[sdiy] Suitable DACs for Demultiplexing

[Jerry Gray-Eskue]

Ingo,

Some light has been shed on the origin of the bumblebee myth by author and
aerodynamicist J.H. McMasters. (Zetie, ’96) He states that it all started in
German technical universities in the 1930’s. Apparently, a famous and
unnamed Swiss aerodynamics expert was having dinner with a biologist when
the latter asked a question regarding the flying abilities of bees.

A preliminary calculation showed that there was insufficient lift to allow
bees to fly. Only about one third to one half of the required lift could be
generated. The biologist started spreading the word about scientific “proof”
that bees can’t fly and somehow the media got hold of the information.
Today, decades later it is a ubiquitous myth that is rarely questioned and
is often used to disparage science. The implication, of course, is that if
“science” (as an abstract entity) claims that bumblebees cannot fly, when
they clearly do fly, then “science” is bunk. The findings of science can
therefore be comfortably disregarded as esoteric and irrelevant.

http://www.theness.com/scientists-report-bumblebees-cant-fly/

Why don't you try it and let us know how well you can get it to work?

- Jerry

-----Original Message-----
From: synth-diy-bounces at dropmix.xs4all.nl
[mailto:synth-diy-bounces at dropmix.xs4all.nl]On Behalf Of cheater cheater
Sent: Friday, October 23, 2009 5:39 AM
To: synth-diy
Subject: Re: [sdiy] Suitable DACs for Demultiplexing


No, if you lower the rate then it looks like this:
AAABBBAAABBBAAABBB

then it's a different kind of wave but that *has* been covered on the
list multiple times already! and it *has* been proven pointless to do
that!

I would give you a link to the exact search results, but since the cgi
is not REST-compatible, that's impossible. But you can just go to:
http://search.retrosynth.com/synth-diy/
and search for

>>dac multiplex

or

>>dac multiplexed

or

>>dac demultiplexer

it's all there.

D.


On Fri, Oct 23, 2009 at 10:43 AM, Ingo Debus <igg.debus at t-online.de> wrote:
>
> Am 22.10.2009 um 23:32 schrieb cheater cheater:
>
>> even if there are only two values multiplexed like this: ABABABABAB
>> then the output will be a sinusoid. This is in movement all the time.
>
> You mean it remains a sine no matter how low the multiplexing rate is? Are
> you sure? I think this would require an adaptive filter of some sorts
> (cutoff goes down with input frequency). Not very desirable for audio...
>
> Or am I missing the point?
>
> Ingo
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> Synth-diy at dropmix.xs4all.nl
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>
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