[amsat-bb] Re: SSTV Algorithms?

[Joe Fitzgerald]

Curt Nixon wrote:
>  I expect that the faster the soundcard samples, the better?
>
>   
It's counterintuitive,  but through the magic of sampling theory, once 
you sample at twice the maximum frequency of the signal you are 
interested in you know _everything_ about it!  As a practical matter, 
most ham gear audio rolls off sharply above 3 kHz (and SSTV is lower 
than that) , so sampling at a measly 8 or 11.025kHz rate is plenty. 

Howard Long wrote:
> Do you know of detailed texts that are public domain? If
> so let's have 'em!
>
>   

And it's not public domain, but it is available as free software:   
check out QSSTV for source code.

If you are interested in sampling theory, check out 
http://www.dspguide.com/ch3/2.htm

-Joe KM1P