Here's the current Codec2 development status:
http://www.rowetel.com/ucasterisk/codec2.html
[X] Milestone 0 - Project kick off
[X] Milestone 1 - Alpha 2400 bits/s codec
[X] Spectral amplitudes modelled using LPC
[X] Phase and voicing model developed
[X] Pitch estimator
[X] Spectral amplitudes quantised using LSPs
[X] Decimation of model parameters from 20ms to 10ms
[ ] Refactor to develop a seperate encoder/decoder functions
[ ] Complete 2400 bits/s codec demonstrated
[ ] Reduced complexity voicing estimator
[ ] Test phone call over LAN
[ ] Release 0.1 for Alpha Testing
[ ] Milestone 2 - Beta codec for digital radio
[ ] Gather samples from the community with different speakers,
input filtering, and background noise conditions that break
codec.
[ ] Further develop algorithm based on samples above
[ ] Design FEC scheme
[ ] Test over digital radio links
[ ] Milestone 3 - Fixed point port
[ ] Milestone 4 - codec2-on-a-chip embedded DSP/CPU port
________________________________
From: John D. Hays <[email protected]>
To: [email protected]
Cc: a cutler22 <[email protected]>
Sent: Mon, June 7, 2010 12:01:29 AM
Subject: Re: [DSTAR_DIGITAL] Codec2 development - open source vocoder
On 6/6/2010 5:18 PM, a cutler22 wrote:
>>The prospect of an open-source vocoder, ham-developed would open a lot
>of doors in the way of experimentation, and reduce the $$$ barrier. A
>DSTAR protocol implementing Codec2 Digital Voice would significantly
>drop the entrance and appeal to a much wider audience!
>
>>-73 de Anthony, KE7HQY
>
>
D-STAR by definition includes AMBE, any other vocoder is not D-STAR. I
applaud people working to advance the art but D-STAR is defined -- if
what the experimenters create is better, then it will get a following.
(If it doesn't infringe on someone else's intellectual property --
which means it better get patented or otherwise protected so someone
else doesn't patent it after the fact -- big dollars.)
I think cost is a red herring -- the AMBE chip is around US$20+ per
unit. If the new vocoder can be produced for that price in small
quantities for hams it would be very surprising.
--
John
D. Hays
Amateur Radio Station K7VE
PO Box 1223
Edmonds, WA 98020-1223
VOIP/SIP: [email protected]
Phone: 206-801-0820
801-790-0950
Email: [email protected]
