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Error microphone having fault detection function and used for active noise control system and fault detection method

An active noise control and error microphone technology, which is applied in the directions of sound-producing instruments and instruments, can solve the problems of real-time detection of error microphone states, etc., and achieves the effect of simple method and high efficiency

Pending Publication Date: 2022-02-08
西安艾科特声学科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method cannot detect the state of the error microphone in real time when the device is in use

Method used

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  • Error microphone having fault detection function and used for active noise control system and fault detection method
  • Error microphone having fault detection function and used for active noise control system and fault detection method
  • Error microphone having fault detection function and used for active noise control system and fault detection method

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Experimental program
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Effect test

Embodiment 1

[0029] like figure 1 As shown, a principle module of an error microphone fault detection scheme for an active noise control system mainly includes an active noise controller, a secondary sound source, and an error microphone. The active noise controller is connected to the secondary sound source, The error microphone is connected to an active noise controller, and the error microphone module includes a main microphone, a reference microphone and a microprocessor. The main microphone and the reference microphone are connected to the microprocessor, and finally the signal of the main microphone and the fault detection result signal processed by the microprocessor are sent to the active noise controller. In engineering applications, the microprocessor can be a processor with signal processing functions such as DSP, FPGA or STM32 single-chip microcomputer.

Embodiment 2

[0031] When the active noise controller is working, the error microphone collects the primary noise signal in the current environment in real time and feeds it back to the active noise controller. The secondary sound source is used to send out the secondary signal (the sound that cancels out the primary noise). In this process, the error microphone module uses two microphones with the same performance to collect, one of which is the main microphone, which is used to feed back the primary noise signal to the active noise controller, and the other is the reference microphone, which also has the same effect, but it is only used to provide the signal comparison between the microprocessor and the main microphone, and the microprocessor is used to calculate the correlation coefficient between the main microphone and the reference microphone signal, and compare it with the set threshold (if not set Within the threshold, it is judged that the error microphone is faulty), and the fault ...

Embodiment 3

[0044] Given that the sensitivity of a certain type of error microphone is 7.9mv / Pa, and the threshold T is set to 0.8, after the active noise reduction device is turned on, the secondary sound source and the error microphone start to work:

[0045] 1. The error microphone collects the primary noise, and the secondary sound source plays the secondary signal. The primary noise signals collected by the main error microphone and the reference error microphone for a certain period of time are x and y, such as image 3 shown;

[0046] 2. Calculate the correlation coefficient r between x and y through formula (1):

[0047] r=0.98;

[0048] 3. Whether the error microphone is faulty or not:

[0049] Comparing r=0.98>T=0.8, it is judged that the error microphone is normal;

[0050] 4. Feedback the fault detection result and the primary noise signal to the active noise controller.

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Abstract

The invention discloses an error microphone having a fault detection function and used for an active noise control system and a fault detection method. The error microphone comprises an active noise controller, a secondary sound source and an error microphone, wherein the active noise controller is connected with the secondary sound source, the error microphone is connected with the active noise controller, and a microprocessor is used for calculating a correlation coefficient between the signals of a main microphone and a reference microphone, comparing the correlation coefficient with a set threshold value, and if the correlation coefficient is not within the set threshold value, judging that the error microphone has a fault and feeding back a fault detection result to the active noise controller. The error microphone has the greatest advantages that fault detection can be carried out on the error microphone in real time in the working process of the active noise control system, and the working state of the error microphone is known. According to the invention, the working state of the error microphone is known in real time, and the error microphone with a fault can be found in time; and the method is simple and high in efficiency;.

Description

technical field [0001] The invention relates to the technical field of active noise control systems, in particular to an error microphone 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 error microphone is one of the important electro-acoustic devices. Its function is to use the error microphone to measure the noise to obtain the primary noise data. During the working process, it is necessary to know the error microphone in real time. state to determine whether it is faulty. [0003] The error microphone is a microphone used in an active noise control system. The error microphone picks up the noise signal, converts the acoustic signal into an electrical signal, and inputs it to the active controller as a control signal. [0004] At present, in the active noise control system, before using the equipment, start the fault detection function to carry out self-i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/178
CPCG10K11/17833G10K11/17813G10K11/17875
Inventor 代海王洋景亚鹏王金林宁晓峰龙拉怀
Owner 西安艾科特声学科技有限公司
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