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组合音响为了降低节目信号中的噪声,提高信噪比,大多采用自动降噪电路。自动降噪电路是利用人耳的掩蔽效应,当信号强度比噪声强度大到一定程度后,可以用信号声掩没噪声。人耳对低频的噪声不敏感,故降噪电路主要是降低高频段噪声。该电路有两种形式:一种是互补型降噪系统,专门用于录音座,在录音和放音时对信号进行提升和压
Combination of audio In order to reduce the noise in the program signal, improve signal to noise ratio, mostly automatic noise reduction circuit. Automatic noise reduction circuit is the use of the human ear masking effect, when the signal strength is greater than the noise intensity to a certain extent, the signal can be used to cover up the noise. The human ear is insensitive to the low frequency noise, so the noise reduction circuit mainly reduces the high frequency noise. The circuit has two forms: one is a complementary noise reduction system, designed for recording base, the signal during recording and playback to enhance and pressure