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本文较详细地分析了在FM-FM双节目调频传输系统中,主节目信号可能对副节目信道产生串话的机理。指出,串话可能在基带处理过程及已调频射频波的传输过程中发生。还有可懂串话与不可懂串话之分。利用近似的准静态法,从总体上分析了由于射频传输系统非线性相频特性而造成的串话。文中分析了最简单的基带对射频载波进行调频产生的复杂频谱。提出了一个有助于分析问题的概念——传输系统对所应传输的频谱分量的振幅失真或相移失真,都可等效地看成对一个没有失真的原调频波,在失真的那一频谱分量的部位,从外界引入了一定的成分。本文还进一步指出,对上述复杂频谱中的每一频谱分量的失真(包括振幅失真)原则上都会导致可懂串话。
This paper analyzes in more detail the mechanism by which the main program signal may cause crosstalk to the secondary program channel in the FM-FM dual program FM transmission system. Pointed out that crosstalk may occur during baseband processing and transmission of modulated RF waves. There are understandable crosstalk and incomprehensible cross-talk points. Using approximate quasi-static method, the crosstalk caused by the nonlinear phase-frequency characteristics of RF transmission system is analyzed as a whole. In this paper, we analyze the complex spectrum generated by the simplest baseband modulation of RF carrier. Proposed a concept that helps to analyze the problem - the transmission system for the spectral components of the transmission should be the amplitude or phase distortion, can be equivalent to a distortion of the original unmodulated wave, the distortion of that The parts of spectral components, from the outside world introduced a certain composition. It is further pointed out in the paper that the distortion (including the amplitude distortion) for each spectral component in the above complex spectrum will in principle lead to understandable crosstalk.