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作为综合性音响乐器,电子琴必须产生多种声响信号;例如上键盘和下键盘演奏时模拟各种乐器和人造声响的电信号、打击乐音响信号、模拟空间回响的延迟音信号等等。这些信号需要在送入主放大器之前进行混合,并要从乐理上考虑相互强度比例、调整方法以及适当的注入信号混合的位置等。设计电路时不考虑这些,会给演奏者带来不便,甚至无法成功的奏出乐曲。电子琴加工的电信号十分繁杂,信号支路很多,切换电位器和开关布满控制盘,互相感应的“营、营”声极难根除,因此必须加设静噪装置。电子琴的放大器要有足够的频带和足够的功率输出,要有宽裕的功率动态范围。本文将叙述这些问题。
As a comprehensive sound instrument, the keyboard must produce a variety of acoustic signals; such as the upper keyboard and the lower keyboard to simulate a variety of musical instruments and artificial sound of electric signals, percussion sound signals, analog space echo echo signals and so on. These signals need to be mixed before being fed into the main amplifier and should be rationally accounted for by the mutual intensity ratio, the method of adjustment, and the location of the appropriate injection signal mix. Designing the circuit without regard to it can cause inconvenience to the player and can not even successfully play a piece of music. The electrical signals processed by the keyboard are very complicated. There are many signal branches. Switching potentiometers and switches are full of control panels. Mutual induction of “battalion and battalion” is very difficult to eradicate. Therefore, a mute device must be added. The keyboard amplifier to have sufficient frequency band and sufficient power output, have ample power dynamic range. This article will describe these issues.