[LAU] audio meters nostalgia

[Fons Adriaensen]

On Sat, Apr 12, 2008 at 11:32:49PM +0200, Wolfgang Woehl wrote:

> > The VU meter measures the average of the absolute value of
> > the signal, 'average' meaning a second order filter that
> > reaches 99% in 300ms and overshoots between 1.0 and 1.5%.
> > It is calibrated to indicate 0dB for a sine wave at -10dB
> > w.r.t. digital full scale (which is +/-1 peak in this case).
> 
> Are these numbers modelled after a real device?

The VU meter is defined by ANSI, BS and IEC standards.
For the PPM there are BS and EBU standards.
The numbers quoted are those I learned long ago when I
was a student at the broadcasting and performing arts
academy in Brussels... Nostalgia indeed...

Ciao,

-- 
FA

Laboratorio di Acustica ed Elettroacustica
Parma, Italia

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