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I think it's all the (int) casting
It should be faster with tabw, but you just have
to
watch out because it does not check for
bounds.
Victor
----- Original Message -----
Sent: Tuesday, December 11, 2007 9:02
AM
Subject: [Csnd] Re: Re: Re: dynamic
wavetables, was: phase shaping
Good.
But one more question about rewriting tables,
why is writing so much more expensive (in terms of CPU usage) than
reading ?
best
Oeyvind
2007/12/11, Anthony Kozar <anthonykozar@sbcglobal.net>:
If
you are going to use Chebyshev polynomials (or even
non-Chebyshev
polynomials) then I would guess it will be more efficient
to use the new
opcode chebyshevpoly (or polynomial) that is now in
CVS. Calculating an
entire table every k-pass will compute a
lot of unused values.
I have gotten very smooth results in my tests
of chebyshevpoly so far (once
I realized that a k-rate de-clicking
envelope was introducing
discontinuities). The new opcode
powershape is also quite nice for variable
x^y
waveshaping/distortion.
Anthony Kozar
anthonykozar AT sbcglobal
DOT net
http://anthonykozar.net/
victor
wrote on 12/10/07 6:07 PM:
> Well, that depends, because if the
transfer functions differ
> a lot, then you might get clicks, as the
resulting waveform
> might have a big jump between samples. If
however you are
> using well-behaved polynomials, then the difference
between
> the curves might be smooth enough. Also remember
that
> by just drawing transfer functions it is very easy to get
> non-bandlimited signals. Polynomials are generally your
>
best bet.
>
> Victor
> ----- Original Message
-----
> From: Oeyvind Brandtsegg
> To: Csound mailing list
address
> Sent: Monday, December 10, 2007 10:19 PM
> Subject:
[Csnd] dynamic wavetables, was: phase shaping
>
>
> All
this talk about phase shaping and rewriting tables got me thinking.
>
Is there something hindering us from algorithmically rewriting wavetables on
> the fly ?
> I figure, if the rewriting is happening at the
exact same rate as the table
> reading, we would not get unwanted
clicks or discontinuities.
> Or ?
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