Such assumptions sometimes may result in narrow frequency band, large time delay and unstable system.

这样得到的控制系统频带较窄、时滞大，还有可能出现控制系统不稳定。

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Based on T type filter, the new ballast can achieve a wide dimming range with a very narrow frequency variation range, and it can operate with low lamp current crest factor.

基于T型滤波器的调光方法，能在很窄的工作频率范围内实现深度调光，同时具有灯电流波峰因数低的优点。

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The speech is sparse in time-frequency domain, so the energy of voice signal only concentrates on some narrow frequency, and the energy of voice sources are not overlap each other.

由于语音信号是时频稀疏的，语音信号的能量主要集中在某些窄带上，且各语音源的能量集中区域不交迭。

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The problem with the craft's back-up radio was that it could only receive signals in a very narrow frequency range which turned out to vary according to its temperature.

ECONOMIST: The long arm of the celestial repairman