On 09/28/2017 01:21 PM, Cinaed Simson wrote: > On 09/27/2017 12:07 AM, Marcus Müller wrote: >> Hi Cinaed, >> >> interestingly, period() gives me 0b(degree ones) all the time, so I'm >> not sure we don't see a bug there. > > I looped over degree in range(1,33) > > src=digital.glfsr_source_f(degree,True,mask,seed) > src=digital.glfsr_source_b(degree,True,mask,seed) > > and I consistently get a period of degree**2-1 both float and byte types.
Opps, the period was period=2**degree-1 -- Cinaed > > But I did notice running the GLFSR source in a flow graph with type Byte > generates an asymmetric frequency spectrum about the center frequency. > > There are persistent dips in the amplitude at roughly -1.27 Hz and -2.58 > Hz which aren't present in the positive frequencies - and are not > present in the spectrum for type Float. > > -- Cinaed > > >> >> Best regards, >> >> Marcus >> >> >> On 09/27/2017 12:01 AM, Cinaed Simson wrote: >>> Try >>> >>> from gnuradio import digital as digital >>> src=digital.glfsr_source_f(13,False,0x0000100D,0xA5A5) >>> src.period() >>> >>> src has type <gr_block glfsr_source_f (0)> >>> >>> Unfortunately, I don't know enough to be able to convert to an array of >>> floats need for filter taps. >>> >>> -- Cinaed >>> >>> >>> On 09/26/2017 05:45 PM, Chad Spooner wrote: >>>> All: >>>> >>>> I've got a working signal generator in GRC that uses the FFT Filter >>>> block. In the Taps >>>> field of this block, I've hand-entered a length-31 sequence that is an >>>> MLSR sequence. >>>> These sequences can be generated using the GRC block GLFRS Source as well. >>>> >>>> What I would like to do is call GLFSR from within the FFT Filter Taps >>>> field with arguments >>>> that depend on a Parameter. Specifically, the Degree parameter of GLFSR >>>> would >>>> be tied to a Parameter in the flowgraph. >>>> >>>> I've been searching around the web for a way to do this, but I can't >>>> seem to find how >>>> to call things like GLFSR as opposed to using the GLFSR block in GRC. My >>>> Google >>>> searches do not seem to contain the correct keywords to get me to the >>>> help I need. >>>> >>>> I'd appreciate any hints, especially links to explanations on the web. >>>> >>>> Thanks! >>>> >>>> Chad >>>> >>>> -- >>>> Chad M. Spooner >>>> NorthWest Research Associates >>>> 301 Webster Street >>>> Monterey, CA 93940 >>>> cmspoo...@nwra.com >>>> 831 582 4904 >>>> cyclostationary.blog >>>> >>>> >>>> >>>> _______________________________________________ >>>> 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
