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任何信号中都有噪声,或者说噪声无所不在。当信号很强时,噪声被信号所淹没。当信号很弱时,噪声就现出来了。对音频信号而言,语言和音乐都经常有间歇或停顿。这时噪声就突出出来。噪声门可抑制信号很弱或停顿时的信源背景噪声。可用于吉他或其他乐器的演凑,也可以用于其他场合。 噪声门的电路很简单(见图1),它由一个集成双运放BC548B组成。其中一半ICla组成受信号控制的可变增益放大器,另一半IClb组成控制放大器。二级管D4,D5对IClb放大后的信号进行整流。整流后的电压控制晶
There is noise in any signal, or noise everywhere. When the signal is strong, the noise is submerged by the signal. When the signal is weak, the noise comes out. For audio signals, the language and music are often intermittent or pause. At this time the noise is outstanding. The noise gate can suppress the source background noise when the signal is weak or pause. Can be used for guitar or other musical instruments, can also be used for other occasions. The noise gate circuit is very simple (see Figure 1), which consists of an integrated dual op amp BC548B. One half of ICla consists of a signal-controlled variable-gain amplifier and the other half of IClb forms the control amplifier. Diode D4, D5 to IClb amplified signal rectification. Rectified voltage control crystal