hi all , about Nick's statement , Don't worry about the USRP native rate (64/128Msps). The FPGA inside the USRP handles interpolation and decimation to step from the sample rate of the USB interface (0.5Msps to 8Msps) to the ADC/DAC rate (64Msps/128Msps). The sample rate you choose should be the sample rate that is appropriate for your application.
i think this is correct provided that you consider that the interpolation or decimation has a maximum value which is i think equal to 400 , is this true Nick??? regards , Osama Date: Wed, 11 Apr 2012 09:23:35 -0700 From: n...@ettus.com To: javma...@gmail.com CC: discuss-gnuradio@gnu.org Subject: Re: [Discuss-gnuradio] Question about sampling rate On Wed, Apr 11, 2012 at 9:14 AM, Javier Suarez <javma...@gmail.com> wrote: Hi... I mean... the sampling rate of the uhd sink and source what refers to...? I've since in some documents that if you are transmitting , you have to take in account that the DAC for output works at 128 M/s and the sample rate for the UHD sink block has to be determined somewhow from that. In the same way the ADC for reception works at 64 M/s and the sampling rate for the UHD source block has to be determined somehow from that 64 M/s . I just want to make simple transmission and reception. Am I wrong? or I am understanding not really good what I am reading about this. Thanks in advance. Don't worry about the USRP native rate (64/128Msps). The FPGA inside the USRP handles interpolation and decimation to step from the sample rate of the USB interface (0.5Msps to 8Msps) to the ADC/DAC rate (64Msps/128Msps). The sample rate you choose should be the sample rate that is appropriate for your application. --n On Wed, Apr 11, 2012 at 10:58 AM, Nick Foster <n...@ettus.com> wrote: On Wed, Apr 11, 2012 at 8:53 AM, Javier Suarez <javma...@gmail.com> wrote: Hi everyone... I am getting confused about the use of the parameter of sampling rate in GNU RADIO. I really need to understand the sampling rate of the uhd sink and source and the sampling rate of the blocks in the flow graph and how to choose those sampling rates. Thanks a lot for you help!! Sample rate is a fundamental parameter of digital signal processing. Try an introductory DSP textbook, or the following articles: http://en.wikipedia.org/wiki/Discrete_signal http://en.wikipedia.org/wiki/Sampling_ratehttp://en.wikipedia.org/wiki/Nyquist%E2%80%93Shannon_sampling_theorem http://en.wikipedia.org/wiki/Sampling_(signal_processing)http://en.wikipedia.org/wiki/Aliasing Without a basic understanding of sampling theory or DSP you will have difficulty progressing with Gnuradio. --n _______________________________________________ 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
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