Analyze and compare a variety of technologies of frequency synthesis, analyze the principle, structure, spectrum and characteristics of direct digital synthesis.

分析比较了各种频率合成技术的优缺点，重点分析了直接数字式频率合成器的原理、结构、频谱以及特点。

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Auctions alone are now considered unsatisfactory, because they do not change the traditional structure of spectrum allocation.

ECONOMIST: Economics focus

But the spectrum scarcity that produced the current structure of British television has disappeared.

ECONOMIST: Britain��s media giants

And these attendees, while representing a diverse spectrum of backgrounds, have one thing in common, a keen realization that the current structure of consuming more than we have is not working.

FORBES: Are We All Just Homogeneous Globules of Desire?