Data-over-audio

Attempt to experiment with SDR concepts using audio as the channel

TX Architecture

Linux Processes DSP task

1. One Demand Tasks
   1. Channel coding
   2. Data to Symbol coversion
   3. Upscale and filter
   4. Send to front end loop
2. Free Running Loop
   1. Mix IQ w/ Lo and add
   2. Send samples to be played

RX Architecture

Linux Process DSP Task

1. Free Running Loop
   1. Capture Audio Samples
   2. Filter
   3. Coarse Freq Sync
   4. Time Sync
   5. Fine Freq Sync
   6. Symbol to Data
   7. Frame Detect / Sync
2. On Demand Processes
   1. Channel Decoding