Re: [Discuss-gnuradio] Sample rate nomenclature
Chris Stankevitz wrote: Matt Ettus wrote: Q1: When using USRP source_c (complex) with decimation == 8, am I 64 MS/s complex samples / 8 = 8 MS/s complex Okay. That's certainly easy to remember. Does float act the same way? I was under the impression you sacrifice something (samples per second) when you move from float to complex sampling. source_c, decim == 8: 8 MS/s source_f, decim == 8: ? MS/s There is no usrp.source_f -- the USRP source blocks output complex floats (32-bit floats) or complex shorts (16 bit ints). Matt ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Sample rate nomenclature
Chris Stankevitz wrote: Q1: When using USRP source_c (complex) with decimation == 8, am I getting 4 million complex samples per second? 64Mhz / 8 = 8MHz floats = 4MHz complex No. 64 MS/s complex samples / 8 = 8 MS/s complex Q2: If I saved that data to a file and shared it with people, would I advertise it as Complex data, 4 million samples per second? Call it 8 MS/s complex. Q3: If someone read that in using file_source(gr.sizeof_gr_complex, file.in) and wanted to perform an FFT, what would he specify as the sample rate to the fft_sink_c(sample_rate=x)? My guess is sample_rate=4e6. 8e6. Matt ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Sample rate nomenclature
Also, gr.file_sink stores data native-Endian, so you may want to include the Endian-ness in the description. -Dan Matt Ettus wrote: Chris Stankevitz wrote: Q1: When using USRP source_c (complex) with decimation == 8, am I getting 4 million complex samples per second? 64Mhz / 8 = 8MHz floats = 4MHz complex No. 64 MS/s complex samples / 8 = 8 MS/s complex Q2: If I saved that data to a file and shared it with people, would I advertise it as Complex data, 4 million samples per second? Call it 8 MS/s complex. Q3: If someone read that in using file_source(gr.sizeof_gr_complex, file.in) and wanted to perform an FFT, what would he specify as the sample rate to the fft_sink_c(sample_rate=x)? My guess is sample_rate=4e6. 8e6. Matt ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] Sample rate nomenclature
Matt Ettus wrote: Q1: When using USRP source_c (complex) with decimation == 8, am I 64 MS/s complex samples / 8 = 8 MS/s complex Okay. That's certainly easy to remember. Does float act the same way? I was under the impression you sacrifice something (samples per second) when you move from float to complex sampling. source_c, decim == 8: 8 MS/s source_f, decim == 8: ? MS/s Thanks, Chris ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
