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From: | Marcus D. Leech |
Subject: | Re: [Discuss-gnuradio] question about overruns with simple flowgraph |
Date: | Tue, 06 Aug 2013 21:15:55 -0400 |
User-agent: | Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.24) Gecko/20111108 Fedora/3.1.16-1.fc14 Thunderbird/3.1.16 |
On 08/06/2013 09:07 PM, Stephen wrote:
If you're downsampling, you do need to make certain that the bandwidth of your incoming signal (regardless of its rate) is appropriate forI tend to use the fractional interpolator--you can get exact rate matching that way. It doesn't seem that expensive, particularly when I use it at the "low speed" part of the graph near the audio subsystem.I tried that and it worked. But it adds a small amount of hiss. I also tried the fractional resampler. It added a lot of hiss and a high pitch whine. The polyphase arbitrary resampler added a more hiss than the fractional interpolator but less than the fractional resampler. stephen
the final bandwidth after the resampler. -- Marcus Leech Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org
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