Band-Limited Overlapping Oscillator
DSP, Plugin and Host development discussion.
Moderator: KVR Moderators (Main)
Band-Limited Overlapping Oscillator
2008-12-13T15:48:20+00:00
Hi,
in the following article an algorithm is presented which acts on
an abstract slave oscillator object with a (phase) reset function
(or, in a more generic context, any initializable, causal signal),
offering deterministic aliasing attenuation of the inharmonic partials
present in the oscillator's output based solely on the
interpolator design plus a representation of fractionally long
periods leading to smooth transitions between successive,
integer periods. A fortunate implication, amongst others,
is the deterministic and bounded aliasing attenuation of
arbitrary-waveform hard-sync (or in another, common to
the literature, context, attenuation is independent on
the C_n continuity of the slave signal). More details
in the article:
http://www.sendspace.com/file/opfusm
Included is matlab code demonstrating the facts outlined
by the article through an example on a sine slave oscillator
hard-sync because of it's C_infinity discontinuity.
Additionally, a per-sample, object-oriented realization
in pseudo-C++ is provided in the article.
This is the product of personal, independent research and
proofreading was done briefly on IRC (many thanks
to Antti Huovilainen and Andrew Simper for that).
So, any feedback would be needed and _highly_
appreciated!
Thanks in advance!
PS: It would be also highly appreciated if some consistent
webspace was offered for the article.
gasm
https://www.kvraudio.com/forum/memberlist.php?mode=viewprofile&u=9707
-
- KVRer
- Topic Starter
- 9 posts since 15 Oct, 2003 from Berlin, Germany
- Contact:
Just to note one more thing that might be not obvious at first glance: in the example above the hard-sync case for the sine is not a necessity to get acceptable results. This means that if master and slave have the same frequency then again the inharmonic components will be attenuated by what the master (BLIT) interpolator suggests resulting in kindof "cleaning" the crappy oscillator from inharmonic components. So it is actually like a harmonic wrapper for any signal generator, something that the pseudo-C++ code in the article was hoping to demonstrate in an almost ready to use way.
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