17.0 kHz – 19.0 kHz Acoustic Carrier
Acoustic Air-Gapped
Device Communication
Transmit text, Unicode, and telemetry using near-ultrasonic sound waves via standard Web Audio. 100% offline, cross-platform, zero pairing required.
Acoustic Transmitter
Synthesize near-ultrasonic MFSK audio tones in real-time or export downloadable 16-bit PCM WAV files.
Offline File Decoder
Drop recorded audio or WAV files to demodulate packets locally with pure client-side Goertzel filter banks.
AudioWorklet Listener
Real-time microphone stream with 60 FPS waterfall spectrogram and automatic CRC-verified packet assembly.
Hardware Diagnostics
Test transducer response, verify 44.1/48 kHz sample rates, and run 17–19 kHz acoustic speaker tests.