Digital Speech decoder is an open source software package that decodes several digital speech formats. It uses the mbelib library (a separate open source package) to synthesize the decoded digital speech. It does not allow decoding of encrypted communications. It can save the compressed digital audio bits to "mbe" data files (.imb and .amb extensions) and play back those saved files.
The latest version 1.4 supports the following formats and modulation types:
- P25 Phase 1
- ProVoice EDACS Digital voice
- X2-TDMA - Motorola public safety TDMA system with P25 style signaling (mostly based on DMR)
- DMR/MOTOTRBO - Digital Mobile Radio standard
- NXDN - 9600 baud (12.5 kHz) NEXEDGE and 4800 baud (6.25 kHz) NEXEDGE/IDAS
- C4FM modulation
- GFSK modulation (including GMSK and other filtered 2/4 level FSK)
- QPSK modulation (sometimes marketed as "LSM")
Link naar de website:
Digital Speech DecoderDeze software werkt ondertussen ook met de RTL-SDR Dongle. Op Youtube zijn een aantal voorbeelden te vinden hier een vb
