fm是frequency modulation的缩写,即频率调制,也叫调频,是利用频率
不同频率的脑波相互作用的现象,叫跨频率耦合(cross-frequency).
载波信号的频率随着调制信号改变,称为频率调制或者调频(fm:frequency
比如像fm调制的信号,其时域波形和频谱如下图所示.
无线电技术(或radio frequency)已广泛应用于日常生活,如wifi,蓝牙,fm
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