RTL-SDR decoding digital voice
Another great tool for RTL dongle is “Digital Speech Decoder”: https://github.com/szechyjs/dsd
Installation instructions: https://github.com/szechyjs/dsd/wiki/Installation
# Save to wave file
$ socat stdout udp-listen:7355 | dsd -i - -w voice.wav
# Real-time voice decoding
$ socat stdout udp-listen:7355 | padsp dsd -i -
# Command line variant
rtl_fm -f 430.785M -M fm -s 70K -r 48K -E dc | padsp dsd -fr -i -Tutorial: https://www.rtl-sdr.com/rtl-sdr-radio-scanner-tutorial-decoding-digital-voice-p25-with-dsd/
Rewritten decoder library: https://github.com/f4exb/dsdcc