A theory analysis is made for a phenomenon of "line group" which is bell shaped, and the spectrum interference between direct path sound and reflected sound is revealed.
从理论上分析了钟型的“线谱群”的产生原因，证明了此现象是反射声和直达声之间的谱干涉引起的。
The fundamental principle of direct digital synthesis (DDS) is introduced in this paper. Based on signal analysis, the ideal output spectrum characteristic of DDS is analyzed briefly.
对DDS基本原理进行了简要介绍，利用信号分析的方法对DDS理想输出进行频谱分析。
Based on the mechanism of direct sequence spread spectrum (DSSS), an analysis is made of the anti noise capability of the DSSS and its advantages and disadvantages are proposed.
在直接序列扩频机理的基础上，就其抗干扰能力给出了理论分析，并指出其优点及不足之处。
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