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Acoustic interaction active noise reduction device arranged at vent pipe port and control method

A noise reduction and acoustic technology, applied in the field of active noise reduction devices, can solve problems such as voice and other acoustic signal interference, adaptive noise reduction algorithm interference, lack of effective methods, etc., to achieve the effects of good performance, small size, and convenient use

Active Publication Date: 2018-05-29
QINGDAO TECHNOLOGICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, active noise reduction and acoustic interaction interfere with each other: the microphone of the active noise reduction system is generally placed in a position where the low-frequency noise is more prominent, which brings great interference to the extraction of acoustic signals such as speech in the target area; in addition, When the speakers of the active noise reduction system are directly used to play music and other acoustic signals, it will strongly interfere with the adaptive noise reduction algorithm and seriously affect the normal operation of the system
How to organically combine active noise reduction and acoustic interaction, there is still no effective method

Method used

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  • Acoustic interaction active noise reduction device arranged at vent pipe port and control method
  • Acoustic interaction active noise reduction device arranged at vent pipe port and control method
  • Acoustic interaction active noise reduction device arranged at vent pipe port and control method

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Experimental program
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Effect test

Embodiment 1

[0033] see figure 1 and figure 2 , an active noise reduction device that is located at the ventilation duct and can interact acoustically, including a housing 1, a loudspeaker 2, a reference microphone 3, and a plurality of error microphones 4 ( Figure 1 to Figure 3 Show four), a controller 5 and a diffuser 6; the bottom surface of the housing 1 offers a first through hole 11, and the top of the housing 1 offers a second through hole 12; the speaker 2 is set in the casing 1, and its paper cone 21 faces outward and is set on the first through hole 11, and the inner space surrounded by the casing 1 and the speaker 2 forms the speaker 2 Rear cavity; the reference microphone 3 is arranged on the second through hole 12 and the acoustic input end of the reference microphone 3 faces the outside of the housing 1; each of the error microphones 4 is arranged on the housing 1 and located near the edge of the bottom surface, the acoustic input ends of each of the error microphones 4 a...

Embodiment 2

[0041] see Figure 4 and Figure 5 , an active noise reduction control method capable of acoustic interaction, which is combined with the active noise reduction device described in Embodiment 1, the reference microphone 3 picks up the acoustic signal in the ventilation duct, which includes the original noise signal inside the duct, The anti-phase noise signal sent by the loudspeaker 2 and the audio signal input by the external sound control device 7 played by the loudspeaker 2; the sound signal picked up by the error microphone 4 includes: the original noise signal propagated from the inside of the pipeline and the The residual noise signal formed by superimposing the anti-phase noise signal of the anti-phase noise signal, the audio signal input by the external voice control device 7 played by the speaker 2, and the control voice sent by people; the digital signal processor 53 is provided with a software module for processing the acoustic signal , including a noise reduction ...

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Abstract

The invention relates to an acoustic interaction active noise reduction device arranged at a vent pipe port. The acoustic interaction active noise reduction device comprises a shell, a loudspeaker, areference microphone, a plurality of error microphones, a controller and a flow diffuser. The loudspeaker is arranged in the shell. The reference microphone is arranged on the top of the shell. The acoustic input end of the reference microphone faces the outer portion of the shell. The error microphones are arranged on the bottom surface of the shell and are arranged in the positions close to theedge of the bottom surface. The controller is arranged in the shell. The loudspeaker, the reference microphone and the error microphones are all in lead wire connection with the controller. A third through hole is formed in the center of the flow diffuser. The bottom surface of the shell is arranged in the third through hole. The invention further provides an acoustic interaction active noise reduction control method. The acoustic interaction active noise reduction device is simple in structure and small in size, and acoustic interaction can be achieved through the active noise reduction device during active noise reduction.

Description

technical field [0001] The invention relates to the technical field of noise control, in particular to an active noise reduction device and a control method which are arranged at a ventilation pipe opening and capable of acoustic interaction. Background technique [0002] With the progress of modern society and the improvement of people's living standards, the problem of noise pollution has become increasingly prominent, which has seriously affected people's daily life. With the wide application of noise control technology, the noise from the air inlet and outlet of the central air conditioner and fresh air system has become one of the main noise sources in the indoor environment. The low-frequency component of the noise is relatively prominent, and it is difficult to effectively suppress it by means of passive noise reduction in a limited space. [0003] Active noise control is an active noise control technology based on the principle of coherent superposition of sound wav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24F13/24G10K11/178
CPCG10K11/178F24F13/24F24F2013/247Y02B30/70
Inventor 安峰岩刘碧龙
Owner QINGDAO TECHNOLOGICAL UNIVERSITY
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