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From: | Matt Ettus |
Subject: | Re: [Discuss-gnuradio] Newbe: Jerky sound with usrp_wfm_rcv.py |
Date: | Thu, 26 Apr 2007 18:01:49 -0700 |
User-agent: | Thunderbird 1.5.0.10 (X11/20070302) |
Justin Shaw wrote:
I finally got the usrp up and running. I am having two problems.1. I believe that the data rate is overflowing the usb line becuase the sound from usrp_wfm_rcv.py is jerky and the text UaUaUaUaUa... is streaming to the screen (about 1-2 times per second). I am running the pre-compiled packages available through Ubuntu on a Dell inspiron 1501 1.6 GHz processor. Would compiling from scratch help? Is there a way to decimate the data before it comes across the usb?
Use the following option to usrp_wfm_rcv.py: -O plughw:0,0And see if that helps. If it does, the problem was that your sound card doesn't directly support 32 ks/s, so turning on the ALSA resampler fixed it.
2. I need to unplug and plug the usrp after each use otherwise I get the error "RuntimeError: Unable to find USRP #0". Cycling the power is the only work around I have at this point. Any suggestions on how to fix this one? Full disclosure: I had to copy the files from /usr/local/share/usrp/Rev* to /usr/share/usrp to get the firmware to automatically load do I need to do anything else?
I think this is a recent Ubuntu problem. Which version do you use? matt
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