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Re: [Discuss-gnuradio] hdtv hacking

From: Eric Blossom
Subject: Re: [Discuss-gnuradio] hdtv hacking
Date: Fri, 7 Apr 2006 18:20:01 -0700
User-agent: Mutt/1.5.9i

On Fri, Apr 07, 2006 at 06:49:07PM -0400, Charles Swiger wrote:
> > The most likely reason it doesn't pass, is that there is a 52
> > segment delay between what you write into the interleaver, and what you
> > get out of the deinterleaver.  To work around the behavior, drop the
> > first 52 segments of the output and then compare the remainder with
> > the input. 
> > 
> Well - writing expected_results and result_data out to files
> and manually comparing show they do match, so interleaver/deinterleaver
> work - cool! (putting skip AFTER  inter, deinter). I'll finish the
> test code and move on to Trellis Encoder / Viterbi Decoder.

That's great.  
Did you figure out how to compare them without writing to files?

> The latest benchmark I have for the 0.9 atsc is 10 minutes of data
> takes about 14 hours to decode on an Athlon 3200+ (2200 MHz real),
> and over HALF that time is spent resampling and up-mixing the data
> to emulate an mc4020 to atsc_rx.

Did you do the 5:2 resampling using the rational_resampler, or did you
interpolate then decimate in two steps?

Great work!


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