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SoundLink v2 · OFDM

Send a file from one phone to another using only sound.

📎 Choose a file / photo

Speed

Feedback (mic)

Volume (Auto/16‑QAM likes 60–75 % on a phone speaker — louder just distorts)

Pick a file or type text. Put the receiving phone within arm's reach, its Receive tab listening.

Also: save as audio file

The whole transmission as a WAV (2 passes) — send it later; the receiver plays it near a listening phone or drops it into the Receive tab.

All local — nothing leaves your device. Custom OFDM modem: Auto probes the link and bit-loads 199 carriers (1.8–8 kHz) with 16‑QAM/QPSK/BPSK per carrier, coherent detection with pilots, Reed–Solomon FEC with erasures; fixed DQPSK/DBPSK modes as fallbacks. Real-world rate ≈ 400–1500 B/s depending on the phones and the room.