Noise reduction utilizing cross time-frequency epsilon-filter.
Noise reduction utilizing cross time-frequency epsilon-filter.
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利用交叉时频 epsilon 滤波器降低噪声。
DOI：
10.1121/1.3106126
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
S. Hashimoto
中科院分区：
文献类型：
--
作者：
T. Abe;M. Matsumoto;S. Hashimoto
时频 epsilon 滤波器（TF epsilon 滤波器）是一种先进的 epsilon 滤波器，应用于沿时间轴的复杂频谱。它可以减少大多数类型的噪声，同时保留经常变化的信号，例如语音信号。滤波器设计简单，能有效降低噪声。它不仅适用于小振幅平稳噪声，也适用于大振幅非平稳噪声。然而，当滤波器应用于沿时间轴变化频繁的噪声时，TF epsilon 滤波器无法在不造成信号失真的情况下降低噪声。本文介绍了一种先进的降噪方法，该方法将 epsilon 滤波器应用于复杂频谱，不仅沿时间轴，而且沿标记为交叉 TF epsilon 滤波器的频率轴。它可以减少相邻频率仓具有相似功率的噪声。为了证明该方法的有效性，还给出了一些对比实验，例如降噪性能以及对输入信噪比和参数变化的鲁棒性。
A time-frequency epsilon-filter (TF epsilon-filter) is an advanced epsilon-filter applied to complex spectra along the time axis. It can reduce most kinds of noise while preserving a signal that varies frequently such as a speech signal. The filter design is simple and it can effectively reduce noise. It is applicable not only to small amplitude stationary noise but also to large amplitude nonstationary noise. However, when the filter is applied to the noise that varies much frequently along the time axis, TF epsilon-filter cannot reduce noise without the signal distortion. This paper introduces an advanced method for noise reduction that applies epsilon-filter to complex spectra not only along the time axis but also along the frequency axis labeled cross TF epsilon-filter. It can reduce the noise where the neighboring frequency bins have similar powers. To show the effectiveness of the proposed method, some comparative experiments are also given, such as the performance of noise reduction and the robustness concerning input signal-to-noise ratio and parameter changes.