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JohnVo
JohnVo
Inspiring
May 16, 2017
Answered

calculate entire RMS of an audiofile ,are audio statistics accurate?

  • May 16, 2017
  • 1 reply
  • 3320 views

hi

about are the audtio statistics of an entire audio file accurate ?

reading a forum about it , i have read

it's impractical to calculate the true RMS of the entire file, so most algorithms do some time-windowing and take an average-of-RMS values (or maybe an RMS-of-RMS values if that makes sense mathematically). So... two different applications may report two slightly different RMS values.

&

and, the average may  also be an average-of-averages over the length of the file.

is it true?

thanks

This topic has been closed for replies.
Correct answer SteveG_AudioMasters_

Giovannivolontè  wrote

 

is it true?

Yes.

Now what?

1 reply

SteveG_AudioMasters_
Community Expert
SteveG_AudioMasters_Community ExpertCorrect answer
Community Expert
May 16, 2017

Giovannivolontè  wrote

 

is it true?

Yes.

Now what?

JohnVo
JohnVoAuthor
Inspiring
May 17, 2017

it's impractical to calculate the true RMS of the entire file

&

Yes.

Now what?

hi

so audtio statistics is almost unless

i use to find out the peak amplitude & the minimum rsm ampliture

these value are misleading aren't they?

for example i working on this audio , i watch the value with the red arrows

sIJ6xi3.png

thanks

JohnVo
JohnVoAuthor
Inspiring
May 17, 2017

No they aren't. The errors are so small as to be audibly imperceptible. Just because they are there, it doesn't in the slightest mean that they are significant. We are talking about small fractions of a dB here, and your ears can't realistically distinguish a 1dB level shift, never mind anything smaller.

On top of that, this only becomes significant if you scan a large section of a file - and information gleaned from this about averages is pretty useless anyway, never mind how accurate it is or isn't. The only things you need accuracy about, Audition calculates accurately anyway. So if you want to normalize waveform so that the highest peak hits a specific value, then this is very accurately determined, and it works absolutely fine.

What do you need this information for, anyway?


hi

i use to fix manually clipping , noise (speech records ) and son

i use to add markers and work on them

may i know Steve if you use and when?

thanks SteveG

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