| T.R | Title | User | Personal
Name | Date | Lines |
|---|
| 894.1 | Well, *someone* had to say it! | AKOV75::EATOND | Deny thyself | Mon Aug 03 1987 14:11 | 6 |
| RE < Note 894.0 by DSSDEV::HALLGRIMSSON >
-< LA synthesis: what *is* it? >-
I heard rumors about it being something developed out on the west
coast...
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| 894.2 | that was MY line!!!!! | JAWS::COTE | Bad Sneakers and a Pina Colada... | Mon Aug 03 1987 14:17 | 1 |
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| 894.3 | I have a guess. | ACORN::BAILEY | Steph Bailey | Mon Aug 03 1987 18:44 | 29 |
| Right. But in all seriousness. I assume you want a ``what's going
on inside there?'' description.
As far as I can tell, it seems to be an analog programming idiom
placed on top of a heap of digital signal processing stuff. I think
it has the usual wavetable (hence the ability to use preset samples)
and then some DSP hardware which is fast enough to do digital filtering
and scaling. They are just migrating more and more stuff back into
the digital domain, and in the LA case, it's all back there.
In Rolands pianos, they call the synthesis ``structured adaptive''
synthesis, which means that they have a bunch of different wave-forms
and they slide between them (that's the ``adaptive'' part) in a
predetermined way (that's the ``structure'') over time.
I think the Linear Adaptive system would, by inference, also end
up sliding between waves, but it would do it in a purely linear
manner. That is, the pianos might would slide from one wave to
another in a non-linear (eg logrithmic) manner, but the synth can
only do it linearly. Also the control functions which select which
waves to move through could be linear in the synth case and non-linear
in the piano case.
So probably it calculates several waves for various points in time
(with various velocities?) and cruises from there.
That's what it smells like to me.
Steph
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| 894.4 | A pointer | PHUBAR::WELLS | Left of Center | Wed Aug 05 1987 16:26 | 11 |
| The latest issue of Music Technology (Laurie "Keyboards are like
cars" Anderson on the cover) has a general article on wave synthesis,
describing that most of the recent wave of new synthesis techniques
(excluding FM and PD) are really just variations on wavetable
synthesis. They discuss systems like Korg DW, Roland D, Prophet
VS and PPG (maybe others, too), and even mention that Kawai K5's
aren't really quite additive synthesis and have wave synthesis aspects.
An informative and understandable article.
Richard
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| 894.5 | Get this magazine. | DSSDEV::HALLGRIMSSON | For that reason; consequently; hence. | Wed Aug 05 1987 16:37 | 13 |
| re .4: I picked up this issue of Music Technology the other night.
I strongly second the recommendation of this article. It looks
like one of those pointless overviews, but it goes into considerable
(and informative) depth. The writer is apparently the architect
for one of the systems described, (but not plugged!). I found it
quiet refreshing after wading through endless marketing hype in
magazines and dealing with salespeople. "Architecture, what's an
architecture?"
But this article doesn't cover the D-50...
Eirikur
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| 894.6 | Adaptive Arithmetic? | DRUMS::FEHSKENS | | Mon Aug 10 1987 15:37 | 7 |
| By the way, it's "linear arithmetic" rather than "linear adaptive"
synthesis. I think this just means they do a lot of computing rather
than analog signal processing.
len.
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| 894.7 | D-50 | AITG::WELLS | Left of Center | Tue Aug 18 1987 18:43 | 4 |
| Reviewed in latest Keyboard.
Richard
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