The results show the proposed algorithm is better than common RWPT and node threshold method, especially for the speech contained periodic noise.

结果表明，算法优于传统实小波包变换及点阈值算法，尤其对含周期噪声的语音信号，双树复小波包变换算法的优势更为明显。

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The noises on low- voltage power networks are classified four types including background noise, periodic noise, burst noise and narrow band noise.

低压配电网电力线噪声可以分为背景噪声、与工频同步的周期性噪声、突发性噪声、窄频带噪声等。

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The statistic of wavelet transform coefficient algorithm can solve the periodic noise, high-energy noise and some non-Gauss noise simply and effectively;

统计算法在解决周期信号、高能噪声和高斯信号方面有独特之处，能简单有效提取以上噪声的特征；

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The firm maintains that it had been pitching its patented noise cancellation to Apple in periodic meetings between 2007 and 2010, only to watch as 1 Infinite Loop used Audience's technology for the iPhone 4 instead -- and supposedly handed some of Noise Free's work to a competitor.

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On this afternoon at Associated, periodic silence in the room was broken by the loud, throbbing noise of generators in the vicinity--the sound of another outage.

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