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[求助] 如何把不清楚的音频文件变清楚?

各位大虾,i ask for you help!
  im attending an English training course these days. The audio file played at the class was at low quality, say, the low frequency part are somewhat blurred or mixed up, and there is harsh when the tone is high. In fact the audio was recorded, as i inferred, on magnetci tapes at nineties last century, thus no odd for its bad effect. Since i am doing image recognition, sort of related to signal processing, i volunteered to make an update of the audio file for the teacher. But it comes to me revealing quite a lot topics like frequency response, filtering, mininum phase system etc. that i feel i need to study much for a solution. i tried with some audio editor tools, say CoolEdit, to touch up, with a little improvement though, but still not satisfying. i attched the original file and the updated file 5.mp3 herein, so could anyone be kind enough to give a hand on it. Thanks in advance.
ps, forgive me for any typo above.
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  • 附件 1 : 中听Unit05.mp3
  • 2012-07-10 10:05:09, 12.61 M
  • 附件 2 : 5.mp3
  • 2012-07-10 10:05:46, 16.81 M

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