Re: [Discuss-gnuradio] gr-atsc

[Charles Swiger]

On Fri, 2007-04-27 at 13:06 -0400, Charles Swiger wrote:
> On Fri, 2007-04-27 at 08:48 -0700, Eric Blossom wrote:
> > On Fri, Apr 27, 2007 at 10:15:35AM -0400, Chuck Swiger wrote:
> > > The 2.x version of atsc_field_sync_demux has been proven to work.
> > > 
> 
> > I'll take a look at this as soon as I finish with the USRP power
> > management problem. 
> > 
> 
> Actually I just got the 2.x equalizer to work (w00t!). Then verified the
> 2.x field sync checker as working ok.
> 
> That leaves just ONE module, and then we'll be all up to date: the Bit
> Timing loop.
> 

Well, it turns out the bit_timing_loop already works so at this point
the 2.x gr-atsc is fully functional from antenna to mpeg output (with
warts, like a segfault in btl-fsd.py at the end of a decoding run).

I'll put better instructions on how to use it in the
gr-atsc/src/python/README shortly. The biggest advantage is that now we
can easily run differnt combinations of modules to spread the work over
multiple processors, tied together with named pipes.  The most obvious
improvement is probably using an fpll that takes complex input data.
Right now we have to interpolate by 3 (interp.py), shift to 5.75Mhz and
convert to float (xlate.py), then feed the fpll which does another
shift.

--Chuck