Changing speed of groove~ also changes volume ?

May 26, 2010 at 10:08am

Changing speed of groove~ also changes volume ?

Hi there,

It may seem as a newbie question but I have a weird feeling this morning.
When I change the speed of a groove~ object by sending a 2 to a sig~ I feel the volume is louder than the original speed.
Is it just a feeling or is it an natural acoustic fact ?
And is there like a mathematical relation between speed and volume in order to keep the same volume while changing speed ?

thanks a lot

#50571
May 26, 2010 at 11:58am

there is a relation between pitch and loudness, but the factor depends on the
material and is not predictable.

just make some tests and find your personal value for lowering the gain (with
the desired effect on the percepted loudness) like say, -3db/A per octave …

-110
 

#181435
May 26, 2010 at 12:47pm

thanks for your reply Roman
I will measure it with my material
but does it mean it is going to be a different factor if I play on another PA ?
thanks

#181436
May 26, 2010 at 2:13pm

I think that this “material” Roman’s talking about is not your speakers but the samples you’re using. But I’m maybe wrong.

#181437
May 26, 2010 at 2:45pm

I think he’s referring to this: http://en.wikipedia.org/wiki/Robinson-Dadson_curves

#181438
May 26, 2010 at 2:47pm
#181439
May 26, 2010 at 2:48pm

oops, looks like we had the same idea. ish..

#181440
May 26, 2010 at 6:50pm

very interesting readings…
thanks guys !
that’s exactly what I was looking for

#181441
May 27, 2010 at 1:23am

fletcher munson, no not exactly what i was thinking of.
because it wont really work for broadband audio like say, a piano sample or a drumloop.

#181442
May 28, 2010 at 7:40pm

if you know the playback volume, maybe you could use a weighting-filter to calculate the perceived loudness and compensate for that…??

http://en.wikipedia.org/wiki/Weighting_filter

#181443

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