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Active denoising method

An active noise reduction and noise reduction technology, which is applied in the direction of sound-emitting devices, printing, and instruments, can solve problems that endanger the physical and mental health of operators, and achieve the effects of simple implementation, elimination or noise pollution, and reduction of noise pollution

Inactive Publication Date: 2009-02-18
CHINA BANKNOTE PRINTING & MINTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, no matter which method has its limitations, it is often restricted by factors such as noise type, use environment, installation space, equipment structure, and cost in actual application, and it is difficult to effectively apply it to some specific equipment, such as the printing field. Printing machines, sorting machines, paper machines, etc., and the continuous and regular noise generated by these devices is always endangering the physical and mental health of operators

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Embodiment Construction

[0019] In the present invention, an active sounding device is provided to emit a sound with the same frequency and wavelength as the noise but with an opposite phase to offset or reduce the noise, thereby completing the active noise reduction of the equipment. Its principle is very simple, expressed in mathematical language is (+1)+(-1)=0, this method is to use the method of superimposing and canceling the reverberation of sound to complete.

[0020] The propagation of sound in space is a three-dimensional space propagation. In order to achieve noise reduction and noise reduction effects in space, in the directional noise reduction research of free sound field in space, an anechoic area formed by the interference of spherical sound waves in space is established. The device shown in Figure 3 will be described on this basis. Point 0 is the sound source of noise, A1, A2, A3 are sound detectors, B1, B2, B3 are speakers, C1, C2, C3 are feedback collectors. When installing speakers...

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Abstract

The invention discloses a method for actively reducing noise, which comprises at different directions in space influenced by steady, continuous, regular noise sent out by the device, detecting noise sent out by a device using a sound detector; analyzing characteristics of direction, frequency, wavelength and amplitude of the noise; arranging speaker facing to noise source respectively at different directions according to the characteristic of direction of the noise; sending out reverse sound wave according to the characteristics of frequency, wavelength and amplitude to counteract or reduce noise sent out by the noise source in the space. The invention uses the reverse sound wave to counteract or reduce noise, not only can effectively eliminate or reduce noise pollution in working environment of the operation personnel, but also has stronger pertinency and more convenient implementation.

Description

technical field [0001] The invention relates to an active noise reduction method, in particular to an active noise reduction method applied to equipment in printing and related fields. Background technique [0002] With the development of science and technology, we are surrounded by various automated production equipment. While these equipment have improved our production capacity, they have also brought noise pollution to our working environment. Because a noisy environment not only interferes with people's normal work, but even endangers people's physical and mental health in serious cases, people use various means to eliminate or reduce noise in order to create a quiet working environment for people. [0003] In the past, the methods commonly used by people include: eliminating the noise caused by vibration by adding shock absorption measures, using the shell with sound-absorbing materials to shield the noise, and reducing the noise by setting a special noise-absorbing st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10K11/178B41F33/00
Inventor 辛小温吴硕夫韩绪艳
Owner CHINA BANKNOTE PRINTING & MINTING