理想的室内音质是无噪声干扰的。

The perfect indoor acoustics has no noise.

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全面分析了一种保护用软件频率跟踪算法的性能，论证了在无噪声干扰的情况下该算法的有效性。

A software based frequency tracking algorithm for protective relaying is analyzed thoroughly. in this paper, the availability of this algorithm under the non-noise condition is proved.

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文中给出了当系统中有白噪声干扰和无噪声干扰两种情况下系统模拟仿真调节试验的结果，说明本文的自校正算法是有效的。

Two examples of analogue simulation for systems either with white noise or without noise are given. The results show that the self-tuning algorithm presented in this paper is useful.

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