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Re: [Discuss-gnuradio] USRP for YPbPr ADC?

From: Steve Schear
Subject: Re: [Discuss-gnuradio] USRP for YPbPr ADC?
Date: Fri, 24 Dec 2004 14:52:37 -0800

At 02:11 PM 12/24/2004, Eric Blossom wrote:
On Fri, Dec 24, 2004 at 01:57:48PM -0800, Steve Schear wrote:
> At 01:19 PM 12/24/2004, Seth David Schoen wrote:
> >Does anyone have any information that would tend to indicate how useful
> >the USRP would be for digitizing a YPbPr component video signal?
> I have an active and funded project going that is designed to digitize a
> YPbPr component video signal at 80 MSPS and 8/10-bits. One option provides
> a lossless compressed output (between 4- 4.5-to-1) onto either USB 2.0 and
> Firewire, which may be sufficient for at least 720p resolution. No current
> plans for GNURadio use.

Cool project.

80 MSPS * 3 channels * 1 byte/sample * 1/4.5 = 53.33e6 bytes/sec.

Did I miss something, or how are you planning on getting that across
the USB?  Do you have a host/peripheral controller pair that will
sustain that kind of throughput?  If so, which ones?


I only mean the A/D was capable of 80 MSPS. Clearly that kind of data throughput for USB 2.0 is not practical, though I think FW/FW II can handle it. 720p requires only about (720 * 1280 * 60 * 3)/4.0-4.5 = 36.6-41.5 MB/sec which may be possible over USB 2.0 according to what I have read on this list.


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