CN113674730B - Secondary sound source with fault detection function for active noise control system and fault detection method - Google Patents

Secondary sound source with fault detection function for active noise control system and fault detection method Download PDF

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CN113674730B
CN113674730B CN202110926783.6A CN202110926783A CN113674730B CN 113674730 B CN113674730 B CN 113674730B CN 202110926783 A CN202110926783 A CN 202110926783A CN 113674730 B CN113674730 B CN 113674730B
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sound source
secondary sound
active noise
fault detection
control system
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CN113674730A (en
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代海
王洋
玉昊昕
王金林
宁晓峰
行晓亮
袁梦囝
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Xi'an Acoustic Technology Co ltd
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Xi'an Acoustic Technology Co ltd
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    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1781—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions
    • G10K11/17813—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions characterised by the analysis of the acoustic paths, e.g. estimating, calibrating or testing of transfer functions or cross-terms
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
    • G01H11/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties
    • G01H11/06—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by electric means
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1781—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions
    • G10K11/17813—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions characterised by the analysis of the acoustic paths, e.g. estimating, calibrating or testing of transfer functions or cross-terms
    • G10K11/17817—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions characterised by the analysis of the acoustic paths, e.g. estimating, calibrating or testing of transfer functions or cross-terms between the output signals and the error signals, i.e. secondary path
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
    • G10K11/178—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound by electro-acoustically regenerating the original acoustic waves in anti-phase
    • G10K11/1787—General system configurations

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • General Physics & Mathematics (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)

Abstract

The invention discloses a secondary sound source with a fault detection function for an active noise control system and a fault detection method. The invention uses the silicon microphone with high reliability, has the advantages of low cost, low performance cost and stable performance, and has very low false alarm rate and false alarm rate; the fault detection sound collection module is arranged in the secondary sound source box body, is not interfered by external noise, can detect the output of lower sound pressure of the secondary sound source, and ensures the accuracy; the state of the secondary sound source can be known in real time while the active noise control system works normally, and for the system, the secondary sound source component has independent fault detection and fault reporting functions.

Description

Secondary sound source with fault detection function for active noise control system and fault detection method
Technical Field
The invention relates to the technical field of active noise control systems, in particular to a secondary sound source with a fault detection function for an active noise control system and a fault detection method.
Background
In the active noise control system, the secondary sound source is used as one of important electroacoustic devices, plays the role of playing secondary noise data, and generates acoustic interference with primary noise so as to achieve the effect of noise reduction. In the running process of the noise reduction system, the secondary sound source can be failed due to various reasons, if the secondary sound source can not be found in time, unexpected change of the played secondary noise data can be caused, even 'reaction' is caused, the noise of the primary sound field is increased, and the system is unstable. However, in the use process of the secondary sound source, the use environment is noisy, and it is impossible to manually distinguish which secondary sound source has a fault. The quality of the secondary sound source directly affects the noise reduction performance of the active noise reduction device.
For fault detection of the secondary sound source, fault detection is carried out on the secondary sound source when equipment is used for initialization, so that whether the secondary sound source is faulty or not before the secondary sound source is used can be judged, and the fault detection method cannot detect faults of the secondary sound source in real time when the equipment is used. The secondary sound source fault detection carried out by the impedance method of part of the system requires that the secondary sound field is white noise or sweep frequency signal, however, the actual noise reduction system aims at low frequency and narrow band noise when working, so the fault detection carried out by the impedance method has certain limitation.
The invention uses classical microphone detection method, judges whether the secondary sound source is effective according to active noise control logic, and uses the signal received by the microphone as the judgment basis. The microphone has the advantages of low cost and stable performance due to the use of the silicon microphone with very high reliability.
Disclosure of Invention
A secondary sound source with fault detection function for active noise control system and fault detection method are disclosed, which can detect if the secondary sound source has fault in real time under the condition of normal operation of active noise reduction equipment.
In order to achieve the above purpose, the present invention provides the following technical solutions:
The utility model provides a secondary sound source that is used for active noise control system to have fault detection function, includes loudspeaker monomer, voltage acquisition module, sound acquisition module and microprocessor, voltage acquisition module connects the loudspeaker monomer, microprocessor connects voltage acquisition module, sound acquisition module and active noise control system's active noise controller respectively. The voltage acquisition module is connected with the active noise controller.
The sound acquisition module is a silicon microphone.
A fault detection method for an active noise control system is as follows:
Setting detection thresholds T 0 and T 1 for the secondary sound source finished product; the active noise control system can give secondary sound source secondary signal to make loudspeaker monomer in secondary sound source produce sound, the voltage acquisition module acquires voltage U under working state, the silicon microphone can acquire sound signal V under current state, then the sound signal V is provided for microprocessor, and data calculation and analysis are carried out on the signal, including FFT processing, amplitude A and phase P of frequency point calculation, absolute value |T A | and |T P | of amplitude and phase difference value under current state calculation, then the comparison is carried out with set threshold value, the state of secondary sound source is judged according to comparison result, and finally the microprocessor feeds back fault detection result to active noise controller.
A fault detection method for an active noise control system specifically comprises the following steps:
S1, collecting a voltage signal U and an acoustic signal V;
S2, carrying out FFT processing on the voltage signal and the sound signal;
S3, calculating the amplitude A and the phase P of a certain frequency point n, which are represented by a n+bn i:
P＝atan2(bn,an) (2)
wherein atan2 (Y, X) is an angle representing the corresponding (X, Y) coordinate on the X-Y plane, and its range of values is (-pi, pi);
S4, calculating absolute values of amplitude and phase value differences of the voltage signal and the sound signal at a certain frequency point in the current state, and recording the absolute values as |T A | and |T P |;
S5, judging whether secondary sound source is faulty or not
And (3) when the formulas (3) and (4) are simultaneously established, judging that the secondary sound source fails, otherwise, the secondary sound source does not fail.
|TA|≤T0 (3)
|Tp|≤T1 (4)。
The invention has the technical effects and advantages that:
1. The fault detection sound collection module is arranged in the secondary sound source box body, is not interfered by external noise, can detect the output of lower sound pressure of the secondary sound source, and ensures the accuracy;
2. The silicon microphone with high reliability is used, and has the advantages of low cost, low performance cost and stable performance, and the false alarm rate and the missing report rate are very low;
3. The state of the secondary sound source can be known in real time while the active noise control system works normally, and for the system, the secondary sound source component has independent fault detection and fault reporting functions.
Drawings
FIG. 1 is a schematic diagram of a fault detection function module of the present invention;
FIG. 2 is a block diagram of a secondary sound source composition;
FIG. 3 is a flow chart of a secondary sound source fault detection method;
fig. 4 is a FFT modulo graph.
Detailed Description
The following description of the technical solutions in the embodiments of the present invention will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
A secondary sound source with fault detection function for active noise control system and fault detection method are disclosed, which can detect if the secondary sound source has fault in real time under the condition of normal operation of active noise reduction equipment.
The secondary sound source principle module with fault detection function for the active noise control system mainly comprises an active noise controller and a secondary sound source, as shown in fig. 1. The secondary sound source comprises a loudspeaker monomer Speaker, a voltage acquisition module (AD acquisition), a silicone microphone MIC and a microprocessor MCU, as shown in figure 2.
Example two
A fault detection method for an active noise control system comprises the following steps:
First, detection thresholds T 0 and T 1 are set for the secondary sound source finished product. The active noise control system can give secondary signals of a secondary sound source under the working state, a loudspeaker monomer in the secondary sound source can produce sound, the voltage acquisition module can acquire the voltage U under the working state, the silicon microphone can acquire the sound signal V under the current state and then provide the sound signal V for the micro-processing module to perform data calculation and analysis, the method comprises the steps of performing FFT processing on the signals, calculating the amplitude A and the phase P of a frequency point, calculating absolute values |T A | and |T P | of the amplitude and the phase difference value under the current state, comparing the absolute values with a set threshold value, judging the state of the secondary sound source according to a comparison result, and finally feeding the fault detection result back to the active noise controller by the micro-processing module.
The flow of the fault detection method of the secondary sound source is shown in fig. 3:
1. Collecting a voltage signal U and an acoustic signal V;
2. performing FFT processing on the voltage signal and the acoustic signal;
3. Calculating the amplitude A and the phase P of a frequency point n indicated by a n+bn i:
P＝atan2(bn,an) (2)
wherein atan2 (Y, X) is an angle representing the corresponding (X, Y) coordinate on the X-Y plane, and its range of values is (-pi, pi);
4. Calculating the absolute value of the difference value between the amplitude and the phase value of the voltage signal and the sound signal at a certain frequency point in the current state, and recording the absolute value as |T A | and |T P |;
5. Determination of whether a secondary sound source is malfunctioning
And (3) when the formulas (3) and (4) are simultaneously established, judging that the secondary sound source fails, otherwise, the secondary sound source does not fail.
|TA|≤T0 (3)
|Tp|≤T1 (4)。
Example III
Illustrating:
assume that a threshold value T 0 set by a secondary sound source of a qualified finished product of a certain model is 3dB, and T 1 is In operation of the active noise control system, a secondary signal is output to the secondary sound source, the secondary signal being a narrowband signal.
1. The voltage acquisition module acquires the acoustic signals v from the u and silicon microphone in the working state;
2. performing FFT processing on the voltage signal and the acoustic signal;
3. taking the frequency point n as 107Hz, the electric signal complex number as U 107Hz = 761.56+1547.64i, the sound signal complex number as V 107Hz = 241.21+2054.47i, and calculating the amplitude A and the phase P through formulas (1) and (2):
A1＝20*log10(sqrt(761.562+1547.642))＝64.74dB；
P1＝atan2(1547.64,761.56)*180°/π＝63.80°；
A0＝20*log10(sqrt(241.212+2054.472))＝66.31dB；
P0＝atan2(2054.47,241.21)*180°/π＝83.30°。
4. calculating the absolute value of the difference value between the amplitude and the phase value of the voltage signal and the sound signal in the current state:
As shown in fig. 4, it is found that the amplitude value of the acoustic signal at this frequency point is a 0 = 66.31dB; the amplitude value of the electrical signal is a 1 = 64.74dB, i.e. T A＝|A0-A1 |= | 66.31-64.74|db=1.57 dB.
5. Judging whether the secondary sound source is faulty:
And if the result of calculation shows that T A＝1.57dB＜T0 =3 dB, judging that the secondary sound source is normal, and feeding back a fault detection result of the secondary sound source under the current condition of the active noise controller through the micro-processing module.
Example IV
The invention is not only suitable for an active noise control system, but also can be used in a loudspeaker (loudspeaker) box body with high reliability. The invention can detect the single performance of the loudspeaker in real time, and can be used for active sound boxes, such as the loudspeaker of an automobile, the loudspeaker of a high-speed railway car, and the like.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and principles of the invention are intended to be included within the scope of the invention.

Claims (3)

1. A secondary sound source for an active noise control system having a fault detection function, characterized by: the system comprises a loudspeaker monomer, a voltage acquisition module, an acoustic acquisition module and a microprocessor, wherein the voltage acquisition module is connected with the loudspeaker monomer, and the microprocessor is respectively connected with the voltage acquisition module, the acoustic acquisition module and an active noise controller of an active noise control system; the voltage acquisition module is connected with the active noise controller; the sound acquisition module is a silicon microphone;
Firstly, setting detection thresholds T0 and T1 for a secondary sound source finished product; the active noise control system is in a working state, secondary signals of a secondary sound source are given to sound a loudspeaker monomer in the secondary sound source, a voltage acquisition module acquires a voltage U in the working state, a silicon microphone acquires a sound signal V in the current state and then provides the sound signal V for a micro-processing module to perform data calculation and analysis, the micro-processing module performs FFT processing on the signals, calculates the amplitude A and the phase P of a frequency point, calculates absolute values |TA| and |TP| of the amplitude and the phase difference value in the current state, compares the absolute values with a set threshold value, judges the state of the secondary sound source according to a comparison result, and finally feeds back a fault detection result to the active noise controller;
Collecting a voltage signal U and an acoustic signal V;
Performing FFT processing on the voltage signal and the acoustic signal;
the amplitude A and the phase P of a certain frequency point n expressed by an+bni are calculated:
P＝atan2(bn,an) (2)
wherein atan2 (Y, X) is an angle representing the corresponding (X, Y) coordinate on the X-Y plane, and its range of values is (-pi, pi);
Calculating the absolute value of the difference value between the amplitude and the phase value of the voltage signal and the sound signal at a certain frequency point in the current state, and recording the absolute value as |TA| and |TP|;
determination of whether a secondary sound source is malfunctioning
When the formulas (3) and (4) are simultaneously established, judging that the secondary sound source fails, otherwise, the secondary sound source does not fail;
|TA|≤T0 (3)；
|Tp|≤T1 (4)。
2. A fault detection method for an active noise control system, the active noise control system comprising the secondary sound source of claim 1, the method comprising: setting detection thresholds T0 and T1 for the secondary sound source finished product; the active noise control system can give secondary signals of a secondary sound source under the working state, a loudspeaker monomer in the secondary sound source produces sound, the voltage acquisition module acquires voltage U under the working state, the silicon microphone acquires sound signals V under the current state and then provides the sound signals V for the microprocessor to perform data calculation and analysis, the method comprises the steps of FFT processing of the signals, calculating amplitude A and phase P of frequency points, calculating absolute values of amplitude and phase difference values |TA| and |TP| under the current state, comparing the absolute values with a set threshold value, judging the state of the secondary sound source according to the comparison result, and finally feeding back fault detection results to the active noise controller by the microprocessor.
3. A fault detection method for an active noise control system according to claim 2, wherein: the method comprises the following steps:
S1, collecting a voltage signal U and an acoustic signal V;
S2, carrying out FFT processing on the voltage signal and the sound signal;
s3, calculating the amplitude A and the phase P of a certain frequency point n represented by an+bni:
P＝atan2(bn,an) (2)
wherein atan2 (Y, X) is an angle representing the corresponding (X, Y) coordinate on the X-Y plane, and its range of values is (-pi, pi);
S4, calculating absolute values of amplitude and phase value differences of the voltage signal and the sound signal at a certain frequency point in the current state, and recording the absolute values as |TA| and |TP|;
S5, judging whether secondary sound source is faulty or not
When the formulas (3) and (4) are simultaneously established, judging that the secondary sound source fails, otherwise, the secondary sound source does not fail;
|TA|≤T0 (3)
|Tp|≤T1 (4)。
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CN115855237B (en) * 2023-01-03 2023-06-27 杭州爱华仪器有限公司 Microphone fault automatic identification system based on sound level meter

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