Re: 3 dB bandwidth

Don Bowey wrote:

> On 6/28/05 11:52 PM, in article
> 1gywp96.nm3oeczrw7bwN%poppy.uk@xxxxxxxxxxxxxxxxxxxxxxxx, "Adrian Tuddenham"
> <poppy.uk@xxxxxxxxxxxxxxxxxxxxxxxx> wrote:
>
> > Pooh Bear <rabbitsfriendsandrelations@xxxxxxxxxxx> wrote:
> >
> >> 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.
> >
> > So the re-definition of the decibel is an internal document?
> >
> > I think the time has come to draw this nonsense to a close before you or
> > Kevin tell us that the volt and ampere have also been re-defined to suit
> > the convenience of audio engineers.
>
> The document is Internal to the AEC. This is common for working documents
> within standards bodies.
>
> I downloaded the courtesy copy and looked around the AEC pages. It appears
> to be a professional organization, but I don't see any ANSI, or other
> affiliation, which bothers me a lot.
>
> However, the AEC is taking into account definitions used by some Standards
> bodies (but perhaps not all), and appears to NOT be setting new definitions,
> but providing *guidelines* for the AEC member organizations use of the
> expressions. Guidelines are NOT standards, so where's the problem except
> between the parts of the audio industry who do and do not belong to the AEC?
>
> Don

Aside from its contributions to the accepted standards bodies, the AES - not the
atomic energy commision btw ;-) - publishes 'guides for recommended practice'.

This is in effect a statement of accepted ( and preferred ) usage.

Graham


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