Alexander Ehlert wrote:
other than exponents of 2. The problem is, that the so called
split radix routines can be really slow. So I'm not actually sure
Split radix isn't slow in itself, in fact it's usually faster that
radix-2/4/8 transforms on architectures with large multilevel caches.
From: Jussi Laako [EMAIL PROTECTED]
I've got lot of stability problems with high order IIR lowpass filters.
Those tend accumulate significant DC offsets over time. OK for short samples
but not for realtime streaming, IMHO.
I were reading about the stuff from Jon Dattorro's paper in
Journal of
From: Alexander Ehlert [EMAIL PROTECTED]
Why 4096 FFT array?? I just use any blocksize. FFTW supports blocksizes
other than exponents of 2. The problem is, that the so called
You would make a good patent lawyer because you would now be able to
grand a patent for any other FFT array length than
From: Alexander Ehlert [EMAIL PROTECTED]
AFAIK almost none uses the sinc interpolation since it is too cpu hungry.
Most softynths work without any filtering otherwise they would not achieve
50-100 voices on a PII/III box.
Yeah, you would a sinc interpolation with folding anyway and for that
Juhana Sadeharju wrote:
OK. I have been quite skeptical to any FFT analysis/synthesis because
the phase vocoder in Csound sounds very muddy even no change is done.
Something's wrong. Overlap? Window shape?
But if you're handling only the complex values got from FFT (not amplitude-
phase
The Csound pvoc has many differences from others, not least in that it
offers time-scaling by means of interpolating between the analysis
frames of the pre-created analysis file. It is not a simple streaming
pvoc the way others are.
I suspect there are other aspects too where the implementation
From: Richard Dobson [EMAIL PROTECTED]
I suspect there are other aspects too where the implementation couyld be
improved. More orthodox pvocs, sucha s the F.R Moore one, and CARL (on
which my 'PVStream' real-time pvoc is based), does offer exact
reconstruction. Because of the interpolation,
Hi Juhana,
sorry with all that gui discussion I totally forgot about this email.
What exactly is the algorithm? Does it do a good job? How have you
tested it?
I just do an n-times oversampling DFT. You can configure blocksize
and oversampling(overlap) factor. Then for the resampling process
Is there any card, that works fine with full duplex 44kHz and small
fragment sizes? Not the Hammerfall, I want something cheaper.
I use a Trident 4D-NX based card from Hoontech that cost about $60,
and it works 100% with 64 frames per interupt.
--p
