说明：这是单边带调制源码，求消息信号和已调信号的频谱。
This is a single sideband modulation source, for the signal and the signal has been modulated spectrum.
这艘船上的信号员用旗语向另一艘船发送好消息。
The signalman on the ship wigwagged the good news to the other ship.
消息可以是简单的信号、复杂的节点信息组合或者条件数据。
Messages can be simple signals, complex combinations of node information, or conditional data.
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