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

[Alexandru Csete]

On 12 August 2010 09:24, Elvis Dowson <address@hidden> wrote:
> 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.

Try to resample the audio to 44.1 kHz or 48 kHz using a
rational_resampler block. That might solve it.

Alex