系统不能精确地匹配输入和输出的情况。电子放大器就是一个非常普通的例子，另外还有家庭立体声音响放大器。
The inability of a system to exactly match input and output, a general example being an electronic amplifier and the classic example being a home stereophonic amplifier.
主要讨论了据此概念而导出的一种新概念放大器，这种放大器的性能远优于普通分市式放大器。
This paper, in accordance with the concept of the transmission line traveling wave matching and the theory of the distributed amplifier, describes a new concept amplifier which is cascadable.
本发明涉及一种用交流电的电子音乐门铃，由普通电子门铃加整流电源、继电器及功率放大器构成。本发明不再需要电池供电。
This AC electronic music door bell is composed of general electronic door bell, rectified power supply, relay and power amplifier and does not need battery to power it.
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