Login / Register
 
Sample rate conversion & consolidate increases volume??
New Reply
Subscribe
D'Animation
Thread Starter
#1
28th February 2012
Old 28th February 2012
  #1
Gear addict
 
Joined: Nov 2009
Posts: 381

Thread Starter
D'Animation is offline
Sample rate conversion & consolidate increases volume??

Hi,

Excuse the cross-post on the DUC, not sure if this is related to a PT bug or the maths of sample rate conversion...

I've been doing lots of stem assemblies at 24fps, consolidating to one file and then converting to 23.98fps via sample rate conversion in the import session window. I've noticed that my peaks are ~1-1 1/2 db higher using the "find level" function on the Gain audiosuite plugin. Measuring the true peak via the Nugen VisLM plug, there's usually a .5 - 1db difference. Anyone come across this phenomena? Is it a bug or does the sample rate conversion change how peaks are read/alter the peaks somehow?
Pt8 HD 8.05, Mac OS 10.5.8
Thanks
#2
28th February 2012
Old 28th February 2012
  #2
Lives for gear
 
Joined: Feb 2007
Location: Stockholm, Sweden
Posts: 902

ErikG is offline
SRC as well as timstretching causes changes in measured dbfs peak levels. I don't know the math behind it but it does change.
__________________
Europa Sound & Vision
Euphonix 32 fader S5MC + stand alone MC, Nuendo x 9, Protools x 7
Dub stage with HD projection (13m throw), VVTR,
and a complete picture department with online, grading and more based on Mistika.
http://www.europasoundvision.se
#3
28th February 2012
Old 28th February 2012
  #3
Gear maniac
 
dmitri's Avatar
 
Joined: Oct 2007
Location: Moscow, Russia
Posts: 221

dmitri is offline
Yes, I've also noticed that SRC, time and pitch changes applied to stems always cause peaks higher than in the original file. I suppose this is much because the sound in the original file has undergone some dynamic range compression, and during SRC those compressed peaks are restored to some extent. Still, it's only my supposition.
__________________
Dmitri Chernov

rerecording mixer
http://www.imdb.com/name/nm2555539/
New Reply Submit Thread to Facebook Facebook  Submit Thread to Twitter Twitter  Submit Thread to LinkedIn LinkedIn  Submit Thread to Google+ Google+ 
 
Thread Tools
Search this Thread
Search this Thread:

Advanced Search
Similar Threads
Thread
Thread Starter / Forum
Replies
6777 / High end
69
matt9b / Music Computers
32
R'shonn / Geekslutz forum
3
checkers1811 / Music Computers
1

Forum Jump

SEO by vBSEO ©2011, Crawlability, Inc.