[Patch-gnuradio] patch for gr_noise_source and previously submitted patch for gr_trellis

[Tim Meehan]

Hello,

Please see attached patch for gr_noise_source and qa code.  Also
included in this patch is previousle submitted patch for gr_trellis
and docs

Problem:  gr_noise_source returns the same sequence for all positive
seeds.  This is probably not the expected result and will likely lead
to confusion.

Reason: gr_noise_source calls function derived from well known ran1()
function that sets all positive value seeds to 1.

from gr_random.c gr_random::ran1()
...
 if (d_seed <= 0 || !d_iy)  {
   if (-d_seed < 1)
     d_seed=1;

proposed fix:  Mod gr_noise_source to call gr_random with a negative
value if called with a positive seed.

Tim

gr_trellis_and_gr_noise_source.patch
Description: Text Data