Hi Rodrigo (once again), one of the wise elders reminded me that in the FFT, power is but proportional to the input power in time domain, due to a factor of fft_length occuring when forward-backward transforming.
Greetings, Marcus On 14.08.2014 11:29, Marcus Müller wrote: > Hi Rodrigo, > both is right, due to Parseval's Theorem stating that energy of a > signal in time and frequency domain is equivalent. > > Regarding "File is large": of course it is; I don't know what sampling > rate you're using, but assume you have 1MS/s of complex float, that will be > 2*32bit*10^6/s = 8MB/s of data. > > Regarding "it cannot be opened": Opened by what? Maybe you're not aware of: > http://gnuradio.org/redmine/projects/gnuradio/wiki/FAQ#What-is-the-file-format-of-a-gr_file_sink-How-can-I-read-files-produced-by-a-file-sink > > Greetings, > Marcus > On 13.08.2014 23:29, Rodrigo Rozário wrote: >> Hi Martin, >> >> I am generating by the following flowgraph: >> >> RTL2832 source -> FFT -> File Sink >> >> I tried too: >> >> RTL2832 -> File Sink >> >> Is it right? >> >> >> >> >> 2014-08-13 9:00 GMT-03:00 Martin Braun <martin.br...@ettus.com>: >> >>> How are you generating those files? >>> >>> >>> On 08/12/2014 01:30 AM, Rodrigo Rozário wrote: >>>> Hi guys, >>>> >>>> I'm trying to configure a spectrum analyzer with GNU Radio and I had a >>>> many problems. I tried a lot of ways to do it but all of them failed. >>>> >>>> More specifically, I need to get information about the FFT and store it. >>>> >>>> I tried the following: >>>> - I get data from the block RTL2832 and store it: this is generates a >>>> very big file data end a can't open. In a file of a few seconds of >>>> storage (50Mb) I can't recognize the power values. >>>> >>>> - I try to store and after open it on a editor, but not work. >>>> >>>> I think that there is any problem in the format of the data stored. Can >>>> you help? Anyone already can do it? >>>> >>>> >>>> -- >>>> /*Rodrigo Rozário */ >>>> /CREA-DF - 21339/D-DF - Professional Registration/ >>>> /Engenheiro de Redes de Comunicação - //Network Engineering/ >>>> /Universidade de Brasília - //University of Brasília/ >>>> / >>>> / >>>> >>>> >>>> >>>> >>>> _______________________________________________ >>>> 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 >>> >> >> _______________________________________________ >> 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
