Nyquist and Shannon

On Thursday, February 4, 2016 at 3:17:39 PM UTC-8, RichD wrote:
> Probly been asked many times, but - 

> Why is the sampling theorem called Shannon-Nyquist?  
> Nyquist published his paper in 1924, what was Shannon's 
> contribution?  Where was the original's deficiency?


As well as I know it, Nyquist did the dual problem:

He figured out that the bandwidth needed to get pulses through a cable was half the pulse rate. 
That is, he wanted to get digital signals through an analog medium, where now we want
 to get analog signals through a digital medium. 

But the math is the same either way, so he gets credit for it.

Reminds me of the discussion at the beginning of an ISDN book about the last time our
communicaitons system was all digital: it was digital (telegraph) before analog (telephone),
and then back to digital (ISDN, ADSL, etc.), but not yet completely digital.