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my goodness, please read the posts again.

I did not state that there is a signal beyond 20K. Nada, never..so, why are you spending so much time saying such?

sm: ""
I don't agree. I don't think that would work if what you are talking about is FR. The way to maintain temporal accuracy between two signals in an analog circuit is to see to it that the signals travel through the circuit at the same speed through the same distance within the tolerence required. If you assume the index of refracton of a circuit is about 0.5 for audio frequency circuits, then 0.5 C is about 90,000 miles per second. That's about one mile every 10 microseconds or 0.1 miles per microsecond. Keep the distances the electrons have to travel between the two channels less than 1/2 mile different from each other and you won't have to worry about distortion in perceiving direction. ""

I have absolutely no idea why you cruised off in that direction, please refrain from such, as it added nothing to the discussion.

When I require a system which has to have 2 to 5 uSec temporal accuracy, the easiest method which guarantees that, is to make the system much faster than that speed. That way, I know that all slews which pass through retain their fidelity.

Designing to such excessive bandwidth does not imply that there are frequencies up there which we can hear. It is just a brute force method of assuring that the circuit has no operating point based temporal issues. In actuality, that assurance is assumed, not rigorous.

btw, index of refraction is consistent with the use of free field em propagation, and is of little use when speaking of analog circuitry. For analog transmission speed, one has to consider L and C, which has no direct relation to any index of refraction for circuits which are not coaxial by design.. The index can indeed be related to the wires and insulation, but that relationship describes only the minima possible if all e and m fields are constrained to reside within the media...analog design cannot do such.

RLC circuitry of course has it's linear issues, which are normally well behaved and predictable...however, semi's are a whole nuther ball of wax.

Heck, most people don't even realize that a forward biased pn junction has a "heck" of a lot of capacitance, that being current related in a very non linear fashion.

Cheers, John



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