Re: [Discuss-gnuradio] FFT of FFTs

2005-07-12 Thread James Cooley
10, 2005 4:18 PM To: James Cooley Cc: Eric Blossom; discuss-gnuradio@gnu.org Subject: Re: [Discuss-gnuradio] FFT of FFTs Any more suggestions on spotting periodic content? (as below?) Chiefly, can anyone think of something that I might be able to definitely pick out within TVRX range? -jamie

RE: [Discuss-gnuradio] FFT of FFTs

2005-07-12 Thread Weber, Michael J. \(US SSA\)
James Cooley > Cc: Eric Blossom; discuss-gnuradio@gnu.org > Subject: Re: [Discuss-gnuradio] FFT of FFTs > > > Any more suggestions on spotting periodic content? (as below?) > > Chiefly, can anyone think of something that I might be able to > definitely pick out withi

Re: [Discuss-gnuradio] FFT of FFTs

2005-07-10 Thread James Cooley
Any more suggestions on spotting periodic content? (as below?) Chiefly, can anyone think of something that I might be able to definitely pick out within TVRX range? -jamie James Cooley wrote: OK, I'm just getting around to trying these suggestions... First, re Eric's suggestions below.

Re: [Discuss-gnuradio] FFT of FFTs

2005-07-05 Thread James Cooley
OK, I'm just getting around to trying these suggestions... First, re Eric's suggestions below. A few quick questions about this. I'm interested in tuning to a frequency (with usrp/frontend) then examining a single stream for periodic content. I've tried this but not exactly sure what I'm seei

Re: [Discuss-gnuradio] FFT of FFTs

2005-06-18 Thread Frank Brickle
Eric Blossom wrote: Once you've got your individual streams of signals, for each one I would compute an estimate of whether it is occupied. Good suggestions. Elaborating on this a little, you might consider taking differences of successive magnitude or power spectra. If you're actually look

Re: [Discuss-gnuradio] FFT of FFTs

2005-06-18 Thread Eric Blossom
On Sat, Jun 18, 2005 at 08:18:38PM -0400, James Cooley wrote: > Hi all, > > I'm trying to take an FFT of an FFT Basically, I want to tune to a > signal, and for a given RF frequency, try to spot periodic usage of that > frequency. Is this possible? What I have now is hopelessly slow, so I'm

[Discuss-gnuradio] FFT of FFTs

2005-06-18 Thread James Cooley
Hi all, I'm trying to take an FFT of an FFT Basically, I want to tune to a signal, and for a given RF frequency, try to spot periodic usage of that frequency. Is this possible? What I have now is hopelessly slow, so I'm not really sure if I've got it right. My construct so far is like th