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

A technology for active noise control and secondary sound sources, applied in the measurement of ultrasonic/sonic/infrasonic waves, sound-generating instruments, measuring devices, etc., can solve problems such as failures of secondary sound sources that cannot be detected in real time, and achieve low performance cost and high performance The effect of stability and guaranteed accuracy

Pending Publication Date: 2021-11-19
西安艾科特声学科技有限公司
View PDF0 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For the fault detection of the secondary sound source, it is currently used to detect the fault when the device is initialized. This can only determine whether the secondary sound source is faulty before use. This fault detection method cannot be used in the device. Real-time detection of failures in secondary sound sources during use
Some systems use the impedance method to detect secondary sound source faults, requiring that the secondary sound field must be white noise or frequency sweep signals. Fault detection, there are certain limitations

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Secondary sound source with fault detection function for active noise control system and fault detection method
  • Secondary sound source with fault detection function for active noise control system and fault detection method
  • Secondary sound source with fault detection function for active noise control system and fault detection method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A secondary sound source with fault detection function for an active noise control system and a fault detection method The main purpose is to detect whether the secondary sound source is faulty in real time when the active noise reduction equipment is working normally .

[0034] The principle module of secondary sound source with fault detection function for active noise control system mainly includes active noise controller, secondary sound source, such as figure 1 shown. The secondary sound source includes a single speaker Speaker, a voltage acquisition module (AD acquisition), a silicon microphone MIC and a microprocessor MCU, such as figure 2 shown.

Embodiment 2

[0036] A fault detection method for an active noise control system, the steps are as follows:

[0037] First, set the detection threshold T for the finished secondary sound source 0 and T 1 . When the active noise control system is working, it will give the secondary signal to the secondary sound source, so that the speaker in the secondary sound source will sound, the voltage acquisition module will collect the voltage U in the working state, and the silicon wheat microphone will collect the current The acoustic signal V in the state is then provided to the micro-processing module for data calculation and analysis, including FFT processing on the signal, calculation of the amplitude A and phase P of the frequency point, and calculation of the amplitude and phase difference in the current state Absolute value|T A |with|T P |, and then compared with the set threshold, judge the state of the secondary sound source according to the comparison result, and finally the micro-pro...

Embodiment 3

[0051] for example:

[0052] Assume that the threshold T set by the secondary sound source of a certain type of qualified finished product 0 3dB,T 1 for In the active noise control system, the secondary signal is output to the secondary sound source, and the secondary signal is a narrowband signal.

[0053] 1. The voltage acquisition module collects u in the working state and the silicon wheat microphone collects the acoustic signal v;

[0054] 2. Perform FFT processing on the voltage signal and the acoustic signal;

[0055]3. Take the frequency point n as 107Hz, and the complex number of the electrical signal as U 107Hz =761.56+1547.64i, the complex number of the acoustic signal is V 107Hz =241.21+2054.47i, through the formulas (1) and (2), calculate the amplitude A and phase P:

[0056] A 1 =20*log 10 (sqrt(761.56 2 +1547.64 2 )) = 64.74dB;

[0057] P 1 =atan2(1547.64,761.56)*180° / π=63.80°;

[0058] A 0 =20*log 10 (sqrt(241.21 2 +2054.47 2 )) = 66.31dB;

...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

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 secondary sound source comprises a loudspeaker body, a voltage acquisition module, a sound acquisition module and a microprocessor, wherein the voltage acquisition module is connected with the loudspeaker body, and the microprocessor is connected with the voltage acquisition module, the sound acquisition module and an active noise controller of the active noise control system. According to the sound source, the silicon microphone with high reliability is used, so the sound source has advantages of low cost, low performance cost and stable performance, and the false alarm rate and the missing report rate are very low; the sound acquisition module for fault detection 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 accuracy at the same time; when the active noise control system works normally, a state of the secondary sound source can be known in real time, and for the system, the secondary sound source component has independent fault detection and fault reporting functions.

Description

technical field [0001] The invention relates to the technical field of active noise control systems, and more specifically relates to a secondary sound source and a fault detection method for an active noise control system with a fault detection function. Background technique [0002] In the active noise control system, the secondary sound source is one of the important electro-acoustic devices. Its function is to play the secondary noise data and produce acoustic interference with the primary noise, which can achieve the effect of noise reduction. During the operation of the noise reduction system, the secondary sound source will fail due to various reasons. If it cannot be found in time, it will cause unexpected changes in the played secondary noise data, and even have a "reverse effect", causing the primary The noise in the sound field increases, causing system instability. However, during the use of the secondary sound source, the use environment is relatively noisy, an...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G10K11/178G01H11/06
CPCG10K11/17813G10K11/17817G10K11/1787G01H11/06
Inventor 代海王洋玉昊昕王金林宁晓峰行晓亮袁梦囝
Owner 西安艾科特声学科技有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap