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基于实现无失真传输的条件，分析了信号传输过程中，选频网络群时延特性，阐述了群时延非线性引起相位失真的原因，以及对图像信号和数字信号传递的影响，介绍了一种用相位补偿电路，减少群时延非线性引起相位失真的方法。
Based on the realization of the condition of non-distorted transmission, the characteristics of the time-frequency-selective network in the signal transmission process are analyzed. The reasons for the phase distortion caused by the non-linearity of the group delay and the influence on the image signal and the digital signal transmission are introduced. The use of phase compensation circuit, reducing the group delay non-linear phase distortion caused by the method.