time delay, and wherein said determining said electro-acoustic indicator from said synchronization signal comprises:
determining the time of the non-silent signal sent by the master control system, and recording the time as T1;
determining the time for collecting the non-silent signal by the microphone, and recording the time as T2;
calculating the difference between the T2 and the T1 as the system time delay.
5. The method of claim 3, wherein said electroacoustic indicator comprises a system signal-to-noise ratio, and wherein said determining said electroacoustic indicator from said synchronization signal comprises: acquiring the signal amplitude determined by the microphone according to the non-silent signal, and recording the signal amplitude as V;
determining the amplitude of a background noise signal detected by a microphone after the master control system sends the mute signal, and recording the amplitude as V0;
and determining the signal-to-noise ratio of the system according to the V and the V0.
6. An acoustic apparatus, characterized by comprising: the system comprises a master control system, a sound system and a pickup array, wherein the pickup array comprises a microphone;
the master control system is used for outputting a frequency sweeping signal to the sound system, receiving an electric signal sent by the microphone, comparing the frequency sweeping signal with the electric signal and determining an electroacoustic index;
the sound system is used for converting the received sweep frequency signal into an acoustic signal and playing the acoustic signal;
the microphone is used for collecting the sound signals played by the sound system, converting the collected sound signals into electric signals and outputting the electric signals to the master control system.
7. The sound testing equipment is characterized by comprising a shielding box, sound equipment to be tested and a diffuser, wherein the sound equipment to be tested is arranged in the shielding box, and the diffuser is arranged at the bottom of the shielding box;
the sound equipment that awaits measuring includes: the system comprises a master control system, a sound system and a pickup array, wherein the pickup array comprises a microphone;
the master control system is used for outputting a frequency sweeping signal to the sound system, receiving an electric signal sent by the microphone, comparing the frequency sweeping signal with the electric signal and determining an electroacoustic index;
the sound system is used for converting the received sweep frequency signal into an acoustic signal and playing the acoustic signal;
the diffuser is used for uniformly diffusing the sound signals played by the sound system to the periphery;
the microphone is used for collecting the sound signals played by the sound system, converting the collected sound signals into electric signals and outputting the electric signals to the master control system.
8. The sound testing apparatus of claim 7, wherein the shielding box comprises a cylindrical acoustic shielding box having a circular inner wall.
9. The acoustic testing apparatus of claim 7 or 8, wherein the diffuser is a conical diffuser.
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| CN113329315A (en) * | 2021-05-24 | 2021-08-31 | 歌尔股份有限公司 | Detection method, device and equipment of audio playing equipment and storage medium |
| CN113496709A (en) * | 2020-04-07 | 2021-10-12 | 上海擎感智能科技有限公司 | In-vehicle sound effect remote online evaluation method and system, storage medium and server |
| WO2021203654A1 (en) * | 2020-04-07 | 2021-10-14 | 深圳回收宝科技有限公司 | Audio test system and audio test method for electronic product |
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