Let me make my question more clear. If I understand the code correctly, after "bytes_to_syms", the signal should be a float sequence of +1 or -1. I am very confused about what the signal will look like after "interp". I think it's no longer +-1 sequence any more. So does it have any special function here?
Here are several problems invloved. For the FIR interpolation filter, why we choose 1.2*data_rate/2 as the cutoff frequency and 0.4*data_rate/2 as the transition band? Second, why k = 2 * math.pi * max_deviation / self.fs? Hope anyone of you could help me get out of the confusion. Thanks for your time Sachi --- Sachi <[EMAIL PROTECTED]> wrote: > Hi, Eric > > I've got a question on the interpolation FIR filter > in > the fsk_tx.py. Here is the filter uesd: > > interp_taps = gr.firdes.low_pass (self.sw_interp, > > # gain > > self.fs, # sampling rate > > data_rate / 2 * 1.2, # cutoff > > data_rate/2 * 0.4, # trans width > > gr.firdes.WIN_HANN) > > I am a little confused. Why do you use sw_interp as > the gain? And how do you select the cutoff freq. and > transition bandwidth? > > Thanks in advance > > Sachi > > > > ____________________________________________________ > > Yahoo! Sports > Rekindle the Rivalries. Sign up for Fantasy Football > > http://football.fantasysports.yahoo.com > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > http://lists.gnu.org/mailman/listinfo/discuss-gnuradio > ____________________________________________________ Yahoo! Sports Rekindle the Rivalries. Sign up for Fantasy Football http://football.fantasysports.yahoo.com _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
