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稳定线性时频变换 降噪算法

于 2022-06-16 发布 文件大小:1.47 kB
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 SLTF算法的原理是:信号通过SLTF算法,在变换域中以比较少的,能量较高的,集中的系数来表示,而噪声通过SLTF算法,在变换域中以比较均匀的,能量较低的,分散的系数来表示。然后,通过设定一个噪声阀值,高于该阀值的系数保留,低于该阀值的系数去掉,这样可有效地消除噪声部分。     SLTF算法具有良好的降噪性能,缺点是在设阀值消噪过程中,会损失部分信号的细节,导致最后还原的时候,信号有一定程度的失真。 降噪的关键在于找到能够在a矩阵中分离噪声能量系数与信号能量系数的变换域,据试验知,M=N=8和M=N=10是具有很好的分离噪声能量系数与信号能量系数的变换域,通过这两个变换域降噪后,能使信噪比提升3db左右。

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