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[Discuss-gnuradio] Lowpass filter in receive_path.py
From: |
jonshan |
Subject: |
[Discuss-gnuradio] Lowpass filter in receive_path.py |
Date: |
Wed, 20 Jun 2007 17:35:42 -0400 (EDT) |
User-agent: |
SquirrelMail/1.4.8 |
Hello,
In receive_path.py, there is this code:
# Design filter to get actual channel we want
sw_decim = 1
chan_coeffs = gr.firdes.low_pass (1.0, # gain
sw_decim * self._samples_per_symbol,
# sampling rate
1.0, # midpoint of trans. band
0.1, # width of trans. band
gr.firdes.WIN_HANN) # filter type
So, the approximate pass-band of this filter is from 0 Hz to 1 Hz. Isn't
this a little small? (Input signal must have extremely small bandwidth to
pass through.)
In am_rcv.py, and other codes the pass-band is more understandable, like
9e3 Hz = midpoint of transition band.
Jonathan Shan
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