Re: True RMS value for audio samples
Re: True RMS value for audio samples
- Subject: Re: True RMS value for audio samples
- From: Luigi Castelli <email@hidden>
- Date: Mon, 9 Jul 2007 10:59:05 -0700 (PDT)
Thanks B.J. and Steve,
in response to Steve:
Yes, to
speed things up, I thought of doing a moving average like you
suggested, however what kept me from going ahead and implementing it,
is the concern that - doing it that way - I am gonna encounter
round-off error problems really soon, because I am performing 44100
additions and 44100 subtractions per second on the same number.
What's your take on that ?
in response to B.J.:
first of all - I love SpectraFoo. Congrats for writing such a brilliant app.
second - could you please elaborate on your statement:
"You need to compute the true RMS with the moving average and then use that to drive your meter attack and release data."
If
I implement a moving average window then it doesn't make sense to talk
about attack and release because the attack and release times will be
given to me implicitly by the length of the window (i.e. the amount of
averaging). How could I still have an attack and a release time
independent from each other in a moving average implementation ? Also
how am I to determine the optimal length of the window ?
- Luigi
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