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How to decipher this Adaptive algorithm used for Voice Activity Detect, Unable to understand this VAD algo
shyam.sunder91
post Nov 12 2013, 07:56
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Recently in the task of implementing a adaptive energy algorithm for VOICE ACTIVITY DETECTION ,i came across an algorithm which is working properly and well but the problem is i am not able to understand the algorithm in the phase of updating the threshold value,can any one point out why the threshold is increased with a logarithm step, how the threshold is affected if the Emin decreases

Algorithm - source of VAD algo



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Alexey Lukin
post Nov 12 2013, 08:36
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There should be no logarithm, just k * E_min.
You'd better ask the author.
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shyam.sunder91
post Nov 12 2013, 09:41
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QUOTE (Alexey Lukin @ Nov 12 2013, 13:06) *
There should be no logarithm, just k * E_min.
You'd better ask the author.


the author has never replied smile.gif it must be having some relation or may be it was giving him more good results by using a log than actual value but there must be a reason for it any one there to explain the mathematical suspense in it
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AstralStorm
post Feb 12 2014, 07:31
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The log is likely an approximation to the speech probability/energy distribution. It's actually even closer to gamma distribution, which some other algorithms use, such as various MMSE noise suppressors.
For example, ones written by prof. Israel Cohen: http://webee.technion.ac.il/Sites/People/IsraelCohen/

This post has been edited by AstralStorm: Feb 12 2014, 07:33


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