1
$\begingroup$

Here i will first try to put my application agenda

Typically i am sampling at 8Khz rate and filtering speech components using a BPF(digital) now i have got the 0-4Khz components in which essentially <250Hz are not speech so i will eliminate them also now i am trying to find out entropy of frame and trying to mark respective frames as voice or non voice if they belong to band 250<=f<=3750 Hz

so now the problem is while i was doing this at my realtime application side there also non human sounds like birds sound or a ringing of a bell which again fall in to the frequency band i am flagging as speech

so this causes a false alarm of speech even in case of bird sound and bell ringing how to really over come this problem

what else i can try to do for effectvie speech activity detection

Improve this question
$\endgroup$
3
  • $\begingroup$ I suggest you to remove aliasing from the title of your question, since this phenomenon does not seem to be involved here. $\endgroup$ – pichenettes Sep 30 '13 at 8:35
  • $\begingroup$ if its not aliasing then what it is aliasing is when a high freq(greater than nyquist ) are been sampled, the components appear in existing band after the phenomenon of aliasing isn't it ? same seems to happening here a diff freq bird sound is appearing in speech region obviously looks aliasing for me $\endgroup$ – kakeh Sep 30 '13 at 9:09
  • 2
    $\begingroup$ You are correct about your definition of aliasing but this is not what is happening here. Birds or bell sounds simply do have frequency components in the 250-3750 Hz band. $\endgroup$ – pichenettes Sep 30 '13 at 9:10
2
$\begingroup$

This is not aliasing this is not any phenomenon, there are number of birds whose vocal fall in speech range even a frog vocal falls in speech range so essentially a training based speech detection is required to classify whether a given frame is speech or a non speech

one such implementation is shown here

Speech Discrimination based on multiscale spectro temporal modulations

Improve this answer
$\endgroup$
0

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.