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Re: [Discuss-gnuradio] The power of N log N
From: |
Lamar Owen |
Subject: |
Re: [Discuss-gnuradio] The power of N log N |
Date: |
Tue, 14 Jun 2005 08:54:34 -0400 |
User-agent: |
KMail/1.8.1 |
On Monday 13 June 2005 16:36, Eric Blossom wrote:
> Matt and I had quite the hack-a-thon over the past few days.
Yeah, been tracking CVS on a machine here, and noticed a load of differences.
One quick question: now that tweak_adc_offset is no longer in the repository,
is the ADC DC offset automatic? I still see a DC spike in the FFT output.
> * Support for large FFT's
In the large FFT case, I notice that the resulting trace is significantly
thicker, and it doesn't seem to average out. I'll have to look, but an
'fft_smoothing' argument (to thin the trace) would be what I'd need to get
the resolution I need.
> * The FFT sink display is now normalized by the number of bins, so
> that changing the number of bins doesn't change the displayed result.
Yes, it's nice to see 0dB and negatives again.
> * All the examples were examined and all calls to fftsink were
> changed to use the new prefered keywork argument form. This makes
> available additional functionality not accessible through the legacy
> interface. Details of the new interface are in fftsink.py
Have to look at this, since my code is based on a previous usrp_fft.py.
You forgot the PowerMate control capabilities in the tvrx examples, as well as
the tvrx cleanup.
--
Lamar Owen
Director of Information Technology
Pisgah Astronomical Research Institute
1 PARI Drive
Rosman, NC 28772
(828)862-5554
www.pari.edu