Filter is a key unit of adjacent frequency channel synthesizer and coupling problem is a key point in the design of a filter.
滤波器是邻频频道合成器的关键部件之一，而耦合问题又是滤波器设计的关键。
A frequency translation circuit (172-188) abuts the multiple channel bandpass filtered analogue signals in the frequency domain without any guard bands between adjacent channel signals.
频率平移电路(172 ~ 188)使得经过带通滤波的若干多通道模拟信号在频域中接邻，而在相邻通道信号之间没有任何保护频带。
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