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[Discuss-gnuradio] Re: factors for gr.nlog10_ff [was: output of gr.argma

From: Patrick Strasser
Subject: [Discuss-gnuradio] Re: factors for gr.nlog10_ff [was: output of gr.argmax & gr.max]
Date: Wed, 12 Mar 2008 15:38:26 +0100
User-agent: Thunderbird (Windows/20080213)

Tim Meehan wrote am 2008-03-12 11:28:

BTW I sent a message to this list the other day questioning the "-20*math.log10(self.fft_size)..." in the line below (taken from your code above). I argue it should be "-10*math.log10(self.fft_size)..." [from Brook Lin] self.fft_size,-20*math.log10(self.fft_size)-10*math.log10(power/self.fft_size))

It is:

for tap in mywindow:
    power += tap*tap
self.log = gr.nlog10_ff(20,

The variable power is a square of amplitudes, which is a power value, so -10*math.log10(power/self.fft_size) is correct.


Please do not top quote/full quote. See http://gnuradio.org/trac/wiki/MailingLists#Guidelinesforposting
Engineers motto: cheap, good, fast: choose any two
Patrick Strasser <patrick dot strasser at tugraz dot at>
Student of Telematik, Techn. University Graz, Austria

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