Re: The truth about decibels

Don Bowey wrote:

> On 6/29/05 1:29 PM, in article 42C304B5.89046EC4@xxxxxxxxxxx, "Pooh Bear"
> <rabbitsfriendsandrelations@xxxxxxxxxxx> wrote:
>
> > Adrian Tuddenham wrote:
> >
> >> Pooh Bear <rabbitsfriendsandrelations@xxxxxxxxxxx> wrote:
> >>
> >>> tlbs wrote:
> >>>
> >>>>> Pooh Bear wrote:
> >>>>> 1. A measuring system first used in telephony (Martin, W.H., "DeciBel --
> >>>>> the new name for the transmission unit. Bell System Tech. J. January,
> >>>>> 1929), where signal loss is a logarithmic function of the cable length.
> >>>>
> >>>> I have actually read that original paper by Martin. I have also read
> >>>> another white paper with comments similar to your own, and have tried
> >>>> (in my own circle of influence) to educate people about the proper use
> >>>> of the dB.
> >>>
> >>> The relevant 'education' is now adopted by the AES ( Audio Engineering
> >>> Society
> >>> ) who write the standards on this matter. Their standards are adopted by
> >>> bodies such as the IEC, ANSI and ISO
> >>
> >> From the reference you provided in the "3dB Bandwidth" thread:
> >>
> >> <http://www.aes.org/publications/standards/courtesy.cfm?ID=9>
> >>
> >> ...it is abundantly clear that the AES does *not* write the standards.
> >> They adopt the standards of the IEC etc. and then publish documents
> >> explaining them to their membership.
> >
> > The AES is represented on an official basis on the Working Groups.
>
> Are you *certain* of that?

Yes ! Indeed our own esteemed John Woodgate 'sits' on many of the working groups
as a recognised representative of the AES ( and other bodies ) as I understand it.
He has also represented other professional bodies such as PLASA too. The
Professional Sound and Lighting Association based in the UK. Basically us
'fuckwits' that *do* rock 'n roll concerets. I guess that offends your rarified
1929 Bell Labs concept of what engineers are meant to do and I'm sure you would
disapprove !

http://www.plasa.org/

And of course I was my client company's offficial link with Plasa's Standards
section too !

Talking of which...... John should be back soon. He said he had some important
Standards work that would interrupt his contribution here but I expect he'll be
back soon. I'm sure he said June or July.

> I bet the governing body is the AES, and the
> Working Groups work under the AES.
>
> > The are also *audio specific* standards that the AES develops that are then
> > formally
> > adopted by the well known standards bodies. Not the other way round.
>
> The AES "standards" may or may not be adopted by other standards bodies.

Agreed. If the standards bodies agree that useful work has been done they may well
choose simply to adopt the industry norm. The AES is good at this.

> > Semantics.
>
> Important, meaningful semantics.
>
> The AES is NOT issuing a "standard" having new definitions. What you
> have been saying is NOT CORRECT.
>
> Weasel-word around it all you want, but it won't change the facts.

Suit yourself. My patience is wearing thin and I really can't be too bothered with
clowns who aren't interest in reality.

Graham

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