I have switched my linux environment from Fedora 12 to Ubuntu
10.04. This gives me better network performance with the USRP2, even
when running Ubuntu 10.04 inside a VMware environment on Mac OS X 10.4.
However, real-time audio, e.g. an FM receiver application, when played
back in real-time gives me crackles and distortions. If the output is
sent to a wave file sink, and stored on the hard disk, it sounds fine.
So, FM demodulation is happening correctly and the signal reception is
very clear, as evidenced by the stored wave file.
However, when listening to it in real-time, it’s not the case.
Has anyone else encountered this problem before? I’ve run these tests
both natively by installing Ubuntu 10.04 on the iMac 27 i7 and
configuring the intel HDA audio module, and also on a VM image, but it
gives me the same results.