audio =3D 20Hz-20KHz (50mS-50uS)

I'll be interested how you'll sense a 50mS period sinusoidal signal
with a 5uS response time. The real question is why, protecting a
speaker or generating a signal for a muting device does not need fast
response.

BTW, you don't need any external logic device except a resistor tied
at the comparator input.

Vasile

On 11/12/06, Jan-Erik S=F6derholm <jan-erik.soderholm@telia.com> wrote:
> dax2@hotmail.com wrote :
>
> > It doesn't have to be instantaneous in processor time.
>  > I'm willing to go a few cycles. I doubt anyone would
>  > notice a few microsecond of lag time.
>
> Now, are we talking about what can be "noticed" by an
> human (eye) ? Then even a few *millisecons* or a few
> *10's* of millisecons would probably be just fine.
>
> It's probably quite a difference between "a few us" and
> "a few ms" when it comes to designing the (external)
> signal smoothing circuit. From something fast using
> active (opamps) components to simple things using
> maybe only a few passives.
>
> Now, if you realy need "a few" (5-10 ?) *us* response
> time, well so be it.
>
> Another important design criteria is what the volume
> is. If these "products" are ment to be made in large
> quantity, one might look into simpler hardware and put
> more of the "logic" into the firmware. If low volume,
> it could be wise to simplify the firmware by adding
> some extra hardware...
>
> Jan-Erik.
>
> --
> http://www.piclist.com PIC/SX FAQ & list archive
> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist
>

-- =

http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist