stegachirp FSK on top of audio band Survives WAV, robust to re-sampling stegachirp is purpose-built for WAV audio. The bit stream is FSK-modulated at 18/20 kHz, well above the audible band but within ...
Stack Python 3.9 — Core language Flask — Web framework for all three services APScheduler — Background task scheduling & cleanup SQLite — Embedded database Pillow / qrcode / stepic — Image & QR ...
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