OT: S/N-Ratio measurment - help

[Tim Ressel]

The A-curve may be rubbish, but it is established rubbish, and it is important
for us to compare like measurements. I am reminded of the shady practice of
spec'ing peak power on amps to make them sound much more powerful then they
were. If you compare rms power, the amps sound similar. 

The National Semiconductor LM3915 Spec sheet shows a filter for a VU response. I
think that is an A-weighted response, but I am not sure.

Tim Ressel--Compliance Engineer
Hewlett-Packard
Verifone Division
916-630-2541  
tim_r1 at verifone.com                     



-----Original Message-----
From: Martin Czech [mailto:martin.czech at intermetall.de]
Sent: Thursday, February 10, 2000 12:38 AM
To: jorgen.bergfors at idg.se
Cc: synth-diy at mailhost.bpa.nl
Subject: Re: OT: S/N-Ratio measurment - help



:::I would say, you also need a filter to get an A-weighted frequency response. 
Do anybody know of a schematic for such a filter?
:::
:::/Jorgen
:::


The question was to find a "cheap" and "easy" method.
I recently found a text about why this a curve is 
rubbish altogether...


m.c.