[W4OVH] New HF Digital Voice Technologies On The Horizon

[3t3]

Hello Tacoists -

I just found the email listed below on the Ole Virginia Hams' Reflector.
I figured some of us in AMRAD would be interested in it.

     Terry McCarty
    3t3 at comcast.net
        wa5nti
---------------------------------
Subject: New HF Digital Voice Technologies On The Horizon
 


  Forget about D-Star, TRBO and other proprietary digital voice modes!!!


  Introduction:

FreeDV is a GUI application for Windows and Linux (MacOS and BSD are in 
testing) that allows any SSB radio to be used for low bit rate digital 
voice.

Speech is compressed down to 1400 bit/s then modulated onto a 1100 Hz 
wide QPSK signal which is sent to the Mic input of a SSB radio. On 
receive, the signal is received by the SSB radio, then demodulated and 
decoded by FreeDV.

FreeDV was built by an international team of Radio Amateurs working 
together on coding, design, user interface and testing. FreeDV is open 
source software, released under the GNU Public License version 2.1. The 
FDMDV modem and Codec 2 Speech codec used in FreeDV are also open source.


    Why FreeDV?

Amateur Radio is transitioning from analog to digital technologies, much 
as it transitioned from AM to SSB in the 1950's and 1960's. How would 
you feel if one or two companies owned the patents for SSB, then forced 
you to use their technology, made it illegal to experiment with or even 
understand the technology, and insisted you stay locked to it for the 
next 100 years? That's exactly what was happening with digital voice. 
But now, hams are in control of their technology again!
-
FreeDV is unique as it uses 100% Open Source Software, including the 
audio codec. No secrets, nothing proprietary! FreeDV represents a path 
for 21st century Amateur Radio where Hams are free to experiment and 
innovate, rather than a future locked into a single manufacturers closed 
technology.
-
The Codec2 Project Asks FCC to Modernize Regulations:
The Codec2 project has developed FreeDV 
<http://freedv.org/tiki-index.php>, 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 
<http://apps.fcc.gov/ecfs/document/view?id=7022090358> created by Bruce 
Perens proposes that FCC allow all digital modulations and published 
digital codes on ham radio and switch to bandwidth-based regulation.
-
Read more at: http://freedv.org/tiki-index.php
-
Details also here:
http://tech.slashdot.org/story/13/01/15/031232/codec2-project-asks-fcc-to-modernize-regulations

N4SN

-- 
Ole Virginia Hams meet at the Prince William County Red Cross 9930 
Liberia Avenue, Manassas, Virginia, on the third Monday of every month. 
See you there!
 
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