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Re: [200e] Re: 261e or 259e capable of higher frequencies?

2008-09-29 by ezra buchla

>> 261e's fundamental frequency is set to the top of its range, it can
>> still generate harmonics above the fundamental.
>>
>
> Via the waveshaper, yeah? If I had one beef with the 259e/261e it would be
> the FM in the
> higher frequency range. Set the fundamental to 6000 hz and fm it, the output
> will clip at
> 7040, therefore limiting the rich sidebands you might be used to on "other"
> synths.

that's just not true. there is no frequency domain "clipping" at 7k.
the 261e primary osc only produces fundamentals up to a certain
frequency (its not actually 7040 despite the silkscreen; try
listening); this is indeed due to processor limitations; of course we
actually have to compute the waveform thousands of times faster than
the fundamental in order to produce a clean sinewave input to the
waveshaper. we could produce faster fundamentals but they would begin
life with artifacts even before waveshaping, and you would not like
that (or maybe you would...?)

anyway, the waveform is actually being computed at 50k or 100k or
something, so pitch modulation will still produce high-frequency
sidebands. use the internal pitch modulation to avoid jitter. i'm
sorry abuot the external FM inputl; it's not useful for high frequency
stuff.... sorry sorry. personally i'm used to being able to process
arbitrary signals with FM, but i find that the 291e scratches this
itch.

and yes, of course, of course, everything after the 261e sinewave is
analog, and the harmonic content added by waveshaping proceeds towards
the infinite for as far as you might care to take your analysis....

-eb

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