摘要
目的瞬态诱发耳声发射信号是从人的外耳检测到的微弱的音频能量,在测试过程中常混入各种随机噪声,本文尝试对瞬态诱发耳声发射信号进行去噪,以提高信号的信噪比,为进一步的临床应用(如频谱分析)奠定基础。方法小波变换阈值法。选用了sym8小波,软阈值处理方法,阈值选取规则为Minimax法。结果去噪后相关系数加大,信噪比提高。信噪比平均提高约10%。结论小波变换阈值法对TEOAE信号去噪取得了较好的效果。
Objective The transient evoked otoacoustic emissions （TEOAE） is a kind of faint signal obtained from the auricle and accompanied by the stochastic noise. The method of denoising is studied to improve the signal-to-noise ratio （SNR） of the TEOAE, that can be laid a foundation for farther dinic application such as spectrum analysis. Method The method of wavdet threshold denoising is used to analyze the TEOAE in this study. We select the sym8 wavelet, softthresholding and the Minimax rule. Result Results show denoising the TEOAE＇ s improves the correlation coefficient and SNR . And the series sym wavdets, softthresholding, Minimax method are better to TEOAE than others. The SNR rises approximate ten pecent. Conclusion The method of wavelet threshold obtains a better effect.
出处
《北京生物医学工程》
2006年第2期182-184,203,共4页
Beijing Biomedical Engineering
