Realtime receiving live tetra signal;

Hi Folks, I have a sample tetra signal without encryption. I generate a test signal from the tetra sample with a vector signal generator.(@394MHz carrier and 96KHz sampling rate) I try to receive and listen this test signal realtime with USRP N200 and osmocom tetra. I combine all the osmocom tetra parts in one script (seen below) but speech is not continuous and aplay gives underrun warnings. The cpu usage is approximately %30 and there is no memory or disk write/read speed problem. I wonder what is the problem and how can i listen realtime tetra speech. I also test demodulator offline and then try the rest of the script realtime and there is no problem, i can listen continuous speech without any gap. So i suspect from the demodulator performance.. I am using Ubuntu 12.04 64bit, Gnuradio 3.6.5.1, UHD 003.005, SSD disk, 8GB Ram, Intel i7-3520M CPU. Thanks.. ------------------------------------------------------------------ #!/bin/bash sudo sysctl -w net.core.wmem_max=1048576 sudo sysctl -w net.core.rmem_max=50000000 rm /tmp/out.float /tmp/out.bits /tmp/out.codec /tmp/out.pcm /tmp/traffic.out mkfifo /tmp/out.float mkfifo /tmp/out.bits mkfifo /tmp/out.codec mkfifo /tmp/out.pcm mkfifo /tmp/traffic.out ~/Desktop/osmo-tetra/src/demod/python/uhd-tetra_demod.py -f 394E6 -o /tmp/out.float & float_to_bits /tmp/out.float /tmp/out.bits &  tetra-rx /tmp/out.bits & cdecoder /tmp/traffic.out /tmp/out.codec & sdecoder /tmp/out.codec /tmp/out.pcm & aplay -fS16_LE /tmp/out.pcm rm /tmp/out.float rm /tmp/out.bits rm /tmp/out.codec rm /tmp/out.pcm ------------------------------------------------------------------ Furkan Elibol PhD Candidate Ozyegin University