Noise filtering method and device

A noise and filtering technology, applied in the field of noise filtering methods and devices, capable of solving problems such as distortion

Active Publication Date: 2016-07-27
西安乾乾智能科技有限公司
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Problems solved by technology

It filters all the signals with a frequency less than 300Hz in a one-size-fits-all manner, but the sound signal with a frequency less than 300Hz includes both noise signals and useful sound signals, so the one-size-fits-all filtering method not only filters out noise signals, but also Filter out the useful signal in the frequency band, making it distorted

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  • Noise filtering method and device

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Embodiment Construction

[0047] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0048] An embodiment of the present invention provides a noise filtering method, such as figure 1 As shown, the method includes:

[0049] Step 1, obtain the time domain noise signal in the environment, perform Fourier transform on the time domain noise signal to obtain the frequency domain noise signal; calculate the average power of the frequency domain noise signal; determine the frequency domain noise signal Noise wavelet signals corresponding to P frequen...

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Abstract

The invention belongs to the noise filtering technical field and relates to a noise filtering method and device. The noise filtering device includes a microphone, an analog-to-digital converter, a signal processor, a digital-to-analog converter, a power amplifier and a loudspeaker; the output end of the microphone is connected with the input end of the analog-to-digital converter; the output end of the analog-to-digital converter is connected with the input end of the signal processor; the output end of the signal processor is connected with the input end of the digital-to-analog converter; the output end of the digital-to-analog converter is connected with the input end of the power amplifier; and the output end of the power amplifier is connected with the input end of the loudspeaker. With the noise filtering method and device adopted, noises specified by a user can be recorded, and the frequency-domain characteristics of the noises are analyzed, and the noises are filtered according to the frequency-domain characteristics.

Description

technical field [0001] The invention relates to the technical field of noise filtering, in particular to a noise filtering method and device. Background technique [0002] At present, noise is everywhere. In order to avoid the influence of noise, anti-noise earplugs can be worn, but the user cannot hear useful sound information after wearing the earplugs. At present, there are generally two ways to solve this problem. One is to use mechanical filtering to filter out noises such as construction and vibration with a frequency less than 300 Hz. The second is for a specific use environment, such as a mining site, a mechanical filter is specially set up to filter out the noise on site. In both solutions, earplugs with mechanical filtering are used to solve the noise problem. The disadvantage of the above two methods is that the device can only be applied to specific occasions and specific sounds and can only filter out low-frequency (less than 300 Hz) sound signals. In differe...

Claims

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Application Information

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IPC IPC(8): H04R3/02
CPCH04R3/02
Inventor 陈杰
Owner 西安乾乾智能科技有限公司
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