There are voice encoding schemes that require much less. I've 
experimented with this codec (for example), and found it quite good even 
at 3k bits per second:
    http://www.hawksoft.com/hawkvoice/

It's not lossless mind you, but quite intelegible and almost natural 
sounding.

Artie Lekstutis
KC2MFS

>What would it take to provide a similar connection on HF? Assume you'll need 
>*at least* a 30kb data channel. Most of the protocols I have seen today will 
>get you about 2bits/hz on HF. That means you'll need at least a 15khz wide 
>data channel. 
>
>  
>






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