[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Discuss-gnuradio] Re: help on xlating frequency
From: |
Markus Feldmann |
Subject: |
[Discuss-gnuradio] Re: help on xlating frequency |
Date: |
Mon, 23 Mar 2009 19:42:14 +0100 |
User-agent: |
Mozilla-Thunderbird 2.0.0.19 (X11/20090103) |
Paul Mathews schrieb:
See 'usrp_am_mw_rcv.py' for an example. Look for the code relating to these
lines in particular:
if self.use_IF:
# Turn If to baseband and filter.
self.chan_filt = gr.freq_xlating_fir_filter_ccf (chanfilt_decim,
chan_filt_coeffs, self.IF_freq, usrp_rate)
hI pAUL,
i used this example as possible as i can, but this
frequency translating filter has one important difference
to my application, the FFT-Plot-sink which is connected to this
xlating filter is staticly.
I have a slider to change my baseband to the wished spectrum, so
my xlating filter it is dynamically.
I still doesn't know whether to use a low_pass is usefull
or a band_pass. The low_pass doesn't delete the middle
signal in the FFT-Plot in my tryings.
Further on i doesn't know which conditions have to be made to
let my application work fluidly ?
Which decimation ?
Which rate is useful ? Should it use the same rate, than
the element before ?
Which is the centerpoint from which the low_pass_cutoff
and the high_pass_cutoff frequency will be counted ?
I tried it out, but still doesn't know how it works.
Regards Markus