[Scott Dorsey]

Eric Jacobsen wrote:
On Sun, 21 Nov 2010 08:46:10 -0500, Mike Rivers
wrote:

As commonly used today, dB without any modifiers is usually
understood to be sound pressure level referenced to a
specific pressure in Pascals.

I think this is exemplary of one issue. This may be true in your
area of work, that dB without a modifier has to do with sound
pressure, but in communications dB without a modifier is generally
representative of a unitless scale factor in a system. e.g., an
amplifier that increases the signal power by a factor or ten has 10dB
of gain. If 0dBW goes in, 10dBW comes out, if 0dBm goes in, 10dBm
comes out.

I believe that Mike is incorrect in this. Some people DO use "dB" to
mean "dBSPL." However, those people are wrong.
--scott


--
"C'est un Nagra. C'est suisse, et tres, tres precis."