Seeking a simple audio energy detection algorithm
in [DSP]
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From: Mikolaj on 3 Nov 2009 06:22 Dnia 03-11-2009 o 10:21:28 Ury <ujamshy(a)yahoo.com> napisa�(a): >>> >>> >>> Ury wrote: >>> >>>> Hi, >>>> >>>> I receive a stream of linear 16 bit audio and need to identify the >>>> possibly "interesting" parts vs. plain silence or noise. >>>> >>>> Just computing the average energy and comparing to a threshold is not >>>> sifficient since there may be a background noise. >>>> >>>> Is there a lightweight adaptive energy detection algorithm? >>> >>> A very generic way is compare the long term average to the short term >>> average. >> >> While that is the typical way of expressing the idea, I think "long > term" >> confuses the beginner. I think its more descriptive to say you need to >> compare the medium term average with the short term average. In other > words >> look for surges in the energy above the gently rolling changes typical > of >> background noise. >> >> Steve >> >> > > What are typical durations for medium term and short term? > > Thanks, > Ury. 1 and 10 -- Mikolaj |