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I'm developing an application for PC that records microphone data in real-time, and plays it back after applying some effects.

I'd like to apply these effects only when a single known speaker is talking. The environment might include other people's voice and indoor noise (for example, a classroom or a restaurant).

Since that single speaker is also holding the microphone, I tried to simply filter input data based on a (configurable) volume level. This method is working but not very well, since sometimes the environmental noise might go above the threshold, or the speaker's voice might go below it.

Is there a better way to recognize a single speaker? I've read about speaker identification using feature extraction and HMM/GMM, but I'm not sure whether it is an overkill for my case.

I apologize if this it too vague. I'm new to DSP so I'm not really sure what additional information is needed to answer this. Thanks!


Edit:

  • Speakers usually speak one after another, but background chatter is possible.
  • In addition, although the speaker is known, I do need some kind of an initial setup procedure (to adjust the application to that speaker).
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  • $\begingroup$ I'm curious what kind of effects you're applying $\endgroup$ – endolith Apr 16 '12 at 16:17
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I was going to suggest the machine learning route but a quick search turned up OSS so you might not have to re-invent the wheel: Identify speakers with sndpeek

Do the speakers talk over each other (which complicates things) or is it mostly one after another?

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  • $\begingroup$ Thanks for the sndpeek suggestion. I've edited my question with more information. So the only alternative is to use machine learning? $\endgroup$ – kshahar Apr 15 '12 at 12:06

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