With the outer scale of turbulence increasing, the amplitude of low-frequency spectrum increases and the high-frequency is invariable.

随着等效湍流外尺度的增加，低频谱的幅值逐渐增大，高频谱保持不变。

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MethodsAnalyze spectrum of the sample signal and propose the formula of common sample frequency in low speed.

方法分析了带通采样信号的频谱和规律，导出了低速采样频率的选取公式。

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The utilization rate of licensed spectrum is very low in the time domain, frequency domain and space domain, while the unlicensed band is overcrowded seriously.

大部分授权频段在时域、频域和空间域的利用率很低，而公共频段出现了严重的频谱拥挤。

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"Low-frequency spectrum on a network as big as ours is a real notspot-killer, " he said.

BBC: Mobile firm on rural net crusade

Furthermore, the LightSpeaker's 2.5-inch wide dispersion driver uses digital signal processing to optimize high- and low-frequency output for a full spectrum of sound.

ENGADGET: Klipsch LightSpeaker makes whole home audio as simple as screwing in a light bulb (hands-on)