Based on the theory of four-end network, the equivalent electric circuit diagrams of the horn are given by using the analogous method between methanical force and electric.
依据四端网络的基本原理，利用力电类比的方法，给出了复合变幅杆的等效电路图；
Any cable television system can be regarded as a signal source, the preceding paragraph, transmission systems, end-user distribution network of four functional parts.
任何有线电视系统均可视为由旌旗灯号源、前段、传输系统、用户分派网四个功用局部构成。
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