Re: 3 dB bandwidth

Adrian Tuddenham wrote:

> Pooh Bear <rabbitsfriendsandrelations@xxxxxxxxxxx> wrote:
>
> > Adrian Tuddenham wrote:
> >
> > > Pooh Bear <rabbitsfriendsandrelations@xxxxxxxxxxx> wrote:
> > >
> > > > Bell Labs definition is *not* the standard. Trading Standards would
> > > > laugh at an attempt to refer to it.
> > > >
> > > > The standard is set by the AES.
> > >
> > > Could you let me have the name or number (or URL) of the standard you
> > > are referring to.
> >
> > AES-R2-2004 - also see the referenced IEC standards.
> >
> > http://www.aes.org/publications/standards/courtesy.cfm?ID=9
>
> Thanks, I'll see if I can get hold of a copy - unless you can just post
> the relevant re-definition of the decibel from your own copy.

Hmmmm.... As an AES member I *cannot* re-distribute internal documents sadly
( even for educational purposes ) without prejudicing my member status.

If you visit the AES site there are a number of documents that are
downloadable pdfs on a 'complimentary' basis however.


> > Abstract:
> [...]
> > The original document of 1998 was revised
> > 2004-02 to delete considering the adoption of 1 V as the reference
> > quantity for new work in audio engineering.
>
> Interesting.... So 1V was never adopted as the reference and isn't
> being considered any more.

For the same reason it was rejected back around 1974. Namely commonality with
established practice.

If there was any time to make a change it was *then* ! Leaving it decades
later was preposterous ! I guess they had to revisit the concept and rejected
it for the same reasons as before.


Graham

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