[BC] FM Stereo invention

[WFIFeng@aol.com]

In a message dated 02/19/2007 2:34:02 PM Eastern Standard Time, 
padrino at telos-systems.com writes:

> What you're talking about is a simple sampling method. Not much different
>  that what an A/D converter is doing at a base sampling rate. The theory is
>  the same.
>  
>  -Frank Foti

Not exactly, tho... in a true sampling environment, the signal level is 
*held* until the next sample comes along. With the chopped 50/50 mpx, you have 
alternating levels. With a stereo signal with a large variation between channels, 
you'd have the level switching back and forth with a nearly 50% duty cycle. 
If, let's say, the L channel was silent, then you'd have the R being chopped 
on/off at that 50% duty cycle. It could be somewhat restored by a sample-and-hold 
ckt in the receiver, but that's starting to get more complex than practical. 
A low-pass filter would only tend to make the chopping less pronounced, but it 
would still be there. Making the filter too aggressive would sharply 
attenuate the highs.

BTW, all- I'm just musing on this, I'm not really working on any projects, 
studies, debates, or anything like that. I do appreciate the discussion! It's 
very interesting! :)

Willie...