Res: ARLA/CLUSTER: CODEC para Voz Digital de 1400 bps para SSB.

[Sergio Oliveira]

Estive a escutar o áudio do codec de 1,4Kbps. Parece não de 1,4k mas de 14k,
incrivel. Não acreditei. Está espectacular. 
         
73 de Sergio Oliveira CT2IFT shack in IM59QP - Long-8.66495W (-8º39'54"W)
Lat 39.62625N (39º37'35"N) 
Av. Beato Nuno, 18 (Ed. Lagoa), 2495-401 FATIMA - Tel 91 779 2815 
Tertúlia no r/c do shack no Ed. Lagoa: café Cervejaria Luís das 11:30 às
12:30h 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
-------Mensagem original------- 
 
De: João Gonçalves Costa 
Data: 16-11-2011 14:15:51 
Para: CLUSTER (cluster  radio-amador.net) 
Assunto: ARLA/CLUSTER: CODEC para Voz Digital de 1400 bps para SSB. 
 
Amateur Radio 1400 bps Digital Voice CODEC 
 
In his blog David Rowe VK5DGR describes the work being done in developing a
Digital Voice CODEC that works at 1400 bps. 
 
The development of a 1400 bps CODEC paves the way for future Amateur Radio
digital voice systems using potentially as little as half the bandwidth of a
traditional SSB signal. 
 
In his blog David says: 
"Building a 1400 bit/s communications quality speech codec is a highlight of
my career." 
 
"The CELP based speech codecs I built in the early 90's could deliver
communications quality speech at 9600 bit/s, or (with a significant drop in
quality) run at 4800 bit/s. So managing to get about the same quality at
1400 bit/s is a nice personal achievement for me. Giving it away to the
world is even cooler." 
 
Read the David Rowe VK5DGR blog at 
http://www.rowetel.com/blog/?p=2255 
 
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