生命层
发表于 2025-3-30 11:11:13
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不能妥协
发表于 2025-3-30 15:33:47
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用手捏
发表于 2025-3-30 20:19:04
Modulation Methods,n Figure 5.1. Analog signals have continuously varying amplitudes while digital signals consist of discrete pulses. These signals, whether digital or analog, are called baseband signals. In Chapter 3 it was shown that baseband signals cannot be transmitted for any appreciable distance over a communi
GRUEL
发表于 2025-3-31 00:32:03
Transmission Impairments,nnel for data communications usage. In this chapter a summary is presented of the different types of impairments suffered by the communications channels and of the efforts to correct them. At all times it should be kept in mind that the net effect of these distortions is to reduce, or limit, the cap