Codec 2 is an open source (LGPL 2.1) low bit rate speech codec. Also included: + FDMDV modem (README_fdmdv.txt) for HF channels + Coherent PSK (cohpsk) for HF channels + FSK modem (README_fsk.txt) for VHF channels + an OFDM modem for HF channels (ofdm) + the FreeDV API - a library for embedding FreeDV in other programs