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。
The key control point values were set up and the control object, Methods and frequency as well as the person in charge of control and error correcting measures were also determined.
对每一关键控制点分别制定出适宜的关键限值，明确规定了监控的对象、方法、频率、人员及纠偏措施。
Narrow band intermediate frequency digital receiver has been widely used in radar EW reconnaissance. At present, the high speed signal processing is the key point of its researching.
窄带中频数字接收机在雷达对抗侦察中得到了广泛应用，其高速信号处理技术是目前研究的重点。
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