模拟单边带调幅及解调

基本要求：

 　　产生300 ~ 3400Hz的调制信号，画出时域波形及频谱；

 　　产生载波信号，频率自定义，画出时域波形及频谱；

 　　产生加性高斯白噪声，画出时域波形及频谱；

 　　单边调幅，画出叠加噪声后的调制信号和已调信号的波形及频谱；

 　　设计滤波器，画出幅频响应图；

 　　解调，画出解调后的信号时域波形及频谱，并对比分析。

-Simulation of single sideband amplitude modulation and demodulation basic requirements: 　300 ~ 3400Hz generate the modulation signal, draw time-domain waveform and frequency spectrum　　generated carrier signal, the frequency of self-definition, draw time-domain waveform and frequency spectrum　　have a high additive Adams white noise, draw time-domain waveform and frequency spectrum　　unilateralism AM, draw superimposed noise signal and the modulation transfer signal waveform and spectrum　　design filters, amplitude-frequency response of draw　　demodulation, After demodulation of the signal to draw time-domain waveform and frequency spectrum, and comparative analysis.