A detection and debugging method for an electroacoustic system in a cockpit

Abstract

The invention relates to a detection and debugging method for an electroacoustic system in a cockpit, which comprises detection of frequency response of a sound field in the cabin, detection of odd-even distortion of the sound field in the cabin, detection of equal sound pressure levels of different loudspeakers in the cabin, and detection of maximum loudness in the cabin and difference between left and right ear loudness. The method has the advantages of detecting and debugging a plurality of parameters in the cabin through four detection and debugging methods so that each parameter of the cabin is debugged into a set appropriate range, and can well unify the quality parameter index of the electroacoustic system in the cabin, improve the comfort of the acoustic environment in the cabin, standardize the production in the market, and thus avoid the phenomenon that the quality of the cabins flowing into the market is uneven and it is impossible to judge their quality.

Description

Technical Field

[0001] The invention relates to a detection and debugging method for an electroacoustic system in a cockpit. Background Art

[0002] The acoustic environment in a cockpit with an electroacoustic system directly affects the comfort of the users and is a key factor in ensuring or even improving the market competitiveness of the cockpit industry. However, there is no standardized method to test and evaluate the parameters of the electroacoustic system in the cockpit. The market only tests the sound insulation of the cockpit, and there is no corresponding indicator to characterize the quality of the acoustic environment in the cockpit with an electroacoustic system. Therefore, the content of this invention is to solve the above problems. Summary of the invention

[0003] The purpose of the present invention is to provide a detection and debugging method for an electroacoustic system in a cockpit, which solves the problem of testing the performance parameters of the electroacoustic system in the cockpit.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is:

[0005] The present invention provides a method for detecting and debugging an electroacoustic system in a cockpit, which comprises:

[0006] S1, detection and debugging of cabin sound field frequency response:

[0007] S11, first test the frequency response of the rated frequency sweep signal of each speaker in the cabin at the factory through a data analyzer; that is, open multiple speaker channels in the cabin in turn, collect signals through acquisition equipment, and test the frequency response of the cabin sound field of each speaker through a data analyzer, so that the frequency response of the rated frequency range of each speaker is within ±15dB; if the requirements are not met, debug until the requirements are met;

[0008] S12, then test the frequency response of the swept frequency signal of the rated frequency range of the total loudspeaker at the factory through the data analyzer; that is, open all the loudspeaker channels in the cockpit at the same time, collect signals through the acquisition equipment and test the frequency response of the cabin sound field of the total loudspeaker through the data analyzer, so that the frequency response of the rated frequency range of the total loudspeaker is within ±20dB; if the requirements are not met, debug until the requirements are met;

[0009] S2, detection and debugging of even and odd distortion of cabin sound field:

[0010] S21, turn on multiple speaker channels in the cabin for testing in sequence, use acquisition equipment to record the even harmonic components (2nd, 4th, 6th... harmonics) and odd harmonic components (3rd, 5th, 7th... harmonics) of the frequency sweep signal of each speaker, and use formula 1 to calculate and determine that the total distortion of odd and even harmonics in the test frequency band of each speaker is ≤10%. If the requirement is not met, debug until the requirement is met;

[0011] (Formula 1)

[0012] Where Pt: total sound pressure including fundamental frequency,

[0013] Pnf: sound pressure of the nth harmonic component of the fundamental frequency;

[0014] S22, after the total distortion of odd and even harmonics in the test frequency band of each speaker in S21 meets the requirement, the sound field of the total speakers in the cabin is detected, and the speaker channels in the cabin are opened at the same time for distortion detection. The final result is calculated according to Formula 1 in S21, and the total distortion of odd and even harmonics in the test frequency band must be ≤10%. If the requirement is not met, debugging is performed until the requirement is met;

[0015] S3, detection and debugging of equal sound pressure levels of different speakers in the cabin:

[0016] Use a data analyzer to output pink noise and set the pink noise peak factor. Open the cabin speaker channels one by one for testing, and use the acquisition equipment to record the sound pressure level of each speaker. The maximum sound pressure level difference between all channels of the cabin speaker must be ≤2dB. If the requirement is not met, debug it;

[0017] S4, detection of the maximum loudness in the cabin and the difference between the loudness of the left and right ears:

[0018] The acquisition device uses an artificial head, and uses the data analyzer to output pink noise, and sets the pink noise peak factor. The volume of the speaker in the cabin is turned to the maximum. At this time, the data analyzer is used to calculate the loudness of the left ear and the right ear of the artificial head, and the data calculation is performed:

[0019] The difference between left and right ear loudness = |left ear loudness - right ear loudness|, and its value must be ≤2.0 sone;

[0020] The maximum loudness in the cabin = (left ear loudness + right ear loudness) ÷ 2. The value must be ≥ 60.0sone. If it fails to meet the requirement, debugging is required.

[0021] Furthermore, in S11, if the frequency response of the speaker exceeds ±15dB, an equalizer is required to adjust the speaker frequency response to make its frequency response curve flatter. After the final equalization adjustment is completed, the maximum difference in frequency response between all speaker channels should not be greater than 10dB. If it is not satisfied, the amplitude controller can be used to adjust the two channel curves so that the whole curve moves up or down to meet the requirement.

[0022] Furthermore, in S12, if the frequency response of the total loudspeaker exceeds ±20 dB, two channels with larger deviations in a single test are selected, and an amplitude controller is used to adjust the curves of the two channels so that the overall curves move up or down, thereby making the frequency response within an allowable range.

[0023] Furthermore, if the total distortion of odd and even harmonics in the frequency bands of S21 and S22 fails to meet the requirements, a speaker with better performance may be replaced or the signal amplitude may be reduced for retesting until the requirements are met.

[0024] Furthermore, if the sound pressure level deviation in S3 is too large, the amplitude control knob in the cockpit electroacoustic system can be adjusted until the deviation is within the allowable range.

[0025] Furthermore, the peak factors of the pink noise in S3 and S4 are both set to between 1.8 and 2.2.

[0026] Furthermore, if the left ear loudness is too high and does not meet the requirement in S4, the amplitude controller of the speaker channel in the left ear direction may be adjusted to perform an equal amount of numerical attenuation and then retest until the requirement is met, and vice versa;

[0027] If the maximum loudness is not enough, use the controller in the adjustable cockpit electro-acoustic system to increase the gain of all channels by an equal amount and then retest to determine whether the maximum loudness requirement is met.

[0028] Furthermore, the artificial head detection angle in S4 may be 0° or 90°.

[0029] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0030] The detection and debugging method of the electroacoustic system in the cockpit of the present invention can detect and debug the frequency response of the sound field in the cabin, the odd and even distortion of the sound field, the equal sound pressure levels of different speakers, the maximum loudness in the cabin and the difference between the loudness of the left and right ears through the above detection and debugging method, so that each parameter of the cockpit is debugged to a set appropriate range, and the quality parameter indicators of the electroacoustic system in the cockpit can be well unified, the comfort of the acoustic environment in the cabin can be improved, and the production in the market can be standardized, thereby avoiding the phenomenon that the quality of the cockpits entering the market is uneven and it is impossible to judge their quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

[0032] Figure 1 is an overall block diagram of the detection hardware in the preferred embodiment of the present invention;

[0033] Figure 2 Schematic diagram of the artificial head at 0° in the present invention;

[0034] Figure 3 Schematic diagram of the artificial head at 90° in the present invention.

[0035] The reference numerals are described as follows:

[0036] 1. Cabin; 2. Speaker; 3. Collection equipment; 4. Data analyzer. DETAILED DESCRIPTION

[0037] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0039] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0040] refer to Figure 1 , a detection and debugging method for an electroacoustic system in a cabin provided by the present invention, through which some acoustic index parameters of the internal environment of the cabin can be detected and debugged to determine whether the debugging of the electroacoustic system in the cabin meets the corresponding requirements, and to avoid the circulation of unqualified debugged products in the market. The specific method is as follows, which includes:

[0041] S1, detection and debugging of cabin sound field frequency response:

[0042] S11, first test the frequency response of the rated frequency sweep signal of each speaker 2 in the cabin at the factory through the data analyzer 4; that is, open the multiple speaker 2 channels in the cabin 1 in turn, collect signals through the collection device 3 and test the cabin sound field frequency response of each speaker 2 through the data analyzer 4, so that the frequency response of each speaker 2 within the rated frequency range is within ±15dB. If the frequency response of the rated frequency range of the speaker 2 exceeds ±15dB, it is necessary to use an equalizer to adjust the frequency response of the speaker 2 to make its frequency response curve flatter. After the final equalization adjustment is completed, the maximum difference in the frequency response between all speaker 2 channels should not be greater than 10dB. If it is not satisfied, it can be adjusted by using an amplitude controller to make the curves of the two channels move up or down as a whole to meet the requirements; wherein, the collection device 3 is placed on the seat of the person, and its height is consistent with the height of the ears of the human body after sitting, which is generally 1.2m;

[0043] S12, when all the speakers 2 in S11 are balanced and adjusted and meet the requirements, the frequency response of the swept frequency signal of the rated frequency range of the total speakers 2 at the factory is tested by the data analyzer 4; that is, the total speaker 2 channels in the cabin 1 are opened at the same time, and the cabin sound field frequency response of the total speakers 2 is collected by the acquisition device 3 and tested by the data analyzer 4, so that the rated frequency range frequency response of the total speakers 2 is within ±20dB; if the frequency response of the total speakers 2 exceeds ±20dB, the two speaker 2 channels with larger deviations in a single test are selected, and the amplitude controller is used to adjust so that the curves of the two channels move up or down as a whole, so that the frequency response is within the allowable range.

[0044] S2, detection and debugging of even and odd distortion of cabin sound field:

[0045] S21, the positions of the hardware devices remain unchanged, the data analyzer 4 is connected to the signal end of the loudspeaker 2 in the cabin 1, and the swept frequency signal of the rated frequency range is output. The channels of multiple loudspeakers 2 in the cabin 1 are opened in turn for testing, and the acquisition device 3 is used to record the even harmonic components (2nd, 4th, 6th... harmonics) and odd harmonic components (3rd, 5th, 7th... harmonics) of the swept frequency signal of each loudspeaker 2. Formula 1 is used to calculate and determine whether the total distortion of odd and even harmonics in the test frequency band of each loudspeaker is ≤10%. If the requirement is not met, debugging is performed until the requirement is met;

[0046] (Formula 1)

[0047] Where Pt: total sound pressure including fundamental frequency,

[0048] Pnf: sound pressure of the nth harmonic component of the fundamental frequency;

[0049] S22, after the total distortion of odd and even harmonics in the test frequency band of each speaker 2 in S21 meets the requirement, the sound field of the total speaker 2 in the cabin 1 is detected, and the channels of the speaker 2 in the cabin 1 are opened simultaneously for distortion detection, and the final result is calculated according to Formula 1 in S21, wherein the input signal is continuously adjusted during the distortion detection process so that the total distortion of odd and even harmonics in the test frequency band is just ≤10%, and the amplitude of the input signal at this time is recorded as the maximum input voltage limited by the distortion;

[0050] Furthermore, when the total distortion of odd and even harmonics in the test frequency band of a single speaker or the total distortion of odd and even harmonics in the test frequency band of the total speaker fails to meet the requirements, a speaker with better performance can be replaced or the signal amplitude can be reduced for retesting until the requirements are met and the total distortion of odd and even harmonics in the test frequency band must be ≤10%.

[0051] S3, detection and debugging of equal sound pressure levels of different speakers in the cabin:

[0052] Use the data analyzer 4 to output pink noise and set the pink noise peak factor. The pink noise peak factor is set between 1.8 and 2.2. Open the speaker channels in the cabin 1 in turn for testing, and use the acquisition device 3 to record the sound pressure level of each speaker 2 respectively. The difference in the maximum sound pressure level between all channels of the cabin speakers must be ≤2dB. If the sound pressure level deviation is too large, the amplitude control knob in the cockpit electroacoustic system can be adjusted to within the allowable range.

[0053] S4, detection of the maximum loudness in the cabin and the difference between the loudness of the left and right ears:

[0054] The acquisition device uses an artificial head. The detection angle of the artificial head can be 0° or 90°. The test accuracy can be improved by testing at 0° or 90°. The data analyzer is used to output pink noise, where the peak factor of the pink noise is set between 1.8-2.2. The input voltage is the maximum input voltage of the distortion limit in S22. At this time, the data analyzer is used to calculate the loudness of the left and right ears of the artificial head, and the data calculation is performed:

[0055] The difference between left and right ear loudness = |left ear loudness - right ear loudness|, and its value must be ≤2.0 sone; if the left ear loudness is too loud and does not meet the requirement, the amplitude controller of the speaker channel in the left ear direction can be adjusted, and the value can be attenuated by the same amount and then retested until the requirement is met, otherwise the same is true;

[0056] The maximum loudness in the cabin = (left ear loudness + right ear loudness) ÷ 2, and the value must be ≥ 60.0sone. If it fails to meet the requirements, debugging should be carried out. If the maximum loudness is not enough, the controller in the adjustable cockpit electro-acoustic system can be used to increase the gain of all channels by the same amount, and then retest to determine whether the maximum loudness requirements are met.

[0057] After all the above tests are completed, the above work needs to be repeated until active debugging is no longer required.

[0058] In summary, the above-mentioned detection and debugging methods can be used to detect and debug the cabin sound field frequency response, sound field odd and even order distortion, equal sound pressure levels of different speakers, maximum loudness in the cabin and difference between left and right ear loudness, so that each parameter of the cockpit can be debugged to the set appropriate range. This can well unify the quality parameter indicators of the electroacoustic system in the cockpit, improve the comfort of the cabin acoustic environment, standardize production in the market, and avoid the phenomenon that the quality of cockpits entering the market is uneven and it is impossible to judge their quality.

[0059] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the contents of the present invention and implement them accordingly. They cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for detecting and debugging an electroacoustic system in a cockpit, characterized in that: It includes, S1, detection and debugging of cabin sound field frequency response: S11, first test the frequency response of the rated frequency sweep signal of each speaker in the cabin at the factory through a data analyzer; that is, open multiple speaker channels in the cabin in turn, collect signals through an acquisition device, and test the frequency response of the cabin sound field of each speaker through a data analyzer, so that the frequency response of the rated frequency range of each speaker is within ±15dB. If the frequency response of the speaker exceeds ±15dB, use an equalizer to adjust the speaker frequency response to make its frequency response curve flatter. After the final equalization adjustment is completed, the maximum difference in the frequency response of all speaker channels should not be greater than 10dB. If it does not meet the requirement, use an amplitude controller to adjust the curve of the two channels so that the overall upward or downward movement is achieved to meet the requirement; S12, then testing the frequency response of the swept frequency signal of the rated frequency range of the total loudspeaker when leaving the factory by using a data analyzer; That is, all the speaker channels in the cockpit are opened at the same time, the signals are collected by the acquisition equipment and the frequency response of the cabin sound field of the total speaker is tested by the data analyzer, so that the frequency response of the rated frequency range of the total speaker is within ±20dB. If the frequency response of the total speaker exceeds ±20dB, the two channels with larger deviations in the single test are selected, and the amplitude controller is used to adjust so that the curves of the two channels move up or down as a whole, so that the frequency response is within the allowable range; S2, detection and debugging of even and odd distortion of cabin sound field: S21, turn on multiple speaker channels in the cabin for testing in sequence, use acquisition equipment to record the even harmonic components and odd harmonic components of each speaker's frequency sweep signal, and use formula 1 to calculate and determine that the total distortion of odd and even harmonics in the test frequency band of each speaker is ≤10%; (Formula 1) Where Pt: total sound pressure including fundamental frequency, Pnf: sound pressure of the nth harmonic component of the fundamental frequency; S22, after the total distortion of odd and even harmonics in the test frequency band of each speaker in S21 meets the requirement, the sound field of the total speakers in the cabin is tested, and the speaker channels in the cabin are opened at the same time for distortion detection. The final result is calculated according to Formula 1 in S21, and the total distortion of odd and even harmonics in the test frequency band must be ≤10%; If the total distortion of odd and even harmonics in the mid-frequency bands of S21 and S22 fails to meet the requirements, replace the speaker with better performance or reduce the signal amplitude and retest until the requirements are met; S3, detection and debugging of equal sound pressure levels of different speakers in the cabin: Use a data analyzer to output pink noise and set the pink noise peak factor. Open the cabin speaker channels one by one for testing and use the acquisition equipment to record the sound pressure level of each speaker. The maximum sound pressure level difference between all channels of the cabin speaker must be ≤2dB. If the sound pressure level deviation is too large, adjust the amplitude control knob in the cabin electroacoustic system until the deviation is within the allowable range. S4, detection of the maximum loudness in the cabin and the difference between the loudness of the left and right ears: The acquisition device uses an artificial head, and uses the data analyzer to output pink noise, and sets the pink noise peak factor. The volume of the speaker in the cabin is turned to the maximum. At this time, the data analyzer is used to calculate the loudness of the left ear and the right ear of the artificial head, and the data calculation is performed: the difference between the left and right ear loudness = |left ear loudness - right ear loudness|, and the value must be ≤2.0 sone; Maximum loudness in the cabin = (left ear loudness + right ear loudness) ÷ 2, the value must be ≥ 60.0sone. If it fails to meet the requirement, debugging is required; If the left ear loudness is too high and does not meet the requirement in S4, the amplitude controller of the speaker channel in the left ear direction is adjusted, and the value is attenuated by the same amount and then retested until the requirement is met, and vice versa; If the maximum loudness in the cabin is not enough, use the controller in the adjustable cockpit electro-acoustic system to increase the gain of all channels by an equal amount, then retest to determine whether the maximum loudness requirement is met.

2. The method for detecting and debugging the electroacoustic system in the cockpit according to claim 1, characterized in that: The pink noise crest factors in S3 and S4 are both set to between 1.8 and 2.

2.

3. The detection and debugging method of the electroacoustic system in the cockpit according to claim 1, characterized in that: In the S4, the artificial head detection angle is 0° or 90°.

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