模拟信号调制技术(FM/AM/PM/SSB)
来自Jack's Lab
（版本间的差异）
(→FM) |
(→FM) |
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| 第6行： | 第6行： | ||
== FM == | == FM == | ||
| + | |||
| + | <pre> | ||
* 信号：xm(t) = β·sin (Ωmt) | * 信号：xm(t) = β·sin (Ωmt) | ||
| 第13行： | 第15行： | ||
FM 调制后的波形为：x(t) = Xc·cos [Ωct + β·sin (Ωmt)] | FM 调制后的波形为：x(t) = Xc·cos [Ωct + β·sin (Ωmt)] | ||
| + | |||
| + | </pre> | ||
http://www.rfcafe.com/references/electrical/frequency-modulation.htm | http://www.rfcafe.com/references/electrical/frequency-modulation.htm | ||
2013年12月24日 (二) 13:34的版本
目录 |
1 概述
http://www.rfcafe.com/references/electrical/NEETS-Modules/NEETS-Module-12-2-1-2-10.htm
2 FM
* 信号：xm(t) = β·sin (Ωmt) * 载波：xc(t) = Xc·cos (Ωct) FM 调制后的波形为：x(t) = Xc·cos [Ωct + β·sin (Ωmt)]
http://www.rfcafe.com/references/electrical/frequency-modulation.htm
3 AM
http://www.rfcafe.com/references/electrical/amplitude-modulation.htm
4 QAM
http://en.wikipedia.org/wiki/Quadrature_amplitude_modulation
5 PM
6 SSB
