From: John Woodgate
Subject: Re: Audio noise in diff amps
Date: Sat, 21 Dec 2002 08:33:30 +0000
Organization: JMWA Electronics Consultancy
Reply-To: John Woodgate
NNTP-Posting-Date: Sat, 21 Dec 2002 10:15:10 +0000 (UTC)
X-Newsreader: Turnpike (32) Version 4.01 <5Z8C9wtxbnpWyFnyfFzqmVF739>
I read in sci.electronics.design that Don Pearce
wrote (in <email@example.com>) about 'Audio
noise in diff amps', on Fri, 20 Dec 2002:
>On Fri, 20 Dec 2002 19:49:57 +0000, John Woodgate
>>I read in sci.electronics.design that Glenn Gundlach
>> wrote (in >ogle.com>) about 'Audio noise in diff amps', on Fri, 20 Dec 2002:
>>>Agreed on the dbm vs dbu.
>>Well, after all the argy-bargy, you still haven't twigged that the
>>symbols are 'dBm' and 'dBu'! The bel is a 'named' unit, so its symbol
>>(but not the unit name) is in upper case.
>Oops! Neither the Bel nor the deciBel is a unit. In this case the m or
>the u is the unit - the dB bit is simply a chunk of maths to express a
The bel is in all lists of 'units' I have here, including IEC and AES
lists. So is the neper. I agree that they are 'units' of a different
nature from length, mass etc. Irrespective of that, the official
standard IEC/ISO/ITU symbol is 'dB', not 'db'.
Regards, John Woodgate, OOO - Own Opinions Only. http://www.jmwa.demon.co.uk
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