CN110557711B - Earphone testing method and earphone - Google Patents
Earphone testing method and earphone Download PDFInfo
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- CN110557711B CN110557711B CN201910815274.9A CN201910815274A CN110557711B CN 110557711 B CN110557711 B CN 110557711B CN 201910815274 A CN201910815274 A CN 201910815274A CN 110557711 B CN110557711 B CN 110557711B
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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
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- H04R29/001—Monitoring arrangements; Testing arrangements for loudspeakers
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Abstract
The earphone testing method comprises the following steps: placing the earphone sample under a first standard test condition to obtain a first test parameter; placing the earphone sample under a second standard test condition to obtain a second test parameter; obtaining a transfer function according to the first test parameter and the second test parameter; placing the earphone to be tested under a second standard test condition to obtain performance test parameters of the earphone to be tested; correcting the performance test parameters according to the transfer function to obtain standard test parameters of the earphone to be tested; calculating EQ compensation parameters of the earphone to be tested according to the standard test parameters; under a first standard test condition, the earphone sample extends into a test fixture provided with a standard microphone or an ear simulator; under the second standard test condition, the earphone sample or the earphone to be tested and the standard microphone are arranged at intervals. An earphone is also disclosed. According to the invention, the performance test parameters are converted into standard test parameters simulating real wearing effect according to the transfer function for EQ compensation, so that the performance of the earphone can be fully ensured to be consistent with the standard performance.
Description
Technical Field
The invention relates to the technical field of audio equipment, in particular to an earphone testing method and an earphone.
Background
Any earphone product needs to be subjected to performance tests for multiple times before leaving a factory so as to ensure that the acoustic performance of the earphone monomer is consistent with that of a standard product.
In the batch production process of the semi-in-ear earphones, the performance of different single loudspeakers and related structural components of the loudspeakers cause the performance of the earphone to be different from that of a standard product, and the performance of the left ear and the performance of the right ear of the same earphone are different. In order to compensate for individual performance differences or left and right ear performance differences, the conventional method is to perform EQ compensation through software, that is, compensate for defects of a speaker and a sound field through adjustment of electric signals of various frequencies, and compensate and modify various sound sources, so that the acoustic performance of different earphones after EQ compensation is consistent with the performance of a standard product, and the performance of the left and right ears of the same earphone is also consistent.
In order to determine EQ compensation parameters, in the prior art, a test fixture is usually arranged on a simulated ear or a standard microphone, a semi-in-ear headphone is placed in the test fixture, and the acoustic performance of the headphone is tested under the condition of no EQ compensation; and then performing software compensation according to the difference between the test result and the performance of the standard product to generate EQ compensation parameters and write the EQ compensation parameters into the earphone product. In use, the performance of the individual headphones is in agreement with the standard product performance under EQ compensation conditions. It will be appreciated that in the above test procedure, the accuracy of the EQ compensation parameters is completely dependent on the acoustic performance test results without EQ compensation. The shape of a test fixture in the prior art is generally a standard geometric shape, while the shape of a shell of a half-in-ear earphone has different shapes according to different products, and the edge of the test fixture is generally not in a standard curve form due to the fact that the test fixture needs to be attached to a concha cavity. After the earphone is placed into the test fixture, a gap is inevitably formed between the semi-in-ear earphone and the test fixture, sound emitted by the loudspeaker leaks from the gap, particularly, when the earphone is placed into the test fixture by an operator during testing, the earphone can be placed in the test fixture incompletely, and new errors can be introduced due to different operation methods. The deviation of the test result of the manual test is large, and the EQ compensation parameters are inaccurate, so that the performance of the final product has deviation from the performance of the standard product. In order to make there be not the gap as far as possible between half in-ear earphone and the test fixture, can also design the test fixture that matches with earphone shell shape, however, because the shape of earphone shell is various, hardly all form a complete set production test fixture to every kind of earphone, moreover, the test fixture of production non-standard geometry also necessarily leads to the increase of test cost.
Disclosure of Invention
The invention relates to a method for testing an earphone, aiming at the problem that in the prior art, an accurate EQ compensation parameter cannot be obtained due to inaccurate acoustic performance test result of an individual earphone.
The earphone testing method comprises the following steps: placing the earphone sample under a first standard test condition to obtain a first test parameter; placing the earphone sample under a second standard test condition to obtain a second test parameter; obtaining a transfer function according to the first test parameter and the second test parameter; placing the earphone to be tested under a second standard test condition to obtain performance test parameters of the earphone to be tested; correcting the performance test parameters according to the transfer function to obtain standard test parameters of the earphone to be tested; calculating EQ compensation parameters of the earphone to be tested according to the standard test parameters; under a first standard test condition, the earphone sample extends into a test fixture, and the test fixture is provided with a standard microphone or an ear simulator; under the second standard test condition, the earphone sample or the earphone to be tested and the standard microphone are arranged at intervals.
Based on a selectable transfer function, the earphone testing method disclosed by another aspect of the invention comprises the following steps: selecting at least two earphone samples with step performance difference; respectively placing the earphone samples under a first standard test condition to obtain a first sensitivity of each earphone sample under a set test frequency; respectively placing the earphone samples under a second standard test condition to obtain a second sensitivity of each earphone sample under a set test frequency; calculating a sensitivity difference between the first sensitivity and the second sensitivity for each earphone sample; calculating the average value of the sensitivity difference values of a plurality of earphone samples to obtain the average value of the sensitivity difference values; establishing a first transfer function according to the sensitivity difference mean value obtained under the plurality of set test frequencies and the set test frequency, wherein in the first transfer function, the test frequency is an input variable, and the sensitivity difference mean value is an output variable; placing the earphone to be tested under a second standard test condition to obtain the actual sensitivity of the current test frequency; acquiring a sensitivity difference mean value corresponding to the current test frequency according to the first transfer function; calculating the sum of the actual sensitivity and the sensitivity difference mean value corresponding to the current test frequency to obtain the standard test sensitivity; and calculating the EQ compensation parameters of the earphone to be tested according to the standard test sensitivity.
In order to avoid errors caused by the performance of the product during sample selection, three groups of earphone samples with step performance difference are selected and respectively correspond to a first sample grade, a second sample grade and a third sample grade; and the acoustic performance of the first sample grade, the second sample grade and the third sample grade is sequentially reduced, and the second sample grade corresponds to the acoustic performance of the standard product.
Based on another optional transfer function, the earphone testing method disclosed by another aspect of the invention comprises the following steps: placing a plurality of earphone samples with step performance difference under a first standard test condition to obtain first sensitivity of the plurality of earphone samples under a set test frequency; placing the earphone samples under a second standard test condition to obtain a second sensitivity of the plurality of earphone samples under a set test frequency; fitting a plurality of first sensitivities and second sensitivities to establish a second transfer function, wherein in the second transfer function, the second sensitivities are input variables, and the first sensitivities are output variables; placing the earphone to be tested under a second standard test condition to obtain actual sensitivity corresponding to the set test frequency; acquiring standard sensitivity corresponding to the actual sensitivity according to the second transfer function; and calculating the EQ compensation parameters of the earphone to be tested according to the standard sensitivity.
Because the frequency of the test signal is variable, a plurality of set test frequency bands in the rated frequency are preferably included, and each set test frequency band is provided with at least one set test frequency; fitting and establishing a second transfer function aiming at each set test frequency; and calling a corresponding second transfer function according to the frequency band of the current test frequency, and acquiring standard sensitivity corresponding to the actual sensitivity according to the second transfer function.
Preferably, the test signals under the first standard test condition and the second standard test condition are sinusoidal signals of the same variable frequency.
Preferably, the earphone sample and the earphone to be tested are half-in-ear earphones, so that the half-in-ear earphones with irregular edges are tested.
Preferably, when the earphone sample is placed under the first standard test condition, the housing of the earphone sample extends into the test fixture.
Preferably, when the earphone sample or the earphone to be tested is placed under the second standard test condition, the shell of the earphone sample or the earphone to be tested is opposite to the standard microphone.
The invention also discloses an earphone, which is tested by adopting the following method: placing the earphone sample under a first standard test condition to obtain a first test parameter; placing the earphone sample under a second standard test condition to obtain a second test parameter; obtaining a transfer function according to the first test parameter and the second test parameter; placing the earphone to be tested under a second standard test condition to obtain performance test parameters of the earphone to be tested; correcting the performance test parameters according to the transfer function to obtain standard test parameters of the earphone to be tested; calculating EQ compensation parameters of the earphone to be tested according to the standard test parameters; under a first standard test condition, the earphone sample extends into a test fixture, and the test fixture is provided with a standard microphone or an ear simulator; under the second standard test condition, the earphone sample or the earphone to be tested and the standard microphone are arranged at intervals.
In the invention, the test of the earphone to be tested is only carried out under the second standard test condition, the earphone to be tested and the standard microphone are arranged at intervals, the earphone to be tested and the standard microphone are independent and not in contact with each other, the test environment is stable, no artificial operation error is introduced, the performance test parameters under the second standard test condition are converted into the standard test parameters simulating the real wearing effect by using the transfer function, EQ compensation is carried out according to the standard test parameters, and the final effect can be fully ensured to be consistent with the standard performance.
Other features and advantages of the present invention will become more apparent from the following detailed description of the invention when taken in conjunction with the accompanying drawings.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a flowchart illustrating an embodiment of a testing method for an earphone according to the present invention;
FIG. 2 is a flow chart of a preferred embodiment of the testing method for earphones according to the present invention;
FIG. 3 is a flow chart of another preferred embodiment of the testing method for earphones according to the present invention;
FIG. 4 is a schematic diagram of one configuration for placing an earphone sample under first standard test conditions;
FIG. 5 is a cross-sectional view of FIG. 4;
FIG. 6 is a schematic view of another configuration for placing an earphone sample under first standard test conditions;
FIG. 7 is a schematic view of another configuration for placing an earphone sample under a second standard test condition;
fig. 8 is another schematic structural diagram of the earphone sample or the earphone to be tested under the second standard test condition.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and examples.
The terms "first," "second," "third," and the like in the description and in the claims, and in the drawings, are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
Reference throughout this specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. One skilled in the art will appreciate that the embodiments described herein can be combined with other embodiments.
Fig. 1 discloses a testing method of earphones, which has the following steps, and one of the steps is described in detail below.
S100, placing the earphone sample under a first standard test condition to obtain a first test parameter.
The earphone sample is the same earphone with known acoustic performance and the same type or the same product characteristics as the earphone to be tested, the first standard test condition A1 simulates a real wearing environment, as shown in figures 4 to 6, the earphone sample 2 extends into the test fixture 1 to form stable connection, and the fitting state of a real earphone product and human ears is simulated. The test fixture 1 is provided with a standard microphone 40 or an ear simulator 30. In the test state, the earphone sample is connected in series with a nominal source impedance and fed with a sinusoidal voltage with a variable frequency, and the sound pressure or sound pressure level at one end of the standard microphone 40 or the ear simulator 30 is a function of frequency, so as to obtain a first test parameter of the earphone sample. Specifically, under the first standard test condition a1, the earphone sample 2 is first placed in the test fixture 1 such that the housing 20 of the earphone sample and the test fixture 1 are mated, and then connected in series with a nominal source impedance to feed a sinusoidal signal of variable frequency of the earphone sample with a prescribed source electromotive force. And varying the frequency of the test signal at least within the nominal frequency range of the headset sample and recording the sound pressure or sound pressure level at each frequency. During recording, the sound pressure level and the frequency are automatically recorded by adopting a sweep frequency or step frequency source and a chart recorder or a plotter, and a graph curve expressed by decibels is obtained. And obtaining a first test parameter of the earphone sample under the first standard test condition through the frequency response curve.
Since the acoustic performance of the headphone sample is known, if the first test parameter has a significant deviation, the extreme value or significant deviation can be removed in the sampling phase without introducing new errors due to human operation.
And S200, placing the earphone sample under a second standard test condition to obtain a second test parameter.
First, the second standard test condition will be described. As shown in fig. 8, the second standard test condition a2 simulates an ideal test environment. Under the second standard test condition, the earphone sample in the test state or the earphone to be tested (as shown in fig. 2) and the standard microphone 40 are arranged at intervals, and are independent from each other and do not contact with each other, and the distance is fixed. The housing of the earphone sample or the housing of the earphone to be tested (20 shown in fig. 8) is opposite to the standard microphone, i.e. the sound outlet and the axis of the standard microphone are coincident, and the distance d is preferably set to be 1 cm. The earphone sample or the earphone to be tested is fixed at the end 21, far away from the standard microphone, of the earphone sample or the earphone to be tested, and the fixing structure cannot influence the testing process and can ensure the stability of the earphone sample or the earphone to be tested. Under the second standard test condition, because the earphone sample in the test state or the distance between the earphone to be tested and the standard microphone is fixed, the test effect is not influenced by manual operation.
The earphone sample is placed in a second standard test condition, the same frequency variable sinusoidal signal as in the first standard test condition is fed to the earphone sample, and the frequency of the test signal is varied at least within the nominal frequency range of the earphone sample, and the sound pressure or sound pressure level at each frequency is recorded. During recording, the sound pressure level and the frequency are automatically recorded by adopting a sweep frequency or step frequency source and a chart recorder or a plotter, and a graph curve expressed by decibels between the sound pressure level and the frequency is obtained. And obtaining a second test parameter of the earphone sample under a second standard test condition through the frequency response curve.
S300, obtaining a transfer function according to the first test parameter and the second test parameter.
The same earphone samples are respectively placed under a first standard test condition for simulating a real wearing environment and a second standard test condition convenient for operation and sampling to obtain a first test parameter and a second test parameter, namely, the difference between the second test parameter and the first test parameter can be obtained through comparison and analysis. Based on the difference between the first test parameter and the second test parameter, a transfer function between the test result under the first standard test condition and the test result under the second standard test condition may further be obtained. The transfer function embodies a linear relation between the test result under the first standard test condition and the test result under the second standard test condition, and if the test result under the second standard test condition is taken as an input quantity, a unique output quantity representing the test result under the first standard test condition can be obtained through the transfer function, namely the test result directly obtained under the second standard test condition is converted into the test result under the real wearing condition. Obtaining the transfer function based on the difference between the first test parameter and the second test parameter may take a variety of forms, as will be described in greater detail below.
S400, the earphone to be tested is placed under the second standard test condition to obtain the performance test parameters of the earphone to be tested.
As described above, under the second standard test condition, the earphone to be tested and the standard microphone are spaced from each other, and the earphone to be tested is fixed at the end far away from the standard microphone. The same frequency-variable sinusoidal signal is fed to the earphone sample and the frequency of the test signal is varied at least within the nominal frequency range of the earphone sample and the sound pressure or sound pressure level at each frequency is recorded, resulting in a graphical plot between sound pressure level and frequency in decibels.
And S500, correcting the performance test parameters obtained in the step S400 according to the transfer function obtained in the step S300 to obtain standard test parameters of the earphone to be tested.
And further correcting the performance test parameters of the earphone to be tested into standard test parameters. Specifically, the performance test parameters of the earphone to be tested obtained under the second standard test condition are input into the transfer function as input variables, and the transfer function embodies a linear relation between the test result under the first standard test condition and the test result under the second standard test condition, so that the output variables of the transfer function are the standard test parameters of the earphone to be tested corresponding to the first standard test condition, namely, the simulation real test environment.
S600, calculating EQ compensation parameters of the earphone to be tested according to the standard test parameters.
In the earphone testing method, the testing of the earphone to be tested is only carried out under the second standard testing condition, the earphone to be tested and the standard microphone are arranged at intervals, the earphone to be tested and the standard microphone are independent and not in contact with each other, the testing environment is stable, manual operation errors cannot be introduced, the performance testing parameters under the second standard testing condition are converted into standard testing parameters simulating real wearing effects by using a transfer function, EQ compensation is carried out according to the standard testing parameters, and the final effect can be fully ensured to be consistent with the standard performance.
A method of constructing a transfer function is described in detail with reference to fig. 2, and specifically includes the steps of:
s11, selecting at least two earphone samples with step performance difference.
In particular, the acoustic performance of the headphone sample is known. In order to avoid data deviation caused by random sample selection, preferably, three grades of earphone samples with different step performance differences are selected, and the three grades respectively correspond to a first sample grade, a second sample grade and a third sample grade, wherein the acoustic performance of the first sample grade, the acoustic performance of the second sample grade and the acoustic performance of the third sample grade are decreased, and the acoustic performance of the second sample grade corresponds to the acoustic performance of a standard product. It will be appreciated that for earphone samples that have been sorted, there are typically multiple product performance levels in steps, such as high-level, standard, low-level; or super, premium, standard, cull, etc. According to the statistical principle of normal distribution, three grades of earphone samples with different step performances are selected to cover most products basically, and deviation caused by sample selection is in a controllable or acceptable range. Of course, more earphone samples with different step performance may be selected.
And S12, respectively placing the earphone samples of different grades under a first standard test condition, and obtaining a first sensitivity of each earphone sample under a set test frequency.
In brief, the sensitivity is the sound pressure or sound pressure level generated in the test side, i.e. the standard microphone or ear simulator, when a test signal with a set test frequency consumes 1mW at a pure impedance equal to the earphone sample or the rated impedance of the earphone to be tested.
And S13, further respectively placing the earphone samples under second standard test conditions, and obtaining a second sensitivity of each earphone sample at the set test frequency.
S14, calculating a sensitivity difference between the first sensitivity and the second sensitivity of each earphone sample. The sensitivity difference directly represents the test difference between the first standard test condition and the second standard test condition.
And S15, calculating the average value of the sensitivity difference values of a plurality of earphone samples to obtain the average value of the sensitivity difference.
And S16, establishing a first transfer function according to the sensitivity difference mean value and the set test frequency obtained under the plurality of set test frequencies, wherein in the first transfer function, the test frequency is an input variable, and the sensitivity difference mean value is an output variable. In the modeling process of the first transfer function, a plurality of points on a plane can be obtained by taking the set test frequency as an abscissa and the sensitivity difference mean value as an ordinate, and the first transfer function can be obtained by fitting data of a computer.
And S17, placing the earphone to be tested under a second standard test condition to obtain the actual sensitivity of the current test frequency.
S18, inputting the current test frequency into the first transfer function, so as to obtain a sensitivity difference average corresponding to the current test frequency.
And S19, calculating the sum of the actual sensitivity and the average value of the sensitivity difference corresponding to the current test frequency to obtain the standard test sensitivity.
And S20, according to the EQ compensation parameters of the earphone to be tested with the standard sensitivity extreme.
By adopting the mode, the difference between the first standard test condition and the second standard test condition is embodied based on the difference, so that the whole data processing amount is small, the data processing efficiency is high, and the test efficiency of the earphone is improved.
Referring to fig. 3, another specific way of constructing the transfer function is shown, which includes the following steps:
and S21, placing the earphone samples with the step performance difference under the first standard test condition to obtain the first sensitivity of the earphone samples under the set test frequency. The selection of earphone samples also preferably covers a plurality of performance levels and selects a plurality of earphone samples in each performance level.
And S22, placing the selected earphone samples under second standard test conditions to obtain second sensitivity of a plurality of earphone samples under the set test frequency.
And S23, fitting the plurality of first sensitivities and the second sensitivities to establish a second transfer function. In the second transfer function, the second sensitivity is an input variable and the first sensitivity is an output variable.
In the modeling process of the second transfer function, a plurality of points on the plane can be obtained by taking the second sensitivity as an abscissa and the first sensitivity as an ordinate, and the second transfer function can be obtained by fitting data of a computer.
And S24, placing the earphone to be tested under a second standard test condition to obtain the actual sensitivity corresponding to the set test frequency.
And S25, acquiring standard sensitivity corresponding to the actual sensitivity according to the second transfer function. The actual sensitivity is used as an input variable of the second transfer function, namely, the standard sensitivity of the simulated real wearing environment can be output through the second transfer function.
And S26, calculating EQ compensation parameters of the earphone to be tested according to the standard sensitivity.
In the invention, the test signal changes the set test frequency within the rated frequency range of the earphone to be tested. Preferably, therefore, the nominal frequency is divided into a plurality of set test frequency bands, at least one set test frequency being provided in each set test frequency band. And fitting and establishing a second transfer function for each set testing frequency, calling the corresponding second transfer function according to the frequency band of the current testing frequency of the earphone to be tested, and acquiring the standard sensitivity corresponding to the actual sensitivity according to the called second transfer function.
By adopting the mode, the difference between the first standard test condition and the second standard test condition is realized based on the one-to-one correspondence of the first sensitivity and the second sensitivity, so that the data accuracy is higher and the precision is better.
The earphone testing method disclosed by the invention is particularly suitable for a semi-in-ear earphone, an earphone sample of the semi-in-ear earphone or a semi-in-ear earphone to be tested is provided with a shell, the shell is designed to have a non-standard geometric modeling edge, and when the earphone sample is placed under a first standard testing condition, the shell of the earphone sample extends into a testing jig.
The invention also discloses an earphone, which adopts the testing method disclosed by any one of the above embodiments to carry out testing before delivery or in other process flows, and carries out EQ compensation on an earphone product based on the testing result. Please refer to the detailed description of the above embodiments, which is not repeated herein, and the earphone tested by the above test method can achieve the same technical effect.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the above-described units or modules is only one type of division of logical functions, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be an electrical or other form.
The units described as the separate components may or may not be physically separate, and the components displayed as the units may or may not be physical units, that is, may be located in one physical space, or may also be distributed on a plurality of network units, and some or all of the units may be selected according to actual needs to achieve the purpose of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (9)
1. An earphone testing method is characterized by comprising the following steps:
placing the earphone sample under a first standard test condition to obtain a first test parameter;
placing the earphone sample under a second standard test condition to obtain a second test parameter;
obtaining a transfer function according to the first test parameter and the second test parameter;
placing the earphone to be tested under a second standard test condition to obtain performance test parameters of the earphone to be tested;
correcting the performance test parameters according to the transfer function to obtain standard test parameters of the earphone to be tested;
calculating EQ compensation parameters of the earphone to be tested according to the standard test parameters;
under a first standard test condition, the earphone sample extends into a test fixture, and the test fixture is provided with a standard microphone or an ear simulator; and under the second standard test condition, the earphone sample or the earphone to be tested and the standard microphone are arranged at intervals.
2. The headphone testing method of claim 1, further comprising the steps of:
selecting at least two earphone samples with step performance difference;
respectively placing the earphone samples under a first standard test condition to obtain a first sensitivity of each earphone sample under a set test frequency;
respectively placing the earphone samples under a second standard test condition to obtain a second sensitivity of each earphone sample under a set test frequency;
calculating a sensitivity difference between the first sensitivity and the second sensitivity for each earphone sample;
calculating the average value of the sensitivity difference values of a plurality of earphone samples to obtain the average value of the sensitivity difference values;
establishing a first transfer function according to a sensitivity difference mean value obtained under a plurality of set test frequencies and the set test frequencies, wherein in the first transfer function, the test frequency is an input variable, and the sensitivity difference mean value is an output variable;
placing the earphone to be tested under a second standard test condition to obtain the actual sensitivity of the current test frequency;
acquiring a sensitivity difference mean value corresponding to the current test frequency according to the first transfer function;
calculating the sum of the actual sensitivity and the sensitivity difference mean value corresponding to the current test frequency to obtain a standard test sensitivity;
and calculating EQ compensation parameters of the earphone to be tested according to the standard test sensitivity.
3. The headphone testing method according to claim 2,
selecting three groups of earphone samples with step performance difference, and respectively corresponding to a first sample grade, a second sample grade and a third sample grade; the acoustic performance of the first sample grade, the acoustic performance of the second sample grade and the acoustic performance of the third sample grade are sequentially decreased, and the second sample grade corresponds to the acoustic performance of a standard product.
4. The headphone testing method of claim 1, further comprising the steps of:
placing a plurality of earphone samples with step performance difference under a first standard test condition to obtain first sensitivity of the plurality of earphone samples under a set test frequency;
placing the earphone samples under a second standard test condition to obtain a second sensitivity of a plurality of earphone samples under a set test frequency;
fitting a plurality of first sensitivities and second sensitivities to establish a second transfer function, wherein in the second transfer function, the second sensitivities are input variables, and the first sensitivities are output variables;
placing the earphone to be tested under a second standard test condition to obtain actual sensitivity corresponding to the set test frequency;
acquiring standard sensitivity corresponding to the actual sensitivity according to the second transfer function;
and calculating the EQ compensation parameters of the earphone to be tested according to the standard sensitivity.
5. The earphone testing method according to claim 4,
the device comprises a plurality of set test frequency bands in rated frequency, wherein each set test frequency band is provided with at least one set test frequency;
fitting and establishing a second transfer function aiming at each set test frequency;
and calling a corresponding second transfer function according to the frequency band of the current test frequency, and acquiring standard sensitivity corresponding to the actual sensitivity according to the second transfer function.
6. The earphone testing method according to any one of claims 2 to 5,
the test signals under the first standard test condition and the second standard test condition are sinusoidal signals with the same variable frequency.
7. The earphone testing method according to claim 6,
the earphone sample and the earphone to be tested are half-in-ear earphones.
8. The earphone testing method according to claim 7,
when the earphone sample is placed under the first standard test condition, the shell of the earphone sample extends into the test fixture.
9. The headphone testing method of claim 8,
and when the earphone sample or the earphone to be tested is placed under the second standard test condition, the shell of the earphone sample or the earphone to be tested is opposite to the standard microphone.
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| CN201910815274.9A CN110557711B (en) | 2019-08-30 | 2019-08-30 | Earphone testing method and earphone |
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| CN201910815274.9A CN110557711B (en) | 2019-08-30 | 2019-08-30 | Earphone testing method and earphone |
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| CN112566002B (en) * | 2020-12-22 | 2022-02-18 | 歌尔光学科技有限公司 | Earphone consistency test method and test system |
| CN113382349B (en) * | 2021-06-30 | 2022-10-25 | 歌尔科技有限公司 | Calibration method and device of test device and computer readable storage medium |
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