Re: [Audacity-nyquist] Statistical analysis (and hello)

[Alex S. B. P. <ale...@al...>]

I did a silence-detection plug-in which is now included in the regular 
Audacity distribution. That required me to look at some very basic noise 
detection issues. I did not have to do the statistical analysis, because 
I just looked at areas of the signal that exceeded or fell below a set 
threshold.

You could look at my plug-in for help. I found one of the hardest parts 
of writing it was being careful not to accumulate all the samples in 
memory. If you do, then your memory use quickly skyrockets for anything 
more than a very short sound wave.

Your first step should be to look at the built-in functions to 
manipulate the signal. If you can find a way to reduce the number of 
samples you have to read, you will get a result much more quickly.

If you need specific advice, let us know more about the math of your 
calculation and how it is typically done, and we might be able to guide 
you towards some useful built-in functions or programming models.

--Alex

George Jenner wrote:
> Hello,
>
> I was just searching the archives to see if I could do some 
> statistical analysis of recordings.  I see Edgar recently published an 
> A-weighting filter and I've succesfully runi it as my first plug in.  
> (Sorry I've only just joined the list so I only know you by the 
> archives).
>
> At work I'm using audacity to measure noise levels, so I wonder if 
> this has been done before.  I'd like to determine L10, L90 and Leq of 
> a sample.  For those of you whose jobs are more interesting than mine, 
> L10 is the level which is exceeded by 10% of all samples.
>
> Has this been done by anyone?  Lisp is a foreign language to me so 
> I'll need some time to get used to it.
>
> Thanks for any help,
> George

-- 
Alex S. Brown, PMP
ale...@al...
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