Hi Marcus, Raw IQ samples take lots of memory because each sample will be around 8Bytes. Suppose, if we 1Msps sample rate, just for 10 minutes of data, we get 10*60*1M*8B = 4.8GB data. On the other hand, if you store just FFT with 1024 bin, we get 4.8GB/1024 power values right (which has very less size)?
Please correct me if I am wrong. Thanks On Wed, Jan 11, 2017 at 7:32 AM, Marcus Müller <[email protected]> wrote: > Hi Mallesham, > > I don't understand – the raw IQ samples and their FFT have the same size, > and data type. > Maybe you've understood something that I (and Martin) didn't – could you > elaborate? > > Best regards, > Marcus > > > On 01/11/2017 12:56 AM, Mallesham Dasari wrote: > > Hi Hasini, > > If you are trying to print just the FFT, it should not be an issue. If you > print raw iq samples, then you will run out of memory. By long, you mean > how long? Days? > > On Tue, Jan 10, 2017 at 3:16 PM, Martin Braun <[email protected]> > wrote: > >> Hasini, >> >> can you please re-state what you're trying to do? That might help you >> getting some answers. It is not quite clear from this email. >> >> Cheers, >> Martin >> >> On 01/02/2017 09:16 PM, Hasini Abeywickrama wrote: >> > Hi all, >> > >> > I have a flowgraph that reads a signal and writes its FFT samples to a >> > file. I need to run this continuously (for a long time), without running >> > out of memory. >> > >> > I tired deleting the earlier FFT samples from the file but that messes >> > up with reading the data. I also tried starting writing to a different >> > file after some time so the initial file can be completely deleted. But >> > it did not work as well. >> > >> > What would be the best approach for this? Any thought would be very much >> > appreciated. >> > >> > Regards, >> > Hasini >> > >> > >> > _______________________________________________ >> > Discuss-gnuradio mailing list >> > [email protected] >> > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> > >> >> >> _______________________________________________ >> Discuss-gnuradio mailing list >> [email protected] >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> > > > > -- > Best Regards, > *Mallesham Dasari* > Department of Computer Science > Stony Brook University > USA - 11794 > > > _______________________________________________ > Discuss-gnuradio mailing > [email protected]https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > > > _______________________________________________ > Discuss-gnuradio mailing list > [email protected] > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > -- Best Regards, *Mallesham Dasari* Department of Computer Science Stony Brook University USA - 11794
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