On 24/11/12 06:55 AM, Markus Gonser wrote:
Hello,
I run gnuradio latest stable installation on a 64bit Ubuntu
Installation with Pentium 977 + 8GB RAM. I use the DVB-T Hama
Nano DVB-T-Stick which is one of the RTL-Chip derivates. I tried
to create a FM-Radio reception which only consists of the
OsmoSDR-Srouce, A WBFM Receive PLL and the Audio Sink (see
attached png)
What I get is a stuttered signal processing of the
recepition. I can here the radio signal, but it is interrupted
at a rate of approximately 3 Hz. I checked the CPU load but it
is well below 100%. Does anyone have an idea what I did wrong? I
would appreciate any sort of suggestions. Thanks!
Additional experiment: when I make a chain of sine-wave ->
WBFM-Transmitter -> WBFM-Receiver -> Audio Sink, with the
sample rates as shown in the original fm receiver, there is
continuous playback. Therefore I expect that it has something to
do with the OsmoSDR, libusb, rtl-driver, rtl-chip.
Any suggestions?
Regards,
Markus
================================
m48/m48+ by Markus Gonser
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705.6k is likely not a supported sample rate on the RTLSDR.
It's fairly rare that sample rates on any SDR are exactly multiples
of audio rates, so you have to use
rational resamplers, or fractional interpolators to match rates.
--
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org