The Audio Enhancement merely means making the non-noisy audio noise better. In order to separate the various tools in our computer software items into basic groups, with Audio Enhancement and Noise Reduction being two of them. In this paper, the review has shown different audio enhancement techniques. These techniques tried to detect noises as well eliminate noises in order to enhance the audio signals. It may maybe not be worried about the "true" noise from the famous perspective, rather, what makes our ears happy. Or, we could need to adjust the overall noise of the taking in order to obtain it to noise more natural.