Multiplexing a full wave rectifier!

[Magnus Danielson]

From: "Bjorn Julin" <bnillson at hotmail.com>
Subject: Multiplexing a full wave rectifier!
Date: Mon, 02 Oct 2000 22:21:49 GMT

> Is it insane to multiplex a full wave rectifyer?
> 
> My intention was for a usage in a frequency/pitch shifter
> application to multiplex a rectifyer at aprox 100khz
> among a couple of channels.

My answer would be like this:

Yes and No.

Yes, if you would have to set up hardware just to do the multiplexing
I think it will be more effort than just making several precision full
wave rectifiers.

No, first, the rectifier function as such is not a very time dependent
thing, so you don't build up much of a state as you do in say filters.
However, you naturally causes filtering effect due to the sampling
effect. Also, a envelope follower would be sligtly receptive to
glitches when you go from low-to-high or high-to-low values.

If it is just to make better use of the rectifier hardware, then I am
leaning to the more doubtfull level, where as if you really just want
diffrent inputs you surely should go ahead.

These are just my views after thinking a few cycles on the problem.

Cheers,
Magnus