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安装在用户家中的有线电视终端盒上的两个插孔:一个是提供给电视机使用的TV插孔;另一个是从前端来的信号中分出调频广播信号的FM插孔。这种用户终端盒的电路图如1所示。传输电视信号的通路是由C1、L1、C2、L2,C3、L3,组成的带阻滤波器,让电视信号通过,并对非频带内的信号进行大
Two jacks installed in the cable box of the subscriber’s home: one is a TV jack for television use and the other is a FM jack for separating the FM broadcast signal from the front end. This user terminal box circuit shown in Figure 1. The path for transmitting the television signal is a band-stop filter composed of C1, L1, C2, L2, C3, L3, allowing the television signal to pass through and amplifying the signal in the non-band