Comments (3)
Seems that all is good, ARM device was just too weak to decode voice fast enough, by playing a little bit more with mbuffer
managed to get it working with this command:
# rtl_fm -F1 -o4 -g 30 -f <freq> -M fm -p <ppm> -s 48k -A fast -l 0 -E deemp | mbuffer -c -m 50M | dsd -mg -v 10 -fr -i - -w test.wav
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from dsd.
It is not really Raspberry, but old Efika MX running Debian Wheezy, which is approximately equivalent to Raspberry V2, but with the single core ARMv7 Cortex A8 CPU (NXP i.MX515) running at 800 MHz.
Processor : ARMv7 Processor rev 1 (v7l)
BogoMIPS : 799.53
Features : swp half thumb fastmult vfp edsp vfpv3
CPU implementer : 0x41
CPU architecture: 7
CPU variant : 0x2
CPU part : 0xc08
CPU revision : 1
From mbuffer
output it is clearly seen that buffer grows sometimes up to 10-20% and when there is no more transmissions on the channel it is conumed by DSD
down to 0% and audio is written to the file.
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