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
on 2007-06-21 01:36
on 2009-05-13 06:29
no I don't understand this either.