[Boatanchors] decibels (was Microphone Output)

[Richard Knoppow]

----- Original Message ----- 
From: "Bry Carling" <bcarling at cfl.rr.com>
To: "Richard Knoppow" <1oldlens1 at ix.netcom.com>; "Richard 
Knoppow" <1oldlens1 at ix.netcom.com>; "Al Klase" 
<ark at ar88.net>; <boatanchors at mailman.qth.net>
Sent: Friday, January 11, 2013 11:41 AM
Subject: Re: [Boatanchors] decibels (was Microphone Output)


> Great description.  Thanks.  Various industries and 
> individual companies have used a variety of definitions 
> for line level also. Sometimes +4dbm instead of +8 dbm.  I 
> think a few folks even used +10 dbm at times.
>
> YMMV
> Bry,  AF4K

    There is a good article on Wikipedia with a link to the 
original Chinn, Gannet, and Moris paper.

http://en.wikipedia.org/wiki/VU_meter

The paper is at:

http://www.aes.org/aeshc/pdf/chinn_a-new-svi.pdf

     For papers published in the Bell System Technical 
Journal see:

http://www.alcatel-lucent.com/bstj/#1922

http://www.alcatel-lucent.com/bstj/vol08-1929/bstj-vol08-issue01.html

Decibel adopted as name for the Transmission Unit

     A perusal of the issues between 1922 and the early 
1930s will convince you there is little new under the sun.


--
Richard Knoppow
Los Angeles
WB6KBL
dickburk at ix.netcom.com