I once used a pll to respond to sonar signals in noise, it worked with a
signal 6db lower than the noise. on a scope you could not even see the
signal in the noise, and this was with no extra filtering.

----- Original Message -----
From: adastra <foster@ADASTRAN.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Friday, August 03, 2001 3:17 AM
Subject: Re: [EE]: Amplify then filter ?


> >
> > If the 12KHz band actually has the lowest amplitude of any of the bands,
I
> > would invert the signal with an op amp configured as an inverting
> > amplifier
> > and then apply it to the LM567s. This would then give the 12KHz band the
> > highest amplitude, otherwise, I would proceed with Jim's
recommendations.
> >
> >
>
> You're kidding... Right?
>
> --
> http://www.piclist.com hint: The PICList is archived three different
> ways.  See http://www.piclist.com/#archives for details.
>
>

--
http://www.piclist.com#nomail Going offline? Don't AutoReply us!
email listserv@mitvma.mit.edu with SET PICList DIGEST in the body