PhosphorDSC

PhosphorDSC is a real-time Digital Selective Calling decoder for iPhone. Tune a shortwave receiver to an HF or MF DSC channel, hold your iPhone near the speaker, and watch distress alerts, safety calls, urgency calls and routine ship-to-shore traffic appear on an authentic amber phosphor CRT display. DSC is the automated calling system at the heart of the Global Maritime Distress and Safety System (GMDSS). Ships and coast stations exchange short digital bursts carrying the caller's MMSI, a priority, and for distress calls a position, a time and the nature of the emergency. PhosphorDSC decodes them all on-device. No account, no network. SIGNAL PROCESSING PhosphorDSC implements the ITU-R M.493 DSC protocol in Swift with purpose-written DSP. • Ten-bit error-detecting character code, checked on every character • Phasing-sequence lock, the way the standard intends, so character timing comes…