过取样的空闲信道噪声及其消除

在数字音频技术中，过取样可以降低量化噪声，但却带来一种新的噪声，即空闲信道噪声。本文叙述空闲信道噪声的产生过程，以及有要用加上抖晃信号以消除空闲信道噪声的方法。并以数字调幅发射机为例来说明抖晃信号的应用。

The Idle Channel Noise of Oversampling Process and its Elimination

In digital audio technology, oversampling can reduce quantizing noise,but a new noise,idle noise is produced during the oversampling process,andit can be eliminated by adding a dither signal into the processed signal.This dither used in the digital AM fransmiffer is also described as an application example.