[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Discuss-gnuradio] Software HDTV
From: |
Eric Blossom |
Subject: |
Re: [Discuss-gnuradio] Software HDTV |
Date: |
Mon, 8 Sep 2003 13:55:37 -0700 |
User-agent: |
Mutt/1.4.1i |
On Tue, Sep 09, 2003 at 10:35:22AM +0800, Daniel Piccoli wrote:
> I've heard that realtime software HDTV is not yet possible with current
> processor speeds. Is it possible remedy this by using networked
> distributed computing (provided we are on a low latency network)?
>
Sure. Doesn't even have to be that low latency, since we're really
pushing a big pipeline of data around.
You'll need pretty good i/o on the machines, since the data rates
don't fall off until pretty far up the pipeline.
Sorry, I can't locate a piece of email I put together with all the
data rates through the various sections, but the beginning of the
pipeline is running at 20M/samples / sec, 4 bytes / sample (float), so
you're looking at 80MB/sec. That'll barely fit across 33MHz PCI and
would require gig ethernet between the boxes.
After the symbol timing recovery we're running at 10.76M
samples/second, so the data rate falls down into the range of
43MB/sec. The final output rate is about 19 Mbit/sec (2.4 MB/sec)
Eric