CN110398338B - Method and system for obtaining wind noise speech intelligibility contribution in wind tunnel test - Google Patents
Method and system for obtaining wind noise speech intelligibility contribution in wind tunnel test Download PDFInfo
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Abstract
本发明提供一种在风洞试验中获得风噪语音清晰度贡献量的方法，包括步骤：步骤一，在风洞条件下测试汽车的风噪试验中，基于开窗法确定多个测试状态，并按顺序获得每一测试状态下以及初始测试的车内声压级，语音清晰度；步骤二，根据每一测试状态下的车内声压级，获得每一测试状态所对应的影响部件所泄露的声能量；步骤三，根据每一测试状态所对应的影响部件所泄露的声能量，以及初始测试状态的声压级，获得对初始测试状态施加当前影响部件后对应的声压级；步骤四，根据步骤三计算获得所述测试状态的语音清晰度；步骤五，根据每一测试状态的语音清晰度以及初始测试状态的语音清晰度获得每一测试状态下的语音清晰度的贡献量。本发明还提供了相应的系统。实施本发明，可以获得更加准确的声压级改善量与语音清晰度改善量信息，且成本更低。
The invention provides a method for obtaining the contribution of wind noise speech intelligibility in a wind tunnel test, comprising the steps of: step 1, in a wind noise test of a vehicle under wind tunnel conditions, determining a plurality of test states based on a window opening method; And in order to obtain the in-vehicle sound pressure level and voice intelligibility in each test state and the initial test; step 2, according to the in-vehicle sound pressure level in each test state, obtain the affected components corresponding to each test state. Leaked sound energy; step 3, according to the sound energy leaked by the influence component corresponding to each test state, and the sound pressure level of the initial test state, obtain the sound pressure level corresponding to the current influence component applied to the initial test state; step Fourth, calculate and obtain the speech intelligibility of the test state according to step 3; and step 5, obtain the contribution of speech intelligibility in each test state according to the speech intelligibility of each test state and the speech intelligibility of the initial test state. The present invention also provides a corresponding system. By implementing the present invention, more accurate sound pressure level improvement amount and speech intelligibility improvement amount information can be obtained, and the cost is lower.
Description
Technical Field
The invention relates to the field of wind noise measurement and analysis of automobiles, in particular to a method and a system for obtaining wind noise voice definition contribution in a wind tunnel test.
Background
Wind Noise, which is a key indicator of Noise, Vibration and Harshness (NVH) performance, is a major source of Noise in vehicles running at high speed and a major quality problem complained by consumers. Wind noise is mainly developed by means of simulation and wind tunnel assistance in the early stage, and is adjusted through tests in the later stage. How to quickly and effectively evaluate the contribution of a scheme to noise and speech definition in a vehicle is necessary.
The wind noise research of a target vehicle and a vehicle under study is usually carried out in the center of a wind tunnel by an automobile main engine plant so as to research the influence of the whole vehicle model, the local model, the bottom guard plate, the sound insulation glass and the gap on the outer surface of the sealed vehicle on the sound pressure level and the voice definition in the vehicle.
However, in the prior art, due to the restriction of time and cost factors, the wind noise test does not verify each measure independently; generally, a window opening method is adopted for verifying the influence of a certain measure, namely, the change quantity of the sound pressure level and the voice definition in a vehicle is tested when only a certain measure is changed. The noise improvement amount obtained at this time is a relative improvement amount based on the previous state, and is not a true improvement amount thereof.
Suppose a certain vehicle is tested according to the test sequence of table 1, and the sound pressure level and the speech intelligibility corresponding to each state are obtained through calculation.
TABLE 1
In one example, where the sound pressure level for each test state is shown in FIG. 1, where the abscissa represents the frequency range and the ordinate represents the value of the sound pressure level; in the figure, the frequency-sound pressure level curves corresponding to the states 1 to 11 are shown from bottom to top.
As shown in fig. 2, a histogram showing the speech intelligibility in each test state in this example is shown.
In this case, the contribution to sound pressure level Δ SPL of the ith scheme is calculated if necessaryiAnd a speech intelligibility contribution Δ AIiIn general, the following calculation formula is adopted:
ΔSPLi＝SPLi-SPLi-1 (1)
ΔAIi＝AIi-1-AIi (2)
Disclosure of Invention
The invention provides a wind noise improvement amount calculation method based on energy leakage, which can obtain more accurate sound pressure level improvement amount and voice definition improvement amount information and has lower cost.
In order to solve the technical problem, the invention provides a method for obtaining wind noise speech definition contribution in a wind tunnel test, which comprises the following steps:
step one, in a wind noise test of testing an automobile under a wind tunnel condition, determining a plurality of test states based on a windowing method, wherein each test state is different from the previous test state by at least one influence component, and sequentially obtaining the sound pressure level in the automobile in each test state and the initial test;
step two, obtaining the sound energy leaked by the influence component corresponding to each test state according to the sound pressure level in the vehicle under each test state;
step three, obtaining the sound pressure level corresponding to the initial test state after the current influence component is applied to the initial test state in each test state according to the sound energy leaked by the influence component corresponding to each test state and the sound pressure level of the initial test state;
step four, calculating and obtaining the voice definition of each test state according to the sound pressure level obtained by the calculation in the step three;
and step five, obtaining the contribution of the voice definition in each test state according to the voice definition in each test state and the voice definition in the initial test state.
Preferably, the second step is specifically:
calculating the acoustic energy of the leakage corresponding to each test state according to a formula I:
wherein, Δ SPLiIs the acoustic energy leakage dB value, P, in the ith test statepreTo listen to the valve sound pressure, Ppre＝20·10-6Pa，SPLiFor the sound pressure level, SPL, in the ith test conditioni-1The sound pressure level at the i-1 st test state.
Preferably, the third step is specifically:
and calculating the sound pressure level contribution of the current test state to the initial test state according to the leaked sound energy corresponding to each test state according to a formula II:
wherein, SPLoriIs the sound pressure level of the initial test state.
Preferably, the step five specifically includes:
and calculating and obtaining the contribution amount delta AI of the speech intelligibility in each test state according to the following formula III:
ΔAI＝AI-AIori(III)
Wherein AI is the speech intelligibility of the current test state, AIoriIs the speech intelligibility of the initial test state.
Preferably, the method further comprises the step of obtaining the contribution amount of speech intelligibility corresponding to a plurality of test states, including:
step six, according to the leaked sound energy corresponding to the plurality of test states, calculating the aggregate sound pressure level contribution amount of the plurality of test states corresponding to the component exerting corresponding influence on the initial test state according to the formula four:
wherein, Δ SPLiIs the acoustic energy leakage dB value in the ith test state, Delta SPLjThe value is the sound energy leakage dB in the jth test state;
step seven, calculating and obtaining the set voice definition corresponding to the plurality of test states according to the set sound pressure level contribution amount;
step eight, calculating and obtaining the contribution amount delta AI of the speech clarity corresponding to the plurality of test states according to the following formula five:
ΔAI＝AI-AIori(V)
Wherein the AI is the speech articulation corresponding to the plurality of test statesoriIs the speech intelligibility of the initial test state.
Accordingly, in another aspect of the embodiments of the present invention, a system for obtaining wind noise speech intelligibility contribution in a wind tunnel test is further provided, which includes:
the test data acquisition unit is used for determining a plurality of test states based on a windowing method in a wind noise test for testing the automobile under the wind tunnel condition, wherein each test state has a difference with the previous test state by at least one influence component, and the in-automobile sound pressure level of each test state and the in-automobile sound pressure level of the initial test are sequentially acquired;
the leaked sound energy obtaining unit is used for obtaining the sound energy leaked by the influence component corresponding to each test state according to the sound pressure level in the vehicle under each test state;
a sound pressure level contribution obtaining unit, configured to obtain, according to the sound energy leaked by the impact component corresponding to each test state and the sound pressure level of the initial test state, a sound pressure level corresponding to the initial test state after the current impact component is applied to the initial test state in each test state;
the voice definition calculating unit is used for calculating and obtaining the voice definition of each test state according to the result of the sound pressure level contribution obtaining unit;
and the voice definition contribution quantity obtaining unit is used for obtaining the contribution quantity of the voice definition in each test state according to the voice definition in each test state and the voice definition in the initial test state.
Preferably, the leaked acoustic energy obtaining unit specifically calculates the leaked acoustic energy corresponding to each test state according to a formula one:
wherein, Δ SPLiIs the acoustic energy leakage dB value, P, in the ith test statepreTo listen to the valve sound pressure, Ppre＝20·10-6Pa，SPLiFor the sound pressure level, SPL, in the ith test conditioni-1The sound pressure level at the i-1 st test state.
Preferably, the sound pressure level contribution amount obtaining unit specifically calculates the sound pressure level contribution amount of the current test state to the initial test state according to the leaked sound energy corresponding to each test state as formula two:
wherein, SPLoriIs the sound pressure level of the initial test state.
Preferably, the speech intelligibility contribution amount obtaining unit obtains the speech intelligibility contribution amount Δ AI in each test state by specifically calculating according to the following formula three:
ΔAI＝AI-AIori(III)
Wherein AI is the speech intelligibility of the current test state, AIoriIn the initial test stateSpeech intelligibility of the states.
Preferably, further comprising:
and the aggregate sound pressure level contribution quantity obtaining unit is used for calculating the aggregate sound pressure level contribution quantities of the plurality of test states corresponding to the parts exerting corresponding influences on the initial test state according to the leaked sound energy corresponding to the plurality of test states according to the formula IV:
wherein, Δ SPLiIs the acoustic energy leakage dB value in the ith test state, Delta SPLjThe value is the sound energy leakage dB in the jth test state;
the integrated voice definition calculating unit calculates and obtains integrated voice definitions corresponding to the plurality of test states according to the integrated sound pressure level contribution;
and the aggregate speech definition contribution amount obtaining unit is used for calculating and obtaining the contribution amount delta AI of the speech definitions corresponding to the plurality of test states according to the following formula five:
ΔAI＝AI-AIori(V)
Wherein the AI is the speech articulation corresponding to the plurality of test statesoriIs the speech intelligibility of the initial test state.
The implementation of the invention has the following beneficial effects:
the invention provides a method and a system for calculating wind noise and voice definition contribution in a wind tunnel test. In the embodiment of the invention, the wind noise improvement quantity calculation method based on energy leakage does not depend on a test sequence, and the sound pressure level improvement quantity and the voice definition improvement quantity obtained by calculation are absolute values, so that more accurate data support can be provided for an engineer to make a decision;
in the embodiment of the invention, in the wind tunnel test, the sound pressure level improvement amount and the voice definition improvement amount corresponding to each test state can be obtained only by adopting a windowing method, the time and the cost of the wind tunnel test can be saved, and the obtained data is more accurate and visual.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a graph showing a frequency-sound pressure level curve corresponding to each test state in a wind tunnel test;
FIG. 2 is a block diagram illustrating speech intelligibility corresponding to each test state in a wind tunnel test according to the prior art;
FIG. 3 is a schematic flow chart illustrating an embodiment of a method for obtaining wind noise speech intelligibility contribution in a wind tunnel test according to the present invention;
fig. 4 is a schematic structural diagram illustrating an embodiment of a system for obtaining a wind noise speech intelligibility contribution in a wind tunnel test according to the present invention.
Detailed Description
Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.
Fig. 3 is a schematic main flow chart illustrating an embodiment of a method for obtaining a wind noise speech intelligibility contribution in a wind tunnel test according to the present invention. In this embodiment, the method comprises the steps of:
step S10, in a wind noise test of testing the automobile under the wind tunnel condition, determining a plurality of test states based on a windowing method, wherein each test state is different from the previous test state by at least one influence component, and sequentially obtaining the sound pressure level in each test state and the sound pressure level in the automobile in the initial test;
for example, in one example, a plurality of test states (e.g., 11) may be determined, where test state 1 is fully sealed (this state we refer to as the initial test state); state 2 is to remove the seal of the a column, wherein the seal of the a column is the influencing component; state 3 is further removing the seal of the outer rear view mirror, which is the influencing component; state 4 is further removing the seal of the glass run channel, which is the influencing component; state 5 is further removing the seal around the vehicle door, which is the influencing component; and so on, the last state being the removal of all seals. It will be understood that, where the in-vehicle sound pressure level is a value on a different frequency characteristic corresponding to aerodynamic noise, the frequency range may be, for example, 200hz to 6300hz, i.e. for each test condition there will be a sound pressure level for each frequency, how to calculate or obtain the value of the sound pressure level is prior art in the field and will not be described in detail herein; meanwhile, how to calculate the speech intelligibility according to the sound pressure level may refer to the description of "noise and vibration of automobiles-theory and application", the university press of beijing physiologists, 1 st edition, 2006, page 389, which is not described in detail herein.
Step S11, obtaining the sound energy leaked by the influence component corresponding to each test state according to the sound pressure level in the vehicle under each test state;
specifically, in an example, the step S11 specifically includes:
calculating the acoustic energy of the leakage corresponding to each test state according to a formula I:
wherein, Δ SPLiIs the acoustic energy leakage dB value, P, in the ith test statepreTo listen to the valve sound pressure, Ppre＝20·10-6Pa，SPLiFor the sound pressure level, SPL, in the ith test conditioni-1The sound pressure level at the i-1 st test state. Can be understoodIn the step, based on each test state, the leaked acoustic energy affecting the component is fixed and does not change along with the test sequence;
step S12, obtaining the sound pressure level corresponding to the current influencing component applied to the initial test state according to the sound energy leaked by the influencing component corresponding to each test state and the sound pressure level of the initial test state;
specifically, in an example, the step S12 specifically includes:
and calculating the sound pressure level contribution of the current test state to the initial test state according to the leaked sound energy corresponding to each test state according to a formula II:
wherein, SPLoriIs the sound pressure level of the initial test state.
Step S13, calculating and obtaining the speech definition of the test state according to the step S12;
specifically, in one example, the speech intelligibility AI may be calculated by:
AI ═ Σ DF weighting/30
Where DF is the difference between the upper limit noise and the sound pressure level contribution in step S13, that is, DF is equal to the upper limit-SPL, where if DF is less than 0, DF is equal to 0; if DF >30, DF is 30;
weighting is a weighting coefficient considering the speaking voice and the auditory frequency characteristics of human ears;
more specifically, the description of "noise and vibration-theory and application of automobiles", Beijing university of Physician, 6.2006, 1 st edition, page 389, will not be described in detail herein.
Table two below lists the relationship between the speech intelligibility AI and the sound pressure level contribution SPL in one embodiment;
watch two
In this example, AI is the sum of the speech intelligibility in bandwidth, i.e., AI is 71.8.
It is understood that in step S10, the speech intelligibility corresponding to the initial test state is calculated in a similar manner, and will not be described in detail herein.
Step S14, obtaining the contribution amount of the speech intelligibility in each test state according to the speech intelligibility in each test state and the speech intelligibility in the initial test state.
Specifically, in an example, the step S14 specifically includes:
and calculating and obtaining the contribution amount delta AI of the speech intelligibility in each test state according to the following formula III:
ΔAI＝AI-AIori(III)
Wherein AI is the speech intelligibility of the current test state, AIoriIs the speech intelligibility of the initial test state.
It can be understood that, in the present invention, the contribution amount of the set speech intelligibility corresponding to a plurality of test states may also be calculated.
Specifically, in an embodiment of the present invention, the method further includes a step of obtaining a contribution amount of speech intelligibility corresponding to a plurality of test states, including:
step S15, according to the leaked sound energy corresponding to the multiple test states, calculating the aggregate sound pressure level contribution amount corresponding to the component with the corresponding influence on the initial test state according to the formula four:
wherein, Δ SPLiIs the acoustic energy leakage dB value in the ith test state, Delta SPLjThe value is the sound energy leakage dB in the jth test state;
step S16, calculating and obtaining the set voice definition corresponding to the plurality of test states according to the set sound pressure level contribution amount;
step S17, calculating and obtaining the contribution Δ AI of the speech intelligibility corresponding to the plurality of test states according to the following formula five:
ΔAI＝AI-AIori(V)
Wherein the AI is the speech articulation corresponding to the plurality of test statesoriFor the speech intelligibility of the initial test state, it can be understood that the speech intelligibility minus the speech intelligibility of the initial state at this time is the real improvement amount of the test state (scheme) to the initial test state, and does not change with the test sequence.
Accordingly, as shown in fig. 4, a schematic structural diagram of an embodiment of the system for obtaining wind noise speech intelligibility contribution in a wind tunnel test according to the present invention is shown. In this embodiment, the system 1 for obtaining the wind noise speech intelligibility contribution in the wind tunnel test comprises:
the test data obtaining unit 10 is used for determining a plurality of test states based on a windowing method in a wind noise test for testing the automobile under the wind tunnel condition, wherein each test state has a difference with the previous test state by at least one influence component, and the in-vehicle sound pressure level and the voice definition of each test state and the initial test are obtained in sequence;
the leaked sound energy obtaining unit 11 is configured to obtain, according to the sound pressure level in the vehicle at each test state, the sound energy leaked by the influence component corresponding to each test state; specifically, in an example, the leaked acoustic energy obtaining unit 11 calculates the leaked acoustic energy corresponding to each test state according to formula one:
wherein, Δ SPLiIs the acoustic energy leakage dB value, P, in the ith test statepreTo listen to the valve sound pressure, Ppre＝20·10-6Pa，SPLiFor the sound pressure level, SPL, in the ith test conditioni-1Under the i-1 th test conditionA sound pressure level; it will be appreciated that the above-described,
a sound pressure level contribution obtaining unit 12, configured to obtain, according to the sound energy leaked by the impact component corresponding to each test state and the sound pressure level of the initial test state, a sound pressure level corresponding to the current impact component applied to the initial test state; specifically, in an example, the sound pressure level contribution obtaining unit 11 specifically calculates the sound pressure level contribution of the current test state to the initial test state according to the acoustic energy of the leakage corresponding to each test state as shown in formula two:
wherein, SPLoriSound pressure level at initial test state;
a voice definition calculating unit 13, configured to calculate and obtain the voice definition of each test state according to the result of the sound pressure level contribution obtaining unit;
a speech intelligibility contribution obtaining unit 14, for obtaining the contribution of the speech intelligibility in each test state according to the speech intelligibility in each test state and the speech intelligibility in the initial test state; specifically, in an example, the speech intelligibility contribution obtaining unit 14 obtains the contribution Δ AI of speech intelligibility in each test state by calculating according to the following formula three:
ΔAI＝AI-AIori(III)
Wherein AI is the speech intelligibility of the current test state, AIoriIs the speech intelligibility of the initial test state.
In other embodiments of the present invention, the system 1 further comprises:
and the aggregate sound pressure level contribution quantity obtaining unit is used for calculating the aggregate sound pressure level contribution quantities of the plurality of test states corresponding to the parts exerting corresponding influences on the initial test state according to the leaked sound energy corresponding to the plurality of test states according to the formula IV:
wherein, Δ SPLiIs the acoustic energy leakage dB value in the ith test state, Delta SPLjThe value is the sound energy leakage dB in the jth test state;
the integrated voice definition calculating unit calculates and obtains integrated voice definitions corresponding to the plurality of test states according to the integrated sound pressure level contribution;
and the aggregate speech definition contribution amount obtaining unit is used for calculating and obtaining the contribution amount delta AI of the speech definitions corresponding to the plurality of test states according to the following formula five:
ΔAI＝AI-AIori(V)
Wherein the AI is the speech articulation corresponding to the plurality of test statesoriIs the speech intelligibility of the initial test state.
For more details, reference may be made to the above description of fig. 3, which is not detailed here.
The embodiment of the invention has the following beneficial effects:
the invention provides a method and a system for calculating wind noise and voice definition contribution in a wind tunnel test. In the embodiment of the invention, the wind noise improvement quantity calculation method based on energy leakage does not depend on a test sequence, and the sound pressure level improvement quantity and the voice definition improvement quantity obtained by calculation are absolute values, so that more accurate data support can be provided for an engineer to make a decision;
in the embodiment of the invention, in the wind tunnel test, the sound pressure level improvement amount and the voice definition improvement amount corresponding to each test state can be obtained only by adopting a windowing method, the time and the cost of the wind tunnel test can be saved (for example, approximately half of the time and the cost can be saved compared with the prior art), and the obtained data is more accurate and visual.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.
Claims (10)
1. A method for obtaining wind noise speech intelligibility contribution in a wind tunnel test is characterized by comprising the following steps:
step one, in a wind noise test of testing an automobile under a wind tunnel condition, determining a plurality of test states based on a windowing method, wherein each test state is different from the previous test state by at least one influence component, and sequentially obtaining the sound pressure level in the automobile in each test state and the initial test state;
step two, obtaining the sound energy leaked by the influence component corresponding to each test state according to the sound pressure level in the vehicle under each test state;
step three, obtaining the sound pressure level corresponding to the initial test state after the current influence component is applied to the initial test state in each test state according to the sound energy leaked by the influence component corresponding to each test state and the sound pressure level of the initial test state;
step four, calculating according to the sound pressure level corresponding to the initial test state after the current influence component is applied to the initial test state in each test state to obtain the voice definition of each test state;
and step five, obtaining the contribution of the voice definition in each test state according to the voice definition in each test state and the voice definition in the initial test state.
2. The method according to claim 1, wherein the second step is specifically:
calculating the acoustic energy of the leakage corresponding to each test state according to a formula I:
wherein, Δ SPLiIs the acoustic energy leakage dB value, P, in the ith test statepreTo listen to the valve sound pressure, Ppre＝20·10- 6Pa，SPLiFor the sound pressure level, SPL, in the ith test conditioni-1The sound pressure level at the i-1 st test state.
3. The method according to claim 2, wherein the third step is specifically:
and calculating the sound pressure level corresponding to the initial test state after the current influence component is applied according to the leaked sound energy corresponding to each test state and the formula II:
wherein, SPLoriIs the sound pressure level of the initial test state.
4. The method according to claim 3, wherein the step five is specifically:
and calculating and obtaining the contribution amount delta AI of the speech intelligibility in each test state according to the following formula III:
ΔAI＝AI-AIori(III)
Wherein AI is the speech intelligibility of the current test state, AIoriIs the speech intelligibility of the initial test state.
5. The method of any of claims 2 to 4, further comprising the step of obtaining a contribution to speech intelligibility for a plurality of test states, comprising:
step six, according to the leaked sound energy corresponding to the plurality of test states, calculating the aggregate sound pressure level contribution amount of the plurality of test states corresponding to the component exerting corresponding influence on the initial test state according to the formula four:
wherein, Δ SPLiIs the acoustic energy leakage dB value in the ith test state, Delta SPLjThe value is the sound energy leakage dB in the jth test state;
step seven, calculating and obtaining the set voice definition corresponding to the plurality of test states according to the set sound pressure level contribution amount;
step eight, calculating and obtaining the contribution amount delta AI of the speech clarity corresponding to the plurality of test states according to the following formula five:
ΔAI＝AI-AIori(V)
Wherein the AI is the speech articulation corresponding to the plurality of test statesoriIs the speech intelligibility of the initial test state.
6. A system for obtaining a wind noise speech intelligibility contribution in a wind tunnel test, comprising:
the test data acquisition unit is used for determining a plurality of test states based on a windowing method in a wind noise test for testing the automobile under the wind tunnel condition, wherein each test state has a difference with the previous test state by at least one influence component, and the in-automobile sound pressure level of each test state and the in-automobile sound pressure level of the initial test are sequentially acquired;
the leaked sound energy obtaining unit is used for obtaining the sound energy leaked by the influence component corresponding to each test state according to the sound pressure level in the vehicle under each test state;
a sound pressure level contribution obtaining unit, configured to obtain, according to the sound energy leaked by the impact component corresponding to each test state and the sound pressure level of the initial test state, a sound pressure level corresponding to the initial test state after the current impact component is applied to the initial test state in each test state;
the voice definition calculating unit is used for calculating and obtaining the voice definition of each test state according to the result of the sound pressure level contribution obtaining unit;
and the voice definition contribution quantity obtaining unit is used for obtaining the contribution quantity of the voice definition in each test state according to the voice definition in each test state and the voice definition in the initial test state.
7. The system of claim 6, wherein the leaked acoustic energy deriving unit calculates the leaked acoustic energy for each test condition according to formula one:
wherein, Δ SPLiIs the acoustic energy leakage dB value, P, in the ith test statepreTo listen to the valve sound pressure, Ppre＝20·10- 6Pa，SPLiFor the sound pressure level, SPL, in the ith test conditioni-1The sound pressure level at the i-1 st test state.
8. The system of claim 7, wherein the sound pressure level contribution obtaining unit calculates the sound pressure level contribution of the current test state to the initial test state according to the leaked sound energy corresponding to each test state, as shown in formula two:
wherein, SPLoriIs the sound pressure level of the initial test state.
9. The system according to claim 8, wherein the speech intelligibility contribution amount obtaining unit obtains the contribution amount Δ AI of speech intelligibility in each test state by calculating according to the following formula three:
ΔAI＝AI-AIori(III)
Wherein AI is the speech intelligibility of the current test state, AIoriIs the speech intelligibility of the initial test state.
10. The system of any one of claims 7-9, further comprising:
and the aggregate sound pressure level contribution quantity obtaining unit is used for calculating the aggregate sound pressure level contribution quantities of the plurality of test states corresponding to the parts exerting corresponding influences on the initial test state according to the leaked sound energy corresponding to the plurality of test states according to the formula IV:
wherein, Δ SPLiIs the acoustic energy leakage dB value in the ith test state, Delta SPLjThe value is the sound energy leakage dB in the jth test state;
the integrated voice definition calculating unit calculates and obtains integrated voice definitions corresponding to the plurality of test states according to the integrated sound pressure level contribution;
and the aggregate speech definition contribution amount obtaining unit is used for calculating and obtaining the contribution amount delta AI of the speech definitions corresponding to the plurality of test states according to the following formula five:
ΔAI＝AI-AIori(V)
Wherein the AI is the speech articulation corresponding to the plurality of test statesoriIs the speech intelligibility of the initial test state.
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