[BC] FM Stereo invention

[WFIFeng@aol.com]

In a message dated 02/19/2007 12:15:10 PM Eastern Standard Time, 
mark3xy at gmail.com writes:

> As most of you know, the FCC-approved stereo FM system was jointly
>  developed by GE and Zenith.  The difference was that Dr. Adler of
>  Zenith viewed it as a time-division-multiplex scheme (L and R
>  alternately sampled at a 38 kHz rate) while Tony Csicsatka at GE used
>  a matrix and balanced modulator to generate the L-R subcarrier.
>  
>  He was undoubtedly a brilliant engineer.

The interesting thing is that both of these methods generate virtually the 
same result! Some of those FM stereo generators on-a-chip use analog switches at 
38Khz to chop the L and R signals alternately. The end result is a "standard" 
stereo signal. Pretty slick "shortcut".

Willie...