Cyrinx (36kbps Acoustic Transport)

What it does

Cyrinx is an open-source acoustic modem. It measured 65.9 kbps of verified payload from a MacBook Pro speaker to Pixel 7a microphones.

Cyrinx turns bytes into an audio waveform, plays it through a speaker, and recovers the bytes from microphone recordings. In one close-range bench setup, built-in MacBook Pro and Pixel 7a audio hardware delivered 65.9 kilobits per second of byte-verified payload —about 8.2 kilobytes per second. The 65.875 kbps clock includes synchronization, pilots, error correction, CRCs, and four 0.25-second gaps. Only payload blocks that passed CRC and matched the scheduled bytes count. It does not include retransmissions, app setup, or a preceding channel-sounding step. ADB coordinated the capture, but no payload traveled over USB or radio. The faster profile missed its reliability gate: 98.481% block…from cyrinx.org

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