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发明背景本发明与调频系统有关,更详细地说,与发射信号中含有直流分量或低频分量的单边带调频系统有关。在以前设计的单边带调频系统中,输入信号被分开并分别加到两个移相电路,两个移相电路分别将各个信号分量的相位彼此移动90°,其中的一个相移电路的输出通过一个积分器及指数函数发生器而加到调幅器;另一个移相电
BACKGROUND OF THE INVENTION The present invention relates to frequency modulation systems, and more particularly, to single sideband frequency modulation systems that contain a direct current component or a low frequency component in a transmitted signal. In the previously designed single-sideband FM system, the input signals were separated and added to two phase-shift circuits, respectively, and the two phase-shifted circuits shifted the phases of the respective signal components by 90 ° from each other, respectively, and the output of one of the phase-shift circuits Through an integrator and exponential function generator and added to the amplitude modulator; the other phase shift power