Multiplexing a full wave rectifier!

[Bjorn Julin]

> > Hmm, takling about filters, is it insane to multiplex a allpass
> > among a bunch of channels? I dont need to go above 12Khz!

>Yes, multiplexing an allpass filter is insane, in reality you would
>get crosstalk between the channels, since the capacitors would keep
>the charge. Multiplexing the caps too would possibly solve this, but
>then you have a lot of switches, so... here the benefit is less
>obvious. The cross-talk would be strongest at the low frequency, and
>better at higher frequencies, but it would be so bad that you better
>just mix the signals directly, since that is basically the effect you
>will get.

Muxing a Hipass then?
I must be in sane, i will never give up! :-)

Actually, in what order do you mean that this muxing is
taking place? My order are, allpass-buffer-switch-cap-buffer.

> > >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.
> >
> > Sampling effect is the minor problem in this app.
> > Hmm, glitches, the rectifyer are in front of the mux?
>
>If you run a switch-rectifier-switch-envelope follower setup, if you
>have two distinctly diffrent levels on two channels and the switching
>is not well-matched, then the envelope follower for one channel would
>sence leakage of the incorrect channel for some short time. Thus, the
>detected level would become incorrect. I think that this effect is >not 
>very strong, so I would not care about it most of the time.

Well my arrangement are infact a 
rectefier-buffer-switch-cap-buffer-mixer-out!!

BJ
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