On Tue, Mar 13, 2012 at 5:22 PM, Josh Blum <[email protected]> wrote:
> looks like channel model too (since it has a noise source) > > ~/src/gnuradio/grc/blocks$ grep 42 *.xml > gr_channel_model.xml: <value>42</value> > gr_noise_source_x.xml: <value>42</value> > > -Josh Good catch. That one has been updated now, too. Tom > On 03/13/2012 08:23 AM, Tom Rondeau wrote: > > On Tue, Mar 13, 2012 at 10:24 AM, Damian Bevan <[email protected]> > wrote: > > > >> Hi Tom, > >> > >> Thanks for the prompt and helpful advice. I have now tried changing the > >> seeds on the two noise blocks to different negative values (-42 and > -99), > >> and it does indeed appear to have resolved the problem. Or having one > >> positive (+42) and one negative (-99) also solved the problem. > >> > >> I think you are right that this should be in the documentation. At the > >> moment the documentation is very misleading, in that a) The default > seed in > >> the GRC block is 42, which is a great number, but unfortunately is > >> positive, and b) the documentation when you click on the block says > >> "noise_source_c(gr_noise_type_t type, float ampl, long seed = 3021) -> > >> gr_noise_source_c_sptr", which again hints at a positive seed (i.e. of > >> +3021). > >> > >> Cheers, and thanks again. > >> > >> Damian. > >> > > > > Damian, > > Thanks for getting back to me on this. I'm going to change the > > documentation to explain it. > > > > And I'm going to change the default values to 0 instead of 42/3201 since > > 0's as good as either of those. I don't want to set it negative, though, > > since that would change the output behavior of the block and someone > might > > be relying on this for consistency in their measurements or something. > > > > Tom > > > > > > > > > > _______________________________________________ > > 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 >
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