CN111866692A - Sound structure preparation method, sound structure, simulated human head and testing method using sound structure - Google Patents
Sound structure preparation method, sound structure, simulated human head and testing method using sound structure Download PDFInfo
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- CN111866692A CN111866692A CN202010699970.0A CN202010699970A CN111866692A CN 111866692 A CN111866692 A CN 111866692A CN 202010699970 A CN202010699970 A CN 202010699970A CN 111866692 A CN111866692 A CN 111866692A
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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
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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
- H04R31/00—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor
Abstract
The invention discloses a sound structure preparation method, a sound structure, a simulated human head and a test method using the sound structure and the simulated human head, wherein first data of a voice generated by a real human mouth and second data of a voice sound field in a real human auditory canal are obtained; computing an acoustic transfer model based on the first data and the second data; constructing an acoustic structure which is arranged in the simulated auditory canal and realizes a voice sound field in the auditory canal based on the acoustic transmission model; the sound structure is provided with a middle-high frequency band sound energy adjusting cavity for implementing sound energy adjustment on a middle-high frequency band and a low-frequency band sound energy adjusting part for implementing sound energy adjustment on a low frequency band, the sound structure is arranged in a simulated auditory canal of a simulated human head, a voice sound field with the same characteristics as that in the auditory canal of a real human can be formed, the requirement of audio index test of an earphone product adopting an MIC (microphone) pickup auditory canal through an earphone front cavity as an uplink communication scheme can be met, and the wider audio performance test function of the simulated human head is realized.
Description
Technical Field
The invention belongs to the technical field of testing, and particularly relates to a sound structure preparation method, a sound structure, a simulated human head and a testing method using the sound structure.
Background
With the popularization of hybrid ANC (active noise reduction) technology, more and more earphones have the functions of hybrid ANC. The feedback ANC function requires that a MIC (microphone) is placed in the front cavity of the earphone to pick up external noise reaching the ear canal and perform inverse superposition cancellation through the feedback ANC, so as to achieve the purpose of actively reducing local noise.
When a person produces a sound, the sound is transmitted to an ear canal through various ways, such as the auditory canal to the middle ear and the middle ear through the tympanic membrane to form a voice sound field; the earphone is worn well, isolation of more than 30dB can be formed on surrounding noise, therefore, in the use scenes with low signal-to-noise ratio such as wind noise and subway, the microphone of the front cavity of the earphone is used for picking up a voice sound field in an ear canal, so that the earphone becomes an ideal uplink conversation scheme, and barrier-free conversation can be realized in the use scenes with low signal-to-noise ratio such as wind noise and subway.
The human simulator usually comprises a simulated trunk and a simulated head arranged on the simulated trunk, wherein the simulated head usually comprises a simulated mouth part responsible for sound reproduction and a simulated ear part responsible for sound recording, so that the human simulator can well simulate sound fields around the head and the trunk of the human simulator and can be used for testing the audio performance of earphone products.
However, in the existing design of such a dummy, when the real person produces sound, the sound reaches the sound field of the ear canal through the conduction paths of eustachian tube and skeleton vibration, etc., so that the requirement of the audio index test of the earphone product adopting the scheme that the MIC of the front cavity of the earphone picks up the sound field of the sound in the ear canal as an uplink call cannot be met.
Disclosure of Invention
The invention aims to provide an acoustic structure preparation method, an acoustic structure, a simulated human head and a testing method thereof, wherein an acoustic transmission model of a sound field generated by a real person and a voice field in an auditory canal is established, and an acoustic structure of the voice field consistent with the real person is established in the auditory canal of the simulated human head based on the acoustic transmission model, so that the simulated human head can be used for carrying out wider audio performance tests, and the technical problem that the existing simulated human cannot meet the audio index testing requirement of an earphone product adopting a scheme of picking up the voice field in the auditory canal as an uplink call through an MIC (microphone) of an earphone front cavity is solved.
In order to solve the technical problems, the invention adopts the following technical scheme:
a method for preparing an acoustic structure in a simulated auditory canal is provided, which comprises the following steps: acquiring first data of a voice produced by a mouth of a real person and second data of a voice sound field in an auditory canal of the real person; computing an acoustic transfer model based on the first data and the second data; and constructing an acoustic structure which is arranged in the simulated auditory canal and realizes the voice sound field in the auditory canal based on the acoustic transmission model.
Further, the first data is a frequency response curve of the real mouth; the second data is a frequency response curve of a voice sound field in the ear canal of the real person; calculating an acoustic transfer model based on the first data and the second data, specifically: and obtaining the acoustic transmission model according to the difference between the frequency response curve of the first data and the frequency response curve of the second data.
Further, acquire the first data of real person's mouth pronunciation and the second data of the interior pronunciation sound field of real person's duct, specifically do: acquiring first data of a real mouth of a set example respectively sounding according to high volume, medium volume and low volume through a first measuring microphone; acquiring second data of a voice sound field in the auditory canal of the real person when the mouth of the real person respectively produces sound according to high volume, medium volume and low volume by a second measuring microphone according to the setting example; then, calculating an acoustic transfer model based on the first data and the second data, specifically including: calculating a singleton acoustic transfer model based on the first data and the second data of the singleton sample respectively; and averaging the single-case acoustic transmission models of the setting example to obtain the acoustic transmission model.
It is presented an acoustic structure for simulating inside an ear canal, comprising: the middle-high frequency band sound energy adjusting cavity is provided with a sound inlet and is used for connecting a sound field of the simulated mouth part; the low-frequency band acoustic energy regulating part is communicated with the medium-high band acoustic energy regulating cavity and is placed in the simulated auditory canal; sound absorption materials used for adjusting sound energy parameters of the sound structure are filled in the middle-high frequency band sound energy adjusting cavity and the low frequency band sound energy adjusting piece; wherein the acoustic structure is prepared based on an acoustic transfer model; the acoustic transfer model is obtained as follows: acquiring first data of a voice produced by a mouth of a real person and second data of a voice sound field in an auditory canal of the real person; an acoustic transfer model is calculated based on the first data and the second data.
Furthermore, the medium-high frequency band energy regulating cavity is of a variable cross-section acoustic waveguide structure; the low-frequency band acoustic energy adjusting piece is a tubular structure which is composed of at least one resonator and has a hollow structure; the medium-high frequency band acoustic energy adjusting cavity is communicated with the hollow structure; the resonator consists of a vibrating diaphragm and a cavity behind the vibrating diaphragm, and the hollow structure is formed on one side of the vibrating diaphragm.
Further, the medium-high frequency band energy regulating cavity comprises: the cylindrical cavity main body is of a concave structure at one side connected with the low-frequency band acoustic energy adjusting piece; and the connecting cavity extends out of the central position of the concave structure and is communicated with the hollow structure of the low-frequency band acoustic energy adjusting piece.
Further, a sound inlet of the medium-high frequency band energy regulating cavity is provided with a first plug, and the tail end of the hollow structure is provided with a second plug.
Further, the ratio of the sectional areas of the cylindrical cavity main body and the connecting cavity is 0.0225; the length of the connecting cavity is derived based on the upper frequency limit of the acoustic structure tuning.
Providing a simulated human head, which comprises a simulated auditory canal and a simulated mouth; further comprising: the acoustic structure inside the bionic auditory canal is as described above, wherein the sound inlet of the high-frequency band acoustic energy regulating cavity is connected with the sound field of the simulated mouth; the low-frequency sound energy regulating piece is arranged in the simulated auditory canal.
The method for the simulation human head to be used for the audio index test is applied to the simulation human head and comprises the following steps: obtaining third data simulating mouth utterances and fourth data simulating output from the acoustic structure within the ear canal; calculating an initial model of acoustic transmission of the simulated human head based on the third data and the fourth data; adjusting parameters of a sound absorbing material in the acoustic structure with a target acoustic transfer model as a target to make the initial acoustic transfer model consistent with the target transfer model; wherein the target acoustic transfer model is obtained as follows: acquiring fifth data of a voice produced by the mouth of the real person and sixth data of a voice sound field in the auditory canal of the real person; calculating the target acoustic delivery model based on the fifth data and the sixth data.
Compared with the prior art, the invention has the advantages and positive effects that: according to the sound structure preparation method, the sound structure, the simulated human head and the testing method thereof, the sound transmission model between the sound field of the mouth and the sound field in the auditory canal is calculated according to the sound of the real person, the sound structure is prepared according to the sound transmission model, the sound structure is applied to the simulated auditory canal of the simulated human head, the sound can reach the sound field of the auditory canal through the conduction paths of the eustachian tube, the bone vibration and the like when the sound of the real person is simulated in the simulated human head, and the simulated human head can meet the requirement of the audio index test of an earphone product which adopts the scheme that the sound field in the auditory canal is picked up by the MIC of the front cavity of the earphone to serve as an uplink call scheme.
Other features and advantages of the present invention will become more apparent from the detailed description of the embodiments of the present invention when taken in conjunction with the accompanying drawings.
Drawings
FIG. 1 is a flow chart of a method for preparing an acoustic structure in a simulated ear canal according to the present invention;
FIG. 2 is a schematic diagram of a sound transmission model obtained by the method for preparing an acoustic structure in an artificial auditory canal according to the present invention;
FIG. 3 is a block diagram of one embodiment of an acoustic structure within a simulated ear canal in accordance with the present invention;
FIG. 4 is a block diagram of a second embodiment of an acoustic structure in a simulated ear canal in accordance with the present invention;
FIG. 5 is a schematic structural diagram of an applied acoustic structure of a simulated human head according to the present invention;
FIG. 6 is a flowchart of a method for simulating a human head for audio indicator testing according to the present invention;
FIG. 7 is a schematic diagram of the difference between the simulated human head acoustic transmission initial model and the real human target acoustic transmission model when the simulated human head is used for audio indicator testing according to the present invention;
fig. 8 is a schematic diagram of a second structure of the artificial human head applied sound structure according to the present invention.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
The invention aims to provide an acoustic structure arranged in a simulated auditory canal of a simulated human head, which can simulate a voice sound field in the auditory canal of the real human, and further can use the simulated human head to implement an audio index test of an earphone which uses the MIC of a front cavity of the earphone to pick up the voice sound field in the auditory canal as an uplink communication scheme.
In order to prepare the acoustic structure, the invention firstly provides a preparation method of the acoustic structure in the simulated auditory canal, which comprises the following steps as shown in fig. 1:
step S11: first data of a voice production of a mouth of a real person and second data of a voice sound field in an ear canal of the real person are acquired.
In the step, first data of a mouth sounding when a real person sounds and second data of a voice sound field in an ear canal of the real person are acquired in a stable test environment.
In some embodiments of the invention, the real person test is performed in an anechoic chamber with a cutoff frequency of 300Hz and a free field radius > 1.2 m.
For testing, a real person sits in the center of the intersection of the anechoic chamber diagonals and places a first measurement microphone 1 inch from the person's mouth, preferably using a calibrated B & K4191 measurement microphone. A second measurement microphone is placed in the human ear canal, preferably using a small volume, flat-frequency response MEMS MIC cell, and an in-ear headphone fitted with a rubber cuff to seal the ear canal.
During actual testing, an auxiliary tool needs to be manufactured to ensure that the distance between the mouth of a person and the first measuring microphone is kept unchanged in the recording process.
Since the diameter of the eustachian tube varies with the degree of opening of the mouth, in some embodiments of the present invention, the subject is required to recite the same phrase at three volumes, high volume, medium volume, and low volume, and when the subject recites the phrase, first data of the speech sound field of the subject's mouth is collected by the first measuring microphone, and second data of the speech sound field of the subject's mouth while the subject is speaking is collected by the second measuring microphone.
In the recording process, data inaccuracy caused by factors such as distance change between a human mouth and a microphone or sealing state change of an ear canal may occur, so that the quality of the microphone to be measured needs to be checked, and a user can replace the testee behind the recording without errors. And through analysis of test data, the result difference of the obtained sound transmission model is small when the same real person testee tests at different volumes, and the sound transmission model can be considered to be consistent, so that the same sound transmission model can be adopted to represent the biological audio characteristics of the sound field from the human mouth to the sealed auditory canal.
In order to obtain a mean sample-meaningful transfer model, a population of subjects is required to cover a certain distribution of bioaudio characteristics, and the data collection is only completed when the number of collected subjects reaches a set number, and in some embodiments of the present invention, 30 subjects are collected, including 15 male subjects, with an age distribution of 14 to 60 years, and 15 female subjects, with an age distribution of 14 to 62 years.
Step S12: an acoustic transfer model is calculated based on the first data and the second data.
Generally, collecting the sound of a real mouth to obtain time domain waveform data, and obtaining a frequency response curve as first data by analyzing the frequency domain of the time domain waveform data; and acquiring a voice sound field in the auditory canal to obtain time domain waveform data, and analyzing the frequency domain of the time domain waveform data to obtain a frequency response curve which is second data.
According to the difference between the frequency response curve of the first data and the frequency response curve of the second data, the acoustic transfer curve shown in fig. 2, that is, the acoustic transfer model according to the present invention, can be obtained.
In some embodiments of the present invention, a singleton acoustic transmission model is first calculated according to the first data and the second data of the singleton subject, and then the singleton acoustic transmission models of the set examples are averaged to obtain a final acoustic transmission model.
Step S13: and constructing an acoustic structure which is arranged in the simulated auditory canal and realizes a voice sound field in the auditory canal based on the acoustic transmission model.
According to the steps S11 to S12, the sound transmission model between the mouth sounding of the real person and the sound field of the voice in the auditory canal is obtained, the sound transmission model embodies the conversion relation between the mouth sounding of the real person and the sound field of the voice in the auditory canal, namely, according to the mouth sounding data, the data of the sound field of the voice in the auditory canal can be obtained based on the sound transmission model.
Based on the sound structure in the simulated auditory canal, the sound structure in the simulated auditory canal is prepared based on the obtained sound transmission model, and has the characteristics of the sound transmission model, so that when the sound structure is placed in the simulated auditory canal of a simulated human head, a voice sound field in the auditory canal can be simulated in the simulated auditory canal.
Specifically, as shown in fig. 3, the acoustic structure prepared according to the acoustic transmission model of the present invention includes a middle-high frequency band acoustic energy adjusting cavity I and a low frequency band acoustic energy adjusting part II. The middle-high frequency band sound energy adjusting cavity I is provided with a sound inlet 31 for connecting a sound field of a simulation mouth of a simulation human head; the low-frequency band acoustic energy regulating part II is communicated with the medium-high band acoustic energy regulating cavity I and is placed in the simulated auditory canal.
And sound absorption materials for adjusting sound energy parameters of the sound structure are filled in the middle-high frequency band sound energy adjusting cavity I and the low frequency band sound energy adjusting piece II. In some embodiments of the invention, the medium-high frequency band acoustic energy adjusting cavity I is filled with melamine foam with a micro-through hole structure, and is prepared by adopting a thermal compression process, wherein the compression ratio is 5: 1; in some embodiments of the present invention, the low-frequency acoustic energy adjusting member II is filled with glass wool.
The low-frequency band acoustic energy adjusting part II is a cylindrical structure which is composed of at least one resonator and is provided with a hollow structure 41, and the medium-high frequency band acoustic energy adjusting cavity I is communicated with the hollow structure 41. In the embodiment shown in fig. 3, a cylindrical acoustic waveguide structure is formed by three drum-shaped mufflers (resonators), each of which is formed by a different diaphragm 42 with a cavity 43 behind it, one side of the diaphragm 42 forming the hollow structure 41 described above.
The medium-high frequency band acoustic energy adjusting cavity I is designed by adopting a variable cross-section acoustic waveguide structure and comprises a cylindrical cavity main body 32 and a connecting cavity 33 as shown in figure 3; one side of the cylindrical cavity main body 32 connected with the low-frequency sound energy adjusting piece II is a concave structure, a connecting cavity 33 extends out of the center of the concave structure, and the connecting cavity 33 is communicated with the hollow structure 41 of the low-frequency sound energy adjusting piece II. The length L of the connecting cavity 33 is determined by the upper limit frequency of the frequency band, for example, the upper limit frequency is 10KHZ, and the length L is 344/(4 × 10000/2) =0.017m =17mm, where 344 is the speed of sound of air at normal temperature. The ratio of the sectional areas of the cylindrical chamber body 32 and the connecting chamber 33 is 0.0225.
In some embodiments of the present invention, as shown in fig. 3, the sizes of the portions of the middle and high frequency band acoustic energy adjusting cavity I are as follows: r =15mm, a =0.15R, b =0.7R, Lb =0.4R, LH =25mm, L =17mm, the above acoustic structure can obtain the attenuation of the acoustic energy of more than 30dB in the 1500HZ-10000HZ frequency band.
In some embodiments of the present invention, as shown in fig. 3, the size parameters of the parts of the low-frequency band acoustic energy adjusting part II are determined as follows: when L1=12mm and a silica gel diaphragm with a thickness of 0.15mm is used, the resonance point of the corresponding drum-shaped muffler is 220 HZ; when L2=7.5mm and a TPU composite diaphragm with the thickness of 0.8mm is used, the resonance point of the corresponding drum-shaped silencer is 450 HZ; when L3=4.5mm and a TPU composite diaphragm with the thickness of 0.4mm is used, the resonance point of the corresponding drum-shaped silencer is 980 HZ; the acoustic structure can obtain ideal sound energy regulation results from 100HZ to 1500 HZ.
In some embodiments of the present invention, as shown in fig. 4, the middle-high frequency acoustic energy adjusting cavity I is configured with a first plug 35, the radius of the first plug 35 is 0.98R, the length of the first plug is 1.5mm, a structure 36 which is convenient to pull out is arranged on the plug body, and after the first plug 35 is plugged into the middle-high frequency acoustic energy adjusting cavity I, the sound inlet 31 of the middle-high frequency acoustic energy adjusting cavity I is acoustically sealed well, and sound cannot be introduced from the sound inlet 31.
In some embodiments of the present invention, the low frequency band acoustic energy adjusting member II is configured with a second plug 44, the radius of which is 0.98a, the length of which is 1.5mm, the plug body is provided with a structure 45 which is convenient to pull out, the second plug 44 is plugged into the hollow structure 41 of the low frequency band acoustic energy adjusting member II, the hollow structure 41 of the low frequency band acoustic energy adjusting member II is acoustically sealed well, and sound cannot be transmitted from the low frequency band acoustic energy adjusting member II.
As shown in fig. 5, when the obtained acoustic structure in the ear canal is placed in a simulated human head, the sound inlet 31 of the middle-high frequency band acoustic energy adjusting cavity I is connected with the sound field of the simulated mouth 5, and the low frequency band acoustic energy adjusting piece II is placed in the simulated ear canal 6; when the simulated mouth 5 produces sound, the sound enters the simulated auditory canal 6 from the middle-high frequency band sound energy adjusting cavity I through the low frequency band sound energy adjusting piece II to form a voice sound field with the same characteristics as the real auditory canal.
When the artificial human head is configured with the sound structure, a voice sound field with the same characteristics as that in the real human auditory canal can be formed in the artificial auditory canal, so that the requirement of an audio index test of an earphone product adopting an earphone front cavity MIC to pick up the voice sound field in the auditory canal as an uplink communication scheme is met, and the artificial human head can be subjected to a wider audio performance test.
Specifically, as shown in fig. 6, the present invention provides a method for testing audio indicators by simulating human head, including:
step S61: third data simulating mouth utterances and fourth data simulating output from acoustic structures within the ear canal are obtained.
Starting the sounding of a simulated mouth of the simulated human head, and acquiring sounding data of the simulated mouth as third data through a mouth measuring microphone; when the simulated mouth produces sound, the sound energy adjusting cavity I of the sound structure in the middle and high frequency bands adjusts the sound energy of the sound produced by the simulated mouth in a frequency band above 1500HZ, the sound energy adjusting part II of the low frequency band adjusts the sound energy of a frequency band between 100HZ and 1500HZ, a voice sound field with the same characteristics as a voice sound field in the auditory canal of a real person is output, and a measuring microphone in the auditory canal is adopted to acquire the voice sound field data output by the sound structure to serve as fourth data.
Step S62: an initial model of the acoustic transfer simulating the human head is calculated based on the third data and the fourth data.
An initial model of the acoustic transmission simulating the human head is calculated in the manner referred to in step S12.
Step S63: parameters of the sound absorbing material in the acoustic structure are adjusted with the target acoustic transfer model as a target so that the initial acoustic transfer model is consistent with the target transfer model.
The target sound transmission model is the sound transmission model between the mouth sound production and the voice sound field in the ear canal when the real person produces the sound obtained in the steps S11 to S12, the sound transmission model obtained by the real person producing the sound is taken as the target sound transmission model, and as shown in fig. 7, parameters of the sound absorbing material in the middle-high frequency band sound energy adjusting cavity I and/or the low frequency band sound energy adjusting part II of the sound structure are adjusted according to the difference between the sound transmission initial model and the target sound transmission model, so that the transmission initial model is consistent with the target sound transmission model.
Based on the above steps S61 to S63, an audio index test of the earphone product that picks up the in-ear-canal voice sound field as the up-call scheme by the MIC of the earphone front cavity can be started.
When the sound field in the ear canal does not need to be tested, the first plug 35 and the second plug 44 can be plugged into the sound inlet of the high-frequency sound energy adjusting cavity I and the hollow structure 41 of the low-frequency sound energy adjusting part II respectively, so as to simulate the human head to return to the normal state, as shown in fig. 8.
It should be noted that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art should also make changes, modifications, additions or substitutions within the spirit and scope of the present invention.
Claims (10)
1. The preparation method of the sound structure in the simulated auditory canal is characterized by comprising the following steps:
acquiring first data of a voice produced by a mouth of a real person and second data of a voice sound field in an auditory canal of the real person;
computing an acoustic transfer model based on the first data and the second data;
and constructing an acoustic structure which is arranged in the simulated auditory canal and realizes the voice sound field in the auditory canal based on the acoustic transmission model.
2. The method for preparing an artificial in-ear-canal acoustic structure according to claim 1, wherein the first data is a frequency response curve of a real mouth; the second data is a frequency response curve of a voice sound field in the ear canal of the real person;
calculating an acoustic transfer model based on the first data and the second data, specifically:
and obtaining the acoustic transmission model according to the difference between the frequency response curve of the first data and the frequency response curve of the second data.
3. The method for preparing an acoustic structure in a simulated auditory canal according to claim 1, wherein the acquiring of the first data of the vocalization of the mouth of the real person and the second data of the sound field of the voice in the auditory canal of the real person specifically comprises:
Acquiring first data of a real mouth of a set example respectively sounding according to high volume, medium volume and low volume through a first measuring microphone; acquiring second data of a voice sound field in the auditory canal of the real person when the mouth of the real person respectively produces sound according to high volume, medium volume and low volume by a second measuring microphone according to the setting example; then the process of the first step is carried out,
calculating an acoustic transfer model based on the first data and the second data, specifically comprising:
calculating a singleton acoustic transfer model based on the first data and the second data of the singleton sample respectively;
and averaging the single-case acoustic transmission models of the setting example to obtain the acoustic transmission model.
4. An acoustic structure for simulating an ear canal, comprising:
the middle-high frequency band sound energy adjusting cavity is provided with a sound inlet and is used for connecting a sound field of the simulated mouth part;
the low-frequency band acoustic energy regulating part is communicated with the medium-high band acoustic energy regulating cavity and is placed in the simulated auditory canal;
sound absorption materials used for adjusting sound energy parameters of the sound structure are filled in the middle-high frequency band sound energy adjusting cavity and the low frequency band sound energy adjusting piece;
wherein the acoustic structure is prepared based on an acoustic transfer model; the acoustic transfer model is obtained as follows: acquiring first data of a voice produced by a mouth of a real person and second data of a voice sound field in an auditory canal of the real person; an acoustic transfer model is calculated based on the first data and the second data.
5. The acoustic structure for simulating an ear canal of claim 4, wherein the mid-high band energy accommodating cavity is a variable cross-section acoustic waveguide structure;
the low-frequency band acoustic energy adjusting piece is a tubular structure which is composed of at least one resonator and has a hollow structure; the medium-high frequency band acoustic energy adjusting cavity is communicated with the hollow structure; the resonator consists of a vibrating diaphragm and a cavity behind the vibrating diaphragm, and the hollow structure is formed on one side of the vibrating diaphragm.
6. The in-the-ear canal acoustic structure of claim 5 wherein the mid to high band energy accommodating cavity comprises:
the cylindrical cavity main body is of a concave structure at one side connected with the low-frequency band acoustic energy adjusting piece;
and the connecting cavity extends out of the central position of the concave structure and is communicated with the hollow structure of the low-frequency band acoustic energy adjusting piece.
7. The in-the-canal acoustic structure of claim 5 wherein the inlet of the midrange energy modulation cavity is configured with a first plug and the end of the hollow structure is configured with a second plug.
8. The in-the-ear canal acoustic structure of claim 6 wherein the ratio of the cross-sectional area of the cylindrical chamber body to the connecting chamber is 0.0225; the length of the connecting cavity is derived based on the upper frequency limit of the acoustic structure tuning.
9. A simulated human head comprises a simulated auditory canal and a simulated mouth;
it is characterized by also comprising:
an acoustic structure in a biomimetic ear canal as recited in any of claims 4-8, wherein the sound inlet of the high band acoustic energy tuning cavity is connected to the sound field of the simulated mouth; the low-frequency sound energy regulating piece is arranged in the simulated auditory canal.
10. A method for testing audio index of a simulated human head, which is applied to the simulated human head as claimed in claim 9, and comprises:
obtaining third data simulating mouth utterances and fourth data simulating output from the acoustic structure within the ear canal;
calculating an initial model of acoustic transmission of the simulated human head based on the third data and the fourth data;
adjusting parameters of a sound absorbing material in the acoustic structure with a target acoustic transfer model as a target to make the initial acoustic transfer model consistent with the target transfer model;
wherein the target acoustic transfer model is obtained as follows: acquiring fifth data of a voice produced by the mouth of the real person and sixth data of a voice sound field in the auditory canal of the real person; calculating the target acoustic delivery model based on the fifth data and the sixth data.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114501288A (en) * | 2022-01-25 | 2022-05-13 | 深圳市豪恩声学股份有限公司 | Noise reduction performance test system and method for noise reduction earphone |
| CN114501288B (en) * | 2022-01-25 | 2024-03-26 | 深圳市豪恩声学股份有限公司 | Noise reduction performance test system and method for noise reduction earphone |
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