On Thu, Nov 17, 2011 at 6:41 PM, Hasan Rajib Imam <shuvo1...@gmail.com>wrote:
> Hello Nick, > > Thanks for your reply. > > > "you can use Gnuradio blocks such as the decimating FIR filter to > decimate additionally by however much you like." > > Could you please tell me how can I do the above thing? Actually I am very > new to gnuradio. I will really appreciate your help. > > Thanks. Hasan, You can use the gr.fir_filter_XXX(decim, taps) or gr.fft_filter_XXX(decim, taps). The taps are generally defined using gr.firdes.low_pass_2(gain, sample rate, bw, transition, attenuation, window). The 'decim' parameter for these blocks is an integer. fft_filter: http://gnuradio.org/doc/doxygen/classgr__fft__filter__ccc.html fir_filter: http://gnuradio.org/doc/doxygen/classgr__fir__filter__ccc.html firdes: http://gnuradio.org/doc/doxygen/classgr__firdes.html Tom > > On Fri, Nov 18, 2011 at 1:29 AM, Nick Foster <n...@ettus.com> wrote: > >> On Thu, Nov 17, 2011 at 8:28 AM, Nick Foster <n...@ettus.com> wrote: >> > On Thu, Nov 17, 2011 at 2:33 AM, hasanimam <shuvo1...@gmail.com> wrote: >> >> >> >> Hello all, >> >> >> >> I am here once again and would like to bother you a bit. >> >> I am using the usrp2_rx_cfile.py command to get the IQ data from >> usrp2. I am >> >> using the following command >> >> >> >> sudo python usrp2_rx_cfile.py -f 800M -d 496 -s -v -N 10 >> >> /home/gnuradio4/Desktop/observed_data/test.dat >> >> >> >> And I am getting the following output: >> >> >> >> Network interface: eth0 >> >> USRP2 address: 00:50:c2:85:35:7d >> >> Using RX d'board id 0x0053 >> >> Rx gain: 15.75 >> >> Rx baseband frequency: 800M >> >> Rx DDC frequency: 0 >> >> Rx residual frequency: 0 >> >> Rx decimation rate: 512 >> >> Rx sample rate: 195.312k >> >> Receving 10 samples >> >> Writing 16-bit complex shorts >> >> Output filename: /home/gnuradio4/Desktop/observed_data/test.dat >> >> >> >> In the above, it shows that the sample rate is 195.312k. I want to >> raise >> >> this rate but it seems that decimation rate has a limit upto 512 so i >> cant >> >> do that. >> >> Can you suggest me any other way to raise the sample rate? >> >> In fact I want the time difference between each sample to be around >> 100us, >> >> but sample rate 195k gives me 5us. >> > >> > "Decimation" means the ratio by which the 100MHz main clock is >> > divided. 100MHz / 512 = 195.312kHz. Try using a lower decimation. >> >> Oh, I think I misunderstood your question, sorry -- you don't want to >> raise the SAMPLE rate, you want to raise the DECIMATION. In that case, >> you can use Gnuradio blocks such as the decimating FIR filter to >> decimate additionally by however much you like. >> >> --n >> >> > >> > --n >> > >> >> >> >> Thank you. >> >> >> >> >> >> -- >> >> View this message in context: >> http://old.nabble.com/usrp2_rx_cfile.py-issue-tp32860995p32860995.html >> >> Sent from the GnuRadio mailing list archive at Nabble.com. >> >> >> >> >> >> _______________________________________________ >> >> Discuss-gnuradio mailing list >> >> Discuss-gnuradio@gnu.org >> >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> >> >> > >> > > > > -- > Hasan Rajib Imam > University of Electro-Communication, Japan > 1st year Masters Student > Email: shuvo1...@gmail.com > Contact No: (+81)80-5004-5931 > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > >
_______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
