In message <20010921174227.D9110@xxxxxxxxxxxxxxxxxx>, Mike Castle writes: > On Fri, Sep 21, 2001 at 05:17:27PM -0600, Eric Jorgensen wrote: > > I don't know enough about stereo decoding, is it possible to decode > > stereo with just an array of capacitors? > > Quite. I believe FM stereo has been around for longer than ICs. > > Since stereo is merely the encodinf of L+R and L-R (or vice versa, I always > forget), it's quite possible to use analog to to (L+R)+(L-R)=2L and > (L+R)-(L-R)=2R to get the output. Analog yes, but you still need to be able get the diff signal from the 38 khz carrier and that I think requires some active components. A couple of transistors or as I beleive in the very first FM-stereo recivers, a tube. NICAM is a digital system. 14 bit resolution with 10 bits sent at a time. Either the msb or lsb depending on signal level. This of course requires a rather sofisticated decoder circuitry. /Håkan
