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,
self.fft_size,
-20*math.log10(self.fft_size)
-10*math.log10(power/self.fft_size)
)
The variable power is a square of amplitudes, which is a power value, so
-10*math.log10(power/self.fft_size) is correct.
Patrick
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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