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Method for eliminating noise in millimeter wave biological radar voice

A bio-radar, millimeter-wave technology, applied in speech analysis, instruments, etc., can solve problems such as affecting speech intelligibility and reducing radar speech quality, achieving strong adaptability and effectiveness, improving radar speech quality, and strong adaptability Effect

Inactive Publication Date: 2017-04-26
FOURTH MILITARY MEDICAL UNIVERSITY +1
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Problems solved by technology

At present, although the millimeter-wave biological radar can effectively acquire human voice signals 20 meters away, the acquired voice signals are often interfered by electromagnetic harmonic noise, circuit noise, and environmental noise. The quality of speech even affects the intelligibility of speech. Therefore, how to effectively eliminate the noise content in radar speech is of great significance to the further application of millimeter-wave bio-radar technology in the field of speech detection.

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  • Method for eliminating noise in millimeter wave biological radar voice
  • Method for eliminating noise in millimeter wave biological radar voice
  • Method for eliminating noise in millimeter wave biological radar voice

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Embodiment

[0119] In order to ensure the consistency of the sound source, a female experimenter's recording material "1-2-3-4-5-6" was selected and played by a speaker at a distance of 5 meters from the radar system.

[0120] The radar voice is enhanced in the following steps:

[0121] 1) Sampling the biological radar voice to obtain the original noisy radar voice signal;

[0122] 2) Empirical mode decomposition is performed on the collected original radar voice signal;

[0123] 3) Carry out noise content analysis on the intrinsic mode function after empirical mode decomposition;

[0124] 4) According to the distribution characteristics of radar speech noise, the selection of the number of noise components is carried out by using mutual information entropy;

[0125] 5) Reconstructing the intrinsic mode function after adaptive denoising to obtain the enhanced radar speech.

[0126] For comparison of processing results, please refer to image 3 , Figure 4 , Figure 5 As shown, each ...

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Abstract

The invention discloses a method for eliminating noise in millimeter wave biological radar voice. After an acquired millimeter wave radar voice signal is subjected to empirical mode decomposition, the method, on the basis of analysis of noise content in an intrinsic mode function, de-noises a high-frequency part, a intermediate-frequency part, and a low-frequency part by using an adaptive threshold according to the characteristics of the noise distribution in the intrinsic mode function so as to eliminate the noise content in the voice in a targeted way based on the amount of the noise content, has strong adaptability and effectiveness, in particular can well retain detail information of the voice, and contributes to a significant improvement in radar voice quality. An example using the method shows that the targeted empirical mode decomposition method can effectively eliminate the noise content in the millimeter wave radar voice. Compared with a conventional voice enhancement method, the method has strong adaptability and can significantly improve voice intelligibility on the basis of eliminating the noise content in the radar voice.

Description

【Technical field】 [0001] The invention relates to the field of radar voice signal processing, in particular to a method for eliminating noise in millimeter wave biological radar voice. 【Background technique】 [0002] As a voice detection method with non-contact, long-distance, and strong anti-acoustic noise interference capabilities, bio-radar voice detection technology breaks through the limitations of microphones that are susceptible to acoustic noise interference and other voice detection devices that need to be in contact with human skin. It has been applied and developed in the field of speech detection. At present, although the millimeter-wave biological radar can effectively acquire human voice signals 20 meters away, the acquired voice signals are often interfered by electromagnetic harmonic noise, circuit noise, and environmental noise. The quality of speech even affects the intelligibility of speech. Therefore, how to effectively eliminate the noise content in rad...

Claims

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Application Information

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IPC IPC(8): G10L21/0208G10L21/0224G10L21/0232G10L21/0308G10L25/27
CPCG10L21/0208G10L21/0224G10L21/0232G10L21/0308G10L25/27G10L2021/02087
Inventor 陈扶明王健琪李盛李钊
Owner FOURTH MILITARY MEDICAL UNIVERSITY
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