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sh123 avatar sh123 commented on August 10, 2024

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

from dsd.

BrianG61UK avatar BrianG61UK commented on August 10, 2024

from dsd.

sh123 avatar sh123 commented on August 10, 2024

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.

from dsd.

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