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本文介绍了用 小波变换模极大 值检测信号奇 异性的方法, 讨论了 信号与 白噪声 的小 波变换 和奇 异性指数之间区 别,模极大值沿 尺度 传递 的不同 特点 ,并 利用它 们的 区别 消除 诱发 电位 信号 中的噪 声,重 构出消 噪后 的信号, 取得 了较好 的效果 ,利用 较少的 刺激 次数就 可获取 诱发电 位信 号,有 效地提高 了信 噪比,大 大减 少了迭 加次数 ,特征 波的潜 伏期 及幅值 容易辨 认,易 于测量 ,且无 信号 失真。奇异性检 测技术有望成为 临床实用的诱 发电位提取 技术,并 可应用 于其他 生物 医学信 号的 消噪。
This paper introduces the method of detecting the singularity of signal using modulus maxima of wavelet transform. It discusses the difference between wavelet transform and singularity index of signal and white noise, the different characteristics of modulus maxima along the scale and their differences Eliminating the noise in the evoked potential signal and reconstructing the de-noised signal, and obtaining good results. The evoked potential signal can be obtained by using less stimulation times, the signal-to-noise ratio is effectively improved, and the superposition is greatly reduced The number of times, the latent period and the amplitude of the characteristic wave are easy to identify, easy to measure, and there is no signal distortion. Singularity detection technology is expected to become a clinical and practical evoked potential extraction technology, and can be applied to other biomedical signal denoising.