[sdiy] Some theoretical discussion...

[cyborgzero at comcast.net]

Er, you must first finish the interocitor and the flux capacitor, both
of which are integral parts of your system.. :)

Actually, MP3s do something very similiar to what you are saying due
to framing: its called pre-ring, which is caused by a fast transient
occuring in the very near future causing an error.

Rob

custom synth parts, tech, etc : www.angelfire.com/il/cyborgzerotech
AIM: cybrgzr0 <--- the last thing is a number

----- Original Message -----
From: "Tom May" <tom at tommay.net>
To: "Studio 271 Productions" <studio271 at mail.ev1.net>
Cc: <synth-diy at dropmix.xs4all.nl>
Sent: Wednesday, September 11, 2002 6:47 PM
Subject: Re: [sdiy] Some theoretical discussion...


> This is reminding me of audio compression algorithms which use a
model
> that outputs what they expect the sound to be like in the near
future,
> presumably based on what it was like in the (near?) past, then send
a
> sequence of correction values to adjust the model to what really
> happened.
>
> Tom.
>
> Studio 271 Productions <studio271 at mail.ev1.net> writes:
>
> > At first I thought this could be considered OT, and it probably
still
> > will be by some, but I hope it inspires people to think about such
a
> > thing or at the very least tell me about something like this that
may
> > already exist.
> >
> > I was waiting for the bus today when a thought struck my
> > content-stricken mind. We have delay effect for sound, but why not
a
> > reverse delay effect; a way of hearing a sound before it actually
> > occurs? That's when I decided to google up some information, and
found
> > a document on natural piano playing envelopes that described
something
> > called "yaled" ("delay" backwards), so I decided to call this
> > theoretical effect this as a way of assigning it a name while I
thoght
> > about it.
> >
> > Delay, in terms of writing styles, would be a nonfiction book
about
> > the past; yaled, OTOH, could either be a nonfiction futuristic
book
> > which derives it's information from premonitions into the future,
such
> > as Nostradamus' writings (this does not necessarily mean it has to
> > come true, though, because it is still just a premonition. Unless
> > someone here believes in predestination...) The other would be a
> > fiction futuristic book (sci-fi?) which derives it's information
from
> > past events, such as George Orwell's "1984". This first option
would
> > most likely be impossible with our current technology and views
about
> > physics (although I remember seeing a physics program which showed
a
> > guy who sent analog audio through a wire and through a empty space
or
> > something and somehow the music got through the space before the
> > wire. At least that's what I think happened; it was a few years
ago
> > after all. Maybe it was just a misunderstood metaphor? ;/ ), but
the
> > second option, the fiction futuristic based on past events seems
> > plausible.
> >
> > It would be a lot like a delay to a listener, maybe even almost
> > identical, but it WOULD be very interesting to hear a frequency
begin
> > to slow down before you have it actually happen. In our state of
> > technology it would basically be a type of "randomizer" which
> > attempted to guess a change in the voltage level before one
actually
> > occurs.
> >
> > It took me a while to come up with a way that one could do this,
but I
> > came up with a logic structure to base it on:
> >
> > x = streamed instantanious sound
> > a = x
> > wait a designated amount of time
> > b = x
> > if a = b,  then c = b
> > if a > b, then c = b(minus an arbitrary unit)
> > if a < b, then c = b(plus an arbitrary unit)
> > output c
> >
> > That seems to represent what I am talking about. However, I would
like
> > some feedback so people can "debug my logic". An analog equivelent
> > would probably involve a BB... er... sorry... tape delay and some
> > comparators.
> >
> > I hope I didn't leave anything out that I thought of earlier,
because
> > I tend to do that. I have written this purely at a theoretical
> > viewpoint to inspire further thinking about "yaled". Just remember
> > that I am NOT talking about traveling into the future, taking a
> > voltage level and outputing it in the present. If that were
possible,
> > I would suspect it to sound very interesting, OTOH.
> >
> > - Drew