Bruce Perens writes: "The Codec2 project has developed FreeDV, a program to encode digital voice on two-way radio in only 1.125 KHz of bandwidth. But FCC regulations aren't up-to-speed with the challenges of software-defined radio and Open Source. A 24 page FCC filing created by Bruce Perens proposes that FCC allow all digital modulations and published digital codes on ham radio and switch to bandwidth-based regulation."
Bruce Perens writes: "Codec2 is an Open
Source digital voice codec for low-bandwidth applications,
in its first Alpha release. Currently it can encode 3.75 seconds of clear
speech in 1050 bytes, and there are opportunities to code in additional
compression that will further reduce its bandwidth. The main developer is
David Rowe, who also worked on
Originally designed for Amateur
Radio, both via sound-card software modems on HF radio and as an alternative to the proprietary voice codec
presently used in D-STAR,
the codec is probably also useful for telephony at a fraction of current
The algorithm is based on papers from the 1980's, and is intended to be
unencumbered by valid unexpired patent claims. The license is LGPL2.
The project is seeking developers for testing in applications, algorithmic
improvement, conversion to fixed-point, and coding to be more suitable
for embedded systems."