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水平的方向被限制类比信号有多快的速度决定了其是否允许被改变。
The resolution in the horizontal direction is limited by how rapidly the analog signal is allowed to change.
然后我们介绍一些常用的类比调变方法，并讨论如何接收这些信号。
We then introduce some commonly used analog modulation methods and discuss how to receive the signals.
这是一类比普通并元码概念更加广泛，但同样具有良好并元相关特性的最佳离散信号。
This is a kind of perfect discrete signal with more extensive concept than the common dyadic code but with the same good dyadic relative properties.
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