you could use a VCR right? channel 3? or cable TV provideri made a bunch of capture files with my USRP as they shut down the analog signals. shortly after my raid5 array crashed and i never made backups i did try another one, its uploaded herehttp://kd8eyf.org/capture_files/i never tested it so i have no idea what it looks like but my fft showed a nice NTSC signal
Fri, 6/10/11, Tom Rondeau <trondeau1...@gmail.com> wrote: From: Tom Rondeau <trondeau1...@gmail.com> Subject: Re: [Discuss-gnuradio] decoding NTSC tv To: "open bts" <obts94...@hotmail.com> Cc: discuss-gnuradio@gnu.org Date: Friday, June 10, 2011, 6:52 PM On Fri, Jun 10, 2011 at 3:12 PM, open bts <obts94...@hotmail.com> wrote: I'm looking to decode NTSC with my gnuradio. I found thishttp://www.danielgarcia.info/thesis/ online where someone usedan older USRP and gnuradio version to decode NTSC and PAL. I was able to mangle his script a bit to run with newer gnuradioand UHD. (I hard-coded in some of the parameters for quick testing, it needs some polish once completed).However I still just get a black screen, so we're not all the way there yet. Anyone around familiar with this code? The original code seemedto have a sample rate of around 1Ms/sec (ie. adc rate 64M decimated64 times, if I read the code correctly). Is this enough for a tv signal? It looks like an NTSC channel is around 6M wide (with color andsound), right? I've not played with this code, no, but 1 MHz bandwidth doesn't sound like it'll work. You can see the spectrum mask here: http://en.wikipedia.org/wiki/NTSC 1 MHz doesn't get you a whole lot of information in NTSC. You really need the entire 6 MHz. I'm going to try to get a stronger signal to test with and play withit some more, but if anyone is interested in helping, I'd welcomethe assistance. Where are you getting NTSC transmissions now, anyway? Only low power TV is left in the US to transmit on NTSC, and I think most of them have moved away from it, too. I'm sure there's still signals out there, I'm just wondering where and what services would still be using it. I also don't know the state of NTSC outside of the US, but it was fairly limited to being with. Tom -----Inline Attachment Follows----- _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
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