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[Discuss-gnuradio] fft display frequency spotting
From: |
cswiger |
Subject: |
[Discuss-gnuradio] fft display frequency spotting |
Date: |
Tue, 2 Aug 2005 13:54:09 -0400 (EDT) |
Gang - getting an accurate frequency reading from an fft display is pretty
easy. This works for me:
import wx.lib.evtmgr as em
...
# add an fft display to panel_7, nice size, avg on and weaver IF
# offset
fft = fftsink.fft_sink_c (self.fg, self.panel_7, fft_size=512, \
sample_rate=af_sample_rate, baseband_freq=-1.8e3, average=True, \
size=(680,240))
self.fg.connect (self.xlate_L, fft)
# for mouse position reporting on fft display
em.eventManager.Register(self.Mouse, wx.EVT_LEFT_DOWN, fft.win)
...
def Mouse(self,event):
fRel = ( event.GetX() - 48 ) / 15.2 - 20
print eng_notation.num_to_str(self.frequency + (fRel*1e3))
Voila - just click on the peak or feature of interest and read it's
frequency off the console. Change centers, scales and offsets to fit
your freq range and window size.
--Chuck
- [Discuss-gnuradio] fft display frequency spotting,
cswiger <=