小学期的源程序

1．试编MATLAB程序。信号 sinc(10*t),-2<=t<=2

　　m(t)=

　　 0,其它

用100hz的载波来产DSB信号并解调。完成下列工作：

画出已调信号；

求已调信号的频谱，并用图像表示。

画出解调信号；

求解调信号的频谱，并用图像表示。

　　2．信号

sinc2(100t),|t|≤t0

m(t)=

　　0, 其它



　　采用频率调制调制为1000HZ的载波。频偏常数为kf=50,t0=0.2。

　　注：（求和代替积分）

3．信号

2, t0/3>t>0

m(t)= -6, t0/3<=t<2*t0/3

0, 其它



t0=0.15,使用AM调制和包络检波解调.-Primary phase of source 1. Test procedures for MATLAB. Signal sinc (10* t),-2 < = t < = 2 m (t) = 0, the other with the 100hz signal carrier to the middle class and DSB demodulation. To complete the following tasks: Draw has been transferred signal　for the spectrum signals have been adjusted, and image representation. Draw demodulation signal　solving transfer spectrum signal, and image representation. 2. Signal sinc2 (100t), | t | ≤ t0 m (t) = 0, the other the use of frequency modulation of the carrier modulation for 1000HZ. Offset constant kf = 50, t0 = 0.2. Note: (sum in lieu of points) 3. Signal 2, t0/3>　t>　0　m (t) =-6, t0/3 < = t < 2* t0/3　0, other t0 = 0.15, the use of AM modulation and demodulation envelope detector.