audio noise reduction

I have one doubt regarding audio processing for noise reduction. I开发者_运维技巧s there any free ware and share ware DLLs available for noise reduction in .wav audio files or any sample codes using c#, vb.net or vb?

---

SoX is a cross-platform command-line application that does audio manipulation. A quick check of the man page reveals that it can do noise reduction (see noiseprof and noisered).

You can use trim in combination with noiseprof to choose a small clip of a larger audio file to use as the noise.

---

there are different meanings of "noise reduction". a simple implementation is a noise gate, which mutes the audio when the amplitude goes below a threshold. this is good enough for many applications. but a more sophist aced approach wouldcbe to do some frequency-domain analysis, w which is much less trivial. depending on your needs, the first approach is simple enough to roll your own. ymmv.