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Acoustic-wavelet-packet-based millimeter-wave biological radar speech enhancement method

A bio-radar and speech enhancement technology, applied in speech analysis, instruments, etc., can solve the problems that hinder the progress of bio-radar speech detection technology and reduce the quality of radar speech

Inactive Publication Date: 2017-05-31
FOURTH MILITARY MEDICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These noises greatly reduce the quality of radar voice, and also hinder the progress of biological radar voice detection technology

Method used

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  • Acoustic-wavelet-packet-based millimeter-wave biological radar speech enhancement method
  • Acoustic-wavelet-packet-based millimeter-wave biological radar speech enhancement method
  • Acoustic-wavelet-packet-based millimeter-wave biological radar speech enhancement method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0091] In order to ensure the consistency of the sound source, a male experimenter's recording material "1-2-3-4-5-6" was selected and played by a speaker at a distance of 2 meters from the radar system.

[0092] The radar voice is enhanced in the following steps:

[0093] 1) Utilize 8-channel Powerlab physiological recorder to sample the biological radar voice, the sampling rate is 10kHz; the original noisy radar voice signal is obtained through sampling;

[0094] 2) The noise distribution characteristics of the original radar voice signal are: the lower the frequency, the greater the amount of noise;

[0095] 3) performing auditory characteristic wavelet packet decomposition on the above-mentioned original radar voice signal;

[0096] 4) denoising the decomposed auditory wavelet packet through adaptive node threshold and modified threshold function;

[0097] 5) Reconstruct the denoised auditory wavelet packet to obtain the enhanced radar speech.

[0098] Comparison of pro...

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Abstract

The invention discloses an acoustic-wavelet-packet-based millimeter-wave biological radar speech enhancement method. On the basis of a wavelet packet method, a problem of the noise interference on a radar speech can be solved, so that the biological radar speech quality can be improved. According to the method disclosed by the invention, on the basis of the radar speech noise distribution characteristics, wavelet packet fitting and ear Bark frequency-band division are carried out; and radar speech enhancement is carried out by using an acoustic wavelet packet adaptive node threshold algorithm. The example demonstrates that noises in the radar speech can be removed effectively by using the voice enhancement technology on the premise that voice distortion is avoided, so that the radar voice quality can be improved. Therefore, an effective technical support can be provided for human body voice detection based on biological radar in future.

Description

【Technical field】 [0001] The invention relates to the fields of voice signal acquisition and voice enhancement, in particular to a millimeter-wave biological radar voice enhancement method based on auditory wavelet packets. 【Background technique】 [0002] Bio-radar voice detection technology overcomes the fact that traditional microphone voice detection devices are extremely susceptible to environmental acoustic noise interference. Throat microphones and bone conduction microphones need to be in contact with the detection device with human skin, and optical voice detection sensors are susceptible to environmental factors such as temperature and climate. It has the advantages of non-contact, non-invasive, safe, good directionality, high sensitivity, long detection distance, and strong anti-interference ability. The non-contact voice signal detection technology based on bio-radar uses electromagnetic waves as the detection medium. When the electromagnetic waves reach the human...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G10L21/0208
CPCG10L21/0208
Inventor 陈扶明王健琪李盛吕昊
Owner FOURTH MILITARY MEDICAL UNIVERSITY