[PD] vu-meter question

Derek Holzer derek at umatic.nl
Tue Aug 5 20:27:50 CEST 2008

Maybe the difference between RMS and peak-to-peak dB levels?


Martin Peach wrote:
> Frank Barknecht wrote:
>> For example as in the attachment.
> Interesting playing with that...If you give the osc~ a gain of 100dB, 
> which dbtorms translates to a gain of 1, then [env~] outputs 96.99dB and 
> the vu meter -3dB. To get 0dB on the meter you need to give 103dB to the 
> osc~, a gain of 1.413.
> My onboard soundcard starts clipping with the vu meter at -3dB, so a 
> gain of 1 on an osc~ is the maximum the hardware can handle.
> That is, maximum gain allowed by the hardware is 100dB ("sound pressure 
> level"), 1 ("full scale"), or -3dB (why not 0dB?).
> Why does env~ give an output that is 3dB less than, or 1/2 of, its input?
> Martin
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derek holzer ::: http://www.umatic.nl ::: http://blog.myspace.com/macumbista
---Oblique Strategy # 105:
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