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am 调制

于 2022-07-26 发布 文件大小:6.44 kB
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y = ammod(x,Fc,Fs) 使用消息信号调制载波信号频率 Fc (Hz) 采用振幅调制的 x。载波信号和 x 有采样频率 (赫兹) 财政司司长。调制的信号具有零初始相位和零载波的振幅,所以结果就是抑制载波调制方式。注: x、 Fc,以及财政司司长输入参数必须满足 Fs > 2 (Fc + BW),BW 哪里的调制带宽信号 x。y = ammod(x,Fc,Fs,ini_phase) 指定的初始阶段中调制的信号 y 以弧度为单位。y = ammod(x,Fc,Fs,ini_phase,carramp) 执行而不是抑制载波调制传输载波调制方式。载波幅值是 carramp。例子下面的示例比较双边带和单边振幅调制。%样品 100 次 / 秒,2 秒的信号。Fs = 100 ;t = [0: 2 * Fs + 1] "/Fs ;Fc = 10 ;载波频率 %x = sin(2*pi*t) ;正弦信号 %调制 x 使用和双-单边 AM。ydouble = ammod(x,Fc,Fs) ;ysingle = ssbmod(x,Fc,Fs) ;%计算光谱的调制信号。zdouble = fft(ydouble) ;zdouble = abs(zdouble(1:length(zdouble)/2+1)) ;frqdouble = [0:length (zdouble)-1] * Fs/长度 (zdouble) / 2 ;zsingle = fft

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