[Discuss-gnuradio] Distorted playback of real-time audio on Linux

[Elvis Dowson]

Hi,

       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.

Elvis Dowson