Noise eliminating method and device

Abstract

The invention provides a noise eliminating device and method. The noise eliminating device comprises a corona electrode which produces air conditioning, a high-voltage power supply which produces electric potential on the corona electrode, a control circuit which can adjust the size of the electric potential and a sound detection device connected with the control circuit. The noise eliminating method comprises the following steps of: firstly, detecting introducing sound, and producing a corresponding electrical signal according to the sound strength and a wave form; secondly, transforming theelectrical signal to a corresponding high-voltage signal according to the sound strength and wave form; thirdly, producing ion emission strength and wave form according to the strength of the introducing sound; and fourthly, producing the sound having the opposite phase with the introducing sound by ion emission. Compared with the prior art, the invention has the advantage of effectively eliminating noise in time.

Description

technical field [0001] The invention relates to a method and device for eliminating noise, in particular to a method and device for eliminating noise through air conditioning. Background technique [0002] There are a number of patents, such as U.S. Patent Nos. 4,689,821, 5,499,301 and 7,292,704, which describe noise control systems that reduce transmitted noise by outputting secondary noise sources of equal amplitude but opposite sound levels. into the noise level. [0003] Another example is the noise canceling system described in US Patent No. 7,536,018, which has a loudspeaker that emits a canceling signal based on a control signal. Among them, the microphone of the noise cancellation system is used to detect false signals, and then the noise in the same area can be reduced to the same level as before the microphone received it. [0004] However, in the prior art, the noise elimination process has not been disclosed systematically. In order to achieve noise control, a...

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Problems solved by technology

[0004] However, in the prior art, the noise elimination process has not been disclosed systematically

In order to achieve noise control, a "secondary source" should cover or block the sound waves from entering the noise area, but this is pointless and not as effective as a traditional sound barrier

[0005] Another major disadvantage of existing noise canceling devices is that traditional speakers require the use of membranes, however the mass of the membranes can cause inertial hysteresis, these membranes prevent the speaker from producing instantaneous sound

Therefore, the existing noise canceling device can only reduce repetitive noise with a fixed frequency, which is very inefficient in actual use

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