中文说明：语音增强的一个主要目标是从带噪语音信号中提取尽可能纯净的原始语音。然而，由于干扰通常都是随机的，从带噪语音中提取完全纯净的语音几乎不可能。在这种情况下，语音增强的目的主要有两个：一是改进语音质量，消除背景噪音，使听者乐于接受，不感觉疲劳，这是一种主观度量；二是，这是一种客观度量。这两个目的往往不能兼得。目前有一些对低信噪比带噪语音进行语音增强的方法，可以显著地降低背景噪声，改进语音质量，但并不能提高语音的可懂度，甚至略有下降。
English Description：
Speech enhancement as a major goal is to extract the pure original speech from noisy speech signal. However, due to interference are usually random, completely pure extract voice from noisy speech is almost impossible. In this case, speech enhancement has two main purposes: First, to improve voice quality, eliminating background noise, so that the listener willing to accept, do not feel tired, which is a subjective measure; the second is that this is an objective metrics. This serves two purposes often can not have both. There are some methods for low SNR noisy speech speech enhancement can significantly reduce background noise and improve voice quality, but it does not improve the intelligibility of speech, and even declined slightly.