杂音设计是模拟载波通信系统制式设计的中心问题。二线双带传输制通信系统中的交调杂音计算较四线单带制通信系统更为复杂。本文着重分析前者的交调杂音,推导实用的交调杂音的分布系数,指出主要产物的类型,并对交调的累积规律进行一般性分析。 Noise design is the center of the analog carrier communication system standard design. The crossover noise calculation in the two-wire dual-band transmission system is more complicated than the four-wire single band communication system. This paper focuses on the analysis of the former intermural noise, deduces the distribution coefficient of practical intermural noise, points out the types of the main products, and analyzes the general rules of the intermodulation.