[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Discuss-gnuradio] gr-atsc progress
From: |
Charles Swiger |
Subject: |
Re: [Discuss-gnuradio] gr-atsc progress |
Date: |
Wed, 25 Apr 2007 11:52:09 -0400 |
On Wed, 2007-04-25 at 08:12 -0700, Eric Blossom wrote:
> On Wed, Apr 25, 2007 at 11:02:13AM -0400, Chuck Swiger wrote:
> > The 2.x gr-atsc seems to be closer to working, at least the flow control
> > (forecast,consume,etc) creates the exact to-the-byte correct quantity of
> > output with no loss of sync (since it keys on easy to discern -5/+5), on
> > 120MB size output files.
> >
> > However the *quality* of the output is only about 65 percent correct,
> > which is not suprising if you compare the output of a working (0.9)
> > equalizer:
> >
> Did you port the "right" bit timing loop?
>
> As I recall, I tried 2 or 3 different approaches. Without checking
> the old code, I'm not sure which one I ended up using.
>
Yes, 0.9 uses GrAtscBitTimingLoop3, which uses atsc_sssr, of which
atsci_sssr in the new stuff is a carbon copy.
There's also two equalizer modules, lms and lms2 (and nop). I'll look
closer at those tonight also.
--Chuck