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Re: [Discuss-gnuradio] Correct method for "compressing" a power spectrum
From: |
Marcus D. Leech |
Subject: |
Re: [Discuss-gnuradio] Correct method for "compressing" a power spectrum |
Date: |
Tue, 10 Mar 2009 14:43:33 -0400 |
User-agent: |
Thunderbird 2.0.0.19 (X11/20090105) |
Frank Brickle wrote:
>
>
> On Tue, Mar 10, 2009 at 11:10 AM, Marcus D. Leech <address@hidden
> <mailto:address@hidden>> wrote:
>
>
> OK, so I decided to use the averaging method, rather than the maximum
> method. It produces reasonably good looking plots:
>
> http://www.science-radio-labs.com/files/spectral_example.ps
>
>
> True, not bad. One surprise, though -- what's that notch around 1420.5?
>
> It definitely has an "averaged" look to it -- much like what you'd
> expect from time smoothing and not frequency necessarily. One thing
> that low-level heuristic grass might give you is a feeling that the
> relatively flat segments are alive at least, sort of like comfort
> noise during vocoder silence. If that matters.
>
> Frank
>
> --
> For an omnipotent and omniscient being, God has made some really lousy
> earthly staffing decisions. -- John Cole
The Fc is 1420.4058e6Hz, and since it's a direct-conversion receiver,
there's always a little spectral artifact near DC.
--
Marcus Leech
Principal Investigator, Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org
- Re: [Discuss-gnuradio] Correct method for "compressing" a power spectrum, (continued)
- Re: [Discuss-gnuradio] Correct method for "compressing" a power spectrum, Bob McGwier, 2009/03/09
- Re: [Discuss-gnuradio] Correct method for "compressing" a power spectrum, Marcus D. Leech, 2009/03/09
- Re: [Discuss-gnuradio] Correct method for "compressing" a power spectrum, Frank Brickle, 2009/03/09
- Re: Re: [Discuss-gnuradio] Correct method for "compressing" a power spectrum, rwmcgwier, 2009/03/10
- Re: Re: [Discuss-gnuradio] Correct method for "compressing" a power spectrum, Frank Brickle, 2009/03/10
- Re: [Discuss-gnuradio] Correct method for "compressing" a power spectrum, John Ackermann N8UR, 2009/03/10
- Re: [Discuss-gnuradio] Correct method for "compressing" a power spectrum, Marcus D. Leech, 2009/03/10
- Re: [Discuss-gnuradio] Correct method for "compressing" a power spectrum, Frank Brickle, 2009/03/10
- Re: [Discuss-gnuradio] Correct method for "compressing" a power spectrum, Marcus D. Leech, 2009/03/10
- Re: [Discuss-gnuradio] Correct method for "compressing" a power spectrum, Frank Brickle, 2009/03/10
- Re: [Discuss-gnuradio] Correct method for "compressing" a power spectrum,
Marcus D. Leech <=
- Re: [Discuss-gnuradio] Correct method for "compressing" a power spectrum, Marcus D. Leech, 2009/03/10
- Re: [Discuss-gnuradio] Correct method for "compressing" a power spectrum, Firas Abbas, 2009/03/10
- Re: [Discuss-gnuradio] Correct method for "compressing" a power spectrum, Marcus D. Leech, 2009/03/10
- Re: [Discuss-gnuradio] Correct method for "compressing" a power spectrum, Marcus D. Leech, 2009/03/10
- Re: [Discuss-gnuradio] Correct method for "compressing" a power spectrum, Marcus D. Leech, 2009/03/10
- Re: [Discuss-gnuradio] Correct method for "compressing" a power spectrum, Marcus D. Leech, 2009/03/09
- Re: [Discuss-gnuradio] Correct method for "compressing" a power spectrum, Brian Padalino, 2009/03/09
- Re: [Discuss-gnuradio] Correct method for "compressing" a power spectrum, Marcus D. Leech, 2009/03/09